ZnO Nanoparticles-Based Ethanol Sensor with Fast Response and Low Operating Temperature

2015 ◽  
Vol 13 (10) ◽  
pp. 872-877 ◽  
Author(s):  
Bin Jiang ◽  
Yong Zhang ◽  
Xuejun Zheng ◽  
Peiwen Li ◽  
Mengjiao Yuan ◽  
...  
Keyword(s):  
Zno Nanoparticles ◽  
Operating Temperature ◽  
Fast Response ◽  
Ethanol Sensor

Ag@SnO2 core–shell material for use in fast-response ethanol sensor at room operating temperature

2013 ◽  
Vol 178 ◽  
pp. 185-191 ◽  
Author(s):  
Ren-Jang Wu ◽  
Da-Jun Lin ◽  
Ming-Ru Yu ◽  
Ming Hun Chen ◽  
Hsiao-Fang Lai
Keyword(s):  
Operating Temperature ◽  
Fast Response ◽  
Core Shell ◽  
Shell Material ◽  
Ethanol Sensor

Effect of Operating Temperature on Characteristics of Single-Walled Carbon Nanotubes Gas Sensor

2005 ◽  
Vol 486-487 ◽  
pp. 485-488 ◽  
Author(s):  
Hong Quang Nguyen ◽  
Mai Van Trinh ◽  
Jeung Soo Huh
Keyword(s):  
Carbon Nanotubes ◽  
Gas Sensor ◽  
Gas Adsorption ◽  
Operating Temperature ◽  
High Sensitivity ◽  
Single Walled Carbon Nanotubes ◽  
Fast Response ◽  
Carrier Gas ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

The effect of operating temperature on characteristics of single-walled carbon nanotubes (SWNT) based gas sensor was investigated. SWNT-based sensor was fabricated from SWNT powder (Iljin Nanotech, Korea) by screen-printing method. SWNT powder (30 mg, AP grade) was dispersed into 0.78 gram a-terpineol (Aldrich) by ultrasonic vibration for 1 hour then stirred manually for 1 hour to increase adhesion. From this condensed solution, a thick film of SWNT was printed onto alumina substrates. The film then was sintered at 300oC for 2 hours to remove residual impurities. Upon exposure to some gases such as nitrogen, ammonia or nitric oxide, resistance of the sensor dramatically changes due to gas adsorption. In our experiments, SWNT-based sensor was employed to detect NH3 gas in N2 ambience. After saturated of N2, the sensor exposes to NH3 with various concentrations (from 5 ppm to 100 ppm, diluted by N2 as carrier gas). This sensor exhibits a fast response, high sensitivity but slow recovery at room temperature. By heating at high temperature and increasing the flow-rate of carrier gas, NH3 gas desorbs easily and recovery of the sensor improved. The heating also influenced the characteristics of sensors such as response and reproducibility. Other special changes in electric property of SWNT-based sensor caused by heating are also discussed.

scholarly journals Precise Control of Surface Oxygen Vacancies in ZnO Nanoparticles for Extremely High Acetone Sensing Response

2021 ◽  
Author(s):  
Jihyun Lee ◽  
Youngmoon Choi ◽  
Byoung Joon Park ◽  
Jeong Woo Han ◽  
Hyun-Sook Lee ◽  
...  
Keyword(s):  
Zno Nanoparticles ◽  
Oxygen Vacancies ◽  
Surface Defects ◽  
High Sensitivity ◽  
Fast Response ◽  
Oxide Semiconductor ◽  
Surface Oxygen ◽  
Zno Nps ◽  
Precise Control ◽  
Optimal Surface

Abstract ZnO has been studied intensely for chemical sensors due to its high sensitivity and fast response. Here, we present a simple approach to precisely control oxygen vacancy contents to provide significantly enhanced acetone sensing performance of commercial ZnO nanopowders. A combination of H2O2 treatment and thermal annealing produces optimal surface defects with oxygen vacancies on the ZnO nanoparticles (NPs). The highest response of ~27,562 was achieved for 10 ppm acetone in 0.125 M H2O2 treated/annealed ZnO NPs at the optimal working temperature of 400 ℃, which is significantly higher than that of reported so far in various acetone sensors based on metal-oxide-semiconductor (MOS). Furthermore, first-principles calculations indicate that pre-adsorbed O formed on the surface of H2O2-treated ZnO NPs can provide a favorable adsorption energy, especially for acetone detection, due to strong bidentate bonding between carbonyl C atom of acetone molecules and pre-adsorbed O on the ZnO surface. Our study demonstrates that controlling surface oxygen vacancies by H2O2 treatment and re-annealing at optimal temperature is an effective method to improve the sensing properties of commercial MOS materials.

