Microstructure and gas sensing properties of solution precursor plasma-sprayed zinc oxide coatings
Source abstract
Abstract
Abstract ZnO nanostructured coatings have been prepared on Al2O3 substrates fitted with interdigitated Au electrodes on one side and a Pt heater on the other side, and explored as a gas sensor. The coatings were deposited by solution precursor plasma spray (SPPS) using zinc acetate Zn(CH3COO)2 aqueous solution as solution precursor. The SPPS process has proven its simplicity and reliability in fabricating polycrystalline ZnO coatings as verified by XRD structural analysis. The FE-SEM images confirmed that the coatings are nanostructured with grain size ranging from 50 to 100 nm. The surface morphology and coating grain size is influenced by the H2 gas flow rate in plasma forming gas. The properties of the sensors based on the SPPS ZnO coatings towards NO2 as well as other hazardous gases were characterized and the sensors showed good sensitivity to NO2 gas in sub-ppm range. The influence of gas humidity on sensor responses was also studied.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Gas Sensing Nanomaterials and Sensors · ZnO doping and properties · Analytical Chemistry and Sensors
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (19)
Show source-provided references
1. Conduction Model of metal oxide gas sensors10.1023/A:1014405811371 ↗
2. NOx sensors based on semiconducting metal oxide nanostructures: progress and perspectives10.1016/j.snb.2012.05.026 ↗
3. The role of morphology and crystallographic structure of metal oxides in response of conductometric-type gas sensors10.1016/j.mser.2008.02.001 ↗
4. A comparative study on surface morphological investigations of ferric oxide for LPG and opto-electronic humidity10.1016/j.apsusc.2012.05.091 ↗
5. Solid‐state gas sensors: a review10.1149/1.2069145 ↗
6. Sensing performances of ZnO nanostructures grown under different oxygen pressures to hydrogen10.1016/j.materresbull.2012.09.037 ↗
7. Sensing devices based on ZnO hexagonal tube-like nanostructures grown on p-GaN heterojunction by wet thermal evaporation10.1016/j.tsf.2013.05.091 ↗
8. Nanostructured zinc oxide films synthesized by successive chemical solution deposition for gas sensor applications10.1016/j.materresbull.2008.04.006 ↗
9. Plasma spray synthesis of nanomaterial powders and deposits10.1016/S0921-5093(96)10568-2 ↗
10. Parameters controlling liquid plasma spraying: solutions sols or suspensions10.1007/s11666-007-9152-2 ↗
11. Deposition and microstructure characterization of atmospheric plasma-sprayed ZnO coatings for NO2 detection10.1016/j.apsusc.2010.03.072 ↗
12. Necked ZnO nanoparticle-based NO2 sensors with high and fast response10.1016/j.snb.2009.05.019 ↗
13. The effect of humidity on tin-oxide thick-film gas sensors in the presence of reducing and combustible gases10.1016/0925-4005(95)85105-4 ↗
14. Vertical ZnO nanorod array as an effective hydrogen gas sensor10.1016/j.ceramint.2012.06.035 ↗
15. Sensing mechanism of hydrogen gas sensor based on RF-sputtered ZnO thin films10.1016/j.ijhydene.2010.02.006 ↗
16. Preparation of ZnO nanorods by microemulsion synthesis and their application as a CO gas sensor10.1016/j.snb.2011.07.018 ↗
17. On-chip growth of wafer-scale planar-type ZnO nanorod sensors for effective detection of CO gas10.1016/j.snb.2013.02.047 ↗
18. In situ growth of ZnO nanowires on Zn comb-shaped interdigitating electrodes and their photosensitive and gas-sensing characteristics10.1016/j.materresbull.2012.08.040 ↗
19. Hierarchically assembled porous ZnO microstructures and applications in a gas sensor10.1016/j.spmi.2011.01.001 ↗