Pub Date : 2022-07-10DOI: 10.1109/fleps53764.2022.9781482
Annatoma Arif, Robert C. Roberts
This work presents a novel simple, flexible, cost-effective, sensitive, and disposable inkjet printed (IP) electrochemical sensor on PPG Teslin SP600 substrate for aqueous lead (II) detection. The electrochemical cell contains a gold (Au) working electrode (WE), Au counter electrode (CE), and integrated silver chloride (AgCl) reference electrode (RE). The lateral dimension and area of the fabricated inkjet printed flexible (IPF) electrochemical sensor are 12×8×0.52 mm3 and 3.41 mm2 respectively. The reported sensor is initially IP using silver (Ag) nanoparticle conductive ink. The Au WE and CE are obtained with 24K brush Au-plating technology. AgCl formation occurred with dilute sodium hypochlorite (3%) immersion of the sintered Ag RE. The electrochemical sensor is characterized with 3mM of lead (II) contaminated optimized drinking water (0.1 M HCl). The fabricated novel IPF sensor is further utilized for 14.4 µg/L lead (II) contaminated optimized drinking water which is below the United States Environmental Protection Agency approved lead (II) level in the drinking water – 15 µg/L. The fabrication and characteristics/performance of the IPF electrochemical sensor were analyzed using scanning electron micrograph (SEM) images/ energy dispersive X-ray spectroscopy (EDS) and cyclic voltammetry (CV) electrochemical analyses respectively.
本研究提出了一种新颖、简单、灵活、经济、敏感的一次性喷墨印刷电化学传感器，用于PPG Teslin SP600衬底上的水铅(II)检测。该电化学电池由金(Au)工作电极(WE)、金对电极(CE)和集成氯化银(AgCl)参比电极(RE)组成。制备的喷墨印刷柔性电化学传感器的横向尺寸和面积分别为12×8×0.52 mm3和3.41 mm2。报道的传感器最初是IP使用银(Ag)纳米颗粒导电油墨。采用24K电刷镀金工艺获得了Au WE和CE。用稀次氯酸钠(3%)浸泡烧结的Ag RE，可以形成AgCl。电化学传感器的特征是3mM铅(II)污染的优化饮用水(0.1 M HCl)。制备的新型IPF传感器进一步用于14.4µg/L铅(II)污染的优化饮用水，低于美国环境保护局批准的饮用水中铅(II)水平- 15µg/L。利用扫描电镜(SEM)图像、x射线能谱(EDS)和循环伏安(CV)电化学分析对IPF电化学传感器的制备和性能进行了分析。
{"title":"Flexible Inkjet Printed Gold based Electrochemical Sensor for Aqueous Lead Detection","authors":"Annatoma Arif, Robert C. Roberts","doi":"10.1109/fleps53764.2022.9781482","DOIUrl":"https://doi.org/10.1109/fleps53764.2022.9781482","url":null,"abstract":"This work presents a novel simple, flexible, cost-effective, sensitive, and disposable inkjet printed (IP) electrochemical sensor on PPG Teslin SP600 substrate for aqueous lead (II) detection. The electrochemical cell contains a gold (Au) working electrode (WE), Au counter electrode (CE), and integrated silver chloride (AgCl) reference electrode (RE). The lateral dimension and area of the fabricated inkjet printed flexible (IPF) electrochemical sensor are 12×8×0.52 mm3 and 3.41 mm2 respectively. The reported sensor is initially IP using silver (Ag) nanoparticle conductive ink. The Au WE and CE are obtained with 24K brush Au-plating technology. AgCl formation occurred with dilute sodium hypochlorite (3%) immersion of the sintered Ag RE. The electrochemical sensor is characterized with 3mM of lead (II) contaminated optimized drinking water (0.1 M HCl). The fabricated novel IPF sensor is further utilized for 14.4 µg/L lead (II) contaminated optimized drinking water which is below the United States Environmental Protection Agency approved lead (II) level in the drinking water – 15 µg/L. The fabrication and characteristics/performance of the IPF electrochemical sensor were analyzed using scanning electron micrograph (SEM) images/ energy dispersive X-ray spectroscopy (EDS) and cyclic voltammetry (CV) electrochemical analyses respectively.","PeriodicalId":221424,"journal":{"name":"2022 IEEE International Conference on Flexible and Printable Sensors and Systems (FLEPS)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115440286","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 : 2022-07-10DOI: 10.1109/fleps53764.2022.9781586
Georgios Bairaktaris, F. Khan, R. Sporea
In today’s world of connectivity and automation, novel user interfaces are used to incorporate technology into our lives in a seamless way. Printed electronics provide the tools for making flexible and conformable electronic systems that can augment the functionality of everyday objects. However, compared to conventional, off-the-shelf devices, their performance is insufficient to obtain a functional and robust fully printed system. In this work, we are developing purpose-built photodetectors (PDs) for their use in an augmented paper platform, the Magic Bookmark. The developed PDs exhibit an on/off ratio of 0.2, resulting in a voltage swing of 200 mV, when connected to external circuitry, indicating suitability for the Magic Bookmark within high tolerances due to the readout scheme selected.
