Enhanced gas sensing performance based on the fabrication of polycrystalline Ag@TiO2 core-shell nanowires

Xiaohong Yang, Haitao Fu, Lingtong Zhang, Xizhong An, Shixian Xiong, Xuchuan Jiang, Aibing Yu

Research output: Contribution to journalArticleResearchpeer-review

3 Citations (Scopus)

Abstract

This study demonstrates a novel one-dimensional core-shell structure based on the coating of silver nanowires (Ag NWs) with a layer of titanium oxide (TiO 2 ) nanoparticles. This approach for generating core-shell structures is facile and straightforward, utilizing a sol-gel method followed by the crystallization of TiO 2 using a simple open-air hydrothermal method. The Ag nanowires are ˜10 μm in length and have a diameter of 100 nm, and their TiO 2 polycrystalline shell is 10–15 nm in thickness. These novel structures offer large surface area and high stability, which are qualities that favor gas sensing performance. Gas sensing tests have demonstrated that the generated Ag NWs@TiO 2 core-shell nanocomposites exhibit better sensing properties (response, selectivity, optimized working temperature, minimum concentration, and response and recovery time) when compared to sensors containing pure TiO 2 nanoparticles. The mechanism of sensing enhancement can be attributed to the Schottky barrier that exists at the interface between the Ag NWs and the TiO 2 . The Ag core has an excellent conductive property for electronic transfer and further accelerates the oxygen ionization and surface redox reactions. These results may shed light on the design and construction of TiO 2 -based nanocomposites for gas sensor applications.

Original languageEnglish
Pages (from-to)483-492
Number of pages10
JournalSensors and Actuators B: Chemical
Volume286
DOIs
Publication statusPublished - 1 May 2019

Keywords

  • Ag nanowires
  • Ammonia
  • Core-shell structure
  • Gas sensor
  • Polycrystalline TiO

Cite this

Yang, Xiaohong ; Fu, Haitao ; Zhang, Lingtong ; An, Xizhong ; Xiong, Shixian ; Jiang, Xuchuan ; Yu, Aibing. / Enhanced gas sensing performance based on the fabrication of polycrystalline Ag@TiO2 core-shell nanowires. In: Sensors and Actuators B: Chemical. 2019 ; Vol. 286. pp. 483-492.
@article{8d18d802cd8d41f3b2740db16a97df7c,
title = "Enhanced gas sensing performance based on the fabrication of polycrystalline Ag@TiO2 core-shell nanowires",
abstract = "This study demonstrates a novel one-dimensional core-shell structure based on the coating of silver nanowires (Ag NWs) with a layer of titanium oxide (TiO 2 ) nanoparticles. This approach for generating core-shell structures is facile and straightforward, utilizing a sol-gel method followed by the crystallization of TiO 2 using a simple open-air hydrothermal method. The Ag nanowires are ˜10 μm in length and have a diameter of 100 nm, and their TiO 2 polycrystalline shell is 10–15 nm in thickness. These novel structures offer large surface area and high stability, which are qualities that favor gas sensing performance. Gas sensing tests have demonstrated that the generated Ag NWs@TiO 2 core-shell nanocomposites exhibit better sensing properties (response, selectivity, optimized working temperature, minimum concentration, and response and recovery time) when compared to sensors containing pure TiO 2 nanoparticles. The mechanism of sensing enhancement can be attributed to the Schottky barrier that exists at the interface between the Ag NWs and the TiO 2 . The Ag core has an excellent conductive property for electronic transfer and further accelerates the oxygen ionization and surface redox reactions. These results may shed light on the design and construction of TiO 2 -based nanocomposites for gas sensor applications.",
keywords = "Ag nanowires, Ammonia, Core-shell structure, Gas sensor, Polycrystalline TiO",
author = "Xiaohong Yang and Haitao Fu and Lingtong Zhang and Xizhong An and Shixian Xiong and Xuchuan Jiang and Aibing Yu",
year = "2019",
month = "5",
day = "1",
doi = "10.1016/j.snb.2019.01.096",
language = "English",
volume = "286",
pages = "483--492",
journal = "Sensors and Actuators B: Chemical",
issn = "0925-4005",
publisher = "Elsevier",

}

Enhanced gas sensing performance based on the fabrication of polycrystalline Ag@TiO2 core-shell nanowires. / Yang, Xiaohong; Fu, Haitao; Zhang, Lingtong; An, Xizhong; Xiong, Shixian; Jiang, Xuchuan; Yu, Aibing.

