composite sensor
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Author(s):  
M. M. Charithra ◽  
J. G. Manjunatha ◽  
Abdullah A. Al-Kahtani ◽  
Ammar M. Tighezza ◽  
Narges Ataollahi

Author(s):  
Khatun A Jannath ◽  
Mahmood Hassan Akhtar ◽  
NG Gurudatt ◽  
Deog-Su Park ◽  
Kwang Bok Kim ◽  
...  

Octahedral SrMoO4 nanoparticles (NPs) with a high degree of crystallinity and controlled size (250-350 nm) were synthesized for the first time by employing a facile hydrothermal method. The prepared NPs...


2021 ◽  
Vol 206 ◽  
pp. 114386
Author(s):  
Mery Vet George De la Rosa ◽  
Jean P. Feng Báez ◽  
Rodolfo J. Romañach ◽  
Vilmalí López-Mejías ◽  
Torsten Stelzer

Author(s):  
Jiahong Zhang ◽  
Chao Wang ◽  
Xiaolu Xie ◽  
Min Li ◽  
Ling Li ◽  
...  

Abstract The pressure and temperature inside the tire is mainly monitored by the tire pressure monitoring system (TPMS). In order to improve the integration of the TPMS system, moreover enhance the sensitivity and temperature-insensitivity of pressure measurement, this paper proposes a microelectromechanical (MEMS) chip-level sensor based on stress-sensitive aluminum-silicon hybrid structures with amplified piezoresistive effect and temperature-dependent aluminum-silicon hybrid structures for hardware and software temperature compensations. Two types of aluminum-silicon hybrid structures are located inside and outside the strained menbrane to simultaneously realize the measurement of pressure and temperature. The model of this composite sensor chip is firstly designed and verified for its effectiveness by using finite element numerical simulation, and then it is fabricated based on the standard MEMS process. The experiments indicate that the pressure sensitivity of the sensor is between 0.126 mV/(V·kPa) and 0.151 mV/(V·kPa) during the ambient temperature ranges from -20 ℃ to 100 ℃, while the measurement error, sensitivity and temperature coefficient of temperature-dependent hybrid structures are individually ± 0.91℃, -1.225 mV/(V·℃) and -0.150%/℃. The thermal coefficient of offset (TCO) of pressure measurement can be reduced from -3.553%FS/℃ to -0.375%FS/℃ based on the differential output of the proposed sensor. In order to obtain the better performance of temperature compensation, Elman neural network based on ant colony algorithm is applied in the data fusion of differential output to further eliminate the temperature drift error. Based on which, the overall measured error is within 3.45 kPa, which is less than ±1.15%FS. The thermal coefficient of offset (TCO) is -0.017%FS/℃, and the thermal coefficient of span (TCS) is -0.020%/FS℃. The research results may provide a useful reference for the development of the high-performance MEMS composite sensor for the TPMS system.


Polymers ◽  
2021 ◽  
Vol 13 (21) ◽  
pp. 3676
Author(s):  
Sheng-Zhe Hong ◽  
Qing-Yi Huang ◽  
Tzong-Ming Wu

Hollow indium trioxide (In2O3) nanofibers fabricated via an effectively combined method of electrospinning and high-temperature calcination were coated with nitrogen-doped graphene quantum dots (N-GQDs) prepared by a hydrothermal process through electrostatic interaction. The N-GQD-coated hollow In2O3 nanofibers served as a core for the synthesis of polyaniline (PANI)/N-GQD/hollow In2O3 nanofiber ternary composites using in situ chemical oxidative polymerization. The chemical structure and morphology of the fabricated ternary composites were characterized using Fourier transform infrared, field-emission scanning electron microscopy, and transmission electron microscopy. The gas-sensing performances of the ternary composites were estimated by a homemade dynamic test system which was supplied with a real-time resistance acquisition platform at room temperature. The response value of the PANI/N-GQD/hollow In2O3 nanofiber sensor with a loading of 20 wt% N-GQD-coated hollow In2O3 nanofiber and an exposure of 1 ppm NH3 was 15.2, which was approximately more than 4.4 times higher than that of the PANI sensor. This ternary composite sensor was proved to be very sensitive in the detection of NH3 at a range of concentration between 0.6 ppm and 2.0 ppm at room temperature, which is crucial in the detection of hepatic or kidney disease in human breath. The PANI/N-GQD/hollow In2O3 nanofiber sensor also revealed higher selectivity and repeatability when exposed to 1.0 and 2.0 ppm NH3 at room temperature. Because of the excellent selectivity and repeatability in the detection of 1.0 and 2.0 ppm NH3 at room temperature achieved in this study, it is considered that the PANI/N-GQD/hollow In2O3 nanofiber composite sensor will be a favored gas-sensing material applied on human breath for the detection of hepatic or kidney disease.


2021 ◽  
pp. 127580
Author(s):  
Xuzhi Chen ◽  
Xinglin Tong ◽  
Cui Zhang ◽  
Chengwei Deng ◽  
Yan Mao ◽  
...  

2021 ◽  
Vol 327 ◽  
pp. 112754
Author(s):  
Yanpeng Yang ◽  
Yafei Sun ◽  
Chengzhi Luo ◽  
Qiang Fu ◽  
Chunxu Pan

2021 ◽  
Vol 161 ◽  
pp. 105800 ◽  
Author(s):  
Md. Nazmul Hasan ◽  
Md. Shad Salman ◽  
Aminul Islam ◽  
Hussein Znad ◽  
Md. Munjur Hasan

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