{"title":"Inkjet-printed flexible oxide photodetectors for scalable user interfaces","authors":"Georgios Bairaktaris, F. Khan, R. Sporea","doi":"10.1109/fleps53764.2022.9781586","DOIUrl":"https://doi.org/10.1109/fleps53764.2022.9781586","url":null,"abstract":"In today’s world of connectivity and automation, novel user interfaces are used to incorporate technology into our lives in a seamless way. Printed electronics provide the tools for making flexible and conformable electronic systems that can augment the functionality of everyday objects. However, compared to conventional, off-the-shelf devices, their performance is insufficient to obtain a functional and robust fully printed system. In this work, we are developing purpose-built photodetectors (PDs) for their use in an augmented paper platform, the Magic Bookmark. The developed PDs exhibit an on/off ratio of 0.2, resulting in a voltage swing of 200 mV, when connected to external circuitry, indicating suitability for the Magic Bookmark within high tolerances due to the readout scheme selected.","PeriodicalId":221424,"journal":{"name":"2022 IEEE International Conference on Flexible and Printable Sensors and Systems (FLEPS)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122566358","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 : 2022-07-10DOI: 10.1109/fleps53764.2022.9781533
B. Patella, Federico Gitto, Michele Russo, G. Aiello, A. O’Riordan, R. Inguanta
This preliminary work shows a new and innovative way to produce laser scribed reduced graphene oxide (LSGO) electrodes using different porous substrates (ranging from paper to plastic and fabric). The obtained electrodes were also tested as electrochemical sensors towards the detection of phosphate ions in water. To obtain the electrodes, a water suspension of GO was filtered on top of substrate (such as Whatman® filter paper) and a complete sensor was obtained from its reduction using a CO2 laser. The electrode is composed of working and counter electrodes made of LSGO and a reference electrode of a Ag/AgCl obtained by using a commercial AgCl conductive paste. Phosphate ions were detected by exploiting the reaction between molybdate and phosphate ions in acidic media (known in literature as molybdenum blue method). This chemical reaction produces the Keggin-type complex (PMo12O40)3−, that can be reduced under applied potential. The obtained results show that phosphate ions can be detected in a wide linear range, from 0.001 mM to 1mM, in presence of 1mM molybdate with a very satisfying selectivity. We also tried to pre-treatment the paper substrate with acidic molybdate ions in order to obtain a ready-made sensor directly usable for the detection of phosphate ions in situ avoiding any kind of real sample manipulation For this aim, the paper substrate was soaked with sulphuric acid and molybdate solution and dried in order to desorb these chemicals directly into the water sample to be analyzed. Preliminary results, shows that the process of absorption and desorption can be carried out by optimizing the volume and concentration of the absorbed solution and thus can be used to obtain a portable, easy to use and fast phosphate sensor for in situ and real time monitoring of water quality.
