Microstructure and CO gas sensing property of Au/SnO 2 core-shell structure nanoparticles synthesized by precipitation method and microwave-assisted hydrothermal synthesis method

T. Yanagimoto, Y. T. Yu, Kenji Kaneko

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

Au/SnO 2 core-shell structure NPs were prepared by a precipitation method and a microwave hydrothermal synthesis method, and their CO responses were measured by a high resistance meter. It was found that the CO response of the sample prepared by the precipitation method was extremely low, 0.18, with comparison to the one by the hydrothermal synthesis method, 0.965. Microstructures achieved by two-dimensional TEM characterization showed that both samples maintained the similar core-shell structures with their sizes ranging between 30 and 50 nm, as the core consists of Au NP and the shell consists of SnO 2 NPs. The average grain sizes of SnO 2 NPs of precipitation method and hydrothermal synthesis method were measured as 5.2 nm and 8.3 nm, respectively. The thickness and the porosity variation of SnO 2-shell layers were characterized further by three-dimensional electron tomography, and correlated with the sensing properties. It was found that the porosity within SnO 2-shell layers prepared by the precipitation method was lower than the one prepared by the hydrothermal synthesis method. Since Au NP could act as the catalyst for CO oxidation reaction, high porosity within SnO 2-shell layers would have lead the accessibilities of Au NP to the CO gas molecules and resulted high CO responses.

Original languageEnglish
Pages (from-to)31-35
Number of pages5
JournalSensors and Actuators, B: Chemical
Volume166-167
DOIs
Publication statusPublished - May 20 2012

Fingerprint

Hydrothermal synthesis
Carbon Monoxide
Gases
Microwaves
Nanoparticles
microwaves
nanoparticles
microstructure
Microstructure
Porosity
synthesis
porosity
gases
high resistance
Tomography
tomography
grain size
Transmission electron microscopy
catalysts
Oxidation

All Science Journal Classification (ASJC) codes

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

Cite this

@article{a6a961c9e3724b2c82acd76214dee228,
title = "Microstructure and CO gas sensing property of Au/SnO 2 core-shell structure nanoparticles synthesized by precipitation method and microwave-assisted hydrothermal synthesis method",
abstract = "Au/SnO 2 core-shell structure NPs were prepared by a precipitation method and a microwave hydrothermal synthesis method, and their CO responses were measured by a high resistance meter. It was found that the CO response of the sample prepared by the precipitation method was extremely low, 0.18, with comparison to the one by the hydrothermal synthesis method, 0.965. Microstructures achieved by two-dimensional TEM characterization showed that both samples maintained the similar core-shell structures with their sizes ranging between 30 and 50 nm, as the core consists of Au NP and the shell consists of SnO 2 NPs. The average grain sizes of SnO 2 NPs of precipitation method and hydrothermal synthesis method were measured as 5.2 nm and 8.3 nm, respectively. The thickness and the porosity variation of SnO 2-shell layers were characterized further by three-dimensional electron tomography, and correlated with the sensing properties. It was found that the porosity within SnO 2-shell layers prepared by the precipitation method was lower than the one prepared by the hydrothermal synthesis method. Since Au NP could act as the catalyst for CO oxidation reaction, high porosity within SnO 2-shell layers would have lead the accessibilities of Au NP to the CO gas molecules and resulted high CO responses.",
author = "T. Yanagimoto and Yu, {Y. T.} and Kenji Kaneko",
year = "2012",
month = "5",
day = "20",
doi = "10.1016/j.snb.2011.11.047",
language = "English",
volume = "166-167",
pages = "31--35",
journal = "Sensors and Actuators, B: Chemical",
issn = "0925-4005",
publisher = "Elsevier",

}

TY - JOUR

T1 - Microstructure and CO gas sensing property of Au/SnO 2 core-shell structure nanoparticles synthesized by precipitation method and microwave-assisted hydrothermal synthesis method

AU - Yanagimoto, T.

AU - Yu, Y. T.

AU - Kaneko, Kenji

PY - 2012/5/20

Y1 - 2012/5/20

N2 - Au/SnO 2 core-shell structure NPs were prepared by a precipitation method and a microwave hydrothermal synthesis method, and their CO responses were measured by a high resistance meter. It was found that the CO response of the sample prepared by the precipitation method was extremely low, 0.18, with comparison to the one by the hydrothermal synthesis method, 0.965. Microstructures achieved by two-dimensional TEM characterization showed that both samples maintained the similar core-shell structures with their sizes ranging between 30 and 50 nm, as the core consists of Au NP and the shell consists of SnO 2 NPs. The average grain sizes of SnO 2 NPs of precipitation method and hydrothermal synthesis method were measured as 5.2 nm and 8.3 nm, respectively. The thickness and the porosity variation of SnO 2-shell layers were characterized further by three-dimensional electron tomography, and correlated with the sensing properties. It was found that the porosity within SnO 2-shell layers prepared by the precipitation method was lower than the one prepared by the hydrothermal synthesis method. Since Au NP could act as the catalyst for CO oxidation reaction, high porosity within SnO 2-shell layers would have lead the accessibilities of Au NP to the CO gas molecules and resulted high CO responses.

AB - Au/SnO 2 core-shell structure NPs were prepared by a precipitation method and a microwave hydrothermal synthesis method, and their CO responses were measured by a high resistance meter. It was found that the CO response of the sample prepared by the precipitation method was extremely low, 0.18, with comparison to the one by the hydrothermal synthesis method, 0.965. Microstructures achieved by two-dimensional TEM characterization showed that both samples maintained the similar core-shell structures with their sizes ranging between 30 and 50 nm, as the core consists of Au NP and the shell consists of SnO 2 NPs. The average grain sizes of SnO 2 NPs of precipitation method and hydrothermal synthesis method were measured as 5.2 nm and 8.3 nm, respectively. The thickness and the porosity variation of SnO 2-shell layers were characterized further by three-dimensional electron tomography, and correlated with the sensing properties. It was found that the porosity within SnO 2-shell layers prepared by the precipitation method was lower than the one prepared by the hydrothermal synthesis method. Since Au NP could act as the catalyst for CO oxidation reaction, high porosity within SnO 2-shell layers would have lead the accessibilities of Au NP to the CO gas molecules and resulted high CO responses.

UR - http://www.scopus.com/inward/record.url?scp=84861196844&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84861196844&partnerID=8YFLogxK

U2 - 10.1016/j.snb.2011.11.047

DO - 10.1016/j.snb.2011.11.047

M3 - Article

AN - SCOPUS:84861196844

VL - 166-167

SP - 31

EP - 35

JO - Sensors and Actuators, B: Chemical

JF - Sensors and Actuators, B: Chemical

SN - 0925-4005

ER -