Mesoporous InN/In2O3 heterojunction with improved sensitivity and selectivity for room temperature NO2 gas sensing

	Mesoporous InN/In2O3 heterojunction with improved sensitivity and selectivity for room temperature NO2 gas sensing
	Jiao, Yutong 1; Qu, Fengdong 1; Lu, Honghong 1; Guarecuco, Rohiverth 2; Yang, Minghui 1
刊名	NANOTECHNOLOGY
	2016-09-23
卷号	27 期号:38
关键词	InN/In2O3 heterojunction NO2 room temperature gas sensor
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.
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
关键词[WOS]	SOLAR-CELLS ; OPTICAL-PROPERTIES ; GRAPHENE OXIDE ; SENSORS ; INDIUM ; LAYER ; PERFORMANCE ; NANOWIRES ; ARRAYS ; NANOPARTICLES
收录类别	SCI
语种	英语
WOS记录号	WOS:000400056900001
内容类型	期刊论文
源URL	[http://cas-ir.dicp.ac.cn/handle/321008/151959]
专题	大连化学物理研究所_中国科学院大连化学物理研究所
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
推荐引用方式 GB/T 7714	Jiao, Yutong,Qu, Fengdong,Lu, Honghong,et al. Mesoporous InN/In2O3 heterojunction with improved sensitivity and selectivity for room temperature NO2 gas sensing[J]. NANOTECHNOLOGY,2016,27(38).
APA	Jiao, Yutong,Qu, Fengdong,Lu, Honghong,Guarecuco, Rohiverth,&Yang, Minghui.(2016).Mesoporous InN/In2O3 heterojunction with improved sensitivity and selectivity for room temperature NO2 gas sensing.NANOTECHNOLOGY,27(38).
MLA	Jiao, Yutong,et al."Mesoporous InN/In2O3 heterojunction with improved sensitivity and selectivity for room temperature NO2 gas sensing".NANOTECHNOLOGY 27.38(2016).