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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
Source PublicationJOURNAL OF PHYSICS D-APPLIED PHYSICS
ISSN0022-3727
Volume50Issue:11
Abstract

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.

KeywordGraphene Quantum Dots Si Nanowire Array Ultrasensitive Gas Detection
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/1361-6463/aa5a36
Indexed BySCI
Language英语
WOS KeywordPhotovoltaic Devices ; Hydrogen Generation ; Selective Detection ; Solar-cells ; Sensor ; Electroluminescence
WOS Research AreaPhysics
WOS SubjectPhysics, Applied
Funding OrganizationNational 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 IDWOS:000415250200002
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/23369
Collection多相复杂系统国家重点实验室
AffiliationChinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
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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