Synthesis of CuO–CdS composite nanowires and their ultrasensitive ethanol sensing properties

2019 ◽  
Vol 6 (1) ◽  
pp. 238-247 ◽  
Author(s):  
Nan Zhang ◽  
Xiaohui Ma ◽  
Yanyang Yin ◽  
Yu Chen ◽  
Chuannan Li ◽  
...  
Keyword(s):  
Recovery Time ◽  
Solvothermal Method ◽  
Operating Temperature ◽  
Average Diameter ◽  
One Dimension ◽  
Sensing Properties ◽  
Response Recovery ◽  
Ethanol Sensing

One dimension CuO/CdS composites with an average diameter of 30 nm were synthesized by a solvothermal method. The operating temperature of the sensors is 182 °C, and their responses were improved by 6 times. The ultrafast response–recovery time was obtained.

CO Sensing Properties of La1-xCaxFeO3 Perovskite Nanocrystalline Materials

2011 ◽  
Vol 495 ◽  
pp. 323-326 ◽  
Author(s):  
Ming Zhao ◽  
Li Hui Sun ◽  
Ji Fan Hu ◽  
Hong Wei Qin
Keyword(s):  
Response Time ◽  
Nanocrystalline Materials ◽  
Recovery Time ◽  
Operating Temperature ◽  
Sol Gel ◽  
Nanocrystalline Powders ◽  
Orthorhombic Structure ◽  
Gel Method ◽  
Sensing Properties ◽  
Sol Gel Method

The La1-xCaxFeO3 nanocrystalline powders were prepared by sol-gel method. These powders crystallized as perovskite orthorhombic structure. With an increase of Ca content, the resistance of La1-xCaxFeO3 sensors in air decreases at first, undergoes a minimum at x=0.3, and then increases again. La1-xCaxFeO3-based sensors show sensitive responses to CO. Among those La1-xCaxFeO3-based sensors, the sensor with x=0.2 shows the highest response to 200 ppm CO at operating temperatures below 325°C. The highest response S=(RCO-Rair)/RCO for the La0.8Ca0.2FeO3 based sensor to 200 ppm CO is 87% with response time 15 s and recovery time 60 s at an operating temperature of 100°C.

Excellent Gas Sensing of CdS Nanowires Decorated with Ag Nanoparticles

2019 ◽  
Vol 19 (11) ◽  
pp. 7083-7088 ◽  
Author(s):  
Nan Zhang ◽  
Xiaohui Ma ◽  
Shengping Ruan ◽  
Yanyang Yin ◽  
Chuannan Li ◽  
...  
Keyword(s):  
Relative Humidity ◽  
Ag Nanoparticles ◽  
Gas Sensing ◽  
Average Diameter ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
Cds Nanowires ◽  
The Stability ◽  
Ethanol Sensing ◽  
The One

In this study, CdS nanowires (NWs)/Ag nanoparticle materials (CdS@Ag) with Schottky junction were synthesized by a simple process. The Ag nanoparticles with a diameter of 3–10 nm were uniformly scattered on the surface of CdS NWs with an average diameter of 30 nm. The gas sensing properties and the effect of Ag content and relative humidity on the ethanol sensing properties of CdS NWs were investigated in detail. When the relative humidity was below 60% RH, the sensor, especially the one based on [email protected], exhibited an enhanced ethanol sensing response and selectivity compared with that of pristine CdS NWs, which was believed that Ag catalyzed the reaction between ionized oxygen species and ethanol. However, excessive Ag content does not mean a higher response and even decreased the response. Also, the stability of CdS NWs and CdS@Ag NWs was also investigated, which were almost stable for four months.