{"title":"Electrochemical sensor for phosphate ions based on laser scriber reduced graphene oxide","authors":"B. Patella, Federico Gitto, Michele Russo, G. Aiello, A. O’Riordan, R. Inguanta","doi":"10.1109/fleps53764.2022.9781533","DOIUrl":"https://doi.org/10.1109/fleps53764.2022.9781533","url":null,"abstract":"This preliminary work shows a new and innovative way to produce laser scribed reduced graphene oxide (LSGO) electrodes using different porous substrates (ranging from paper to plastic and fabric). The obtained electrodes were also tested as electrochemical sensors towards the detection of phosphate ions in water. To obtain the electrodes, a water suspension of GO was filtered on top of substrate (such as Whatman® filter paper) and a complete sensor was obtained from its reduction using a CO2 laser. The electrode is composed of working and counter electrodes made of LSGO and a reference electrode of a Ag/AgCl obtained by using a commercial AgCl conductive paste. Phosphate ions were detected by exploiting the reaction between molybdate and phosphate ions in acidic media (known in literature as molybdenum blue method). This chemical reaction produces the Keggin-type complex (PMo12O40)3−, that can be reduced under applied potential. The obtained results show that phosphate ions can be detected in a wide linear range, from 0.001 mM to 1mM, in presence of 1mM molybdate with a very satisfying selectivity. We also tried to pre-treatment the paper substrate with acidic molybdate ions in order to obtain a ready-made sensor directly usable for the detection of phosphate ions in situ avoiding any kind of real sample manipulation For this aim, the paper substrate was soaked with sulphuric acid and molybdate solution and dried in order to desorb these chemicals directly into the water sample to be analyzed. Preliminary results, shows that the process of absorption and desorption can be carried out by optimizing the volume and concentration of the absorbed solution and thus can be used to obtain a portable, easy to use and fast phosphate sensor for in situ and real time monitoring of water quality.","PeriodicalId":221424,"journal":{"name":"2022 IEEE International Conference on Flexible and Printable Sensors and Systems (FLEPS)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123887747","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 : 2022-07-10DOI: 10.1109/fleps53764.2022.9781585
Angelo Tricase, Anna Imbriano, E. Macchia, R. Picca, D. Blasi, L. Torsi, P. Bollella
In this paper we report a combined theoretical and experimental approach for analyzing Self Assembled Monolayers (SAMs) modified electrodes. Three different SAMs were compared, consisting in a mixed SAMs of amides and carboxylic groups (Deactivated SAMs), a SAM functionalized with an antibody (Anti-IgG SAMs), and SAM functionalized with two different proteins, Anti-IgG and Bovine Serum Albumin (BSA). Each of these samples is used to describe a different component of a SAMs modified gold electrode implemented in an Electrolyte Gated – Organic Field Effect Transistor Biosensor, where the presence of a diffuse hydrogen bonding between SAMs chains plays a key role for reaching the performance of this device, able to reach the single molecule limit of detection.
{"title":"Electrochemical Investigation of Self-Assembling Monolayers toward Ultrasensitive Sensing","authors":"Angelo Tricase, Anna Imbriano, E. Macchia, R. Picca, D. Blasi, L. Torsi, P. Bollella","doi":"10.1109/fleps53764.2022.9781585","DOIUrl":"https://doi.org/10.1109/fleps53764.2022.9781585","url":null,"abstract":"In this paper we report a combined theoretical and experimental approach for analyzing Self Assembled Monolayers (SAMs) modified electrodes. Three different SAMs were compared, consisting in a mixed SAMs of amides and carboxylic groups (Deactivated SAMs), a SAM functionalized with an antibody (Anti-IgG SAMs), and SAM functionalized with two different proteins, Anti-IgG and Bovine Serum Albumin (BSA). Each of these samples is used to describe a different component of a SAMs modified gold electrode implemented in an Electrolyte Gated – Organic Field Effect Transistor Biosensor, where the presence of a diffuse hydrogen bonding between SAMs chains plays a key role for reaching the performance of this device, able to reach the single molecule limit of detection.","PeriodicalId":221424,"journal":{"name":"2022 IEEE International Conference on Flexible and Printable Sensors and Systems (FLEPS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123888023","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 : 2022-07-10DOI: 10.1109/fleps53764.2022.9781528
P. Ranjan, P. Bhattacharya, S. Sambandan
The adaptive dielectric thin film transistor (adTFT) shows a high pass response thereby offering interesting possibilities for front-end circuits e.g. low leakage electrostatic discharge protection, filtering etc. The architecture is similar to a conventional thin film transistor but with the dielectric composed of an insulator-semiconductor-insulator stack. Here we develop analytical and TCAD models describing the physics of the device.
