scholarly journals Gas-sensing behaviour of ZnO/diamond nanostructures

2018 ◽  
Vol 9 ◽  
pp. 22-29 ◽  
Author(s):  
Marina Davydova ◽  
Alexandr Laposa ◽  
Jiri Smarhak ◽  
Alexander Kromka ◽  
Neda Neykova ◽  
...  
Keyword(s):  
Microwave Plasma ◽  
Gas Sensing ◽  
Zno Nanorods ◽  
Chemical Vapour ◽  
Deposition Process ◽  
Hybrid Structure ◽  
X Ray Diffraction ◽  
Gas Sensing Properties ◽  
P Type ◽  
Synthesized Materials

Microstructured single- and double-layered sensor devices based on p-type hydrogen-terminated nanocrystalline diamond (NCD) films and/or n-type ZnO nanorods (NRs) have been obtained via a facile microwave-plasma-enhanced chemical vapour deposition process or a hydrothermal growth procedure. The morphology and crystal structure of the synthesized materials was analysed with scanning electron microscopy, X-ray diffraction measurements and Raman spectroscopy. The gas sensing properties of the sensors based on i) NCD films, ii) ZnO nanorods, and iii) hybrid ZnO NRs/NCD structures were evaluated with respect to oxidizing (i.e., NO2, CO2) and reducing (i.e., NH3) gases at 150 °C. The hybrid ZnO NRs/NCD sensor showed a remarkably enhanced NO2 response compared to the ZnO NRs sensor. Further, inspired by this special hybrid structure, the simulation of interaction between the gas molecules (NO2 and CO2) and hybrid ZnO NRs/NCD sensor was studied using DFT calculations.

NO-sensing characteristics of ZnO nanorods prepared by the ultrasound radiation method

2007 ◽  
Vol 221 (2) ◽  
pp. 67-72
Author(s):  
J-W Kim ◽  
S-M Park ◽  
E-G Oh ◽  
J-B Yu ◽  
H-G Byun ◽  
...  
Keyword(s):  
Gas Sensing ◽  
Zno Nanorods ◽  
Zinc Nitrate ◽  
X Ray Diffraction ◽  
Radiation Method ◽  
Gas Sensing Properties ◽  
Ultrasound Radiation ◽  
Ceramic Microstructure ◽  
Sensing Characteristics ◽  
Direct Immersion

In this study, zinc oxide (ZnO) sensors were fabricated from ZnO nanorods prepared by ultrasound radiation method, and their gas-sensing properties were investigated for nitric oxide (NO), trimethylamine ((CH3)3N), hydrogen sulphide (H2S), carbon monoxide (CO), and methyl mercaptan (CH3SH). In the procedure, zinc nitrate hydrate (Zn(NO3)2·6H2O) and hexamethyleneteramine (C6H12N4,) were dissolved in deionized water and then the solution was irradiated with high-intensity ultrasound radiation for 1 h by employing a direct immersion of titanium horn. The length of the ZnO nanorods was from 250 nm to 500 nm and the diameter was from 40 nm to 80 nm. The size of the ZnO nanorods can be controlled by the concentration of the solution. The sensing characteristics of these nanostructures were investigated for three kinds of sensor fabricated by different concentrations (0.01, 0.005, and 0.001 M) of solution. It was observed that the property of the sensors was influenced by the morphology. The crystal structure and ceramic microstructure of the ZnO nanorods were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM).

Gas sensing properties of Zn-doped p-type nickel ferrite

2012 ◽  
Vol 171-172 ◽  
pp. 354-360 ◽  
Author(s):  
A. Sutka ◽  
G. Mezinskis ◽  
A. Lusis ◽  
M. Stingaciu
Keyword(s):  
Nickel Ferrite ◽  
Gas Sensing ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
P Type ◽  
Type Nickel

Polyaniline/SnO2 Nanocomposite Sensor for NO2 Gas Sensing at Low Operating Temperature

2015 ◽  
Vol 14 (04) ◽  
pp. 1550011 ◽  
Author(s):  
A. Sharma ◽  
M. Tomar ◽  
V. Gupta ◽  
A. Badola ◽  
N. Goswami
Keyword(s):  
Thin Films ◽  
Gas Sensing ◽  
High Sensitivity ◽  
Morphological Properties ◽  
X Ray Diffraction ◽  
Chemical Route ◽  
Sensing Properties ◽  
Response Recovery ◽  
Transmission Electron ◽  
Gas Sensing Properties

