Pub Date : 2020-08-16DOI: 10.1109/FLEPS49123.2020.9239526
G. B. Tseghai, B. Malengier, Kinde Anlay Fante, A. B. Nigusse, Bulcha Belay Etana, L. Van Langenhove
For electrocardiography (ECG) applications, gel dependant metallic electrodes such as Ag/AgCl are typically used, but these cause skin irritation and become dehydrated over time. To overcome these problems, a flexible electro-conductive textile material with a surface resistance of 332.5 Ω/sq and resistivity of 6.6 Ω.cm has been developed by coating PEDOT:PSS/PDMS on cotton fabric via flat screen printing. The coated fabric has been used to construct ECG electrodes and was compared with standard Ag/AgCl electrodes. An ECG waveform (with peaks P = 0.14 mV, QRS = 0.96 mV and T = 0.36 mV) has been collected with the textile-based electrodes during 3 minutes of static ECG measurement. The signal quality was comparable with the Ag/AgCl standard electrodes (P = 0.15 mV, QRS = 0.98 mV and T = 0.48 mV). The textile-based dry electrodes could potentially replace the gelled standard biopotential electrodes and avoid associated problems, especially for prolonged monitoring.
{"title":"PEDOT:PSS/PDMS-coated cotton fabric for ECG electrode","authors":"G. B. Tseghai, B. Malengier, Kinde Anlay Fante, A. B. Nigusse, Bulcha Belay Etana, L. Van Langenhove","doi":"10.1109/FLEPS49123.2020.9239526","DOIUrl":"https://doi.org/10.1109/FLEPS49123.2020.9239526","url":null,"abstract":"For electrocardiography (ECG) applications, gel dependant metallic electrodes such as Ag/AgCl are typically used, but these cause skin irritation and become dehydrated over time. To overcome these problems, a flexible electro-conductive textile material with a surface resistance of 332.5 Ω/sq and resistivity of 6.6 Ω.cm has been developed by coating PEDOT:PSS/PDMS on cotton fabric via flat screen printing. The coated fabric has been used to construct ECG electrodes and was compared with standard Ag/AgCl electrodes. An ECG waveform (with peaks P = 0.14 mV, QRS = 0.96 mV and T = 0.36 mV) has been collected with the textile-based electrodes during 3 minutes of static ECG measurement. The signal quality was comparable with the Ag/AgCl standard electrodes (P = 0.15 mV, QRS = 0.98 mV and T = 0.48 mV). The textile-based dry electrodes could potentially replace the gelled standard biopotential electrodes and avoid associated problems, especially for prolonged monitoring.","PeriodicalId":101496,"journal":{"name":"2020 IEEE International Conference on Flexible and Printable Sensors and Systems (FLEPS)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129460399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-08-16DOI: 10.1109/FLEPS49123.2020.9239569
M. V. Nikolić, Z. Vasiljevic, M. Dojcinovic, N. Tadic, M. Radovanović, G. Stojanović
Nanocrystalline nickel manganite (NiMn $_{2} O_{4}$) was obtained by sol-gel combustion using glycine as fuel, followed by calcination at 800°C. X-ray diffraction (XRD) analysis confirmed the formation of a pure cubic spinel structure with a crystallite size of 54.5 nm. Scanning electron microscopy (SEM) of the obtained nickel manganite powder showed porous nanocrystalline morphology. The material constant (B) of the obtained nickel manganite powder applied as paste and dried at 100°C was determined as 4812 K in the temperature range 20-50°C, confirming potential application in flexible temperature sensors.