Dopant effects of photoreactive ZnO nanoparticles on fast response LC materials in optical compensated bend (OCB) mode liquid crystal displays

2010 ◽  
Vol 33 (7) ◽  
pp. 1069-1074 ◽  
Author(s):  
Hong‐Cheu Lin ◽  
Meng‐Dan Jiang ◽  
Ling‐Yung Wang ◽  
Wei‐Hong Chen ◽  
Szu‐Fen Chen ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Zno Nanoparticles ◽  
Liquid Crystal Displays ◽  
Fast Response

Xylene sensor based on α-MoO3 nanobelts with fast response and low operating temperature

RSC Advances ◽  
2015 ◽  
Vol 5 (24) ◽  
pp. 18655-18659 ◽  
Author(s):  
Dingsheng Jiang ◽  
Ying Wang ◽  
Wei Wei ◽  
Feng Li ◽  
Yujia Li ◽  
...  
Keyword(s):  
Hydrothermal Treatment ◽  
Treatment Strategy ◽  
Operating Temperature ◽  
Fast Response ◽  
Rapid Response ◽  
Working Temperature

The best condition of the α-MoO3 nanobelts was researched via hydrothermal treatment strategy. α-MoO3 nanobelts showed rapid response and low working temperature to xylene detection.

Ethanol Sensing Characteristics of Sn-Doped ZnO Tetrapods Sensor

2013 ◽  
Vol 770 ◽  
pp. 185-188 ◽  
Author(s):  
Theerapong Santhaveesuk ◽  
Supab Choopun
Keyword(s):  
Ethanol Concentration ◽  
Operating Temperature ◽  
Xrd Analysis ◽  
Sensor Response ◽  
Zno Nanowires ◽  
Raw Material ◽  
Ethanol Sensor ◽  
Sem Images ◽  
Doped Zno ◽  
Ethanol Sensing

Sn-doped ZnO tetrapods (T-SnZnO) were successfully synthesized using a simple thermal oxidation reaction method. Zn powder with 20 mol% of Sn powder was used as raw material and synthesized at temperature of 1,000°C under normal atmosphere. FE-SEM images revealed that the T-SnZnO exhibited a four symmetry legs with the length of 1.94±0.42 μm and the width of 260±40 nm. EDS analysis confirmed that the tetrapods contain small amount of Sn. XRD analysis indicated that the tetrapods exhibited a wurtzite hexagonal ZnO structure corresponded to Raman results. The lattice parameters a and c were 3.2494 Å and 5.2057 Å, respectively. The T-SnZnO were fabricated as ethanol sensor and tested with ethanol concentration of 50, 200, and 1,000 ppm at operating temperature between 280°C-340°C by observing I-V curve of the sensors. The sensor response increased as the increasing of the operating temperature and the ethanol concentration. Moreover, the enhancement of ethanol sensor response was observed, and the highest sensor response of 30.4 was detected at 340°C. The sensor response was higher than those of ZnO tetrapods, TiO2-ZnO tetrapods, ZnO nanowires, and TiO2-ZnO nanowires sensors.

scholarly journals Facile Hydrothermal Synthesis of Two-Dimensional Porous ZnO Nanosheets for Highly Sensitive Ethanol Sensor

2019 ◽  
Vol 2019 ◽  
pp. 1-7 ◽  
Author(s):  
Lai Van Duy ◽  
Nguyen Hong Hanh ◽  
Dang Ngoc Son ◽  
Pham Tien Hung ◽  
Chu Manh Hung ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Gas Sensing ◽  
Fast Response ◽  
Two Dimensional ◽  
Ethanol Sensor ◽  
X Ray ◽  
Transmission Electron ◽  
Porous Nanosheets ◽  
Composition And Structure ◽  
Zno Nanosheets

Two-dimensional porous ZnO nanosheets were synthesized by a facile hydrothermal method for ethanol gas-sensing application. The morphology, composition, and structure of the synthesized materials were characterized by scanning electron microscopy, energy-dispersive X-ray spectroscopy, powder X-ray diffraction, and high-resolution transmission electron microcopy. Results showed that the synthesized ZnO materials were porous nanosheets with a smooth surface and a thickness of 100 nm and a large pore size of approximately 80 nm. The as-prepared nanosheets, which had high purity, high crystallinity, and good dispersion, were used to fabricate a gas sensor for ethanol gas detection at different operating temperatures. The porous ZnO nanosheet gas sensor exhibited a high response value of 21 toward 500 ppm ethanol at a working temperature of 400°C with a reversible and fast response to ethanol gas (12 s/231 s), indicating its potential application. We also discussed the plausible sensing mechanism of the porous ZnO nanosheets on the basis of the adopted ethanol sensor.

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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