Pub Date : 2023-09-01DOI: 10.1088/2058-8585/acf943
Long Yang, Ming Chen, Taizheng Wu, Liang Niu, Liang Zeng, Guang Feng
Abstract The optimization of electrochemical energy storage devices (EES) for low-temperature conditions is crucial in light of the growing demand for convenient living in such environments. Sluggish ion transport or the freezing of electrolytes at the electrode-electrolyte interface are the primary factors that limit the performance of EES under low temperatures, leading to fading of capacity and instability in device performance. This review provides a comprehensive overview of antifreeze strategies for various electrolytes (including aqueous electrolytes, organic electrolytes, and ionic liquids), and optimization methods for ion transport at the electrolyte-electrode. Additionally, the main challenges and forward-looking views are highlighted on the design and development of low-temperature electrolytes and EES devices.
{"title":"Low-temperature electrolytes for electrochemical energy storage devices: bulk and interfacial properties","authors":"Long Yang, Ming Chen, Taizheng Wu, Liang Niu, Liang Zeng, Guang Feng","doi":"10.1088/2058-8585/acf943","DOIUrl":"https://doi.org/10.1088/2058-8585/acf943","url":null,"abstract":"Abstract The optimization of electrochemical energy storage devices (EES) for low-temperature conditions is crucial in light of the growing demand for convenient living in such environments. Sluggish ion transport or the freezing of electrolytes at the electrode-electrolyte interface are the primary factors that limit the performance of EES under low temperatures, leading to fading of capacity and instability in device performance. This review provides a comprehensive overview of antifreeze strategies for various electrolytes (including aqueous electrolytes, organic electrolytes, and ionic liquids), and optimization methods for ion transport at the electrolyte-electrode. Additionally, the main challenges and forward-looking views are highlighted on the design and development of low-temperature electrolytes and EES devices.","PeriodicalId":51335,"journal":{"name":"Flexible and Printed Electronics","volume":"2012 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134962228","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-01DOI: 10.1088/2058-8585/acf774
Sedat Kurnaz, Ozgür Ozturk, Ali Hazar Mehmet, Utku Guduloglu, Nurdane Yilmaz, Osman Cicek
Abstract The use of polymers to fabricate flexible pressure sensors as an alternative to conventional pressure sensors has led to the development of physiological monitoring of human body and the electronic skin. In particular, the fabrication of flexible capacitive and piezoresistive sensors using a variety of materials and the investigation of their electromechanical properties are further developments in these fields. Herein, parylene C is synthesized via chemical vapor deposition method. Pressure-sensitive inks are prepared with a composite of parylene C, polyurethane, polymethylmethacrylate, and activated carbon at certain weight ratios. Flexible capacitive and piezoresistive pressure sensors are fabricated by the screen printing method. The sensitivity, detection limit, linearity range, and response/relaxation time, which define the capacitive and piezoresistive properties are investigated and presented in this paper. The sensitivities of the flexible capacitive and piezoresistive pressure sensors are 0.124 kPa −1 and 0.074 kPa −1 in the pressure range of 0.07–1.39 kPa. This study enables parylene C to be used in the composite structure and shows that it can be used not only as a protective layer but also in flexible pressure sensor applications. It also ensures that the design of the flexible capacitance pressure sensor can measure low pressure with high sensitivity compared to the flexible piezoresistive pressure sensor.
