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Oxygen doping modulating thermal-activated charge transport of reduced graphene oxide for high performance temperature sensors

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Chinese Chemical Letters 2023年第12期34卷 225-230页

作者： Liqian Yuan Zhongwu Wang Yancheng Meng Shuguang Wang Yajing Sun Yinan Huang Liqiang Li Wenping Hu Tianjin Key Laboratory of Molecular Optoelectronic Sciences Department of ChemistryInstitute of Molecular Aggregation ScienceTianjin UniversityTianjin300072China Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityBinhai New CityFuzhou 350207China Haihe Laboratory of Sustainable Chemical Transformations Tianjin 300192China Key Laboratory for Intelligent Nano Materials and Devices of the Ministry of Education State Key Laboratory of Mechanics and Control of Mechanical StructuresInstitute for Frontier ScienceNanjing University of Aeronautics and AstronauticsNanjing 210016China

Graphene and its derivatives have sparked intense research interest in wearable temperature sensing due to their excellent electric properties,mechanical flexibility,and good *** these ad-vantages,the weak temperature dependence of charge transport makes them difficult to achieve a highly sensitive temperature response,which is one of the remaining bottlenecks in the progress towards practi-cal ***,detailed knowledge about the key factors of the charge transport temper-ature dependence in this material that determines the critical performance of electrical sensors is very limited up to ***,we reveal that oxygen absorption on the ultrathin reduced graphene oxide(RGO)films(~3 nm)can significantly increase their conductance activation energy over 200%and thus greatly improve the temperature dependence of thermal-activated charge *** investigations sug-gest that oxygen introduces the deep acceptor states,distributed at an energy level~0.175ev from the valence-band maximum,which allows a highly temperature-dependent impurity ionization process and the resulting vast holes release in a wide temperature ***,our temperature sensors based on oxygen-doped ultrathin RGO films show a high sensitivity with temperature conductive coefficient of 14.58%K^(-1),which is one order of magnitude higher than the reported CNT or graphene-based ***,the ultrathin thickness and high thermal conductivity of RGo film allow an ultrafast response time of~86ms,which represents the best level of temperature sensors based on soft ***-ing from these advantages,our sensors show good capacity to identify the slight temperature difference of human body,monitor respiratory rate,and detect the environmental *** work not only represents substantial performance advances in temperature sensing,but also provides a new approach to modulate the charge transport temperature dependence,which could b

关键词： temperature sensors Reduced graphene oxide(RGO) Oxygendoping temperature dependence of thermal-activated charge transport Sensitivity Response time

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temperature Dependence of Electrical Properties of Organic Thin Film Transistors Based on pn Heterojuction and Their Applications in temperature sensors

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Journal of Computer and Communications 2016年第5期4卷 10-15页

作者： Rongbin Ye Koji Ohta Mamoru Baba Faculty of Engineering Iwate University Morioka Japan

Organic thin film transistors based on an F16CuPc/α6T pn heterojunction have been fabricated and analyzed to investigate the temperature dependence of electrical properties and apply in temperature sensors. The mobility follows a thermally activated hopping process. At temperatures over 200 K, the value of thermal activation energy (EA) is 40. 1 meV, similar to that of the single-layer device. At temperatures ranging from 100 to 200 K, we have a second regime with a much lower EA of 16.3 meV, where the charge transport is dominated by shallow traps. Similarly, at temperatures above 200 K, threshold voltage (VT) increases linearly with decreasing temperature, and the variations of VT of 0.185 V/K is larger than the variation of VT (~0.020 V/K) in the single layer devices. This result is due to the interface dipolar charges. At temperatures ranging from 100 K to 200 K, we have a second regime with much lower variations of 0.090 V/K. By studying gate voltage (VG)-dependence temperature variation factor (k), the maximum value of k (~0.11 dec/K) could be obtained at VG = 5 V. Furthermore, the pn heterojunction device could be characterized as a temperature sensor well working at low operating voltages.

