Selective Detection of NO2 Using Cr-Doped CuO Nanorods

Kang Min Kim; Hyun Mook Jeong; Hae Ryong Kim; Kwon Il Choi; Hyo Joong Kim; Jong Heun Lee

doi:10.3390/s120608013

Selective Detection of NO₂ Using Cr-Doped CuO Nanorods

Kang Min Kim, Hyun Mook Jeong, Hae Ryong Kim, Kwon Il Choi, Hyo Joong Kim, Jong Heun Lee

Research output: Contribution to journal › Article

46 Citations (Scopus)

Abstract

CuO nanosheets, Cr-doped CuO nanosheets, and Cr-doped CuO nanorods were prepared by heating a slurry containing Cu-hydroxide/Cr-hydroxide. Their responses to 100 ppm NO₂, C₂H₅OH, NH₃, trimethylamine, C₃H₈, and CO were measured. For 2.2 at% Cr-doped CuO nanorods, the response (R_a/R_g, R_a: resistance in air, R_g: resistance in gas) to 100 ppm NO₂ was 134.2 at 250 °C, which was significantly higher than that of pure CuO nano-sheets (R_a/R_g = 7.5) and 0.76 at% Cr-doped CuO nanosheets (R_a/R_g = 19.9). In addition, the sensitivity for NO₂ was also markedly enhanced by Cr doping. Highly sensitive and selective detection of NO₂ in 2.2 at% Cr-doped CuO nanorods is explained in relation to Cr-doping induced changes in donor density, morphology, and catalytic effects.

Original language	English
Pages (from-to)	8013-8025
Number of pages	13
Journal	Sensors (Switzerland)
Volume	12
Issue number	6
DOIs	https://doi.org/10.3390/s120608013
Publication status	Published - 2012 Jun

Keywords

CrO
CuO
Gas sensor
Nanorods
Nanosheets
Nanostructures
P-type

ASJC Scopus subject areas

Analytical Chemistry
Biochemistry
Atomic and Molecular Physics, and Optics
Instrumentation
Electrical and Electronic Engineering

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Cite this

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title = "Selective Detection of NO2 Using Cr-Doped CuO Nanorods",

abstract = "CuO nanosheets, Cr-doped CuO nanosheets, and Cr-doped CuO nanorods were prepared by heating a slurry containing Cu-hydroxide/Cr-hydroxide. Their responses to 100 ppm NO2, C2H5OH, NH3, trimethylamine, C3H8, and CO were measured. For 2.2 at% Cr-doped CuO nanorods, the response (Ra/Rg, Ra: resistance in air, Rg: resistance in gas) to 100 ppm NO2 was 134.2 at 250 °C, which was significantly higher than that of pure CuO nano-sheets (Ra/Rg = 7.5) and 0.76 at% Cr-doped CuO nanosheets (Ra/Rg = 19.9). In addition, the sensitivity for NO2 was also markedly enhanced by Cr doping. Highly sensitive and selective detection of NO2 in 2.2 at% Cr-doped CuO nanorods is explained in relation to Cr-doping induced changes in donor density, morphology, and catalytic effects.",

keywords = "CrO, CuO, Gas sensor, Nanorods, Nanosheets, Nanostructures, P-type",

author = "Kim, {Kang Min} and Jeong, {Hyun Mook} and Kim, {Hae Ryong} and Choi, {Kwon Il} and Kim, {Hyo Joong} and Lee, {Jong Heun}",

year = "2012",

month = jun,

doi = "10.3390/s120608013",

language = "English",

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AU - Kim, Kang Min

AU - Jeong, Hyun Mook

AU - Kim, Hae Ryong

AU - Choi, Kwon Il

AU - Kim, Hyo Joong

AU - Lee, Jong Heun

PY - 2012/6

Y1 - 2012/6

N2 - CuO nanosheets, Cr-doped CuO nanosheets, and Cr-doped CuO nanorods were prepared by heating a slurry containing Cu-hydroxide/Cr-hydroxide. Their responses to 100 ppm NO2, C2H5OH, NH3, trimethylamine, C3H8, and CO were measured. For 2.2 at% Cr-doped CuO nanorods, the response (Ra/Rg, Ra: resistance in air, Rg: resistance in gas) to 100 ppm NO2 was 134.2 at 250 °C, which was significantly higher than that of pure CuO nano-sheets (Ra/Rg = 7.5) and 0.76 at% Cr-doped CuO nanosheets (Ra/Rg = 19.9). In addition, the sensitivity for NO2 was also markedly enhanced by Cr doping. Highly sensitive and selective detection of NO2 in 2.2 at% Cr-doped CuO nanorods is explained in relation to Cr-doping induced changes in donor density, morphology, and catalytic effects.

AB - CuO nanosheets, Cr-doped CuO nanosheets, and Cr-doped CuO nanorods were prepared by heating a slurry containing Cu-hydroxide/Cr-hydroxide. Their responses to 100 ppm NO2, C2H5OH, NH3, trimethylamine, C3H8, and CO were measured. For 2.2 at% Cr-doped CuO nanorods, the response (Ra/Rg, Ra: resistance in air, Rg: resistance in gas) to 100 ppm NO2 was 134.2 at 250 °C, which was significantly higher than that of pure CuO nano-sheets (Ra/Rg = 7.5) and 0.76 at% Cr-doped CuO nanosheets (Ra/Rg = 19.9). In addition, the sensitivity for NO2 was also markedly enhanced by Cr doping. Highly sensitive and selective detection of NO2 in 2.2 at% Cr-doped CuO nanorods is explained in relation to Cr-doping induced changes in donor density, morphology, and catalytic effects.

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KW - Nanosheets

KW - Nanostructures

KW - P-type

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