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Graphene quantum dots modified silicon nanowire array for ultrasensitive detection in the gas phase
Li, T. Y.; Duan, C. Y.; Zhu, Y. X.; Chen, Y. F.; Wang, Y.
2017-03-22
发表期刊JOURNAL OF PHYSICS D-APPLIED PHYSICS
ISSN0022-3727
卷号50期号:11
摘要Si nanostructure-based gas detectors have attracted much attention due to their huge surface areas, relatively high carrier mobility, maneuverability for surface functionalization and compatibility to modern electronic industry. However, the unstable surface of Si, especially for the nanostructures in a corrosive atmosphere, hinders their sensitivity and reproducibility when used for detection in the gas phase. In this study, we proposed a novel strategy to fabricate a Si-based gas detector by using the vertically aligned Si nanowire (SiNW) array as a skeleton and platform, and decorated chemically inert graphene quantum dots (GQDs) to protect the SiNWs from oxidation and promote the carriers' interaction with the analytes. The radial core-shell structures of the GQDs/SiNW array were then assembled into a resistor-based gas detection system and evaluated by using nitrogen dioxide (NO2) as the model analyte. Compared to the bare SiNW array, our novel sensor exhibited ultrahigh sensitivity for detecting trace amounts of NO2 with the concentration as low as 10 ppm in room temperature and an immensely reduced recovery time, which is of significant importance for their practical application. Meanwhile, strikingly, reproducibility and stability could also be achieved by showing no sensitivity decline after storing the GQDs/SiNW array in air for two weeks. Our results demonstrate that protecting the surface of the SiNW array with chemically inert GQDs is a feasible strategy to realize ultrasensitive detection in the gas phase.
关键词Graphene Quantum Dots Si Nanowire Array Ultrasensitive Gas Detection
文章类型Article
WOS标题词Science & Technology ; Physical Sciences
DOI10.1088/1361-6463/aa5a36
收录类别SCI
语种英语
关键词[WOS]PHOTOVOLTAIC DEVICES ; HYDROGEN GENERATION ; SELECTIVE DETECTION ; SOLAR-CELLS ; SENSOR ; ELECTROLUMINESCENCE
WOS研究方向Physics
WOS类目Physics, Applied
项目资助者National Natural Science Foundation of China(51503210) ; Chinese Academy of Sciences (CAS) ; State Key Laboratory of Multiphase Complex Systems Open Foundation(MPCS-2013-C-01)
WOS记录号WOS:000415250200002
引用统计
文献类型期刊论文
条目标识符http://ir.ipe.ac.cn/handle/122111/23369
专题多相复杂系统国家重点实验室
作者单位Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China
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Li, T. Y.,Duan, C. Y.,Zhu, Y. X.,et al. Graphene quantum dots modified silicon nanowire array for ultrasensitive detection in the gas phase[J]. JOURNAL OF PHYSICS D-APPLIED PHYSICS,2017,50(11).
APA Li, T. Y.,Duan, C. Y.,Zhu, Y. X.,Chen, Y. F.,&Wang, Y..(2017).Graphene quantum dots modified silicon nanowire array for ultrasensitive detection in the gas phase.JOURNAL OF PHYSICS D-APPLIED PHYSICS,50(11).
MLA Li, T. Y.,et al."Graphene quantum dots modified silicon nanowire array for ultrasensitive detection in the gas phase".JOURNAL OF PHYSICS D-APPLIED PHYSICS 50.11(2017).
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