{"title":"Flexible capacitive and piezoresistive pressure sensors based on screen-printed parylene C/polyurethane composites in low-pressure range","authors":"Sedat Kurnaz, Ozgür Ozturk, Ali Hazar Mehmet, Utku Guduloglu, Nurdane Yilmaz, Osman Cicek","doi":"10.1088/2058-8585/acf774","DOIUrl":"https://doi.org/10.1088/2058-8585/acf774","url":null,"abstract":"Abstract The use of polymers to fabricate flexible pressure sensors as an alternative to conventional pressure sensors has led to the development of physiological monitoring of human body and the electronic skin. In particular, the fabrication of flexible capacitive and piezoresistive sensors using a variety of materials and the investigation of their electromechanical properties are further developments in these fields. Herein, parylene C is synthesized via chemical vapor deposition method. Pressure-sensitive inks are prepared with a composite of parylene C, polyurethane, polymethylmethacrylate, and activated carbon at certain weight ratios. Flexible capacitive and piezoresistive pressure sensors are fabricated by the screen printing method. The sensitivity, detection limit, linearity range, and response/relaxation time, which define the capacitive and piezoresistive properties are investigated and presented in this paper. The sensitivities of the flexible capacitive and piezoresistive pressure sensors are 0.124 kPa −1 and 0.074 kPa −1 in the pressure range of 0.07–1.39 kPa. This study enables parylene C to be used in the composite structure and shows that it can be used not only as a protective layer but also in flexible pressure sensor applications. It also ensures that the design of the flexible capacitance pressure sensor can measure low pressure with high sensitivity compared to the flexible piezoresistive pressure sensor.","PeriodicalId":51335,"journal":{"name":"Flexible and Printed Electronics","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135346820","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-01DOI: 10.1088/2058-8585/acf8d5
Anthony Ubah, Nima Zakeri, Marta Cerruti, Thomas Szkopek
Abstract Graphene oxide (GO) is an oxidized derivative of graphene that can be formed into free-standing wafers by aqueous processing methods. We propose GO as a potential alternative printed electronic substrate material to mitigate the waste electronic and electrical equipment problem. By dissolving these substrates in water, GO permits the mechanical separation and recovery of discrete components from defunct circuits, thus closing the life cycle of printed circuits. In this work we measure the anisotropic, frequency dependent resistivity of free-standing GO wafers under DC and AC ( f = 0.1 Hz–500 kHz) excitation and in varying relative humidity (RH) conditions. Unmodified GO and GO crosslinked with calcium ions, borate ions, and glutaraldehyde were characterized. AC resistivity measurements reveal charge transport in free-standing GO occurs by several distinct hopping conduction mechanisms that are sensitive to the crosslinking formulation. GO crosslinked with calcium ions exhibits the highest DC resistivity, 4.6 × 10 5 Ωm and 2.6 × 10 4 Ωm, for out-of-plane and in-plane directions, respectively, at 17% RH. Both AC and DC resistivities decrease with increasing RH. We demonstrate that GO wafers can be used as dielectric substrates in the construction of simple electronic circuits with discrete electronic components. Finally, we present a proof-of-concept for electrical trace and component recovery via disassembly of GO wafers in water.
{"title":"High resistivity free-standing crosslinked graphene oxide substrates: hopping conduction mechanism and application to recyclable electronics","authors":"Anthony Ubah, Nima Zakeri, Marta Cerruti, Thomas Szkopek","doi":"10.1088/2058-8585/acf8d5","DOIUrl":"https://doi.org/10.1088/2058-8585/acf8d5","url":null,"abstract":"Abstract Graphene oxide (GO) is an oxidized derivative of graphene that can be formed into free-standing wafers by aqueous processing methods. We propose GO as a potential alternative printed electronic substrate material to mitigate the waste electronic and electrical equipment problem. By dissolving these substrates in water, GO permits the mechanical separation and recovery of discrete components from defunct circuits, thus closing the life cycle of printed circuits. In this work we measure the anisotropic, frequency dependent resistivity of free-standing GO wafers under DC and AC ( f = 0.1 Hz–500 kHz) excitation and in varying relative humidity (RH) conditions. Unmodified GO and GO crosslinked with calcium ions, borate ions, and glutaraldehyde were characterized. AC resistivity measurements reveal charge transport in free-standing GO occurs by several distinct hopping conduction mechanisms that are sensitive to the crosslinking formulation. GO crosslinked with calcium ions exhibits the highest DC resistivity, 4.6 × 10 5 Ωm and 2.6 × 10 4 Ωm, for out-of-plane and in-plane directions, respectively, at 17% RH. Both AC and DC resistivities decrease with increasing RH. We demonstrate that GO wafers can be used as dielectric substrates in the construction of simple electronic circuits with discrete electronic components. Finally, we present a proof-of-concept for electrical trace and component recovery via disassembly of GO wafers in water.","PeriodicalId":51335,"journal":{"name":"Flexible and Printed Electronics","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135255225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-01DOI: 10.1088/2058-8585/acfb1e