{"title":"Nanocrystalline Nickel Manganite Synthesis by Sol-Gel Combustion for Flexible Temperature Sensors","authors":"M. V. Nikolić, Z. Vasiljevic, M. Dojcinovic, N. Tadic, M. Radovanović, G. Stojanović","doi":"10.1109/FLEPS49123.2020.9239569","DOIUrl":"https://doi.org/10.1109/FLEPS49123.2020.9239569","url":null,"abstract":"Nanocrystalline nickel manganite (NiMn $_{2} O_{4}$) was obtained by sol-gel combustion using glycine as fuel, followed by calcination at 800°C. X-ray diffraction (XRD) analysis confirmed the formation of a pure cubic spinel structure with a crystallite size of 54.5 nm. Scanning electron microscopy (SEM) of the obtained nickel manganite powder showed porous nanocrystalline morphology. The material constant (B) of the obtained nickel manganite powder applied as paste and dried at 100°C was determined as 4812 K in the temperature range 20-50°C, confirming potential application in flexible temperature sensors.","PeriodicalId":101496,"journal":{"name":"2020 IEEE International Conference on Flexible and Printable Sensors and Systems (FLEPS)","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128557662","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-08-16DOI: 10.1109/FLEPS49123.2020.9239474
A. Bucciarelli, A. Adami, Chandrakanth Reddy Chandaiahgari, L. Lorenzelli
This work reports a study by Design of Experiments (DOE) to optimize the inkjet printing parameters for a nanoparticle-based Ag ink. This method showed the interplay of the waveform parameters into the definition of optimal drop reproducibility and the achievement of the optimal resolution. In particular, it is shown that mixed terms of the model have a statistical significance and therefore the proposed multivariate approach provides a benefit in the optimization with respect to the more commonly used one-factor-at-a-time models.
{"title":"Multivariable optimization of inkjet printing process of Ag nanoparticle ink on Kapton","authors":"A. Bucciarelli, A. Adami, Chandrakanth Reddy Chandaiahgari, L. Lorenzelli","doi":"10.1109/FLEPS49123.2020.9239474","DOIUrl":"https://doi.org/10.1109/FLEPS49123.2020.9239474","url":null,"abstract":"This work reports a study by Design of Experiments (DOE) to optimize the inkjet printing parameters for a nanoparticle-based Ag ink. This method showed the interplay of the waveform parameters into the definition of optimal drop reproducibility and the achievement of the optimal resolution. In particular, it is shown that mixed terms of the model have a statistical significance and therefore the proposed multivariate approach provides a benefit in the optimization with respect to the more commonly used one-factor-at-a-time models.","PeriodicalId":101496,"journal":{"name":"2020 IEEE International Conference on Flexible and Printable Sensors and Systems (FLEPS)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122365451","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-08-16DOI: 10.1109/FLEPS49123.2020.9239431
Oliver Ozioko, Yogeenth Kumaresan, R. Dahiya
Temperature sensors with good mechanical flexibility, high sensitivity, fast response and recovery time are essential features for real time measurements by electronic Skin (eSkin). This paper presents the fabrication and characterization of a flexible temperature sensor using PEDOT: PSS and carbon nanotube (CNT) at 1:1 mixing ratio. In order to establish the performance enhancement capability of this composition, a comparative study was carried out. This was done by fabricating two flexible temperature sensors each on $sim 175 mu mathrm{m} -$ thick PVC substrate using only CNT and then with CNT/PEDOT: PSS polymer composite following simple drop casting technique. Both sensors show good sensitivity $sim 0.27$ (%)$^{circ}mathrm{C}^{-1}$)) for CNT and $sim 0.64$ (%)$^{circ}mathrm{C}^{-1}$)) for CNT/PEDOT: PSS for temperatures varying from $20^{circ}mathrm{C}$ to $80^{circ}mathrm{C}$. Although both the sensors, CNT and CNT/PEDOT: PSS composite revealed fast response and recovery time, the latter shows a higher sensitivity $(sim 0.64$(%)$^{circ}mathrm{C}^{-1}$)). Further, a comparison of the sensor made with CNT/PEDOT: PSS with similar works in literature reveals that the presented sensor exhibits relatively faster response $(sim 4.8mathrm{s})$ and recovery $(sim 2.5mathrm{s})$ time. This response enhancement can provide a biomimetic eSkin with unique feature.
温度传感器具有良好的机械灵活性、高灵敏度、快速响应和恢复时间是电子皮肤(eSkin)实时测量的基本特征。本文介绍了用PEDOT: PSS和碳纳米管(CNT)以1:1的混合比例制备柔性温度传感器并进行了表征。为了确定该组合物的性能增强能力，进行了对比研究。这是通过仅使用CNT在$sim 175 mu mathrm{m} -$厚PVC基板上制造两个柔性温度传感器，然后使用CNT/PEDOT: PSS聚合物复合材料进行简单的滴铸技术来完成的。两种传感器均具有良好的灵敏度$sim 0.27$ (%)$^{circ}mathrm{C}^{-1}$)) for CNT and $sim 0.64$ (%)$^{circ}mathrm{C}^{-1}$)) for CNT/PEDOT: PSS for temperatures varying from $20^{circ}mathrm{C}$ to $80^{circ}mathrm{C}$. Although both the sensors, CNT and CNT/PEDOT: PSS composite revealed fast response and recovery time, the latter shows a higher sensitivity $(sim 0.64$(%)$^{circ}mathrm{C}^{-1}$)). Further, a comparison of the sensor made with CNT/PEDOT: PSS with similar works in literature reveals that the presented sensor exhibits relatively faster response $(sim 4.8mathrm{s})$ and recovery $(sim 2.5mathrm{s})$ time. This response enhancement can provide a biomimetic eSkin with unique feature.