Thermal, optical and gas sensing properties of ZnO films prepared by different techniques

2018 ◽  
Vol 81 (1) ◽  
pp. 10101 ◽  
Author(s):  
Sonik Bhatia ◽  
Neha Verma ◽  
Munish Aggarwal
Keyword(s):  
Gas Sensor ◽  
Recovery Time ◽  
Gas Sensing ◽  
Operating Temperature ◽  
Sol Gel ◽  
Hexagonal Wurtzite Structure ◽  
Effect Of Temperature ◽  
Zno Films ◽  
Sensing Properties ◽  
Response And Recovery

Nowadays, for environmental protection, the use of portable gas sensor is essential to detect toxic gases. To control this problem of hazardous gases, metal oxide based sensors plays a vital role. In this recent study, Indium (2 at.wt.%) doped ZnO films has been prepared by sol gel spin coating and thermal evaporation techniques on glass substrates. To enhance the sensing properties, indium (In) was used as dopant and their annealing effect of temperature was observed. Thermal properties have shown the fruitful result that prepared films are useful for the fabrication of solar cell. Electrical properties revealed that capacitance and dielectric constant decreases with increase in frequency. X-ray Diffraction showed hexagonal wurtzite structure highly oriented along (1 0 1) plane. Field emission scanning electron microscope of these synthesis films prepared by different have shown the morphology as nanospheres having size of the order of 40–60 nm. 2.0 at.% of indium as modifier resulted in highest response and selectivity towards 5 ppm of NO2 gas at different operating temperature (50–200 °C). Highest sensitivity was obtained at operating temperature of 150 °C. Prepared films have quick response and recovery time in the range of 14–27 s and 67–63 s. The highest response and recovery time of gas sensor was explained by valence ion mechanism.

Synthesized of Highly Sensitive Tin (IV)-Doped Zinc Oxide Humidity Sensor

2015 ◽  
Vol 1109 ◽  
pp. 559-563
Author(s):  
Ahmad Syakirin Ismail ◽  
Mohd Firdaus Malek ◽  
Muhammad Amir Ridhwan Abdullah ◽  
Mohamad Hafiz Mamat ◽  
M. Rusop
Keyword(s):  
Zinc Oxide ◽  
Recovery Time ◽  
Humidity Sensor ◽  
Sol Gel ◽  
High Sensitivity ◽  
Average Diameter ◽  
Undoped Sample ◽  
Immersion Method ◽  
Response Recovery ◽  
Highly Sensitive

High sensitivity Tin (IV) (Sn) - doped zinc oxide (ZnO) humidity sensor was deposited using sol-gel immersion method. The Sn-doped sample was deposited on glass substrate and undoped sample was also prepared to seem the improvement made through doping process. The analyses showed that the sensor’s morphology has become more porous and having lower average diameter of nanorods, high conductivity and higher response, recovery time, and sensitivity. The sensitivity of the sensor increased from 2 to 4 by doping with Sn.

Au-sensitized WO3 nanoparticles synthesized and their enhanced acetone sensing properties

2018 ◽  
Vol 11 (04) ◽  
pp. 1850071 ◽  
Author(s):  
Dongping Xue ◽  
Zhanying Zhang
Keyword(s):  
Recovery Time ◽  
Gas Sensing ◽  
Test Results ◽  
X Ray Diffraction ◽  
X Ray ◽  
Sensing Properties ◽  
Response Recovery ◽  
Two Samples ◽  
Gas Sensing Properties ◽  
Scanning Electron

Au-sensitized WO3 nanoparticles have been synthesized by a facile two-step hydrothermal method. The structures, morphologies and surface compositions of the materials were characterized by X-ray diffraction (XRD), energy dispersive spectroscopy (EDS) and scanning electron microscopy (SEM). The test results show that we have prepared higher purity Au-sensitized WO3 nanoparticles. The gas-sensing properties of pure and Au-sensitized WO3 nanoparticles on acetone vapor were further investigated. The results obtained show that the response-recovery time of the two samples prepared is relatively short compared to that reported in the current literature. The Au-sensitized WO3 nanoparticles are significantly more sensitive and selective than the pure WO3 nanoparticles. This may be mainly attributed to the synergy between Au and WO3. It is expected that the Au-sensitized WO3 nanoparticles thus prepared can also be used for research in other fields.