Fangmiao Song, Mengyuan Zhou, Wei Sun, Yan Qiao, Zhisong Lu
Abstract The regenerated silk fibroin (RSF) film has been regarded as an ideal substrate for biocompatible, flexible, and biodegradable electronic skin (e-skin) devices. However, it is still a great challenge to balance the flexibility and solubility of the RSF film by adjusting its secondary structure. Herein, a film prepared with the hydrolyzed RSF was exposed to the 254 nm ultraviolet (UV) light to prepare a crosslinked and partially water-insoluble substrate for a strain-sensing e-skin. The hydrolyzed low-molecular-weight RSF was produced by heating the LiBr-silk fibroin solution at 85 °C for a certain duration. The film cast with the hydrolyzed RSF solution could be thoroughly dissolved in water rapidly. The UV irradiation could induce the crosslinking of the low-molecular-weight RSF to form insoluble substances, thus producing a partially insoluble RSF film. After silver nanowires painting, an e-skin strain sensor was successfully constructed based on the UV-irradiated film. The sensor shows a fast response time (2.01 s), high sensitivity (GF = 1.03 within 0%–40% strain range), and good stability. The device could be tightly attached to human skin with a drop of water. The finger, wrist, elbow, and knee bending could be sensitively detected in real-time. The head nodding and mouth opening could also be sensed by sticking the e-skin at the neck and cheek, respectively. This work may provide a facile way to prepare a stretchable and stickable RSF film, which could serve as an ideal substrate of low-cost, biodegradable, direct-to-skin sensors for wearable applications.
{"title":"Partially insoluble regenerated silk fibroin film induced by UV irradiation for electronic skins","authors":"Fangmiao Song, Mengyuan Zhou, Wei Sun, Yan Qiao, Zhisong Lu","doi":"10.1088/2058-8585/acfb1e","DOIUrl":"https://doi.org/10.1088/2058-8585/acfb1e","url":null,"abstract":"Abstract The regenerated silk fibroin (RSF) film has been regarded as an ideal substrate for biocompatible, flexible, and biodegradable electronic skin (e-skin) devices. However, it is still a great challenge to balance the flexibility and solubility of the RSF film by adjusting its secondary structure. Herein, a film prepared with the hydrolyzed RSF was exposed to the 254 nm ultraviolet (UV) light to prepare a crosslinked and partially water-insoluble substrate for a strain-sensing e-skin. The hydrolyzed low-molecular-weight RSF was produced by heating the LiBr-silk fibroin solution at 85 °C for a certain duration. The film cast with the hydrolyzed RSF solution could be thoroughly dissolved in water rapidly. The UV irradiation could induce the crosslinking of the low-molecular-weight RSF to form insoluble substances, thus producing a partially insoluble RSF film. After silver nanowires painting, an e-skin strain sensor was successfully constructed based on the UV-irradiated film. The sensor shows a fast response time (2.01 s), high sensitivity (GF = 1.03 within 0%–40% strain range), and good stability. The device could be tightly attached to human skin with a drop of water. The finger, wrist, elbow, and knee bending could be sensitively detected in real-time. The head nodding and mouth opening could also be sensed by sticking the e-skin at the neck and cheek, respectively. This work may provide a facile way to prepare a stretchable and stickable RSF film, which could serve as an ideal substrate of low-cost, biodegradable, direct-to-skin sensors for wearable applications.","PeriodicalId":51335,"journal":{"name":"Flexible and Printed Electronics","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135387958","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-30DOI: 10.1088/2058-8585/acf508
Liming Xie, Wenming Su
Quantum dot light-emitting diodes (QLEDs) have attracted a great deal of interests due to their unique advantages such as tunable spectrum, high color saturation, compatibility with low-cost inkjet-printing (IJP) technology and potential for use in large-area full-color pixelated display. To date, the efficiency and lifetime of red, green, and blue QLEDs have been significantly improved, in which hole-transporting materials (HTMs) play the key role in determining the device performance. In this review, we highlight to summarize the diverse types of HTMs in QLEDs, including small-organic materials, polymers, crosslinkable materials and inorganic p-type semiconductors, and their properties such as charge carrier mobility, thermal stability, and structural configuration are also reviewed. The significant effects of these properties on device performances are discussed, which would help to understand device physics and improve their performances and reliability of QLEDs. In addition, the development of IJP for QLEDs fabrication and the influence factors of IJP on quantum dot film-forming property are also reviewed, in an effort to provide guidance to continue the advancement of QLED displays.
