scholarly journals Metal Oxide Based Heterojunctions for Gas Sensors: A Review

Nanomaterials ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 1026
Author(s):  
Shulin Yang ◽  
Gui Lei ◽  
Huoxi Xu ◽  
Zhigao Lan ◽  
Zhao Wang ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Metal Oxides ◽  
Gas Sensing ◽  
Response Times ◽  
Chemical Vapour ◽  
Pure Metal ◽  
Main Emphasis ◽  
Nanostructured Metal Oxides ◽  
Nanostructured Metal ◽  
Sensing Performance

The construction of heterojunctions has been widely applied to improve the gas sensing performance of composites composed of nanostructured metal oxides. This review summarises the recent progress on assembly methods and gas sensing behaviours of sensors based on nanostructured metal oxide heterojunctions. Various methods, including the hydrothermal method, electrospinning and chemical vapour deposition, have been successfully employed to establish metal oxide heterojunctions in the sensing materials. The sensors composed with the built nanostructured heterojunctions were found to show enhanced gas sensing performance with higher sensor responses and shorter response times to the targeted reducing or oxidising gases compare with those of the pure metal oxides. Moreover, the enhanced gas sensing mechanisms of the metal oxide-based heterojunctions to the reducing or oxidising gases are also discussed, with the main emphasis on the important role of the potential barrier on the accumulation layer.

Nanostructured metal oxides synthesized by hard template method for gas sensing applications

2005 ◽  
Vol 109 (1) ◽  
pp. 57-63 ◽  
Author(s):  
E. Rossinyol ◽  
J. Arbiol ◽  
F. Peiró ◽  
A. Cornet ◽  
J.R. Morante ◽  
...  
Keyword(s):  
Metal Oxides ◽  
Gas Sensing ◽  
Template Method ◽  
Hard Template ◽  
Sensing Applications ◽  
Nanostructured Metal Oxides ◽  
Hard Template Method ◽  
Nanostructured Metal

scholarly journals Transforming Pt-SnO2 Nanoparticles into Pt-SnO2 Composite Nanoceramics for Room-Temperature Hydrogen-Sensing Applications

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2123
Author(s):  
Ming Liu ◽  
Caochuang Wang ◽  
Pengcheng Li ◽  
Liang Cheng ◽  
Yongming Hu ◽  
...  
Keyword(s):  
Room Temperature ◽  
Gas Sensing ◽  
Sintering Temperature ◽  
Sno2 Nanoparticles ◽  
Hydrogen Sensing ◽  
Sensing Applications ◽  
Nanostructured Metal Oxides ◽  
Low Dimensional ◽  
Sensing Characteristics ◽  
Nanostructured Metal

Many low-dimensional nanostructured metal oxides (MOXs) with impressive room-temperature gas-sensing characteristics have been synthesized, yet transforming them into relatively robust bulk materials has been quite neglected. Pt-decorated SnO2 nanoparticles with 0.25–2.5 wt% Pt were prepared, and highly attractive room-temperature hydrogen-sensing characteristics were observed for them all through pressing them into pellets. Some pressed pellets were further sintered over a wide temperature range of 600–1200 °C. Though the room-temperature hydrogen-sensing characteristics were greatly degraded in many samples after sintering, those samples with 0.25 wt% Pt and sintered at 800 °C exhibited impressive room-temperature hydrogen-sensing characteristics comparable to those of their counterparts of as-pressed pellets. The variation of room-temperature hydrogen-sensing characteristics among the samples was explained by the facts that the connectivity between SnO2 grains increases with increasing sintering temperature, and Pt promotes oxidation of SnO2 at high temperatures. These results clearly demonstrate that some low-dimensional MOX nanocrystals can be successfully transformed into bulk MOXs with improved robustness and comparable room-temperature gas-sensing characteristics.

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