关键词： Organic Thin Film Transistors pn Heterojunction temperature Dependence temperature sensors

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High-sensitivity temperature sensor based on Bragg grating in BDK-doped photosensitive polymer optical fiber

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Chinese Optics Letters 2011年第2期9卷 8-10页

作者：程旭升邱薇薇武文轩罗艳华田秀杰张其锦朱冰 Department of Electronic Engineering and Information Science University of Science and Technology of China Anhui Key Laboratory of Soft Matter Chemistry Department of Polymer Science and EngineeringUniversity of Science and Technology of China

A single-mode polymer optical fiber （POF） with highly photosensitive core doped with benzil dimethyl ketal （BDK） is fabricated and used for writing Bragg grating through the two-beam interference method. The Bragg wavelength of the grating is about 1570 nm, while the full-width at half-maximum （FWHM） of the reflection peak is 0.3 nm. The temperature response of POF Bragg grating is theoretically analyzed and experimentally measured in contrast to silica optical fiber Bragg grating （FBG）. The result shows that the temperature character of POF Bragg grating is negative, which is opposite to the silica optical FBG. The absolute value of the temperature response of POF Bragg grating is one order of magnitude higher than that of the silica optical FBG, making POF Bragg grating appear to be very attractive for constructing temperature sensors with high resolution.

关键词： Fiber Bragg gratings Fiber optic sensors Light sensitive materials Optical fibers Photosensitivity Silica temperature sensors

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A high sensitive fiber Bragg grating cryogenic temperature sensor

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Chinese Optics Letters 2009年第2期7卷 121-123页

作者：李阔周振安刘爱春 Institute of Crustal Dynamics China Earthquake Administration

At cryogenic temperature, a fiber Bragg grating （FBG） temperature sensor with controllable sensitivity and variable measurement range is demonstrated by using bimetal configuration. In experiments, sensitivities of -51.2, -86.4, and -520 pm/K are achieved by varying the lengths of the metals. Measurement ranges of 293 - 290.5, 283 - 280.5, and 259 - 256.5 K are achieved by shortening the distance of the gap among the metals.

关键词： Cryogenics Fiber optic components Fiber optic sensors temperature sensors

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Improving spatial resolution in fiber Raman distributed temperature sensor by using deconvolution algorithm

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Chinese Optics Letters 2009年第7期7卷 560-563页

作者：张磊冯雪张巍刘小明 State Key Laboratory on Integrated Optoelectronics/Tsinghua National Laboratory for Information Science and Technology Tsinghua University

The deconvolution algorithm is adopted on the fiber Raman distributed temperature sensor （FRDTS） to improve the spatial resolution without reducing the pulse width of the light source. Numerical simulation shows that the spatial resolution is enhanced by four times using the frequency-domain deconvolution algorithm with high temperature accuracy. In experiment, a spatial resolution of 15 m is realized using a master oscillator power amplifier light source with 300-ns pulse width. In addition, the dispersion-induced limitation of the minimum spatial resolution achieved by deconvolution algorithm is analyzed. The results indicate that the deconvolution algorithm is a beneficial complement for the FRDTS to realize accurate locating and temperature monitoring for sharp temperature variations.

关键词： Algorithms Computer simulation Convolution Image resolution Light Light sources Power amplifiers temperature sensors

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Physical sensors for skin-inspired electronics

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InfoMat 2020年第1期2卷 184-211页

作者： Shuo Li Yong Zhang Yiliang Wang Kailun Xia Zhe Yin Huimin Wang Mingchao Zhang Xiaoping Liang Haojie Lu Mengjia Zhu Haomin Wang Xinyi Shen Yingying Zhang Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education Department of ChemistryTsinghua UniversityBeijingChina

Skin,the largest organ in the human body,is sensitive to external *** recent years,an increasing number of skin-inspired electronics,including wearable electronics,implantable electronics,and electronic skin,have been developed because of their broad applications in healthcare and *** sensors are one of the key building blocks of skin-inspired *** physical sensors include mechanical sensors,temperature sensors,humidity sensors,electrophysiological sensors,and so *** this review,we systematically review the latest advances of skin-inspired mechanical sensors,temperature sensors,and humidity *** working mechanisms,key materials,device structures,and performance of various physical sensors are summarized and discussed in *** applications in health monitoring,human disease diagnosis and treatment,and intelligent robots are *** addition,several novel properties of skin-inspired physical sensors such as versatility,self-healability,and implantability are ***,the existing challenges and future perspectives of physical sensors for practical applications are discussed and proposed.