{"title":"Carbon Nanotube/PEDOT: PSS Composite-based Flexible Temperature Sensor with Enhanced Response and Recovery Time","authors":"Oliver Ozioko, Yogeenth Kumaresan, R. Dahiya","doi":"10.1109/FLEPS49123.2020.9239431","DOIUrl":"https://doi.org/10.1109/FLEPS49123.2020.9239431","url":null,"abstract":"Temperature sensors with good mechanical flexibility, high sensitivity, fast response and recovery time are essential features for real time measurements by electronic Skin (eSkin). This paper presents the fabrication and characterization of a flexible temperature sensor using PEDOT: PSS and carbon nanotube (CNT) at 1:1 mixing ratio. In order to establish the performance enhancement capability of this composition, a comparative study was carried out. This was done by fabricating two flexible temperature sensors each on $sim 175 mu mathrm{m} -$ thick PVC substrate using only CNT and then with CNT/PEDOT: PSS polymer composite following simple drop casting technique. Both sensors show good sensitivity $sim 0.27$ (%)$^{circ}mathrm{C}^{-1}$)) for CNT and $sim 0.64$ (%)$^{circ}mathrm{C}^{-1}$)) for CNT/PEDOT: PSS for temperatures varying from $20^{circ}mathrm{C}$ to $80^{circ}mathrm{C}$. Although both the sensors, CNT and CNT/PEDOT: PSS composite revealed fast response and recovery time, the latter shows a higher sensitivity $(sim 0.64$(%)$^{circ}mathrm{C}^{-1}$)). Further, a comparison of the sensor made with CNT/PEDOT: PSS with similar works in literature reveals that the presented sensor exhibits relatively faster response $(sim 4.8mathrm{s})$ and recovery $(sim 2.5mathrm{s})$ time. This response enhancement can provide a biomimetic eSkin with unique feature.","PeriodicalId":101496,"journal":{"name":"2020 IEEE International Conference on Flexible and Printable Sensors and Systems (FLEPS)","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126776849","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-08-16DOI: 10.1109/FLEPS49123.2020.9239561
Akanksha Rohit, Y. Kelestemur, S. Kaya
We present on the design and use of wearable capacitive patches with piezoelectric dielectrics for tracking motion, impact, posture, acoustic feedback and general biomedical health. The capacitive elements are based on ultra-flexible and durable textile electrodes and silicone dielectrics augmented with polyvinylidene fluoride - trifluoroethylene (PVDF-TrFE) fillers up to 30% w/v ratio. The resulting patches, deployed on appropriate locations and geometries, can capture critical information on the type, strength and duration between specific episodes of movements in the limbs as well as impact and acoustic response from the torso. This is possible due to the piezoelectric response ($d _{33} =24 pm 1$ pC/N) induced by the PVDF-TrFE/Silicone composite dielectric layer. Moreover, the periphery of the patch allows for additional compact commercial sensors to be integrated along with a bluetooth-capable micro-controller platform. Consequently, the proposed piezoelectric capacitive patches with integrated arrays of sensors are ideally suited to pursue compact, cost-effective, power-efficient solutions in the emerging era of sensor fusion for complex performance monitoring, realistic worker training and for high-risk patients.