In this paper gas sensing properties of 0.5–3% polyaniline (PAni) doped SnO 2 thin films sensors prepared by chemical route have been studied towards the trace level detection of NO 2 gas. The structural, optical and surface morphological properties of the PAni doped SnO 2 thin films were investigated by performing X-ray diffraction (XRD), Transmission electron microscopy (TEM) and Raman spectroscopy measurements. A good correlation has been identified between the microstructural and gas sensing properties of these prepared sensors. Out of these films, 1% PAni doped SnO 2 sensor showed high sensitivity towards NO 2 gas along with a sensitivity of 3.01 × 102 at 40°C for 10 ppm of gas. On exposure to NO 2 gas, resistance of all sensors increased to a large extent, even greater than three orders of magnitude. These changes in resistance upon removal of NO 2 gas are found to be reversible in nature and the prepared composite film sensors showed good sensitivity with relatively faster response/recovery speeds.

Au sensitized ZnO nanorods for enhanced liquefied petroleum gas sensing properties

2016 ◽  
Vol 371 ◽  
pp. 224-230 ◽  
Author(s):  
U.T. Nakate ◽  
R.N. Bulakhe ◽  
C.D. Lokhande ◽  
S.N. Kale
Keyword(s):  
Gas Sensing ◽  
Zno Nanorods ◽  
Liquefied Petroleum Gas ◽  
Sensing Properties ◽  
Gas Sensing Properties

scholarly journals Chemically synthesized PbS Nano particulate thin films for a rapid NO2 gas sensor

2016 ◽  
Vol 34 (1) ◽  
pp. 204-211 ◽  
Author(s):  
Vishal V. Burungale ◽  
Rupesh S. Devan ◽  
Sachin A. Pawar ◽  
Namdev S. Harale ◽  
Vithoba L. Patil ◽  
...  
Keyword(s):  
Thin Films ◽  
Gas Sensor ◽  
Gas Sensing ◽  
Operating Temperature ◽  
Morphological Properties ◽  
X Ray Diffraction ◽  
Gas Sensitivity ◽  
Silar Method ◽  
Layer Adsorption ◽  
Gas Sensing Properties

AbstractRapid NO2 gas sensor has been developed based on PbS nanoparticulate thin films synthesized by Successive Ionic Layer Adsorption and Reaction (SILAR) method at different precursor concentrations. The structural and morphological properties were investigated by means of X-ray diffraction and field emission scanning electron microscope. NO2 gas sensing properties of PbS thin films deposited at different concentrations were tested. PbS film with 0.25 M precursor concentration showed the highest sensitivity. In order to optimize the operating temperature, the sensitivity of the sensor to 50 ppm NO2 gas was measured at different operating temperatures, from 50 to 200 °C. The gas sensitivity increased with an increase in operating temperature and achieved the maximum value at 150 °C, followed by a decrease in sensitivity with further increase of the operating temperature. The sensitivity was about 35 % for 50 ppm NO2 at 150 °C with rapid response time of 6 s. T90 and T10 recovery time was 97 s at this gas concentration.

A Novel Tungsten Trioxide Based Gas Sensor for Indoor Formaldehyde Detection

2021 ◽  
Vol 16 (3) ◽  
pp. 363-367
Author(s):  
Gaoqi Zhang ◽  
Fan Zhang ◽  
Kaifang Wang ◽  
Tao Tian ◽  
Shanyu Liu ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Gas Sensor ◽  
Indoor Air ◽  
Gas Sensing ◽  
X Ray Diffraction ◽  
X Ray ◽  
Sensing Material ◽  
Transmission Electron ◽  
Gas Sensing Properties ◽  
Gas Response

Accurate and real-time detection of formaldehyde (HCHO) in indoor air is urgently needed for human health. In this work, a ceramic material (WO3·H2O) with unique structure was successfully prepared using an efficient hydrothermal method. The crystallinity, morphology and microstructure of the as-prepared sensing material were analyzed by X-ray diffraction (XRD), field emission scanning electron microscope (FESEM) as well as transmission electron microscope (TEM). The characterization results suggest that the as-prepared sample is composed of square-like nanoplates with uneven surface. Formaldehyde vapor is utilized as the target gas to investigate gas sensing properties of the synthesized novel nanoplates. The testing results indicate that the as-fabricated gas sensor exhibit high gas response and excellent repeatability to HCHO gas. The response value (Ra/Rg) is 24.5 towards 70 ppm HCHO gas at 350 °C. Besides, the gas sensing mechanism was described.

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