Search query: flexible temperature sensor

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abstract: Abstract In this work, we report a simple, low cost, facile fabrication of a SnSe2 based high mobility Metal Insulator Semiconductor Field effect transistor (MISFET) using an unconventional Mott insulator NiO as gate dielectric for an all paper based multifunctional photoswitch and temperature sensor. A single step hydrothermal method yielded SnSe2 on cellulose paper while NiO nanofibers, synthesized using Electrospinning technique was used as gate dielectric. Cu metal tape was used as source, drain and gate contacts while NiO and SnSe2 were used as insulator and semiconductor respectively to fabricate the MISFET. Detailed characterization studies revealed the formation of SnSe2 nanoflakes and NiO nanofibers. The transfer characteristics of SnSe2/NiO FET exhibited a transconductance of 3.25 mS and mobility of 20 cm2V 1s 1 with a Ion/Ioff ratio102 which are extraordinary considering the simplicity of the cleanroom free fabrication technique adopted. The SnSe2/NiO based FET was used as a NIR photo switch and a flexible temperature sensor. The flexible SnSe2 based NIR photoswitch demonstrated a responsivity of 28 mA/cm2, detectivity of 5.25 x 106 jones. The FET based temperature sensor exhibited a TCR value of 4.3 x 10 3 degC 1, better than many commercially available temperature sensors. The higher responsivity can be attributed the effective photo generated carriers and the higher TCR can be imputed to the thermally excited electrons of uniformly grown hexagonal SnSe2 nanoflakes. The fabrication technique of a paper based FET outlined here is a step ahead in developing 2D materials based low cost, flexible multifunctional electronic devices.
author_names: Sushmitha Veeralingam

Sushmee Badhulika
title: 2D SnSe2 nanoflakes on paper with 1D NiO gate insulator based MISFET as multifunctional NIR photo switch and flexible temperature sensor
year: 2020

abstract: Textiles enhanced with thin film flexible sensors are well suited for unobtrusive monitoring of skin parameters due to the sensors' high conformability. These sensors can be damaged if they are attached to the surface of the textile, also affecting the textiles' aesthetics and feel. We investigate the effect of embedding flexible temperature sensors within textile yarns, which adds a layer of protection to the sensor. Industrial yarn manufacturing techniques including knit braiding, braiding, and double covering were utilised to identify an appropriate incorporation technique. The thermal time constants recorded by all three sensing yarns was <10 s. Simultaneously, effective sensitivity only decreased by a maximum of 14% compared to the uncovered sensor. This is due to the sensor being positioned within the yarn instead of being in direct contact with the measured surface. These sensor yarns were not affected by bending and produced repeatable measurements. The double covering method was observed to have the least impact on the sensors' performance due to the yarn's smaller dimensions. Finally, a sensing yarn was incorporated in an armband and used to measure changes in skin temperature. The demonstrated textile integration techniques for flexible sensors using industrial yarn manufacturing processes enable large scale smart textile fabrication.
author_names: Pasindu Lugoda

Julio C Costa

Carlos Oliveira

Leonardo Azael Garcia-Garcia

Sanjula D Wickramasinghe

Arash Pouryazdan

Daniel Roggen

Tilak Dias

Niko Munzenrieder
title: Flexible Temperature Sensor Integration into E Textiles Using Different Industrial Yarn Fabrication Processes
venue: Sensors
year: 2020

abstract: Disposable temperature sensors have great advantages in public health security and infectious disease control. However, complicated fabrication processes and poor performances persistently restrict their practical applications. In this paper, a flexible temperature sensor is firstly developed by directly writing or mask spraying commonly used paper with a highly thermo sensitive graphene nanoribbon (GNR) ink. The inexpensive, green materials and process endow the GNR sensors with the properties of being low cost, degradable and pollution free. The band gap and the local traps of GNRs, caused by the nanoscale effect and oxygen doping, make the sensor highly thermo sensitive. The sensor also shows fast response, precise resolution and good bendable properties. As demonstrated, the sensor achieves monitoring of respiratory rate, measurement of body temperature, identification of human touch and constituting a 5 x 5 array for temperature mapping. These results demonstrate that the GNRs sensor is highly promising as an economical disposable device for personal healthcare and disease monitoring.
author_names: Xue Gong