关键词： electronics skin flexible electronics humidity sensors mechanical sensors temperature sensors wearable sensors

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Determination of the Postmortem Interval Using Fiber Bragg Grating sensors

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Fluid Dynamics & Materials Processing 2023年第3期19卷 831-844页

作者： M.Adjailia H.Derbal Habak Y.Hamaizi H.Triki Radiation Physics Laboratory Department of PhysicsFaculty of SciencesBadji Mokhtar UniversityAnnabaAlgeria Univesity of Picardie Jules Verne LTI LaboratoryAimensFrance

Fiber Bragg grating(FBG)sensors are often used in monitoring activities and to ensure that environmental parameters satisfy industrial *** offer crucial safety measures in the early detection of hazards due to their greatly reduced size,low weight,flexibility,and immunity to electromagnetic *** characteristics make FBGs suitable also for use in relation to the human body for in vivo measurements and long-term *** this study,recent developments are presented with regard to the utilization of these sensors to measure the so-called post-mortem interval(PMI).Such developments rely on numerical simulations based on the Matlab software and monitoring of the rectal temperature,which is one of the main parameters for estimating the ***,the Matlab software is used to solve the Henssge equation for different ambient temperatures and for different body masses;then a Bragg grating sensors is used for post-mortem *** results and their accuracy are discussed.

关键词： Fiber bragg grating temperature sensors Henssge’s nomogram post-mortem interval biomedicine

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A NEW FABRICATION PROCESS FOR A FLEXIBLE SKIN WITH temperature SENSOR ARRAY AND ITS APPLICATIONS

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Acta Mechanica Sinica 2004年第2期20卷 140-145页

作者： LEE Gwo-Bin HUANG Fu-Chun LEE Chia-Yen MIAU Jiun-Jih DepartmentofEngineeringScience NationalChengKungUniversityTainanTaiwan701China InstituteofAeronauticsandAstronautics NationalChengKungUniversityTainanTaiwan701China

This paper reports a novel technique for fabrication of a flexible skin with a temperature sensor array (40×1 sensors). A simplified MEMS technology using platinum resistors as sensing materials, which are sandwiched between two polyimide layers as flexible substrates is developed. The two polyimide layers are deposited on top of a thin aluminum layer, which serves as a sacrificial layer such that the flexible skin can be released by metal etching and peeled off easily. The flexible skin with a temperature sensor array has a high mechanical flexibility and can be handily attached on a highly curved surface to detect tiny temperature distribution inside a small area. The sensor array shows a linear output and has a sensitivity of 7.5 mV/°C (prior to amplifiers) at a drive current of 1 mA. To demonstrate its applications, two examples have been demonstrated, including measurement of temperature distribution around a micro heater of a micro PCR (polymerase chain reaction) chip for DNA amplification and detection of separation point for flow over a circular cylinder. The development of the flexible skin with a temperature sensor array may be crucial for measuring temperature distribution on any curved surface in the fields of aerodynamics, space exploration, auto making and biomedical applications etc.

关键词： MEMS flexible skin temperature sensors TCR polyimide

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Optimization of frequency characteristics for SAW device using apodization weighting method

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Optoelectronics Letters 2015年第2期11卷 88-91页

作者：周磊张楷亮王芳韩叶梅苗银萍李冬梅梁圣法 Tianjin Key Laboratory of Film Electronic & Communication Devices School of Electronics Information Engineering Tianjin University of Technology Institute of Microelectronics Chinese Academy of Sciences

In this paper,the positive influence of apodization weighting method on frequency characteristics of surface acoustic wave(SAW)temperature sensor is *** and experiment results show that side lobe suppression abilities of the sensor can be improved by using apodization weighting which is based on Chebyshev ***,we find that the side lobe of the sensor can be further restrained,when the dummy electrodes are ***-temperature characteristics of the devices are independent of the inclusion of dummy *** apodization weighted SAW temperature sensor shows great application potential in occasions with strong electromagnetic interference.

关键词： Acoustic waves Acoustics Electrodes Electromagnetic pulse temperature sensors

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Study on a novel photonic crystal temperature sensor

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Optoelectronics Letters 2011年第6期7卷 419-422页

作者：傅海威赵辉乔学光李岩赵大壮雍振 Department of Physics Northwest University School of science Xi'an Shiyou University

In this paper, a model of photonic crystal temperature sensor based on crystal microcavity in a straight photonic crystal waveguide is proposed. The transmission characteristics of light in the sensor under different temperatures are simulated by using finite-difference time-domain (FDTD) method. The thermal expansion and thermal-optic effects of silicon are taken into account. The results show that the resonant wavelength of microcavity increases linearly as the temperature rising. The wavelength shift along with temperature is 6.6 pm /℃.

关键词： Finite difference time domain method Light transmission Microcavities temperature sensors Thermal expansion Time domain analysis

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