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Understanding on the selective carbon monoxide sensing characteristics of copper oxide-zinc oxide composite thin films
- Source :
- Sensors and Actuators B: Chemical. 253:685-696
- Publication Year :
- 2017
- Publisher :
- Elsevier BV, 2017.
-
Abstract
- In the present work we have demonstrated CuO-ZnO composite thin film with optimized CuO content selectively sense carbon monoxide gas. The ānā-type gas sensing characteristics of these composite films are changed to āpā-type beyond 8.0 mol% CuO contents. Through the analyses of photoluminescence spectra in conjunction with XPS we have demonstrated that up to 33.0 mol% CuO contents the gas sensing characteristics of the composite films are controlled by the type of point defects (oxygen vacancies, zinc interstitials, and copper vacancies) in CuO and ZnO grains. We have hypothesized that these point defects help to chemi-absorb oxygen and CO preferentially on ZnO and CuO grains respectively to yield selective carbon monoxide sensing of ZnO-CuO composite film with 7.0 mol% CuO contents. Beyond 33.0 mol% CuO contents the effect of point defects diminishes and the gas sensing characteristic are grossly controlled by the nature of the CuO grains covering ZnO grains in the composite films. Our work provides comprehensive insight towards the understanding of the gas sensing characteristics of hetero-composite thin films deposited using a mixed precursor sol.
- Subjects :
- Copper oxide
Materials science
Photoluminescence
Inorganic chemistry
Composite number
chemistry.chemical_element
02 engineering and technology
Zinc
010402 general chemistry
01 natural sciences
chemistry.chemical_compound
X-ray photoelectron spectroscopy
Materials Chemistry
Electrical and Electronic Engineering
Thin film
Instrumentation
Metals and Alloys
021001 nanoscience & nanotechnology
Condensed Matter Physics
Copper
0104 chemical sciences
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
chemistry
0210 nano-technology
Carbon monoxide
Subjects
Details
- ISSN :
- 09254005
- Volume :
- 253
- Database :
- OpenAIRE
- Journal :
- Sensors and Actuators B: Chemical
- Accession number :
- edsair.doi...........b761e66e1d3fb51c42645189fcd614f7