Metallic 1T-WS2 for Selective Impedimetric Vapor Sensing

Selective gas sensing is of immense importance for industrial as well as safety purposes. Here it is shown that metallic 1T phase transition metal dichalcogenides, such as tungsten sulfide (WS2), provide sensitive and selective platform for gas sensing. Using impedance spectroscopy distinguishable a...

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Main Authors: Yong, Alex Sheng Eng, Sofer, Zdeněk, Mayorga-Martinez, Carmen Clotilde, Ambrosi, Adriano, Pumera, Martin
Other Authors: School of Physical and Mathematical Sciences
Format: Journal Article
Language:English
Published: 2017
Subjects:
Online Access:https://hdl.handle.net/10356/83017
http://hdl.handle.net/10220/42393
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author Yong, Alex Sheng Eng
Sofer, Zdeněk
Mayorga-Martinez, Carmen Clotilde
Ambrosi, Adriano
Pumera, Martin
author2 School of Physical and Mathematical Sciences
author_facet School of Physical and Mathematical Sciences
Yong, Alex Sheng Eng
Sofer, Zdeněk
Mayorga-Martinez, Carmen Clotilde
Ambrosi, Adriano
Pumera, Martin
author_sort Yong, Alex Sheng Eng
collection NTU
description Selective gas sensing is of immense importance for industrial as well as safety purposes. Here it is shown that metallic 1T phase transition metal dichalcogenides, such as tungsten sulfide (WS2), provide sensitive and selective platform for gas sensing. Using impedance spectroscopy distinguishable alterations can be detected on the impedance phase spectrum of interdigitated gold electrode modified with chemically exfoliated 1T-WS2 caused by different vapors. In particular, it is found that the impedance phase spectra of 1T-WS2 device present different resonant frequencies with maximum around 1 Hz in the presence of methanol vapor and around 1 kHz in the presence of water vapor. Such a well-distinguished signal allows their selective detection also when they are present in a mixture. The impedance phase spectra allow the selective methanol and water vapor sensing with an impedimetric device based on 1T-WS2. This system utilizing 1T phase of WS2 for selective gas sensing based on impedance spectroscopy opens new avenues for gas sensing and shall find wide spectra of applications.
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spelling ntu-10356/830172020-03-07T12:31:27Z Metallic 1T-WS2 for Selective Impedimetric Vapor Sensing Yong, Alex Sheng Eng Sofer, Zdeněk Mayorga-Martinez, Carmen Clotilde Ambrosi, Adriano Pumera, Martin School of Physical and Mathematical Sciences Electrochemical impedance spectroscopy Impedance phase Selective gas sensing is of immense importance for industrial as well as safety purposes. Here it is shown that metallic 1T phase transition metal dichalcogenides, such as tungsten sulfide (WS2), provide sensitive and selective platform for gas sensing. Using impedance spectroscopy distinguishable alterations can be detected on the impedance phase spectrum of interdigitated gold electrode modified with chemically exfoliated 1T-WS2 caused by different vapors. In particular, it is found that the impedance phase spectra of 1T-WS2 device present different resonant frequencies with maximum around 1 Hz in the presence of methanol vapor and around 1 kHz in the presence of water vapor. Such a well-distinguished signal allows their selective detection also when they are present in a mixture. The impedance phase spectra allow the selective methanol and water vapor sensing with an impedimetric device based on 1T-WS2. This system utilizing 1T phase of WS2 for selective gas sensing based on impedance spectroscopy opens new avenues for gas sensing and shall find wide spectra of applications. MOE (Min. of Education, S’pore) 2017-05-12T04:37:10Z 2019-12-06T15:10:15Z 2017-05-12T04:37:10Z 2019-12-06T15:10:15Z 2015 2015 Journal Article Mayorga-Martinez, C. C., Ambrosi, A., Yong, A. S. E., Sofer, Z., & Pumera, M. (2015). Metallic 1T-WS2 for Selective Impedimetric Vapor Sensing. Advanced Functional Materials, 25(35), 5611-5616. 1616-301X https://hdl.handle.net/10356/83017 http://hdl.handle.net/10220/42393 10.1002/adfm.201502223 189796 en Advanced Functional Materials © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. 6 p.
spellingShingle Electrochemical impedance spectroscopy
Impedance phase
Yong, Alex Sheng Eng
Sofer, Zdeněk
Mayorga-Martinez, Carmen Clotilde
Ambrosi, Adriano
Pumera, Martin
Metallic 1T-WS2 for Selective Impedimetric Vapor Sensing
title Metallic 1T-WS2 for Selective Impedimetric Vapor Sensing
title_full Metallic 1T-WS2 for Selective Impedimetric Vapor Sensing
title_fullStr Metallic 1T-WS2 for Selective Impedimetric Vapor Sensing
title_full_unstemmed Metallic 1T-WS2 for Selective Impedimetric Vapor Sensing
title_short Metallic 1T-WS2 for Selective Impedimetric Vapor Sensing
title_sort metallic 1t ws2 for selective impedimetric vapor sensing
topic Electrochemical impedance spectroscopy
Impedance phase
url https://hdl.handle.net/10356/83017
http://hdl.handle.net/10220/42393
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