{"title":"Recent progress in hole-transporting materials and inkjet-printing QLEDs","authors":"Liming Xie, Wenming Su","doi":"10.1088/2058-8585/acf508","DOIUrl":"https://doi.org/10.1088/2058-8585/acf508","url":null,"abstract":"Quantum dot light-emitting diodes (QLEDs) have attracted a great deal of interests due to their unique advantages such as tunable spectrum, high color saturation, compatibility with low-cost inkjet-printing (IJP) technology and potential for use in large-area full-color pixelated display. To date, the efficiency and lifetime of red, green, and blue QLEDs have been significantly improved, in which hole-transporting materials (HTMs) play the key role in determining the device performance. In this review, we highlight to summarize the diverse types of HTMs in QLEDs, including small-organic materials, polymers, crosslinkable materials and inorganic p-type semiconductors, and their properties such as charge carrier mobility, thermal stability, and structural configuration are also reviewed. The significant effects of these properties on device performances are discussed, which would help to understand device physics and improve their performances and reliability of QLEDs. In addition, the development of IJP for QLEDs fabrication and the influence factors of IJP on quantum dot film-forming property are also reviewed, in an effort to provide guidance to continue the advancement of QLED displays.","PeriodicalId":51335,"journal":{"name":"Flexible and Printed Electronics","volume":" ","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46156270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-23DOI: 10.1088/2058-8585/acf326
Sichao Ji, Guohua Xie, Qin Xue
Multi-resonance (MR) materials have attracted considerable attention owing to their ability to achieve high color purity emissions with the small full-width at half-maxima (FWHMs) in organic light-emitting diodes (OLEDs), which is crucial for wide color-gamut displays. Nowadays, MR emitters covering almost full color have been developed and applied to construct high-performance narrowband OLEDs. From the commercial perspective of device fabrication, compared with the vacuum-deposition technique, solution processes provide the more economical approaches for the production of low-cost and large-area OLED display panels. Since the device performances of solution-processed MR-OLEDs still lag behind those of vacuum-deposited devices, developing MR emitters featuring intrinsically narrow FWHMs, fast reverse intersystem crossing rate, and good solubility are urgently needed in future cost-effective ultrahigh-definition displays. In this focus review, we summarize the recent advances in solution-processable MR-type emitters, especially for the thermally activated delayed fluorescence molecules. Molecular design, photophysical properties, and solution-processed device performances are correlated. Additionally, the challenges in solution-processed MR-OLEDs and the promising applications of efficient solution-processable MR emitters are also envisaged.
