Synthesis and gas sensing characteristics of highly crystalline ZnO-SnO2 core-shell nanowires

In Sung Hwang; Sun Jung Kim; Joong Ki Choi; Jaewan Choi; Hyunjin Ji; Gyu-Tae Kim; Guozhong Cao; Jong Heun Lee

doi:10.1016/j.snb.2010.05.052

Synthesis and gas sensing characteristics of highly crystalline ZnO-SnO₂ core-shell nanowires

In Sung Hwang, Sun Jung Kim, Joong Ki Choi, Jaewan Choi, Hyunjin Ji, Gyu-Tae Kim, Guozhong Cao, Jong Heun Lee

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

186 Citations (Scopus)

Abstract

The ZnO-SnO₂ core-shell nanowires (NWs) were synthesized by a continuous two-step vapor growth method at different synthesis temperatures. A crystalline 15-20 nm-thick, SnO₂ shell layer was pseudo-epitaxially coated on ZnO NWs with a diameter of 50-80 nm. The gas response of the ZnO-SnO₂ core-shell NW sensor to 10 ppm NO₂ reached ∼33 times enhancement compared to that of the ZnO NWs at 200 °C. In addition, the ZnO-SnO₂ core-shell NW sensors showed selective detection to NO₂ at 200-300 °C and to C₂H ₅OH at 400 °C. The enhanced gas responses to NO₂ and C₂H₅OH are discussed in relation to the thin SnO ₂ shell layer and core-shell configuration of the NWs.

Original language	English
Pages (from-to)	595-600
Number of pages	6
Journal	Sensors and Actuators, B: Chemical
Volume	148
Issue number	2
DOIs	https://doi.org/10.1016/j.snb.2010.05.052
Publication status	Published - 2010 Jul 15

Keywords

CHOH sensor
Core-shell nanowires
Gas sensors
NO sensor
ZnO-SnO

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.2010.05.052

Cite this

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title = "Synthesis and gas sensing characteristics of highly crystalline ZnO-SnO2 core-shell nanowires",

abstract = "The ZnO-SnO2 core-shell nanowires (NWs) were synthesized by a continuous two-step vapor growth method at different synthesis temperatures. A crystalline 15-20 nm-thick, SnO2 shell layer was pseudo-epitaxially coated on ZnO NWs with a diameter of 50-80 nm. The gas response of the ZnO-SnO2 core-shell NW sensor to 10 ppm NO2 reached ∼33 times enhancement compared to that of the ZnO NWs at 200 °C. In addition, the ZnO-SnO2 core-shell NW sensors showed selective detection to NO2 at 200-300 °C and to C2H 5OH at 400 °C. The enhanced gas responses to NO2 and C2H5OH are discussed in relation to the thin SnO 2 shell layer and core-shell configuration of the NWs.",

keywords = "CHOH sensor, Core-shell nanowires, Gas sensors, NO sensor, ZnO-SnO",

author = "Hwang, {In Sung} and Kim, {Sun Jung} and Choi, {Joong Ki} and Jaewan Choi and Hyunjin Ji and Gyu-Tae Kim and Guozhong Cao and Lee, {Jong Heun}",

note = "Funding Information: This work was supported by KOSEF NRL Program grant funded by the Korean government (MEST) (No. R0A-2008-000-20032-0 ) and the Fundamental R&D program for Core Technology of Materials ( M2008010013 ) funded by the Ministry of Knowledge Economy. The work of G.T. Kim was supported by NRF funded by MEST (No. 2009-0083380 ). ",

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AU - Hwang, In Sung

AU - Kim, Sun Jung

AU - Choi, Joong Ki

AU - Choi, Jaewan

AU - Ji, Hyunjin

AU - Kim, Gyu-Tae

AU - Cao, Guozhong

AU - Lee, Jong Heun

N1 - Funding Information: This work was supported by KOSEF NRL Program grant funded by the Korean government (MEST) (No. R0A-2008-000-20032-0 ) and the Fundamental R&D program for Core Technology of Materials ( M2008010013 ) funded by the Ministry of Knowledge Economy. The work of G.T. Kim was supported by NRF funded by MEST (No. 2009-0083380 ).

PY - 2010/7/15

Y1 - 2010/7/15

N2 - The ZnO-SnO2 core-shell nanowires (NWs) were synthesized by a continuous two-step vapor growth method at different synthesis temperatures. A crystalline 15-20 nm-thick, SnO2 shell layer was pseudo-epitaxially coated on ZnO NWs with a diameter of 50-80 nm. The gas response of the ZnO-SnO2 core-shell NW sensor to 10 ppm NO2 reached ∼33 times enhancement compared to that of the ZnO NWs at 200 °C. In addition, the ZnO-SnO2 core-shell NW sensors showed selective detection to NO2 at 200-300 °C and to C2H 5OH at 400 °C. The enhanced gas responses to NO2 and C2H5OH are discussed in relation to the thin SnO 2 shell layer and core-shell configuration of the NWs.

AB - The ZnO-SnO2 core-shell nanowires (NWs) were synthesized by a continuous two-step vapor growth method at different synthesis temperatures. A crystalline 15-20 nm-thick, SnO2 shell layer was pseudo-epitaxially coated on ZnO NWs with a diameter of 50-80 nm. The gas response of the ZnO-SnO2 core-shell NW sensor to 10 ppm NO2 reached ∼33 times enhancement compared to that of the ZnO NWs at 200 °C. In addition, the ZnO-SnO2 core-shell NW sensors showed selective detection to NO2 at 200-300 °C and to C2H 5OH at 400 °C. The enhanced gas responses to NO2 and C2H5OH are discussed in relation to the thin SnO 2 shell layer and core-shell configuration of the NWs.

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