Journal
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
Volume 210, Issue 6, Pages 1213-1216Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssa.201228664
Keywords
CuO; gas sensors; heterojunctions; nanoparticles; nanorods; ZnO
Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF)
- Ministry of Education, Science and Technology [2010-0010296]
- National Research Foundation of Korea [2010-0010296] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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A novel and highly sensitive p-n heterojunction sensor composed of zero-dimensional (0D) CuO nanoparticles (NPs) and one-dimensional (1D) ZnO nanorods (NRs) was fabricated using a solution-based process. The structures were characterized with scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The formation of electron depletion layers in the p-CuO and n-ZnO is believed to increase the adsorption of NO2, resulting in a 6-fold response improvement and a 13-fold increased sensitivity compared to ZnO NRs alone. We believe that this type of heterojunction device can be applied to many different sensing applications.
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