{"title":"Solution-processed multi-resonance emitters for ultimate displays","authors":"Sichao Ji, Guohua Xie, Qin Xue","doi":"10.1088/2058-8585/acf326","DOIUrl":"https://doi.org/10.1088/2058-8585/acf326","url":null,"abstract":"Multi-resonance (MR) materials have attracted considerable attention owing to their ability to achieve high color purity emissions with the small full-width at half-maxima (FWHMs) in organic light-emitting diodes (OLEDs), which is crucial for wide color-gamut displays. Nowadays, MR emitters covering almost full color have been developed and applied to construct high-performance narrowband OLEDs. From the commercial perspective of device fabrication, compared with the vacuum-deposition technique, solution processes provide the more economical approaches for the production of low-cost and large-area OLED display panels. Since the device performances of solution-processed MR-OLEDs still lag behind those of vacuum-deposited devices, developing MR emitters featuring intrinsically narrow FWHMs, fast reverse intersystem crossing rate, and good solubility are urgently needed in future cost-effective ultrahigh-definition displays. In this focus review, we summarize the recent advances in solution-processable MR-type emitters, especially for the thermally activated delayed fluorescence molecules. Molecular design, photophysical properties, and solution-processed device performances are correlated. Additionally, the challenges in solution-processed MR-OLEDs and the promising applications of efficient solution-processable MR emitters are also envisaged.","PeriodicalId":51335,"journal":{"name":"Flexible and Printed Electronics","volume":" ","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46479195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-17DOI: 10.1088/2058-8585/acf143
Junaid Khan, M. Mariatti
The development of eco-friendly alkali lignin-assisted water-based stable graphene oxide (GO) ink presents an innovative approach with the potential to revolutionize the manufacturing of printed and flexible electronics through scalable inkjet printing. However, GO lacks conductivity, necessitating an additional reduction step to restore its electrical properties. Traditional reduction methods using toxic agents or high temperatures are not suitable for large-scale manufacturing due to environmental hazards. In-situ reduction techniques using natural substances offer a promising, cost-effective, and continuous solution for precise reduction of GO-printed patterns via inkjet printing. However, limited research has been conducted on natural-based inkjet printable reducing inks. In this work, in-situ inkjet printable natural reducing inks were produced and printed on top of GO-printed patterns to carry out the reduction process. The reduced printed patterns were investigated for structural, functional groups, morphology, and electrical resistance. The ascorbic acid reduced sample showed an increase in the I D/I G ratio from 1.058 to 1.15, and the interlayer distance decreased from 0.395 to 0.385 nm. The atomic force microscope surface analysis showed a significant increase in the mean roughness by three times for the ascorbic acid-reduced sample, indicating success in the reduction process. The ascorbic acid reduced patterns also showed an electrical conductivity of 1250 S m−1 compared to 0.43 S m−1 for unreduced GO printed patterns, indicating restoration of the sp2 hybridised conductive networks.
生态友好型碱木质素辅助水基稳定氧化石墨烯(GO)墨水的开发提出了一种创新的方法，有可能通过可扩展的喷墨打印彻底改变印刷和柔性电子产品的制造。然而，氧化石墨烯缺乏导电性，需要额外的还原步骤来恢复其电性能。传统的使用有毒药剂或高温还原的方法由于环境危害而不适合大规模生产。使用天然物质的原位还原技术为通过喷墨打印精确还原氧化石墨烯印刷图案提供了一种有前途的、具有成本效益的、连续的解决方案。然而，对天然基喷墨可打印还原油墨的研究还很有限。在这项工作中，生产了原位喷墨可打印的天然还原油墨，并将其印刷在go印刷图案上，以进行还原过程。研究了减少的印刷图案的结构、官能团、形态和电阻。抗坏血酸还原样品的I - D/I - G比值从1.058增加到1.15，层间距离从0.395减小到0.385 nm。原子力显微镜表面分析表明，抗坏血酸还原样品的平均粗糙度显着增加了三倍，表明还原过程成功。抗坏血酸还原后的氧化石墨烯印刷图案的电导率为1250 S m−1，而未还原的氧化石墨烯印刷图案的电导率为0.43 S m−1，表明sp2杂化导电网络的恢复。
