Details

Autor(en) / Beteiligte

• Mayorga-Martinez, Carmen C.
• Ambrosi, Adriano
• Eng, Alex Yong Sheng
• Sofer, Zdeněk
• Pumera, Martin

Titel

Metallic 1T-WS2 for Selective Impedimetric Vapor Sensing

Ist Teil von

• Advanced functional materials, 2015-09, Vol.25 (35), p.5611-5616

Ort / Verlag

Blackwell Publishing Ltd

Erscheinungsjahr

2015

Quelle

Wiley Online Library Journals Frontfile Complete

Beschreibungen/Notizen

• 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. The impedance phase spectra of metallic 1T‐WS2 present specific resonant frequencies for methanol and water vapors, meaning that using the same 1T‐WS2 platform is possible to detect methanol and water vapors by selecting specific frequencies (1 Hz for methanol and 1 kHz for water).