Prominent reducing gas-sensing performances of n-SnO2 nanowires by local creation of p-n heterojunctions by functionalization with p-Cr2O3 nanoparticles

Sun Woo Choi; Akash Katoch; Jae Hun Kim; Sang Sub Kim

doi:10.1021/am504164j

Prominent reducing gas-sensing performances of n-SnO₂ nanowires by local creation of p-n heterojunctions by functionalization with p-Cr₂O₃ nanoparticles

Sun Woo Choi, Akash Katoch, Jae Hun Kim, Sang Sub Kim

Inha University

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

109 Scopus citations

Abstract

A novel approach to improving the reducing gas-sensing properties of n-type nanowires (NWs), by locally creating p-n heterojunctions with p-type nanoparticles (NPs), is proposed. As a model system, this work investigates the sensing behaviors of n-SnO₂ NWs functionalized with p-Cr₂O₃ NPs. Herein, n-SnO₂ NWs demonstrate greatly improved reducing gas-sensing performance when functionalized with p-Cr₂O₃ NPs. Conversely, such functionalization deteriorates the oxidizing gas-sensing properties of n-SnO₂ NWs. These phenomena are closely related to the local suppression of the conduction channel of n-type NWs, in the radial direction, beneath the p-n heterojunction by the flow of charge carriers. The approach used in this work can be used to fabricate sensitive reducing-gas sensors based on n-type NWs.

Original language	English
Pages (from-to)	17723-17729
Number of pages	7
Journal	ACS applied materials & interfaces
Volume	6
Issue number	20
DOIs	https://doi.org/10.1021/am504164j
State	Published - 22 Oct 2014

Bibliographical note

Publisher Copyright:
© 2014 American Chemical Society.

Keywords

CrO nanoparticle
electronic sensitization
gas sensor
sensing mechanism
SnO nanowire

Access to Document

10.1021/am504164j

Cite this

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title = "Prominent reducing gas-sensing performances of n-SnO2 nanowires by local creation of p-n heterojunctions by functionalization with p-Cr2O3 nanoparticles",

abstract = "A novel approach to improving the reducing gas-sensing properties of n-type nanowires (NWs), by locally creating p-n heterojunctions with p-type nanoparticles (NPs), is proposed. As a model system, this work investigates the sensing behaviors of n-SnO2 NWs functionalized with p-Cr2O3 NPs. Herein, n-SnO2 NWs demonstrate greatly improved reducing gas-sensing performance when functionalized with p-Cr2O3 NPs. Conversely, such functionalization deteriorates the oxidizing gas-sensing properties of n-SnO2 NWs. These phenomena are closely related to the local suppression of the conduction channel of n-type NWs, in the radial direction, beneath the p-n heterojunction by the flow of charge carriers. The approach used in this work can be used to fabricate sensitive reducing-gas sensors based on n-type NWs.",

keywords = "CrO nanoparticle, electronic sensitization, gas sensor, sensing mechanism, SnO nanowire",

author = "Choi, \{Sun Woo\} and Akash Katoch and Kim, \{Jae Hun\} and Kim, \{Sang Sub\}",

note = "Publisher Copyright: {\textcopyright} 2014 American Chemical Society.",

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AU - Choi, Sun Woo

AU - Katoch, Akash

AU - Kim, Jae Hun

AU - Kim, Sang Sub

PY - 2014/10/22

Y1 - 2014/10/22

N2 - A novel approach to improving the reducing gas-sensing properties of n-type nanowires (NWs), by locally creating p-n heterojunctions with p-type nanoparticles (NPs), is proposed. As a model system, this work investigates the sensing behaviors of n-SnO2 NWs functionalized with p-Cr2O3 NPs. Herein, n-SnO2 NWs demonstrate greatly improved reducing gas-sensing performance when functionalized with p-Cr2O3 NPs. Conversely, such functionalization deteriorates the oxidizing gas-sensing properties of n-SnO2 NWs. These phenomena are closely related to the local suppression of the conduction channel of n-type NWs, in the radial direction, beneath the p-n heterojunction by the flow of charge carriers. The approach used in this work can be used to fabricate sensitive reducing-gas sensors based on n-type NWs.

AB - A novel approach to improving the reducing gas-sensing properties of n-type nanowires (NWs), by locally creating p-n heterojunctions with p-type nanoparticles (NPs), is proposed. As a model system, this work investigates the sensing behaviors of n-SnO2 NWs functionalized with p-Cr2O3 NPs. Herein, n-SnO2 NWs demonstrate greatly improved reducing gas-sensing performance when functionalized with p-Cr2O3 NPs. Conversely, such functionalization deteriorates the oxidizing gas-sensing properties of n-SnO2 NWs. These phenomena are closely related to the local suppression of the conduction channel of n-type NWs, in the radial direction, beneath the p-n heterojunction by the flow of charge carriers. The approach used in this work can be used to fabricate sensitive reducing-gas sensors based on n-type NWs.

KW - CrO nanoparticle

KW - electronic sensitization

KW - gas sensor

KW - sensing mechanism

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