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题名: Mesoporous InN/In2O3 heterojunction with improved sensitivity and selectivity for room temperature NO2 gas sensing
作者: Qu, Fengdong1;  Lu, Honghong1;  Guarecuco, Rohiverth2;  Jiao, Yutong1;  Yang, Minghui1
关键词: InN/In2O3 ;  heterojunction ;  NO2 ;  room temperature ;  gas sensor
刊名: NANOTECHNOLOGY
发表日期: 2016-09-23
DOI: 10.1088/0957-4484/27/38/385501
卷: 27, 期:38
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Technology ;  Physical Sciences
类目[WOS]: Nanoscience & Nanotechnology ;  Materials Science, Multidisciplinary ;  Physics, Applied
研究领域[WOS]: Science & Technology - Other Topics ;  Materials Science ;  Physics
英文摘要: Establishing heterostructures is a good strategy to improve gas sensing performance, and has been studied extensively. In this work, mesoporous InN/In2O3 composite (InNOCs) heterostructures were prepared through a simple two-step strategy involving hydrothermal synthesis of In2O3 and subsequent nitriding into InN-composite In2O3 heterostructures. We found that the InN content has great influence on the resistance of InNOCs, and thus, the gas sensing performance. In particular, InNOC-36.9 (with InN content of 36.9% in the composites) shows an excellent sensing response towards different concentrations of NO2, as well as good stability after one week of exposure to 200 ppb NO2 at room temperature. The highest sensing response (Delta R/R-0) is up to 1.8 for the low NO2 concentration of 5 ppb. Even more significantly, the theoretical limit of detection (LOD) of the InNOC-36.9 sensor is 31.7 ppt based on a signal-to- noise ratio of 3 (the measured LOD is 5 ppb), which is far below the US NAAQS. value (NO2: 53 ppb). In addition, a rational band structure model combined with a surface reaction model is proposed to explain the sensing mechanism.
关键词[WOS]: SOLAR-CELLS ;  OPTICAL-PROPERTIES ;  GRAPHENE OXIDE ;  SENSORS ;  INDIUM ;  LAYER ;  PERFORMANCE ;  NANOWIRES ;  ARRAYS ;  NANOPARTICLES
语种: 英语
WOS记录号: WOS:000400056900001
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/151959
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China
2.MIT, Dept Chem Engn, Cambridge, MA 02139 USA

Recommended Citation:
Qu, Fengdong,Lu, Honghong,Guarecuco, Rohiverth,et al. Mesoporous InN/In2O3 heterojunction with improved sensitivity and selectivity for room temperature NO2 gas sensing[J]. NANOTECHNOLOGY,2016,27(38).
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