{"title":"In-situ graphene oxide reduction via inkjet printing using natural reducing inks","authors":"Junaid Khan, M. Mariatti","doi":"10.1088/2058-8585/acf143","DOIUrl":"https://doi.org/10.1088/2058-8585/acf143","url":null,"abstract":"The development of eco-friendly alkali lignin-assisted water-based stable graphene oxide (GO) ink presents an innovative approach with the potential to revolutionize the manufacturing of printed and flexible electronics through scalable inkjet printing. However, GO lacks conductivity, necessitating an additional reduction step to restore its electrical properties. Traditional reduction methods using toxic agents or high temperatures are not suitable for large-scale manufacturing due to environmental hazards. In-situ reduction techniques using natural substances offer a promising, cost-effective, and continuous solution for precise reduction of GO-printed patterns via inkjet printing. However, limited research has been conducted on natural-based inkjet printable reducing inks. In this work, in-situ inkjet printable natural reducing inks were produced and printed on top of GO-printed patterns to carry out the reduction process. The reduced printed patterns were investigated for structural, functional groups, morphology, and electrical resistance. The ascorbic acid reduced sample showed an increase in the I D/I G ratio from 1.058 to 1.15, and the interlayer distance decreased from 0.395 to 0.385 nm. The atomic force microscope surface analysis showed a significant increase in the mean roughness by three times for the ascorbic acid-reduced sample, indicating success in the reduction process. The ascorbic acid reduced patterns also showed an electrical conductivity of 1250 S m−1 compared to 0.43 S m−1 for unreduced GO printed patterns, indicating restoration of the sp2 hybridised conductive networks.","PeriodicalId":51335,"journal":{"name":"Flexible and Printed Electronics","volume":" ","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41997249","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-17DOI: 10.1088/2058-8585/acf142
João Henrique Ferreira da Conceição, Mikaël Party, D. Curtil, Lenka Svecova, Nathalie Marlin, Nadège Reverdy-Bruas
The continued progress in electronics technology has led to unsustainable consumption of plastic-based products containing, in their majority, natural finite metallic resources. The substitution of these plastic materials by more sustainable ones, such as cellulosic substrates, is one of many measures applied by the industry to reduce their environmental impact. In this work, due to the lack of information in the literature, a fast and accurate method to measure the amount of metal deposited onto a paper-based substrate is proposed. The development of this method will contribute to the creation of a procedure for determining the quantity of metal present in end-of-life printed electronics. The present work investigates and compares four different methodologies. Image processing and geometrical analyses presented overestimated and non-precise results for printed Ag. A third method based on gravimetric measurements presented to be more accurate compared with the previous methods. The last method based on acid leaching of the printed electronic ashes outcome to be the more precise, reliable and simpler method, and overcomes challenges associated to the printed pattern geometry and the materials used during its production. These results will provide key information for the development of a quantitative methodology to determine the percentage of Ag used in paper-based electronics that can be adapted easily by the industry. Furthermore, this method is a prerequisite for recycling processes devoted to this type of electronics after reaching their end-of-life, considering Ag as one of the major components to be separated and, further, valorized.
