Preparation of ZnO powders by hydrazine method and its sensitivity to C2H5OH
- Authors
- Kim, S.-J.; Lee, J.-H.
- Issue Date
- 2008
- Keywords
- Gas sensor; High sensitivity; Hydrazine reduction; ZnO
- Citation
- Korean Journal of Materials Research, v.18, no.11, pp.628 - 633
- Indexed
- SCOPUS
KCI
- Journal Title
- Korean Journal of Materials Research
- Volume
- 18
- Number
- 11
- Start Page
- 628
- End Page
- 633
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/125305
- DOI
- 10.3740/MRSK.2008.18.11.628
- ISSN
- 1225-0562
- Abstract
- ZnO nanopowders were synthesized by the sol-gel method using hydrazine reduction, and their gas responses to 6 gases (200 ppm of C2H5OH, CH3COCH3, H2, C3H8, 100 ppm of CO, and 5 ppm of NO2) were measured at 300 - 400°C. The prepared ZnO nanopowders showed high gas responses to C2H5OH and CH3COCH3 at 400°C. The sensing materials prepared at the compositions of [ZnCl2]: [N2H4]:[NaOH] = 1:1:1 and 1:2:2 showed particularly high gas responses (S = Ra/Rg, Ra: resistance in air, Rg: resistance in gas) to 200 ppm of C2H5OH(S = 102.8-160.7) and 200 ppm of CH3COCH3 (S = 72.6-166.2), while they showed low gas responses to H2, C3H8, CO, and NO2. The reason for high sensitivity to these 2 gases was discussed in relation to the reaction mechanism, oxidation state, surface area, and particle morphology of the sensing materials.
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