0D Zn-ZIF/2D Co-ZIF Derived 0D ZnO/2D Co3O4 Heterostructures for ppb-Level Acetone Detection

2021 ◽  
Vol 1035 ◽  
pp. 1015-1021
Author(s):  
Xiao Chang ◽  
Ya Xiong ◽  
Qing Zhong Xue
Keyword(s):  
Detection Limit ◽  
Recovery Time ◽  
Industrial Processes ◽  
Sensing Properties ◽  
Response Recovery ◽  
Acetone Detection ◽  
Sensing Performance

Detecting acetone is meaningful in industrial processes and medical fields. Herein, 0D Zn-ZIF/2D Co-ZIF derived 0D ZnO/2D Co3O4 heterostructures are originally designed to improve acetone sensing properties. It is found that when the temperature is 250 °C, the 0D ZnO/2D Co3O4 possesses the highest response (4.73) to 5 ppm acetone, which is about three times more than that of pure 0D ZnO and pure 2D Co3O4. The detection limit of 0D ZnO/2D Co3O4 sensor could be as low as 100 ppb. The response/recovery time of 0D ZnO/2D Co3O4 sensor to 100 ppm acetone is only 3 s/15 s. It is demonstrated that with the introduction of 0D ZnO, the stacking of 2D Co3O4 nanosheets is inhibited and p-n heterojunctions are formed, which could significantly enhance acetone sensing performance.

Synthesis and enhanced gas sensing properties of Au-nanoparticle decorated CdS nanowires

RSC Advances ◽  
2016 ◽  
Vol 6 (75) ◽  
pp. 70907-70912 ◽  
Author(s):  
Xiaohui Ma ◽  
Sijia guo ◽  
Jingli Shen ◽  
Yu Chen ◽  
Chuan Chen ◽  
...  
Keyword(s):  
Au Nanoparticles ◽  
Gas Sensing ◽  
Solvothermal Method ◽  
Average Diameter ◽  
Deposition Process ◽  
Au Nanoparticle ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
Cds Nanowires

CdS nanowires (NWs) with an average diameter of 30 nm were synthesized by a solvothermal method and then Au nanoparticles with a size of 10–25 nm were decorated on the surface of the as-synthesized CdS NWs through a simple deposition process.

DIP Coated Thick Films of SnO2 and it’s Ethanol Sensing Properties

2011 ◽  
Vol 110-116 ◽  
pp. 1270-1277
Author(s):  
B. Bharath ◽  
G. Pradeep Reddy
Keyword(s):  
Gas Sensing ◽  
Operating Temperature ◽  
Morphological Characteristics ◽  
X Ray Diffraction ◽  
Sensing Properties ◽  
Force Microscopy ◽  
Atomic Force ◽  
Gas Sensing Properties ◽  
Metal Oxide Gas Sensors ◽  
Ethanol Sensing

SnO2 powder was prepared by soft chemical method. The Structure and Morphological characteristics of SnO2powder was analyzed by X-Ray Diffraction (XRD), Atomic Force Microscopy (AFM), UV, FTIR and Scanning Electron Microscopy (SEM) techniques. Its gas sensing properties are analyzed towards toxic gas at ppm level. Sensitivity of a SnO2oxide based sensor towards an analyte gas can be enhanced by using the metals in different geometries viz, thick film. The gas sensing properties were studied towards reducing gas like ethanol and it is observed that SnO2shows high response to ethanol at relatively lower operating temperature. The SnO2nanomaterial shows better sensitivity towards ethanol at an operating temperature 2500C. Ethanol vapour has been one of the most extensively studied gases for metal oxide gas sensors.

Synthesis and ethanol sensing properties of Al-doped ZnO nanofibers

2013 ◽  
Vol 13 (2) ◽  
pp. 403-407 ◽  
Author(s):  
Minggang Zhao ◽  
Xinchang Wang ◽  
Jipeng Cheng ◽  
Liwei Zhang ◽  
Jianfeng Jia ◽  
...  
Keyword(s):  
Sensing Properties ◽  
Zno Nanofibers ◽  
Doped Zno ◽  
Ethanol Sensing
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