{"title":"Adaptive Dielectric Thin Film Transistors: Device Physics and Modeling","authors":"P. Ranjan, P. Bhattacharya, S. Sambandan","doi":"10.1109/fleps53764.2022.9781528","DOIUrl":"https://doi.org/10.1109/fleps53764.2022.9781528","url":null,"abstract":"The adaptive dielectric thin film transistor (adTFT) shows a high pass response thereby offering interesting possibilities for front-end circuits e.g. low leakage electrostatic discharge protection, filtering etc. The architecture is similar to a conventional thin film transistor but with the dielectric composed of an insulator-semiconductor-insulator stack. Here we develop analytical and TCAD models describing the physics of the device.","PeriodicalId":221424,"journal":{"name":"2022 IEEE International Conference on Flexible and Printable Sensors and Systems (FLEPS)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121319632","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 : 2022-07-10DOI: 10.1109/fleps53764.2022.9781524
G. Khandelwal, A. Dahiya, R. Dahiya
Smart textiles can sense different stimuli such as pressure, temperature etc., to allow users to react and adapt. Such features are accomplished through integration of various fiber-based sensors and electronic components in textile structures. Yarn is 1-dimensional structure which can be modified to behave as a sensor and can further be integrated with other sensors or electronics to form smart textile by techniques like weaving, knitting, and braiding. In this work, a flexible temperature sensor is reported by modifying a stainless-steel yarn with V2O5 nanowires. The current profile and temperature sensing performance is measured from 5 to 50 °C. The device exhibits sensitivity of 3.7 %/°C and response time of ~9s. The present work demonstrates the potential of using yarn as a flexible temperature sensor that can be used to realize smart textile for wearable and healthcare applications.
{"title":"V2O5 nanowires coated yarn based temperature sensor for smart textiles","authors":"G. Khandelwal, A. Dahiya, R. Dahiya","doi":"10.1109/fleps53764.2022.9781524","DOIUrl":"https://doi.org/10.1109/fleps53764.2022.9781524","url":null,"abstract":"Smart textiles can sense different stimuli such as pressure, temperature etc., to allow users to react and adapt. Such features are accomplished through integration of various fiber-based sensors and electronic components in textile structures. Yarn is 1-dimensional structure which can be modified to behave as a sensor and can further be integrated with other sensors or electronics to form smart textile by techniques like weaving, knitting, and braiding. In this work, a flexible temperature sensor is reported by modifying a stainless-steel yarn with V2O5 nanowires. The current profile and temperature sensing performance is measured from 5 to 50 °C. The device exhibits sensitivity of 3.7 %/°C and response time of ~9s. The present work demonstrates the potential of using yarn as a flexible temperature sensor that can be used to realize smart textile for wearable and healthcare applications.","PeriodicalId":221424,"journal":{"name":"2022 IEEE International Conference on Flexible and Printable Sensors and Systems (FLEPS)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124044549","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 : 2022-07-10DOI: 10.1109/fleps53764.2022.9781558
S. Khan, J. Kosel
A hybrid manufacturing method is presented using a combination of screen printing and casting, which are commonly used and widely accepted industrial manufacturing processes, to create multi-layered flexible sensors. The method enables the efficient fabrication of sensors that consist of conductive metallic pastes and silicone polymers. The feasibility of the manufacturing method is demonstrated for a parallel plate capacitive pressure sensor. The top and bottom metallic layers of the sensor are made using screen-printed nanoparticle-based silver conductive paste, while the pressure-sensitive silicone layer is formed by casting Ecoflex.
