Highly selective and sensitive xylene sensors using Ni-doped branched ZnO nanowire networks

Hyung Sik Woo, Chang Hoon Kwak, Jaiho Chung, Jong Heun Lee

Research output: Contribution to journalArticle

56 Citations (Scopus)

Abstract

Branched ZnO nanowires (NWs) doped with Ni were grown by a three-step vapor phase method for the sensitive and selective detection of p-xylene. ZnO NWs were directly grown on sensor substrates with Au electrodes, which were transformed into NiO NWs by the thermal evaporation of NiCl<inf>2</inf> powder at 700 °C. ZnO branches doped with Ni were grown from NiO NWs by the thermal evaporation of Zn metal powder at 500°C. The stem NiO NWs played the role of catalyst for the growth of ZnO branches through vapor-liquid-solid mechanism. The Ni-doped branched ZnO NWs showed enhanced gas response (S = resistance ratio) to methyl benzenes, especially to 5 ppm p-xylene (S = 42.44) at 400°C. This value is 1.7 and 2.5 times higher than the responses to 5 ppm toluene (S = 25.73) and C<inf>2</inf>H<inf>5</inf>OH (S = 16.72), respectively, and significantly higher than the cross-responses to other interfering gases such as benzene, HCHO, trimethylamine, H<inf>2</inf>, and CO. The selective detection of xylene was attributed to the catalytic role of the Ni component. This novel method to form catalyst-doped hierarchical ZnO NWs provides a promising approach to accomplish superior gas sensing characteristics by the synergetic combination of enhanced chemiresistive variation due to the increased number of branch-to-branch Schottky barrier contacts and the catalytic function of the Ni dopant.

Original languageEnglish
Article number18340
Pages (from-to)358-366
Number of pages9
JournalSensors and Actuators, B: Chemical
Volume216
DOIs
Publication statusPublished - 2015 Sep 1

Fingerprint

Xylenes
xylene
Xylene
Nanowires
nanowires
sensors
Sensors
Thermal evaporation
Gases
Toluene
Benzene
Vapors
benzene
gases
evaporation
catalysts
metal powder
Catalysts
Powder metals
Carbon Monoxide

Keywords

  • Branched nanowire
  • Gas sensor
  • Ni-doped ZnO
  • Selectivity
  • Xylene

ASJC Scopus subject areas

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

Cite this

Highly selective and sensitive xylene sensors using Ni-doped branched ZnO nanowire networks. / Woo, Hyung Sik; Kwak, Chang Hoon; Chung, Jaiho; Lee, Jong Heun.

In: Sensors and Actuators, B: Chemical, Vol. 216, 18340, 01.09.2015, p. 358-366.

Research output: Contribution to journalArticle

@article{1adcdf5284a94c429feecf2278cbb241,
title = "Highly selective and sensitive xylene sensors using Ni-doped branched ZnO nanowire networks",
abstract = "Branched ZnO nanowires (NWs) doped with Ni were grown by a three-step vapor phase method for the sensitive and selective detection of p-xylene. ZnO NWs were directly grown on sensor substrates with Au electrodes, which were transformed into NiO NWs by the thermal evaporation of NiCl2 powder at 700 °C. ZnO branches doped with Ni were grown from NiO NWs by the thermal evaporation of Zn metal powder at 500°C. The stem NiO NWs played the role of catalyst for the growth of ZnO branches through vapor-liquid-solid mechanism. The Ni-doped branched ZnO NWs showed enhanced gas response (S = resistance ratio) to methyl benzenes, especially to 5 ppm p-xylene (S = 42.44) at 400°C. This value is 1.7 and 2.5 times higher than the responses to 5 ppm toluene (S = 25.73) and C2H5OH (S = 16.72), respectively, and significantly higher than the cross-responses to other interfering gases such as benzene, HCHO, trimethylamine, H2, and CO. The selective detection of xylene was attributed to the catalytic role of the Ni component. This novel method to form catalyst-doped hierarchical ZnO NWs provides a promising approach to accomplish superior gas sensing characteristics by the synergetic combination of enhanced chemiresistive variation due to the increased number of branch-to-branch Schottky barrier contacts and the catalytic function of the Ni dopant.",
keywords = "Branched nanowire, Gas sensor, Ni-doped ZnO, Selectivity, Xylene",
author = "Woo, {Hyung Sik} and Kwak, {Chang Hoon} and Jaiho Chung and Lee, {Jong Heun}",
year = "2015",
month = "9",
day = "1",
doi = "10.1016/j.snb.2015.04.035",
language = "English",
volume = "216",
pages = "358--366",
journal = "Sensors and Actuators, B: Chemical",
issn = "0925-4005",
publisher = "Elsevier",

