Porous, n–p type ultra-long, ZnO@Bi2O3 heterojunction nanorods - based NO2 gas sensor: new insights towards charge transport characteristics

2020 ◽  
Vol 22 (14) ◽  
pp. 7524-7536 ◽  
Author(s):  
Vishnuraj Ramakrishnan ◽  
Keerthi G. Nair ◽  
Jayaseelan Dhakshinamoorthy ◽  
K. R. Ravi ◽  
Biji Pullithadathil
Keyword(s):  
Charge Transport ◽  
Gas Sensor ◽  
Gas Sensing ◽  
Solvothermal Method ◽  
Sensing Properties ◽  
No2 Gas Sensor ◽  
Gas Sensing Properties ◽  
P Type

Porous n–p type ultra-long ZnO@Bi2O3 heterojunction nanorods have been synthesized through a solvothermal method and their complex charge transport characteristics pertaining to NO2 gas sensing properties have been investigated.

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

scholarly journals Preparation of Nanostructured SnO2-NiO Composite Semiconductor for Gas Sensor Applications

2021 ◽  
pp. 391-403
Author(s):  
S. Kumar ◽  
P. Gowthaman ◽  
J. Deenathayalan
Keyword(s):  
Gas Sensor ◽  
Composite Nanofibers ◽  
Volume Fraction ◽  
Gas Sensing ◽  
Precipitation Method ◽  
Response Sensitivity ◽  
X Ray ◽  
Sensing Properties ◽  
Working Temperature ◽  
Gas Sensing Properties

Electro spinning technology combined with chemical precipitation method and high-temperature calcination was used to prepare SnO2-NiO composite semiconductor nanofibers with different Sn content. Scanning electron microscope (SEM), X-ray diffractometer (XRD) and energy dispersive X-ray spectrometer (EDS) were used to characterize the morphology, structure and content of various elements of the sample. Using ethanol as the target gas, the gas sensing properties of SnO2-NiO nanofibers and the influence of Sn content on the gas sensing properties of composite nanofibers were explored. The research results show that SnO2-NiO composite nanofibers have a three-dimensional network structure, and the SnO2 composite can significantly enhance the gas sensitivity of NiO nanofibers. With increase of SnO2 content, the response sensitivity of composite fibers to ethanol gas increases, and the response sensitivity of composite nanofibers with the highest response to ethanol gas with a volume fraction of 100×10-6 at the optimal working temperature of 160℃ are13.4;It is 8.38 times the maximum response sensitivity of NiO nanofibers. Compared with the common ethanol gas sensor MQ-3 on the market, SnO2-NiO composite nanofibers have a lower optimal working temperature and higher response sensitivity, which has certain practical application value

UV enhanced NO gas sensing properties of the MoS2 monolayer gas sensor

2019 ◽  
Vol 6 (8) ◽  
pp. 085075 ◽  
Author(s):  
S Ramu ◽  
T Chandrakalavathi ◽  
G Murali ◽  
K Sunil Kumar ◽  
A Sudharani ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Gas Sensing ◽  
Sensing Properties ◽  
Mos2 Monolayer ◽  
Gas Sensing Properties

Gas‐Sensing Properties of Th / SnO2 Thin‐Film Gas Sensor to Trimethylamine

1999 ◽  
Vol 146 (9) ◽  
pp. 3536-3537 ◽  
Author(s):  
P. H. Wei ◽  
G. B. Li ◽  
S. Y. Zhao ◽  
L. R. Chen
Keyword(s):  
Thin Film ◽  
Gas Sensor ◽  
Gas Sensing ◽  
Sno2 Thin Film ◽  
Sensing Properties ◽  
Gas Sensing Properties

scholarly journals Discriminable Sensing Response Behavior to Homogeneous Gases Based on n-ZnO/p-NiO Composites

Nanomaterials ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 785 ◽  
Author(s):  
Wen-Dong Zhou ◽  
Davoud Dastan ◽  
Jing Li ◽  
Xi-Tao Yin ◽  
Qi Wang
Keyword(s):  
Gas Sensors ◽  
Gas Sensing ◽  
Sol Gel ◽  
High Sensitivity ◽  
Oxide Semiconductor ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
P Type ◽  
Type Response ◽  
Properties Of Composites

Metal oxide semiconductor (MOS) gas sensors have the advantages of high sensitivity, short response-recovery time and long-term stability. However, the shortcoming of poor discriminability of homogeneous gases limits their applications in gas sensors. It is well-known that the MOS materials have similar gas sensing responses to homogeneous gases such as CO and H2, so it is difficult for these gas sensors to distinguish the two gases. In this paper, simple sol–gel method was employed to obtain the ZnO–xNiO composites. Gas sensing performance results illustrated that the gas sensing properties of composites with x > 0.425 showed a p-type response to both CO and H2, while the gas sensing properties of composites with x < 0.425 showed an n-type response to both CO and H2. However, it was interesting that ZnO–0.425NiO showed a p-type response to CO but an discriminable response (n-type) to H2, which indicated that modulating the p-type or n-type semiconductor concentration in p-n composites could be an effective method with which to improve the discriminability of this type of gas sensor regarding CO and H2. The phenomenon of the special gas sensing behavior of ZnO–0.425NiO was explained based on the experimental observations and a range of characterization techniques, including XRD, HRTEM and XPS, in detail.

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