{"title":"A hybrid casting and screen-printing based manufacturing method for flexible sensors","authors":"S. Khan, J. Kosel","doi":"10.1109/fleps53764.2022.9781558","DOIUrl":"https://doi.org/10.1109/fleps53764.2022.9781558","url":null,"abstract":"A hybrid manufacturing method is presented using a combination of screen printing and casting, which are commonly used and widely accepted industrial manufacturing processes, to create multi-layered flexible sensors. The method enables the efficient fabrication of sensors that consist of conductive metallic pastes and silicone polymers. The feasibility of the manufacturing method is demonstrated for a parallel plate capacitive pressure sensor. The top and bottom metallic layers of the sensor are made using screen-printed nanoparticle-based silver conductive paste, while the pressure-sensitive silicone layer is formed by casting Ecoflex.","PeriodicalId":221424,"journal":{"name":"2022 IEEE International Conference on Flexible and Printable Sensors and Systems (FLEPS)","volume":"C-18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126765974","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 : 2022-07-10DOI: 10.1109/fleps53764.2022.9781564
D. K. Neethipathi, Priyanka Ganguly, Ajay Beniwal, M. Scott, Adrian M. Bass, R. Dahiya
Monitoring of heavy metal ions in aquatic environment can be a tedious process, especially in harsh, logistically challenging field conditions. This work demonstrates the detection of copper ions in water using a low-cost screen printed 2D molybdenum disulfide (MoS2) nanoparticle based electrochemical sensor. To deal with the common field-testing challenges, an easily disposable, flexible, compact sized reliable sensor was fabricated using a screen-printing technique. The developed sensor shows an excellent performance with a linear range of 5 µM to 1000 µM, a low limits of detection (LOD) value of just 0.3125 µM, and high repeatability with standard deviation less than 0.5%. With this performance and attractive attributes such as flexible form factor, low-cost fabrication and disposability etc. the presented sensor shows a great potential for practical applications in soil and water monitoring.
{"title":"MoS2 modified screen printed carbon electrode based flexible sensor for detection of Copper","authors":"D. K. Neethipathi, Priyanka Ganguly, Ajay Beniwal, M. Scott, Adrian M. Bass, R. Dahiya","doi":"10.1109/fleps53764.2022.9781564","DOIUrl":"https://doi.org/10.1109/fleps53764.2022.9781564","url":null,"abstract":"Monitoring of heavy metal ions in aquatic environment can be a tedious process, especially in harsh, logistically challenging field conditions. This work demonstrates the detection of copper ions in water using a low-cost screen printed 2D molybdenum disulfide (MoS2) nanoparticle based electrochemical sensor. To deal with the common field-testing challenges, an easily disposable, flexible, compact sized reliable sensor was fabricated using a screen-printing technique. The developed sensor shows an excellent performance with a linear range of 5 µM to 1000 µM, a low limits of detection (LOD) value of just 0.3125 µM, and high repeatability with standard deviation less than 0.5%. With this performance and attractive attributes such as flexible form factor, low-cost fabrication and disposability etc. the presented sensor shows a great potential for practical applications in soil and water monitoring.","PeriodicalId":221424,"journal":{"name":"2022 IEEE International Conference on Flexible and Printable Sensors and Systems (FLEPS)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128801178","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 : 2022-07-10DOI: 10.1109/fleps53764.2022.9781508
Rudra Mukherjee, A. Dahiya, R. Dahiya
Additive manufacturing is an economic and resource efficient route for development of flexible electronics for applications such as robotics, wearables, and real-time health monitoring systems. Although the 2-D and 3-D printing are mature technologies , their application in flexible electronics is still in early stage and comes with challenges such as poor reliability under repeated bending conditions. This is because the level of mechanical stresses that various components of a flexible electronic module must endure is substantially high. For example, the interconnects experience a large part of bending and twisting stresses, which can affect their conductivity and decrease the responsivity and reliability of the electronic module. In this paper, we assess the base resistance and endurance of screen-printed silver interconnects on commonly used soft and flexible substrates for up to 4000 bending and twisting cycles. It is observed that the base resistance and endurance of screen-printed silver interconnects are heavily dependent on the substrate. The endurance analysis present here will benefit applications such as smart tags, where screen printed interconnects or metal lines are extensively used.