Longjun Zhang

Yinan Huang

Shuguang Wang

Gebo Pan

Liqiang Li
title: Directly writing flexible temperature sensor with graphene nanoribbons for disposable healthcare devices
year: 2020

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 4.8\mathrm{s} and recovery \sim 2.5\mathrm{s} time. This response enhancement can provide a biomimetic eSkin with unique feature.
author_names: Oliver Ozioko

Yogeenth Kumaresan

Ravinder S Dahiya
title: Carbon Nanotube/PEDOT: PSS Composite based Flexible Temperature Sensor with Enhanced Response and Recovery Time
venue: 2020 IEEE International Conference on Flexible and Printable Sensors and Systems (FLEPS)
year: 2020

abstract: In this research, a flexible inkjet printed temperature sensor with in house silver nanoparticles ink is presented and compared with the sensor printed with commercial silver nanoparticles ink. These sensors have an average width of 0.5 0.04 mm in the latter and 0.5 0.03 mm in the former. These serpentine structure sensors were printed on polyethylene terephthalate (PET) substrate by using a Fujifilm Dimatix 2850 printer. The corresponding results indicating resistance have been recorded in the range of 30 100 degC to evaluate the sensor performance. The result of the studies showed that there was a linear relationship between the resistance and temperature for both ink types. The printed sensors developed using the in house ink presented higher sensitivity, 0.1086 /degC, compared to the commercial ink, which was 0.0543 /degC. Therefore, the flexible inkjet printed temperature sensor with the in house silver nanoparticles ink is recommended for the large scale productions and implementations.
author_names: Qiao Jun Liew

Hing Wah Lee
title: Inkjet Printed Flexible Temperature Sensor Based on Silver Nanoparticles Ink
year: 2020

abstract: In this study, a flexible film temperature sensor was fabricated by screen printing technology. The temperature sensor was fabricated by firstly printing nano silver conductive ink and sequentially carbon temperature sensitive ink onto a flexible polyethylene terephthalate (PET) substrate. By changing the proportion of nano carbon black in the temperature sensitive ink and the sintering temperature of the nano silver conductive ink, the effects on the conductivity and temperature sensitivity of the flexible film sensor were investigated, and the linearity, hysteresis and stability of the prepared sensor were verified. When the sintering temperature of silver electrode based on PET film was 130 degC, the electrode square resistance was 10.2 mO/ When the ambient temperature varies between 25 and 75 degC, the resistance of the temperature sensor decreases as the amount of nano carbon black added increases. Besides, the flexible temperature sensor shows high linearity and good stability. By virtue of the flexibility, simple preparation process and low cost, this flexible temperature sensor that can be found useful in a certain range of applications, including wearable devices, biomedical devices, smart packaging and smart house.
author_names: Yue Shi

Shilin Huang

Zhicheng Sun

Weitie Wang

Ruping Liu
title: Performance Study of Flexible Temperature Sensor Based on Carbon Sensitive Material
year: 2020

abstract: In this research, we developed a mass production method for the preparation of thermosensitive ink composite, followed by deposition of the composite on the flexible substrate via spray coating technology. Firstly, Ag micropattern was designed and deposited on flexible polyimide substrate by high precision screen printing. The Ag interdigital electrodes with controlled spacing are realized by optimization of the sintering temperature, and the thermosensitive ink composed of polydimethylsiloxane (PDMS) mixed with graphite powder and graphene was coated on the surface of the electrodes. Effect of sintering temperature on the microstructure and electrical conductivity of Ag electrode is evaluated, and the sensitivity of the flexible temperature sensor in the large dynamic range of 15 40 degC is investigated. Finally, the sensing characteristics, response time, temperature hysteresis and effect of the spontaneous heating are tested, and the experimental results demonstrated a high performance sensor with a higher sensitivity, a smaller hysteresis, a better linearity and a faster response.
author_names: Ruping Liu

