An asymmetric contact-induced self-powered 2D In2S3 photodetector towards high-sensitivity and fast-response

Nanoscale ◽  
2020 ◽  
Vol 12 (13) ◽  
pp. 7196-7205 ◽  
Author(s):  
Jianting Lu ◽  
Zhaoqiang Zheng ◽  
Jiandong Yao ◽  
Wei Gao ◽  
Ye Xiao ◽  
...  
Keyword(s):  
Power Consumption ◽  
Low Power ◽  
High Sensitivity ◽  
Fast Response ◽  
Low Power Consumption ◽  
Self Powered ◽  
High Level ◽  
Asymmetric Contact

Self-powered photodetectors have triggered extensive attention in recent years due to the advantages of high sensitivity, fast response, low power consumption, high level of integration and wireless operation.

scholarly journals Improved Sensing Capability of Integrated Semiconducting Metal Oxide Gas Sensor Devices

Sensors ◽  
2019 ◽  
Vol 19 (2) ◽  
pp. 374 ◽  
Author(s):  
Ayoub Lahlalia ◽  
Olivier Le Neel ◽  
Ravi Shankar ◽  
Siegfried Selberherr ◽  
Lado Filipovic
Keyword(s):  
Metal Oxide ◽  
Power Consumption ◽  
Low Power ◽  
Gas Sensor ◽  
High Sensitivity ◽  
Fast Response ◽  
Low Power Consumption ◽  
Response Characteristics ◽  
The Impact ◽  
Semiconducting Metal Oxide

Semiconducting metal oxide (SMO) gas sensors were designed, fabricated, and characterized in terms of their sensing capability and the thermo-mechanical behavior of the micro-hotplate. The sensors demonstrate high sensitivity at low concentrations of volatile organic compounds (VOCs) at a low power consumption of 10.5 mW. In addition, the sensors realize fast response and recovery times of 20 s and 2.3 min, respectively. To further improve the baseline stability and sensing response characteristics at low power consumption, a novel sensor is conceived of and proposed. Tantalum aluminum (TaAl) is used as a microheater, whereas Pt-doped SnO2 is used as a thin film sensing layer. Both layers were deposited on top of a porous silicon nitride membrane. In this paper, two designs are characterized by simulations and experimental measurements, and the results are comparatively reported. Simultaneously, the impact of a heat pulsing mode and rubber smartphone cases on the sensing performance of the gas sensor are highlighted.

scholarly journals Highly Sensitive Diode-Based Micro-Pirani Vacuum Sensor with Low Power Consumption

Sensors ◽  
2019 ◽  
Vol 19 (1) ◽  
pp. 188 ◽  
Author(s):  
Debo Wei ◽  
Jianyu Fu ◽  
Ruiwen Liu ◽  
Ying Hou ◽  
Chao Liu ◽  
...  
Keyword(s):  
Power Consumption ◽  
Low Power ◽  
Forward Bias ◽  
High Sensitivity ◽  
Bias Current ◽  
Low Power Consumption ◽  
Sensor Performance ◽  
Sensor Structure ◽  
Vacuum Sensor ◽  
The One

Micro-Pirani vacuum sensors usually operate at hundreds of microwatts, which limits their application in battery-powered sensor systems. This paper reports a diode-based, low power consumption micro-Pirani vacuum sensor that has high sensitivity. Optimizations to the micro-Pirani vacuum sensor were made regarding two aspects. On the one hand, a greater temperature coefficient was obtained without increasing power consumption by taking advantage of series diodes; on the other hand, the sensor structure and geometries were redesigned to enlarge temperature variation. After that, the sensor was fabricated and tested. Test results indicated that the dynamic vacuum pressure range of the sensor was from 10−1 to 104 Pa when the forward bias current was as low as 10 μA with a power consumption of 50 μW. Average sensitivity was up to 90 μV/Pa and the sensitivity of unit power consumption increased to 1.8 V/W/Pa. In addition, the sensor could also work at a greater forward bias current for better sensor performance.

