scholarly journals PEDOT:PSS-Based Temperature-Detection Thread for Wearable Devices

Sensors ◽  
2018 ◽  
Vol 18 (9) ◽  
pp. 2996 ◽  
Author(s):  
Jin-Woo Lee ◽  
Dong-Cheul Han ◽  
Han-Jae Shin ◽  
Se-Hyeok Yeom ◽  
Byeong-Kwon Ju ◽  
...  
Keyword(s):  
Negative Temperature Coefficient ◽  
Negative Temperature ◽  
Wearable Devices ◽  
Temperature Sensors ◽  
Temperature Sensing ◽  
Polystyrene Sulfonate ◽  
Sensing Element ◽  
Temperature Detection ◽  
Military Applications ◽  
P Type

In this research, we developed a wearable temperature-sensing element by dip dyeing threads in poly (3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) (p-type conducting polymer) solution. The PEDOT:PSS was used to dye the textile and it exhibited negative temperature coefficient characteristics in which the resistance decreases as the temperature increases. The fabricated temperature-detection thread achieved a sensitivity of 167.1 Ω/°C with 99.8% linearity in the temperature range of −50 °C to 80 °C. We anticipate that temperature sensors that apply our technology will be made as stitch- or textile-type for wearable devices, and they will be widely adopted for different applications such as in fitness, leisure, healthcare, medical treatment, infotainment, industry, and military applications, among others.

scholarly journals PEDOT:PSS-Based Temperature-Detection Thread for Wearable Devices

2018 ◽  
Author(s):  
Jin-Woo Lee ◽  
Dong-Cheul Han ◽  
Han-Jae Shin ◽  
Se-Hyeok Yeom ◽  
Byeong-Kwon Ju ◽  
...  
Keyword(s):  
Negative Temperature Coefficient ◽  
Negative Temperature ◽  
Wearable Devices ◽  
Temperature Sensors ◽  
Temperature Sensing ◽  
Polystyrene Sulfonate ◽  
Sensing Element ◽  
Temperature Detection ◽  
Military Applications ◽  
P Type

In this research, we developed a wearable temperature-sensing element by dip dyeing threads in poly (3, 4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) (p-type conducting polymer) solution. The PEDOT:PSS was used to  dye the textile and it exhibited negative temperature coefficient characteristics in which the resistance decreases as the temperature increases. The fabricated temperature-detection thread achieved a sensitivity of 167.1 W/°C with 99.8% linearity in the temperature range of -50 to 80 °C. We anticipate that temperature sensors that apply our technology will be made as stitch- or textile-type for wearable devices, and they will be widely adopted for different applications such as in fitness, leisure, healthcare, medical treatment, infotainment, industry, and military applications, among others.

Lightweight and conductive carbon black/chlorinated poly(propylene carbonate) foams with a remarkable negative temperature coefficient effect of resistance for temperature sensor applications

2018 ◽  
Vol 6 (35) ◽  
pp. 9354-9362 ◽  
Author(s):  
Xihua Cui ◽  
Jianwen Chen ◽  
Yutian Zhu ◽  
Wei Jiang
Keyword(s):  
Carbon Black ◽  
Temperature Coefficient ◽  
Propylene Carbonate ◽  
Temperature Sensor ◽  
Negative Temperature Coefficient ◽  
Negative Temperature ◽  
Temperature Sensors ◽  
Sensor Applications ◽  
Conductive Carbon Black ◽  
Poly Propylene

Lightweight and biodegradable crosslinked CB/CPPC foams exhibit a remarkable nearly-linear negative temperature coefficient effect, which has great potential in temperature sensors.

scholarly journals Enhanced aging and thermal shock performance of Mn1.95-xCo0.21Ni0.84SrxO4 NTC ceramics

2020 ◽  
Author(s):  
Haibing Li ◽  
H.M. Zhang ◽  
Islla P Ley Thayil ◽  
Aimin Chang ◽  
Xu Sang ◽  
...  
Keyword(s):  
Relative Density ◽  
Thermal Shock ◽  
Stable Distribution ◽  
Negative Temperature Coefficient ◽  
Critical Role ◽  
Negative Temperature ◽  
Lattice Parameter ◽  
Precipitation Method ◽  
Co Precipitation ◽  
P Type

