Enhanced UV activation of electrochemically doped Ni in ZnO nanorods for room temperature acetone sensing

[Display omitted] ► Electrochemical doping of nickel ions into ZnO nanorods in aqueous solution. ► Enhanced room temperature sensing by nickel ions under UV illumination. ► ZnO nanostructures on flexible substrate by electrodeposition. We report the enhanced room temperature gas sensing properties o...

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Bibliographic Details
Published in:Chemical physics letters 2011-08, Vol.511 (4), p.331-335
Main Authors: Ahn, Hosang, Wang, Yaqi, Hyun Jee, Seung, Park, Minseo, Yoon, Young Soo, Kim, Dong-Joo
Format: Article
Language:English
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Summary:[Display omitted] ► Electrochemical doping of nickel ions into ZnO nanorods in aqueous solution. ► Enhanced room temperature sensing by nickel ions under UV illumination. ► ZnO nanostructures on flexible substrate by electrodeposition. We report the enhanced room temperature gas sensing properties of ZnO nanorods by promoting UV activation via doped Ni in ZnO. Electrodeposition was used to grow nickel-doped ZnO nanorods on flexible substrates integrated with 365 nm UV LED. Nickel concentration varied from 0 at.% to 10 at.% in aqueous solution. An enhanced gas sensing property up to 1.61 at room temperature was measured at 6 at.% Ni-doped ZnO, but showed deteriorated sensitivity due to the formation of a NiO phase at higher Ni concentration. The mechanism for improved sensing properties can be explained by the involvement of weakly bound photo-induced oxygen ions upon the exposure of acetone gas.
ISSN:0009-2614
1873-4448
DOI:10.1016/j.cplett.2011.06.045