{"title":"Ultra-Flexible and Durable Textile Capacitors with Piezoelectric PVDF Dielectrics for Wearables","authors":"Akanksha Rohit, Y. Kelestemur, S. Kaya","doi":"10.1109/FLEPS49123.2020.9239561","DOIUrl":"https://doi.org/10.1109/FLEPS49123.2020.9239561","url":null,"abstract":"We present on the design and use of wearable capacitive patches with piezoelectric dielectrics for tracking motion, impact, posture, acoustic feedback and general biomedical health. The capacitive elements are based on ultra-flexible and durable textile electrodes and silicone dielectrics augmented with polyvinylidene fluoride - trifluoroethylene (PVDF-TrFE) fillers up to 30% w/v ratio. The resulting patches, deployed on appropriate locations and geometries, can capture critical information on the type, strength and duration between specific episodes of movements in the limbs as well as impact and acoustic response from the torso. This is possible due to the piezoelectric response ($d _{33} =24 pm 1$ pC/N) induced by the PVDF-TrFE/Silicone composite dielectric layer. Moreover, the periphery of the patch allows for additional compact commercial sensors to be integrated along with a bluetooth-capable micro-controller platform. Consequently, the proposed piezoelectric capacitive patches with integrated arrays of sensors are ideally suited to pursue compact, cost-effective, power-efficient solutions in the emerging era of sensor fusion for complex performance monitoring, realistic worker training and for high-risk patients.","PeriodicalId":101496,"journal":{"name":"2020 IEEE International Conference on Flexible and Printable Sensors and Systems (FLEPS)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116740871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-08-16DOI: 10.1109/FLEPS49123.2020.9239564
Sajjad Hajian, P. Khakbaz, B. B. Narakathu, S. Masihi, M. Panahi, D. Maddipatla, V. Palaniappan, R. Blair, B. Bazuin, M. Atashbar
This work presents a comparison of humidity sensing properties of fluorinated graphene (FG) and chlorinated graphene (ClG), using experimental data and atomic-level ab-initio simulations. The fabrication of the humidity sensor included drop-casting FG and ClG suspensions on silver (Ag)based interdigitated electrodes (IDEs) to form the sensing layer. The sensitivity of FG and ClG to humidity variations was investigated by measurement of relative resistance change ($Delta R/R_{b}$) of the fabricated humidity sensors when the relative humidity (RH) was changed from 20% to 80%, in steps of 10%, at a constant temperature of 24° C. For RH transition from 20% to 80%, the $Delta R/R_{b}$ of the FG-based and the ClG-based humidity sensors were measured as 13.3% and 10.8%, respectively, resulting in a sensitivity of 0.22%/%RH and 0.18%/%RH, respectively. Density functional theory (DFT) calculations showed adsorption energy (Eads) of -0.50 eV and -0.43 eV for the physisorption of water molecules on the FG and ClG, respectively, demonstrating the higher sensitivity of the FG to humidity. The density of states (DOS) calculations showed that the water-adsorbed FG has a larger DOS near the Fermi level when compared to water-adsorbed ClG, which can be attributed to the stronger interaction and more effective charge transfer between the FG and the water molecule.
{"title":"Humidity Sensing Properties of Halogenated Graphene: A Comparison of Fluorinated Graphene and Chlorinated Graphene","authors":"Sajjad Hajian, P. Khakbaz, B. B. Narakathu, S. Masihi, M. Panahi, D. Maddipatla, V. Palaniappan, R. Blair, B. Bazuin, M. Atashbar","doi":"10.1109/FLEPS49123.2020.9239564","DOIUrl":"https://doi.org/10.1109/FLEPS49123.2020.9239564","url":null,"abstract":"This work presents a comparison of humidity sensing properties of fluorinated graphene (FG) and chlorinated graphene (ClG), using experimental data and atomic-level ab-initio simulations. The fabrication of the humidity sensor included drop-casting FG and ClG suspensions on silver (Ag)based interdigitated electrodes (IDEs) to form the sensing layer. The sensitivity of FG and ClG to humidity variations was investigated by measurement of relative resistance change ($Delta R/R_{b}$) of the fabricated humidity sensors when the relative humidity (RH) was changed from 20% to 80%, in steps of 10%, at a constant temperature of 24° C. For RH transition from 20% to 80%, the $Delta R/R_{b}$ of the FG-based and the ClG-based humidity sensors were measured as 13.3% and 10.8%, respectively, resulting in a sensitivity of 0.22%/%RH and 0.18%/%RH, respectively. Density functional theory (DFT) calculations showed adsorption energy (Eads) of -0.50 eV and -0.43 eV for the physisorption of water molecules on the FG and ClG, respectively, demonstrating the higher sensitivity of the FG to humidity. The density of states (DOS) calculations showed that the water-adsorbed FG has a larger DOS near the Fermi level when compared to water-adsorbed ClG, which can be attributed to the stronger interaction and more effective charge transfer between the FG and the water molecule.","PeriodicalId":101496,"journal":{"name":"2020 IEEE International Conference on Flexible and Printable Sensors and Systems (FLEPS)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123037287","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-08-16DOI: 10.1109/FLEPS49123.2020.9239583
Yogeenth Kumaresan, Oliver Ozioko, R. Dahiya
The soft dielectric material between the electrodes of a parallel plate type capacitive pressure sensor plays a key role in their overall response. Yet its influence has not been studied. Herein, capacitive pressure sensors fabricated with different elastomeric dielectric layers have been used to evaluate the performance. Ecoflex™ and Polydimethysiloxane (PDMS) with three different stiffnesses are utilized to fabricate four capacitive pressor sensors and their sensing performance compared. The Ecoflex-based pressure sensor reveals higher sensitivity, of 4.11kPa$^{-1}$ than the PDMS-based sensors (1.11kPa $^{-1}$) at a low-pressure regime $(lt 1$ kPa), which is suitable for light touch. With the sensitivities of 2.32kPa $^{-1}$ and 0.08kPa $^{-1}$ in the region 1 (1 to 10kPa) and region 2 (10 to 160kPa) respectively, the PDMS with 7.5:1 ratio reveals highest sensitivity among the three PDMS-based devices. The results indicate that careful selection of soft dielectric layer is important for obtaining pressure or touch sensor with desired sensitivity.