{"title":"Investigation of methods to quantify silver screen-printed onto cellulosic substrate: towards recycling of printed electronics","authors":"João Henrique Ferreira da Conceição, Mikaël Party, D. Curtil, Lenka Svecova, Nathalie Marlin, Nadège Reverdy-Bruas","doi":"10.1088/2058-8585/acf142","DOIUrl":"https://doi.org/10.1088/2058-8585/acf142","url":null,"abstract":"The continued progress in electronics technology has led to unsustainable consumption of plastic-based products containing, in their majority, natural finite metallic resources. The substitution of these plastic materials by more sustainable ones, such as cellulosic substrates, is one of many measures applied by the industry to reduce their environmental impact. In this work, due to the lack of information in the literature, a fast and accurate method to measure the amount of metal deposited onto a paper-based substrate is proposed. The development of this method will contribute to the creation of a procedure for determining the quantity of metal present in end-of-life printed electronics. The present work investigates and compares four different methodologies. Image processing and geometrical analyses presented overestimated and non-precise results for printed Ag. A third method based on gravimetric measurements presented to be more accurate compared with the previous methods. The last method based on acid leaching of the printed electronic ashes outcome to be the more precise, reliable and simpler method, and overcomes challenges associated to the printed pattern geometry and the materials used during its production. These results will provide key information for the development of a quantitative methodology to determine the percentage of Ag used in paper-based electronics that can be adapted easily by the industry. Furthermore, this method is a prerequisite for recycling processes devoted to this type of electronics after reaching their end-of-life, considering Ag as one of the major components to be separated and, further, valorized.","PeriodicalId":51335,"journal":{"name":"Flexible and Printed Electronics","volume":" ","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47724106","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-11DOI: 10.1088/2058-8585/acef39
S. Vasquez, M. C. Costa Angeli, M. Petrelli, Mukhtar Ahmad, Bajramshahe Shkodra, Barbara Salonikidou, R. Sporea, A. Rivadeneyra, P. Lugli, L. Petti
Even though a plethora of printing technologies are currently available and their potential for the fabrication of low-cost and flexible sensors has been widely investigated, systematically based, and statistically sustained comparative studies are missing in the literature. In this work, we compare screen, inkjet, and dispense printing for the fabrication of carbon nanotube (CNT)-based ammonia (NH3) chemiresistive flexible gas sensors for the first time. Moreover, we report the first CNT-based gas sensor fabricated via Voltera printer. The devices were made of a thin layer of spray-coated CNTs and printed silver-based interdigitated electrodes. To draw a thoughtful comparison the same sensor layout, materials, and fabrication flow were used. The device morphological features were acquired through microscopic, atomic force microscope, and 3D images; additionally, the response to NH3 as well as the printing process characteristics for each technique was analyzed. From 300 µm nominal spacing between lines, we obtained a decrease of 25%, 13%, and 5% on the printed spacings with dispense, screen, and inkjet printing, respectively. At 100 ppm of NH3, a maximum response of 33%, 31%, and 27% with the dispense-, inkjet-, and screen-printed sensors were found, respectively. Statistical differences were observed between the mean values on the NH3 response of dispense- compared to the inkjet- and screen-printed sensors, which in effect showed the highest response in the Tukey test. This demonstrated that the fabrication technique employed can induce a different response mainly driven by the printed outcomes. Following a holistic approach that includes the sensor response, the application, the market perspective, and the process versatility, we suggest screen printing as the most suitable method for CNT-based NH3 gas sensor fabrication.
{"title":"Comparison of printing techniques for the fabrication of flexible carbon nanotube-based ammonia chemiresistive gas sensors","authors":"S. Vasquez, M. C. Costa Angeli, M. Petrelli, Mukhtar Ahmad, Bajramshahe Shkodra, Barbara Salonikidou, R. Sporea, A. Rivadeneyra, P. Lugli, L. Petti","doi":"10.1088/2058-8585/acef39","DOIUrl":"https://doi.org/10.1088/2058-8585/acef39","url":null,"abstract":"Even though a plethora of printing technologies are currently available and their potential for the fabrication of low-cost and flexible sensors has been widely investigated, systematically based, and statistically sustained comparative studies are missing in the literature. In this work, we compare screen, inkjet, and dispense printing for the fabrication of carbon nanotube (CNT)-based ammonia (NH3) chemiresistive flexible gas sensors for the first time. Moreover, we report the first CNT-based gas sensor fabricated