In: Sensors and Actuators B: Chemical, Vol. 286, 01.05.2019, p. 483-492.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Enhanced gas sensing performance based on the fabrication of polycrystalline Ag@TiO2 core-shell nanowires

AU - Yang, Xiaohong

AU - Fu, Haitao

AU - Zhang, Lingtong

AU - An, Xizhong

AU - Xiong, Shixian

AU - Jiang, Xuchuan

AU - Yu, Aibing

PY - 2019/5/1

Y1 - 2019/5/1

N2 - This study demonstrates a novel one-dimensional core-shell structure based on the coating of silver nanowires (Ag NWs) with a layer of titanium oxide (TiO 2 ) nanoparticles. This approach for generating core-shell structures is facile and straightforward, utilizing a sol-gel method followed by the crystallization of TiO 2 using a simple open-air hydrothermal method. The Ag nanowires are ˜10 μm in length and have a diameter of 100 nm, and their TiO 2 polycrystalline shell is 10–15 nm in thickness. These novel structures offer large surface area and high stability, which are qualities that favor gas sensing performance. Gas sensing tests have demonstrated that the generated Ag NWs@TiO 2 core-shell nanocomposites exhibit better sensing properties (response, selectivity, optimized working temperature, minimum concentration, and response and recovery time) when compared to sensors containing pure TiO 2 nanoparticles. The mechanism of sensing enhancement can be attributed to the Schottky barrier that exists at the interface between the Ag NWs and the TiO 2 . The Ag core has an excellent conductive property for electronic transfer and further accelerates the oxygen ionization and surface redox reactions. These results may shed light on the design and construction of TiO 2 -based nanocomposites for gas sensor applications.

AB - This study demonstrates a novel one-dimensional core-shell structure based on the coating of silver nanowires (Ag NWs) with a layer of titanium oxide (TiO 2 ) nanoparticles. This approach for generating core-shell structures is facile and straightforward, utilizing a sol-gel method followed by the crystallization of TiO 2 using a simple open-air hydrothermal method. The Ag nanowires are ˜10 μm in length and have a diameter of 100 nm, and their TiO 2 polycrystalline shell is 10–15 nm in thickness. These novel structures offer large surface area and high stability, which are qualities that favor gas sensing performance. Gas sensing tests have demonstrated that the generated Ag NWs@TiO 2 core-shell nanocomposites exhibit better sensing properties (response, selectivity, optimized working temperature, minimum concentration, and response and recovery time) when compared to sensors containing pure TiO 2 nanoparticles. The mechanism of sensing enhancement can be attributed to the Schottky barrier that exists at the interface between the Ag NWs and the TiO 2 . The Ag core has an excellent conductive property for electronic transfer and further accelerates the oxygen ionization and surface redox reactions. These results may shed light on the design and construction of TiO 2 -based nanocomposites for gas sensor applications.

KW - Ag nanowires

KW - Ammonia

KW - Core-shell structure

KW - Gas sensor

KW - Polycrystalline TiO

UR - http://www.scopus.com/inward/record.url?scp=85061175900&partnerID=8YFLogxK

U2 - 10.1016/j.snb.2019.01.096

DO - 10.1016/j.snb.2019.01.096

M3 - Article

VL - 286

SP - 483

EP - 492

JO - Sensors and Actuators B: Chemical

JF - Sensors and Actuators B: Chemical

SN - 0925-4005

ER -