Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 5, Issue 10, Pages 4285-4292Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am400500a
Keywords
SnO2; ZnO; core/shell nanowires; gas sensor; UV irradiation
Funding
- Key Research Institute Program through the National Research Foundation of Korea (NRF)
- Ministry of Education, Science and Technology [2011-0018394]
- National Research Foundation of Korea [2010-0020163] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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SnO2-core/ZnO-shell nanowires were synthesized using a two-step process: the synthesis of SnO2 nanowires by the thermal evaporation of Sn powders followed by the atomic layer deposition of ZnO. The room temperature NO2 gas sensing properties of the nanowires under ultraviolet (UV) illumination were examined. The cores and shells of the nanowires were primitive tetragonal-structured single crystal SnO2 and wurtzite-structured single crystal ZnO, respectively. The responses of multiple networked SnO2 nanowire sensors were increased 2-3-fold at NO2 concentrations ranging from 1 to 5 ppm by encapsulating the nanowires with ZnO. The SnO2-core/ZnO-shell nanowire sensors showed a remarkably enhanced response under UV illumination. The sensing mechanism of the core/shell nanowires under UV illumination is also discussed.
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