{"title":"Effect of Dielectric and Stiffness of Soft Material between the Electrodes of a Capacitive Pressure Sensor on its Performance","authors":"Yogeenth Kumaresan, Oliver Ozioko, R. Dahiya","doi":"10.1109/FLEPS49123.2020.9239583","DOIUrl":"https://doi.org/10.1109/FLEPS49123.2020.9239583","url":null,"abstract":"The soft dielectric material between the electrodes of a parallel plate type capacitive pressure sensor plays a key role in their overall response. Yet its influence has not been studied. Herein, capacitive pressure sensors fabricated with different elastomeric dielectric layers have been used to evaluate the performance. Ecoflex™ and Polydimethysiloxane (PDMS) with three different stiffnesses are utilized to fabricate four capacitive pressor sensors and their sensing performance compared. The Ecoflex-based pressure sensor reveals higher sensitivity, of 4.11kPa$^{-1}$ than the PDMS-based sensors (1.11kPa $^{-1}$) at a low-pressure regime $(lt 1$ kPa), which is suitable for light touch. With the sensitivities of 2.32kPa $^{-1}$ and 0.08kPa $^{-1}$ in the region 1 (1 to 10kPa) and region 2 (10 to 160kPa) respectively, the PDMS with 7.5:1 ratio reveals highest sensitivity among the three PDMS-based devices. The results indicate that careful selection of soft dielectric layer is important for obtaining pressure or touch sensor with desired sensitivity.","PeriodicalId":101496,"journal":{"name":"2020 IEEE International Conference on Flexible and Printable Sensors and Systems (FLEPS)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128027495","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-08-16DOI: 10.1109/FLEPS49123.2020.9239511
Meraj Ahmad, Shahid Malik, Laxmeesha Somappa, S. Sonkusale, M. Baghini
A flexible dry ECG patch for continuous heart rate variablity monitoring is presented in this paper. A flexible dry ECG patch with a polymide substrate was designed. The hardware compromises of an ECG front end, an ultra low power controller for wireless Bluetooth data transmission and a power management block. The ECG electrodes were also fabricated on the flip-side of the same polymide substrate. The electrodes were screen printed on the flexible polymide substrate using carbon ink. We demonstrate the working of the flexible dry ECG patch with experimental data on a human subject.