{"title":"Torsional and bending endurance analysis of screen-printed interconnects on various flexible substrates","authors":"Rudra Mukherjee, A. Dahiya, R. Dahiya","doi":"10.1109/fleps53764.2022.9781508","DOIUrl":"https://doi.org/10.1109/fleps53764.2022.9781508","url":null,"abstract":"Additive manufacturing is an economic and resource efficient route for development of flexible electronics for applications such as robotics, wearables, and real-time health monitoring systems. Although the 2-D and 3-D printing are mature technologies , their application in flexible electronics is still in early stage and comes with challenges such as poor reliability under repeated bending conditions. This is because the level of mechanical stresses that various components of a flexible electronic module must endure is substantially high. For example, the interconnects experience a large part of bending and twisting stresses, which can affect their conductivity and decrease the responsivity and reliability of the electronic module. In this paper, we assess the base resistance and endurance of screen-printed silver interconnects on commonly used soft and flexible substrates for up to 4000 bending and twisting cycles. It is observed that the base resistance and endurance of screen-printed silver interconnects are heavily dependent on the substrate. The endurance analysis present here will benefit applications such as smart tags, where screen printed interconnects or metal lines are extensively used.","PeriodicalId":221424,"journal":{"name":"2022 IEEE International Conference on Flexible and Printable Sensors and Systems (FLEPS)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127404969","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 : 2022-07-10DOI: 10.1109/fleps53764.2022.9781556
Junjie Shi, Mahmoud Wagih, S. Beeby
Over the past decades, humidity sensors have been an important sensing component in climate monitoring, agriculture, medical diagnostics and industrial process control systems. With emerging applications such as wearable devices and the internet of things in 5G scenarios, there is a growing demand for accurate humidity measurements, low-cost manufacturing processes for high-volume, high-performance sensors with flexible form factors, and the use of environmentally friendly materials. We present a simple, fast, and cost-effective method for the large-scale fabrication of highly-conductive, all-polymer, and bio-degradable humidity sensors on flexible organic polymer (polyimide) and paper substrates. We investigate the resistive properties of different thicknesses of poly(3,4-ethylenedioxythiophehe) polystyrene sulfonate (PEDOT:PSS) on Kapton and paper substrates in response to humidity, demonstrating a 3—8 Ω/square sheet resistance, suitable for all-polymer circuits. A relative resistance variation of 36.3% at levels of relative humidity ranging from 20% to 80% is demonstrated for a pristine sample, along with 1-month ageing tests to investigate the lifetime of the proposed sensor.
{"title":"Highly Conductive Flexible Printed PEDOT:PSS films for Green Humidity Sensing Applications","authors":"Junjie Shi, Mahmoud Wagih, S. Beeby","doi":"10.1109/fleps53764.2022.9781556","DOIUrl":"https://doi.org/10.1109/fleps53764.2022.9781556","url":null,"abstract":"Over the past decades, humidity sensors have been an important sensing component in climate monitoring, agriculture, medical diagnostics and industrial process control systems. With emerging applications such as wearable devices and the internet of things in 5G scenarios, there is a growing demand for accurate humidity measurements, low-cost manufacturing processes for high-volume, high-performance sensors with flexible form factors, and the use of environmentally friendly materials. We present a simple, fast, and cost-effective method for the large-scale fabrication of highly-conductive, all-polymer, and bio-degradable humidity sensors on flexible organic polymer (polyimide) and paper substrates. We investigate the resistive properties of different thicknesses of poly(3,4-ethylenedioxythiophehe) polystyrene sulfonate (PEDOT:PSS) on Kapton and paper substrates in response to humidity, demonstrating a 3—8 Ω/square sheet resistance, suitable for all-polymer circuits. A relative resistance variation of 36.3% at levels of relative humidity ranging from 20% to 80% is demonstrated for a pristine sample, along with 1-month ageing tests to investigate the lifetime of the proposed sensor.","PeriodicalId":221424,"journal":{"name":"2022 IEEE International Conference on Flexible and Printable Sensors and Systems (FLEPS)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130463555","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}
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