Low power consumption and fast response H2S gas sensor based on a chitosan-CuO hybrid nanocomposite thin film

2020 ◽  
Vol 236 ◽  
pp. 116064 ◽  
Author(s):  
Fajr I.M. Ali ◽  
Saleh T. Mahmoud ◽  
Falah Awwad ◽  
Yaser E. Greish ◽  
Ayah F.S. Abu-Hani
Keyword(s):  
Thin Film ◽  
Power Consumption ◽  
Low Power ◽  
Gas Sensor ◽  
Fast Response ◽  
Low Power Consumption ◽  
Hybrid Nanocomposite ◽  
Nanocomposite Thin Film ◽  
H2s Gas Sensor

scholarly journals Dispersed-Monolayer Graphene-Doped Polymer/Silica Hybrid Mach-Zehnder interferometer (MZI) Thermal Optical Switch with Low-Power Consumption and Fast Response

Polymers ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 1898 ◽  
Author(s):  
Yue Cao ◽  
Daming Zhang ◽  
Yue Yang ◽  
Baizhu Lin ◽  
Jiawen Lv ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Power Consumption ◽  
Low Power ◽  
Optical Switch ◽  
Fast Response ◽  
Zehnder Interferometer ◽  
Low Power Consumption ◽  
Monolayer Graphene ◽  
Doped Polymer ◽  
Silica Hybrid

This article demonstrates a dispersed-monolayer graphene-doped polymer/silica hybrid Mach–Zehnder interferometer (MZI) thermal optical switch with low-power consumption and fast response. The polymer/silica hybrid MZI structure reduces the power consumption of the device as a result of the large thermal optical coefficient of the polymer material. To further decrease the response time of the thermal optical switch device, a polymethyl methacrylate, doped with monolayer graphene as a cladding material, has been synthesized. Our study theoretically analyzed the thermal conductivity of composites using the Lewis–Nielsen model. The predicted thermal conductivity of the composites increased by 133.16% at a graphene volume fraction of 0.263 vol %, due to the large thermal conductivity of graphene. Measurements taken of the fabricated thermal optical switch exhibited a power consumption of 7.68 mW, a rise time of 40 μs, and a fall time of 80 μs at a wavelength of 1550 nm.

Ion Gel-Coated Graphene Transistor for Ethanol Gas Sensing

2021 ◽  
Vol 105 ◽  
pp. 3-7
Author(s):  
De Sheng Liu ◽  
Jiang Wu ◽  
Zhi Ming Wang
Keyword(s):  
Power Consumption ◽  
Low Power ◽  
Industrial Production ◽  
Gas Sensing ◽  
Drunk Driving ◽  
Fast Response ◽  
Low Power Consumption ◽  
Operating Voltage ◽  
Ethanol Sensor ◽  
Ion Gel

Ethanol sensor has been widely used in our daily life and industrial production, such as drunk driving test, food fermentation monitoring, and industrial gas leakage monitoring. With the advent of the Internet of Things (IoT) era, ethanol sensors will develop towards miniaturization and low-power consumption in the near future. However, traditional ethanol sensors with large volumes and high-power consumption are difficult to meet these requirements. Therefore, it is urgent to study ethanol gas sensors based on new materials and new structures. Here, we demonstrated a flexible ethanol sensor based on an ion gel-coated graphene field-effect transistor (IGFET). The device has a small graphene channel size with a width of 300 μm and a length of 200 μm. The device showed a low operating voltage of less than |±1| V. When the device was put into an ethanol gas condition, the Dirac point voltage of the IGFET showed a negative shift, which means an n-type doping effect to the graphene channel. Furthermore, the sensor showed a normalized current change of-11% against an ethanol gas concentration of 78.51 g/L at a constant drain-source voltage of 0.1 V. In addition, the device exhibited a fast response time of ~10 s and a recovery time of ~18 s. Moreover, the detectable range of the device was found to as wide as 19.76-785.1 g/L. Based on the above results, the flexible IGFET-based ethanol sensor with small size and low-power consumption has great potential to be used in the industrial production of the IoT era.

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