{"title":"A Flexible Dry ECG Patch for Heart Rate Variability Monitoring","authors":"Meraj Ahmad, Shahid Malik, Laxmeesha Somappa, S. Sonkusale, M. Baghini","doi":"10.1109/FLEPS49123.2020.9239511","DOIUrl":"https://doi.org/10.1109/FLEPS49123.2020.9239511","url":null,"abstract":"A flexible dry ECG patch for continuous heart rate variablity monitoring is presented in this paper. A flexible dry ECG patch with a polymide substrate was designed. The hardware compromises of an ECG front end, an ultra low power controller for wireless Bluetooth data transmission and a power management block. The ECG electrodes were also fabricated on the flip-side of the same polymide substrate. The electrodes were screen printed on the flexible polymide substrate using carbon ink. We demonstrate the working of the flexible dry ECG patch with experimental data on a human subject.","PeriodicalId":101496,"journal":{"name":"2020 IEEE International Conference on Flexible and Printable Sensors and Systems (FLEPS)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132186538","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-08-16DOI: 10.1109/FLEPS49123.2020.9239429
Mahmoud Wagih, N. Hillier, S. Yong, A. Weddell, S. Beeby
Sustainable battery-free operation is a requirement for wearable electronic textiles. This work presents a complete wearable textile-based radio frequency energy harvester and an energy storage module. The rectifying-antenna (rectenna) receives incident sub-1 GHz RF power from a license-free transmitter and converts it to DC with up to 90% efficiency and 8 V DC output from under 4 mW of RF power. A spray-coated in-house textile 7.1 mF supercapacitor is integrated as an energy storage unit. Electrochemical Impedance Spectroscopy has been used to characterize the supercapacitor’s impedance and a four-branch circuit model has been obtained. The 7.1 mF textile supercapacitor has been demonstrated charging to 1 V (3.55 mJ) in under 11 seconds at 1.2 m separation from a wireless power source, demonstrating over 15% end-to-end efficiency, the highest charging efficiency of a textile supercapacitor from an integrated flexible energy source.
可持续的无电池运行是可穿戴电子纺织品的要求。这项工作提出了一个完整的可穿戴的基于纺织品的射频能量采集器和能量存储模块。整流天线(整流天线)接收来自免许可证发射器的入射低于1 GHz的射频功率，并将其转换为具有高达90%效率的直流电，从低于4 mW的射频功率输出8 V直流。一个喷涂的室内纺织7.1 mF超级电容器被集成为一个能量存储单元。利用电化学阻抗谱对超级电容器的阻抗进行了表征，得到了一个四支路模型。7.1 mF的纺织超级电容器在与无线电源1.2米的距离下，在11秒内充电到1 V (3.55 mJ)，显示出超过15%的端到端效率，这是纺织超级电容器从集成柔性能源中获得的最高充电效率。
{"title":"Wearable E-Textile Wireless RF Power Supply based on a Textile Supercapacitor and a Flexible Rectenna Filament","authors":"Mahmoud Wagih, N. Hillier, S. Yong, A. Weddell, S. Beeby","doi":"10.1109/FLEPS49123.2020.9239429","DOIUrl":"https://doi.org/10.1109/FLEPS49123.2020.9239429","url":null,"abstract":"Sustainable battery-free operation is a requirement for wearable electronic textiles. This work presents a complete wearable textile-based radio frequency energy harvester and an energy storage module. The rectifying-antenna (rectenna) receives incident sub-1 GHz RF power from a license-free transmitter and converts it to DC with up to 90% efficiency and 8 V DC output from under 4 mW of RF power. A spray-coated in-house textile 7.1 mF supercapacitor is integrated as an energy storage unit. Electrochemical Impedance Spectroscopy has been used to characterize the supercapacitor’s impedance and a four-branch circuit model has been obtained. The 7.1 mF textile supercapacitor has been demonstrated charging to 1 V (3.55 mJ) in under 11 seconds at 1.2 m separation from a wireless power source, demonstrating over 15% end-to-end efficiency, the highest charging efficiency of a textile supercapacitor from an integrated flexible energy source.","PeriodicalId":101496,"journal":{"name":"2020 IEEE International Conference on Flexible and Printable Sensors and Systems (FLEPS)","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132246287","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-08-16DOI: 10.1109/FLEPS49123.2020.9239557
Tugce Delipinar, Ekin Asim Ozek, Ceyda Elcin Kaya, Sercan Tanyeli, M. Yapici
Radio frequency identification (RFID) is a well-established technology, which finds use in applications including inventory management, security, logistics, product marketing, as well as next generation flexible sensor platforms. Meanwhile, there is growing interest to use 2D materials like graphene in sensing due to its high surface to volume ratio, excellent electrical, mechanical and thermal properties. This paper capitalizes on the unique properties of graphene and ordinary fabrics and reports on the development of graphene textile-based RFID tags operating at 13.56 MHz for potential application in wearable and flexible electronics. Patterning of graphene on textile surfaces was achieved by low-cost technologies including spray, dispense and contact printing to yield circular and rectangular RFID tags with a maximum range of 3 cm and induced voltage of up to 78 mV peak-to-peak at an area of 18 cm2. Operation of the graphene textile RFID tags under different bending scenarios was tested to demonstrate the proof-of-concept in flexible and wearable sensing applications.
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