Dual Functional Sensing Mechanism in SnO2-ZnO Core-Shell Nanowires

Title
Dual Functional Sensing Mechanism in SnO2-ZnO Core-Shell Nanowires
Author(s)
김수현정재훈최선우[최선우]Akash Katoch[Akash Katoch]Gun-Joo Sun[Gun-Joo Sun]김상섭[김상섭]
Keywords
PHOTOCATALYTIC ACTIVITY; GAS SENSORS; NANOPARTICLES; PERFORMANCE; NANOFIBERS; MODULATION
Issue Date
201406
Publisher
AMER CHEMICAL SOC
Citation
ACS APPLIED MATERIALS & INTERFACES, v.6, no.11, pp.8281 - 8287
Abstract
We report a dual functional sensing mechanism for ultrasensitive chemoresistive sensors based on SnO2-ZnO core shell nanowires (C-S NWs) for detection of trace amounts of reducing gases. C S NWs were synthesized by a two-step process, in which core SnO2 nanowires were first prepared by vapor liquid solid growth and ZnO shell layers were subsequently deposited by atomic layer deposition. The radial modulation of the electron-depleted shell layer was accomplished by controlling its thickness. The sensing capabilities of C S NWs were investigated in terms of CO, which is a typical reducing gas. At an optimized shell thickness, C S NWs showed the best CO sensing ability, which was quite superior to that of pure SnO2 nanowires without a shell. The dual functional sensing mechanism is proposed as the sensing mechanism in these nanowires and is based on the combination of the radial modulation effect of the electron-depleted shell and the electric field smearing effect.
URI
http://hdl.handle.net/YU.REPOSITORY/32070http://dx.doi.org/10.1021/am501107c
ISSN
1944-8244
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공과대학 > 신소재공학부 > Articles
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