via Voltera printer. The devices were made of a thin layer of spray-coated CNTs and printed silver-based interdigitated electrodes. To draw a thoughtful comparison the same sensor layout, materials, and fabrication flow were used. The device morphological features were acquired through microscopic, atomic force microscope, and 3D images; additionally, the response to NH3 as well as the printing process characteristics for each technique was analyzed. From 300 µm nominal spacing between lines, we obtained a decrease of 25%, 13%, and 5% on the printed spacings with dispense, screen, and inkjet printing, respectively. At 100 ppm of NH3, a maximum response of 33%, 31%, and 27% with the dispense-, inkjet-, and screen-printed sensors were found, respectively. Statistical differences were observed between the mean values on the NH3 response of dispense- compared to the inkjet- and screen-printed sensors, which in effect showed the highest response in the Tukey test. This demonstrated that the fabrication technique employed can induce a different response mainly driven by the printed outcomes. Following a holistic approach that includes the sensor response, the application, the market perspective, and the process versatility, we suggest screen printing as the most suitable method for CNT-based NH3 gas sensor fabrication.","PeriodicalId":51335,"journal":{"name":"Flexible and Printed Electronics","volume":" ","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47291615","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-09DOI: 10.1088/2058-8585/acee94
Seongju Kim, Raphaël Wenger, Olivier Bürgy, G. Balestra, Unyong Jeong, Sungjune Jung
Inkjet printing offers significant potential for additive manufacturing technology. However, predicting jetting behavior is challenging because the rheological properties of functional inks commonly used in the industry are overlooked in printability maps that rely on the Ohnesorge and Weber numbers. We present a machine learning-based predictive model for jetting behavior that incorporates the Deborah number, the Ohnesorge number, and the waveform parameters. Ten viscoelastic inks have been prepared and their storage modulus and loss modulus measured, showing good agreement with those obtained by the theoretical Maxwell model. With the relaxation time of the viscoelastic ink obtained by analyzing the Maxwell model equations, the Deborah number could be calculated. We collected a large data set of jetting behaviors of each ink with various waveforms using drop watching system. Three distinct machine learning models were employed to build predictive models. After comparing the prediction accuracy of the machine learning models, we found that multilayer perceptron showed outstanding prediction accuracy. The final predictive model exhibited remarkable accuracy for an unknown ink based on waveform parameters, and the correlation between jetting behavior and ink properties was reasonable. Finally, we developed a printability map characterized by the Ohnesorge and Deborah numbers through the proposed predictive model for viscoelastic fluids and the chosen industrial printhead.
{"title":"Predicting inkjet jetting behavior for viscoelastic inks using machine learning","authors":"Seongju Kim, Raphaël Wenger, Olivier Bürgy, G. Balestra, Unyong Jeong, Sungjune Jung","doi":"10.1088/2058-8585/acee94","DOIUrl":"https://doi.org/10.1088/2058-8585/acee94","url":null,"abstract":"Inkjet printing offers significant potential for additive manufacturing technology. However, predicting jetting behavior is challenging because the rheological properties of functional inks commonly used in the industry are overlooked in printability maps that rely on the Ohnesorge and Weber numbers. We present a machine learning-based predictive model for jetting behavior that incorporates the Deborah number, the Ohnesorge number, and the waveform parameters. Ten viscoelastic inks have been prepared and their storage modulus and loss modulus measured, showing good agreement with those obtained by the theoretical Maxwell model. With the relaxation time of the viscoelastic ink obtained by analyzing the Maxwell model equations, the Deborah number could be calculated. We collected a large data set of jetting behaviors of each ink with various waveforms using drop watching system. Three distinct machine learning models were employed to build predictive models. After comparing the prediction accuracy of the machine learning models, we found that multilayer perceptron showed outstanding prediction accuracy. The final predictive model exhibited remarkable accuracy for an unknown ink based on waveform parameters, and the correlation between jetting behavior and ink properties was reasonable. Finally, we developed a printability map characterized by the Ohnesorge and Deborah numbers through the proposed predictive model for viscoelastic fluids and the chosen industrial printhead.","PeriodicalId":51335,"journal":{"name":"Flexible and Printed Electronics","volume":" ","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48892910","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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