Highly sensitive C 2H 5OH sensors using Fe-doped NiO hollow spheres

Hyo Joong Kim; Kwon Il Choi; Kang Min Kim; Chan Woong Na; Jong Heun Lee

doi:10.1016/j.snb.2012.06.029

Highly sensitive C ₂H ₅OH sensors using Fe-doped NiO hollow spheres

Hyo Joong Kim, Kwon Il Choi, Kang Min Kim, Chan Woong Na, Jong Heun Lee

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

120 Citations (Scopus)

Abstract

NiO and Fe-doped NiO hollow spheres with the shell thickness of ∼12 nm have been prepared by applying uniform coatings of Ni- and Fe-precursors onto Ni spheres, partial oxidation of Ni spheres near their surfaces at 300 °C, the dissolution of core Ni using dilute HCl aqueous solution, and subsequent heat treatment at 500 °C, and their gas sensing characteristics at 300-400 °C were compared. The response to 100 ppm C ₂H ₅OH of Fe-doped NiO hollow spheres at 350 °C (R _g/R _a = 172.5; R _g, resistance in gas; R _a, resistance in air) was 31.4 times higher than that of NiO hollow spheres (R _g/R _a = 5.5). The reasons for the significant enhancement of C ₂H ₅OH response by doping Fe into NiO hollow spheres were discussed in relation to the incorporation of Fe components into the NiO lattice and their consequent impact on the gas sensing reaction.

Original language	English
Pages (from-to)	1029-1037
Number of pages	9
Journal	Sensors and Actuators, B: Chemical
Volume	171-172
DOIs	https://doi.org/10.1016/j.snb.2012.06.029
Publication status	Published - 2012 Aug

Keywords

Fe doping
Gas sensors
Hollow spheres
NiO
p-Type semiconductors

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Instrumentation
Condensed Matter Physics
Surfaces, Coatings and Films
Metals and Alloys
Electrical and Electronic Engineering
Materials Chemistry

Access to Document

10.1016/j.snb.2012.06.029

Cite this

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title = "Highly sensitive C 2H 5OH sensors using Fe-doped NiO hollow spheres",

abstract = "NiO and Fe-doped NiO hollow spheres with the shell thickness of ∼12 nm have been prepared by applying uniform coatings of Ni- and Fe-precursors onto Ni spheres, partial oxidation of Ni spheres near their surfaces at 300 °C, the dissolution of core Ni using dilute HCl aqueous solution, and subsequent heat treatment at 500 °C, and their gas sensing characteristics at 300-400 °C were compared. The response to 100 ppm C 2H 5OH of Fe-doped NiO hollow spheres at 350 °C (R g/R a = 172.5; R g, resistance in gas; R a, resistance in air) was 31.4 times higher than that of NiO hollow spheres (R g/R a = 5.5). The reasons for the significant enhancement of C 2H 5OH response by doping Fe into NiO hollow spheres were discussed in relation to the incorporation of Fe components into the NiO lattice and their consequent impact on the gas sensing reaction.",

keywords = "Fe doping, Gas sensors, Hollow spheres, NiO, p-Type semiconductors",

author = "Kim, {Hyo Joong} and Choi, {Kwon Il} and Kim, {Kang Min} and Na, {Chan Woong} and Lee, {Jong Heun}",

note = "Funding Information: This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (No. R0A-2008-000-20032-0 ). Copyright: Copyright 2012 Elsevier B.V., All rights reserved.",

year = "2012",

month = aug,

doi = "10.1016/j.snb.2012.06.029",

language = "English",

volume = "171-172",

pages = "1029--1037",

journal = "Sensors and Actuators, B: Chemical",

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AU - Kim, Hyo Joong

AU - Choi, Kwon Il

AU - Kim, Kang Min

AU - Na, Chan Woong

AU - Lee, Jong Heun

N1 - Funding Information: This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (No. R0A-2008-000-20032-0 ). Copyright: Copyright 2012 Elsevier B.V., All rights reserved.

PY - 2012/8

Y1 - 2012/8

N2 - NiO and Fe-doped NiO hollow spheres with the shell thickness of ∼12 nm have been prepared by applying uniform coatings of Ni- and Fe-precursors onto Ni spheres, partial oxidation of Ni spheres near their surfaces at 300 °C, the dissolution of core Ni using dilute HCl aqueous solution, and subsequent heat treatment at 500 °C, and their gas sensing characteristics at 300-400 °C were compared. The response to 100 ppm C 2H 5OH of Fe-doped NiO hollow spheres at 350 °C (R g/R a = 172.5; R g, resistance in gas; R a, resistance in air) was 31.4 times higher than that of NiO hollow spheres (R g/R a = 5.5). The reasons for the significant enhancement of C 2H 5OH response by doping Fe into NiO hollow spheres were discussed in relation to the incorporation of Fe components into the NiO lattice and their consequent impact on the gas sensing reaction.

AB - NiO and Fe-doped NiO hollow spheres with the shell thickness of ∼12 nm have been prepared by applying uniform coatings of Ni- and Fe-precursors onto Ni spheres, partial oxidation of Ni spheres near their surfaces at 300 °C, the dissolution of core Ni using dilute HCl aqueous solution, and subsequent heat treatment at 500 °C, and their gas sensing characteristics at 300-400 °C were compared. The response to 100 ppm C 2H 5OH of Fe-doped NiO hollow spheres at 350 °C (R g/R a = 172.5; R g, resistance in gas; R a, resistance in air) was 31.4 times higher than that of NiO hollow spheres (R g/R a = 5.5). The reasons for the significant enhancement of C 2H 5OH response by doping Fe into NiO hollow spheres were discussed in relation to the incorporation of Fe components into the NiO lattice and their consequent impact on the gas sensing reaction.

KW - Fe doping

KW - Gas sensors

KW - Hollow spheres

KW - NiO

KW - p-Type semiconductors

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