Novel Α-Fe2O3/BiVO4 heterojunctions for enhancing NO2 sensing properties

Shouli Bai; Ke Tian; Hang Fu; Yongjun Feng; Ruixian Luo; Dianqing Li; Aifan Chen; Chung Chiun Liu

doi:10.1016/j.snb.2018.03.173

Novel Α-Fe₂O₃/BiVO₄ heterojunctions for enhancing NO₂ sensing properties

Shouli Bai
, Ke Tian
, Hang Fu
, Yongjun Feng
, Ruixian Luo
, Dianqing Li
, Aifan Chen
, Chung Chiun Liu

Graduate Institute of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

63 Scopus citations

Abstract

We report a novel composite of α-Fe₂O₃/BiVO₄ with n-n heterojunctions for the first time and application in detecting low concentration NO₂ gas. The flower-like α-Fe₂O₃ hierarchical nanostructures were prepared by the solvothermal method followed by BiVO₄ nanoparticles decorated on α-Fe₂O₃ surface by metal-organic decomposition to structure the heterojunctions of α-Fe₂O₃/BiVO₄. The structure and morphology of material were characterized and the sensing properties to NO₂ were examined. The results show that the α-Fe₂O₃/BiVO₄ composite (atomic ratio of 8:1:1 for Fe: Bi: V) to 2 ppm NO₂ exhibits a four times higher response than pristine α-Fe₂O₃ at 110 °C, excellent selectivity, and long-term stability. The enhanced sensing properties can be attributed to the porous hierarchical structure of composite and the formation of inner electronic field (IEF) caused by n-n heterojunction at interface between α-Fe₂O₃ and BiVO_4.

Original language	English
Pages (from-to)	136-143
Number of pages	8
Journal	Sensors and Actuators, B: Chemical
Volume	268
DOIs	https://doi.org/10.1016/j.snb.2018.03.173
State	Published - 1 Sep 2018

Keywords

NO sensor
n-n Heterojunction
α-FeO/BiVO composite

Access to Document

10.1016/j.snb.2018.03.173

Cite this

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title = "Novel Α-Fe2O3/BiVO4 heterojunctions for enhancing NO2 sensing properties",

abstract = "We report a novel composite of α-Fe2O3/BiVO4 with n-n heterojunctions for the first time and application in detecting low concentration NO2 gas. The flower-like α-Fe2O3 hierarchical nanostructures were prepared by the solvothermal method followed by BiVO4 nanoparticles decorated on α-Fe2O3 surface by metal-organic decomposition to structure the heterojunctions of α-Fe2O3/BiVO4. The structure and morphology of material were characterized and the sensing properties to NO2 were examined. The results show that the α-Fe2O3/BiVO4 composite (atomic ratio of 8:1:1 for Fe: Bi: V) to 2 ppm NO2 exhibits a four times higher response than pristine α-Fe2O3 at 110 °C, excellent selectivity, and long-term stability. The enhanced sensing properties can be attributed to the porous hierarchical structure of composite and the formation of inner electronic field (IEF) caused by n-n heterojunction at interface between α-Fe2O3 and BiVO4.",

keywords = "NO sensor, n-n Heterojunction, α-FeO/BiVO composite",

author = "Shouli Bai and Ke Tian and Hang Fu and Yongjun Feng and Ruixian Luo and Dianqing Li and Aifan Chen and Liu, \{Chung Chiun\}",

note = "Publisher Copyright: {\textcopyright} 2018",

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T1 - Novel Α-Fe2O3/BiVO4 heterojunctions for enhancing NO2 sensing properties

AU - Bai, Shouli

AU - Tian, Ke

AU - Fu, Hang

AU - Feng, Yongjun

AU - Luo, Ruixian

AU - Li, Dianqing

AU - Chen, Aifan

AU - Liu, Chung Chiun

PY - 2018/9/1

Y1 - 2018/9/1

N2 - We report a novel composite of α-Fe2O3/BiVO4 with n-n heterojunctions for the first time and application in detecting low concentration NO2 gas. The flower-like α-Fe2O3 hierarchical nanostructures were prepared by the solvothermal method followed by BiVO4 nanoparticles decorated on α-Fe2O3 surface by metal-organic decomposition to structure the heterojunctions of α-Fe2O3/BiVO4. The structure and morphology of material were characterized and the sensing properties to NO2 were examined. The results show that the α-Fe2O3/BiVO4 composite (atomic ratio of 8:1:1 for Fe: Bi: V) to 2 ppm NO2 exhibits a four times higher response than pristine α-Fe2O3 at 110 °C, excellent selectivity, and long-term stability. The enhanced sensing properties can be attributed to the porous hierarchical structure of composite and the formation of inner electronic field (IEF) caused by n-n heterojunction at interface between α-Fe2O3 and BiVO4.

AB - We report a novel composite of α-Fe2O3/BiVO4 with n-n heterojunctions for the first time and application in detecting low concentration NO2 gas. The flower-like α-Fe2O3 hierarchical nanostructures were prepared by the solvothermal method followed by BiVO4 nanoparticles decorated on α-Fe2O3 surface by metal-organic decomposition to structure the heterojunctions of α-Fe2O3/BiVO4. The structure and morphology of material were characterized and the sensing properties to NO2 were examined. The results show that the α-Fe2O3/BiVO4 composite (atomic ratio of 8:1:1 for Fe: Bi: V) to 2 ppm NO2 exhibits a four times higher response than pristine α-Fe2O3 at 110 °C, excellent selectivity, and long-term stability. The enhanced sensing properties can be attributed to the porous hierarchical structure of composite and the formation of inner electronic field (IEF) caused by n-n heterojunction at interface between α-Fe2O3 and BiVO4.

KW - NO sensor

KW - n-n Heterojunction

KW - α-FeO/BiVO composite

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U2 - 10.1016/j.snb.2018.03.173

DO - 10.1016/j.snb.2018.03.173

M3 - 期刊論文

AN - SCOPUS:85046134935

SN - 0925-4005

VL - 268

SP - 136

EP - 143

JO - Sensors and Actuators, B: Chemical

JF - Sensors and Actuators, B: Chemical