Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 3, Issue 7, Pages 2253-2258Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am200008y
Keywords
hierarchical structure; interface; visible-light irradiation; gas sensing
Funding
- National Basic Research Program of China (973 Program) [2007CB613303]
- National Natural Science Foundation of China [20673049, 20703020, 20873053]
- Science and Technology Developing Funding of Jilin Province [201115012]
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CdS nanowire/ZnO nanosphere materials (CdS/ZnO) with hierarchical structure were synthesized by a three-step solvothermal process. XRD, FESEM and TEM analysis confirmed the growth of ZnO nanospheres on the surface of CdS nanowires (NWs). The transient photovoltage (TPV) measurements revealed that the interface between CdS and ZnO can inhibit the recombination of photogenerated excess carriers and prolong the lifetime of excess carriers in CdS/ZnO materials. Moreover, the CdS/ZnO materials exhibit a dramatic improvement in optoelectronic performance and visible-light-irradiation gas sensing activity, which gave 1 order of magnitude larger than that of CdS NWs in response to formaldehyde. The enhancement of sensing properties is attributed to the interfacial transport of excess carriers.
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