Yue Shi

Zhicheng Sun

Zhengwang Li
title: Fabrication of Flexible Temperature Sensor Based on Printed Electronics
year: 2020

abstract: Graphene derivatives are promising nanomaterials for the development of various flexible electronic devices. In this work, a flexible temperature sensor based on fluorinated graphene (FG) was developed, using screen printing and drop casting processes. Interdigitated electrodes (IDEs) were fabricated by the deposition of silver (Ag) ink on the polyimide substrate, using the screen printing process, and the FG sensing layer was formed by drop casting of FG suspension on the IDEs. The resistive response of the temperature sensor towards temperatures varying from 10 degC to 80 degC, in steps of 10 degC, was investigated. The fabricated temperature sensor has a short response time 2 s) for different target temperature levels. A linear relationship between the relative resistance change (DR/Rb) and the temperature was observed, with a slope of 0.0013/degC and a correlation coefficient of 0.9964. The overall DR/Rb of the sensor was measured as 8.85% when the temperature changed from 20degC to 80 degC. The average temperature coefficient of resistance (TCR) of the temperature sensor was calculated as 0.132 0.005 /degC for the temperature range of 20 degC to 80 degC.
author_names: Sajjad Hajian

Binu Baby Narakathu

Dinesh Maddipatla

Simin Masihi

Masoud Panahi

Richard G Blair

B J Bazuin

Massood Zandi Atashbar
title: Flexible Temperature Sensor based on Fluorinated Graphene
venue: 2020 IEEE International Conference on Electro Information Technology (EIT)
year: 2020

abstract: Integration of sensors with antennas is becoming popular for compact high performance wireless sensing systems. In this direction, here we present a silver electrodes and Poly(3,4 ethylenedioxythiophene:polystyrene (PEDOT:PSS) based printed temperature sensor on a flexible PVC substrate. The temperature sensor was characterised using a digital multimeter for a temperature range from 25$?C to 90#C. The sensor showed a 70% change in resistance for the tested temperature range. Further, the sensing part was integrated with a Near Field Communication (NFC) tag with the data obtained semi quantitatively by means of the intensity of an Light Emittign Diode (LED) connected with the antenna system. In this case, the antenna works as an energy harvester to power an LED indicator connected in series to the resistive temperature sensor. The intensity of the LED, which varies with the increase of temperature, was measured using a lux meter mobile application. The intensity at 70#C was ~42 lux whereas it decreased down to ~14 lux at room temperature ~25#C) The presented system showed potential use as a smart label in applications requiring temperature monitoring.
author_names: Mitradip Bhattacharjee

Pablo Escobedo

Fatemeh Nikbakhtnasrabadi

Ravinder S Dahiya
title: Printed Flexible Temperature Sensor with NFC Interface
venue: 2020 IEEE International Conference on Flexible and Printable Sensors and Systems (FLEPS)
year: 2020

abstract: This work present the fabrication and characterization of a flexible temperature sensor based on the flake graphite (FG)/carbon nanotube (CNT)/polydimethylsiloxane (PDMS) composite. The sensor shows high temperature sensitivity and good linearity. The FG/CNT/PDMS temperature sensitive films are prepared by the screen printing process. Superior printability of the FG/CNT/PDMS inks is demonstrated by means of rheology. Field emission scanning electron microscope investigation reveals an interpenetrating network structures between the FG and CNT. Moreover, thermal gravity analysis illustrates that the FG/CNT/PDMS temperature sensitive films have a better thermal stability than that of PDMS blank control film. The temperature dependent resistance behavior suggests that the temperature coefficient of resistance (TCR) value of the FG/CNT/PDMS films can be manipulated by the mass ratio of FG to CNT. When the mass ratio of FG to CNT is 4:1, the TCR is almost reproducible and maintained at the same level of 0.028 K 1 for repeated thermal cycles. These results indicate that the developed FG/CNT/PDMS composite has potential applications for the flexible temperature sensor.
author_names: Linhui Wu

Jun Qian

Jinhua Peng

Ke Wang

Zhangming Liu

Taolin Ma

Yihua Zhou

Gaofeng Wang

Shuangli Ye
title: Screen printed flexible temperature sensor based on FG/CNT/PDMS composite with constant TCR
venue: Journal of Materials Science: Materials in Electronics
year: 2019