Differential solute gas response in ionic-liquid-based QCM arrays

Elucidating design factors responsible for discriminative explosive gas sensing

Abdul Rehman, Andrew Hamilton, Alfred Chung, Gary A. Baker, Zhe Wang, Xiangqun Zeng

Research output: Contribution to journalArticle

Abstract

An eight-sensor array coupling a chemoselective room-temperature ionic liquid (RTIL) with quartz crystal microbalance (QCM) transduction is presented in this work in order to demonstrate the power of this approach in differentiating closely related analytes in sensory devices. The underlying mechanism behind the specific sensory response was explored by (i) studying mass loading and viscoelasticity effects of the sensing layers, predominantly through variation in damping impedance, the combination of which determines the sensitivity; (ii) creation of a solvation model based on Abraham's solvation descriptors which reveals the fact that polarizability and lipophilicity are the main factors influencing the dissolution of gas analytes into the RTILs; and (iii) determination of enthalpy and entropy values for the studied interactions and comparison via a simulation model, which is also effective for pattern discrimination, in order to establish a foundation for the analytical scientist as well as inspiration for synthetic pathways and innovative research into next-generation sensory approaches. The reported sensors displayed an excellent sensitivity with detection limit of

Original languageEnglish (US)
Pages (from-to)7823-7833
Number of pages11
JournalAnalytical Chemistry
Volume83
Issue number20
DOIs
StatePublished - Oct 15 2011

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Ionic Liquids
Quartz crystal microbalances
Solvation
Gases
Viscoelasticity
Sensor arrays
Enthalpy
Dissolution
Entropy
Damping
Sensors
Temperature

ASJC Scopus subject areas

  • Analytical Chemistry

Cite this

Differential solute gas response in ionic-liquid-based QCM arrays : Elucidating design factors responsible for discriminative explosive gas sensing. / Rehman, Abdul; Hamilton, Andrew; Chung, Alfred; Baker, Gary A.; Wang, Zhe; Zeng, Xiangqun.

In: Analytical Chemistry, Vol. 83, No. 20, 15.10.2011, p. 7823-7833.

Research output: Contribution to journalArticle

Rehman, Abdul ; Hamilton, Andrew ; Chung, Alfred ; Baker, Gary A. ; Wang, Zhe ; Zeng, Xiangqun. / Differential solute gas response in ionic-liquid-based QCM arrays : Elucidating design factors responsible for discriminative explosive gas sensing. In: Analytical Chemistry. 2011 ; Vol. 83, No. 20. pp. 7823-7833.
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