Premium
Metallic 1T‐WS 2 for Selective Impedimetric Vapor Sensing
Author(s) -
MayorgaMartinez Carmen C.,
Ambrosi Adriano,
Eng Alex Yong Sheng,
Sofer Zdeněk,
Pumera Martin
Publication year - 2015
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201502223
Subject(s) - materials science , dielectric spectroscopy , electrical impedance , phase (matter) , metal , electrode , analytical chemistry (journal) , spectroscopy , spectral line , sulfide , methanol , water vapor , tungsten , optoelectronics , nanotechnology , electrochemistry , organic chemistry , chemistry , electrical engineering , physics , quantum mechanics , astronomy , metallurgy , engineering
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 (WS 2 ), 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‐WS 2 caused by different vapors. In particular, it is found that the impedance phase spectra of 1T‐WS 2 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‐WS 2 . This system utilizing 1T phase of WS 2 for selective gas sensing based on impedance spectroscopy opens new avenues for gas sensing and shall find wide spectra of applications.