Abstract Herein, the Mn1.95-xCo0.21Ni0.84SrxO4 (MCNS) (0 ≤ x ≤ 0.15) based negative temperature coefficient (NTC) materials are prepared by co-precipitation method. The replacement of Mn by Sr plays a critical role in controlling the lattice parameter, relative density, microstructure and electrical properties. The lattice parameter and relative density increase with the increase of Sr content. A small amount of Sr restrains the grain growth and increases the bulk density. Moreover, the ρ25, B25/50, Ea and α values of MCNS ceramics are influenced by the Sr content and ranged from 1535.0-2053.6 Ω·cm, 3654-3709 K, 0.3149-0.3197 eV and -4.111--4.173%, respectively. The XPS results explain the transformation of MCNS ceramics from n- to p-type semiconductors. The conduction could arise from the hopping polaron between Mn3+/Mn4+ and Co2+/Co3+ in the octahedral sites. Furthermore, the aging coefficient (△R/R) of MCNS ceramics is found to be < 0.2%, which indicates the stable distribution of cations in the spinel. Finally, the MCNS ceramics demonstrate excellent thermal durability with <1.3% of resistance shift after 100 thermal shock cycles.

Effect of Different Solvents on Cu Micropatterns Formed via Femtosecond Laser Reduction Patterning

2016 ◽  
Vol 10 (6) ◽  
pp. 934-940 ◽  
Author(s):  
Mizue Mizoshiri ◽  
◽  
Shun Arakane ◽  
Junpei Sakurai ◽  
Seiichi Hata ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Temperature Sensor ◽  
Laser Scanning ◽  
Negative Temperature Coefficient ◽  
Negative Temperature ◽  
Scanning Speed ◽  
Temperature Sensors ◽  
Cuo Nanoparticles ◽  
Laser Scanning Speed ◽  
Laser Reduction

We investigated the effect of different solvents on the Cu micropatterns formed via femtosecond laser reduction patterning. Solvents such as ethylene glycol, 2-propanol, and glycerol were mixed with CuO nanoparticles and polyvinylpyrrolidone. The degree of reduction and the resistivity of the fabricated micropatterns depended on the solvent. Glycerol was the most effective reducing agent. This solution was used to fabricate Cu/Cu2O composite micro-temperature sensors. Cu-rich electrodes and Cu2O-rich sensors were selectively formed by controlling the laser scanning speed at 5 mm/s and 0.5 mm/s, respectively, when the pulse energy was 0.53 nJ. The temperature sensor exhibited a negative temperature coefficient of the resistance, which was consistent with the value for Cu2O.

Structural, optical and electrical properties of thermal evaporated nano sized In2Te3 thin films

2018 ◽  
Vol 1 (1) ◽  
pp. 21-25
Author(s):  
R Revathi ◽  
R Karunathan
Keyword(s):  
Thin Films ◽  
Negative Temperature Coefficient ◽  
Thermal Evaporation ◽  
Structural Parameters ◽  
Negative Temperature ◽  
Resistivity Measurements ◽  
Allowed Transition ◽  
Evaporation Technique ◽  
Indium Telluride ◽  
Made In

Indium Telluride thin films were prepared by thermal evaporation technique. Films were annealed at 573K under vacuum for an hour. Both as-deposited and annealed films were used for characterization. The structural parameters were discussed on the basis of annealing effect for a film of thickness 1500 Å. Optical analysis was carried out on films of different thicknesses for both as - deposited and annealed samples. Both the as- deposited and annealed films exhibit direct and allowed transition. Electrical resistivity measurements were made in the temperature range of 303-473 K using Four-probe method. The calculated resistivity value is of the order of 10-6 ohm meter. The activation energy value decreases with increasing film thickness. The negative temperature coefficient indicates the semiconducting nature of the film.

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