}

TY - JOUR

T1 - Highly selective and sensitive xylene sensors using Ni-doped branched ZnO nanowire networks

AU - Woo, Hyung Sik

AU - Kwak, Chang Hoon

AU - Chung, Jaiho

AU - Lee, Jong Heun

PY - 2015/9/1

Y1 - 2015/9/1

N2 - Branched ZnO nanowires (NWs) doped with Ni were grown by a three-step vapor phase method for the sensitive and selective detection of p-xylene. ZnO NWs were directly grown on sensor substrates with Au electrodes, which were transformed into NiO NWs by the thermal evaporation of NiCl2 powder at 700 °C. ZnO branches doped with Ni were grown from NiO NWs by the thermal evaporation of Zn metal powder at 500°C. The stem NiO NWs played the role of catalyst for the growth of ZnO branches through vapor-liquid-solid mechanism. The Ni-doped branched ZnO NWs showed enhanced gas response (S = resistance ratio) to methyl benzenes, especially to 5 ppm p-xylene (S = 42.44) at 400°C. This value is 1.7 and 2.5 times higher than the responses to 5 ppm toluene (S = 25.73) and C2H5OH (S = 16.72), respectively, and significantly higher than the cross-responses to other interfering gases such as benzene, HCHO, trimethylamine, H2, and CO. The selective detection of xylene was attributed to the catalytic role of the Ni component. This novel method to form catalyst-doped hierarchical ZnO NWs provides a promising approach to accomplish superior gas sensing characteristics by the synergetic combination of enhanced chemiresistive variation due to the increased number of branch-to-branch Schottky barrier contacts and the catalytic function of the Ni dopant.

AB - Branched ZnO nanowires (NWs) doped with Ni were grown by a three-step vapor phase method for the sensitive and selective detection of p-xylene. ZnO NWs were directly grown on sensor substrates with Au electrodes, which were transformed into NiO NWs by the thermal evaporation of NiCl2 powder at 700 °C. ZnO branches doped with Ni were grown from NiO NWs by the thermal evaporation of Zn metal powder at 500°C. The stem NiO NWs played the role of catalyst for the growth of ZnO branches through vapor-liquid-solid mechanism. The Ni-doped branched ZnO NWs showed enhanced gas response (S = resistance ratio) to methyl benzenes, especially to 5 ppm p-xylene (S = 42.44) at 400°C. This value is 1.7 and 2.5 times higher than the responses to 5 ppm toluene (S = 25.73) and C2H5OH (S = 16.72), respectively, and significantly higher than the cross-responses to other interfering gases such as benzene, HCHO, trimethylamine, H2, and CO. The selective detection of xylene was attributed to the catalytic role of the Ni component. This novel method to form catalyst-doped hierarchical ZnO NWs provides a promising approach to accomplish superior gas sensing characteristics by the synergetic combination of enhanced chemiresistive variation due to the increased number of branch-to-branch Schottky barrier contacts and the catalytic function of the Ni dopant.

KW - Branched nanowire

KW - Gas sensor

KW - Ni-doped ZnO

KW - Selectivity

KW - Xylene

UR - http://www.scopus.com/inward/record.url?scp=84928790893&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84928790893&partnerID=8YFLogxK

U2 - 10.1016/j.snb.2015.04.035

DO - 10.1016/j.snb.2015.04.035

M3 - Article

VL - 216

SP - 358

EP - 366

JO - Sensors and Actuators, B: Chemical

JF - Sensors and Actuators, B: Chemical

SN - 0925-4005

M1 - 18340

ER -