Ionic liquids tailored for reaction-based gas sensing on quartz crystal microbalance

Abstract

Gas sensing technologies are of importance for a variety of industrial, environmental, medical, and even military applications. Many gases, such as man-made or naturally occurring volatile organic compounds (VOCs), can adversely affect human health or cause harm to the environment. Recent advances in “designer solvents” and sensor technologies have facilitated the development of ultrasensitive gas sensing ionic liquids (SILs) based on quartz crystal microbalance (QCM) that can real-time detect and discriminate VOCs. Based on specific chemical reactions at room temperature, thin-coated functionalized ionic liquids on quartz chips are able to capture VOCs chemoselectively with a single-digit parts-per-billion detection limit. The amalgamation of tailor-made functional SILs and QCM results in a new class of qualitative and semiquantitative gas sensing device, which represents a prototype of electronic nose. This review vignettes some conventional gas sensing approaches and collates latest research results in the exploration of SIL-on-QCM chips and gives an account of the state-of-the-art gas sensing technology.

Exploiting 1,2,3-Triazolium Ionic Liquids for Synthesis of Tryptanthrin and Chemoselective Extraction of Copper(II) Ions and Histidine-Containing Peptides

“…It is of note that this optimized synthesis of ionic liquids 1 and 2, in our hands required no chromatographic separation. In our research, we are interested in developing new ionic liquids or improving the synthesis of known ionic liquids and we have an ongoing program to evaluate ionic liquids as stable media for chemical synthesis [7][8][9][10][11] and as functional materials for biochemical applications [12,13]. We recently reported the preparation of bicyclic 1,2,3-triazolium ionic liquids in four steps with good yields [1].…”

Affinity Ionic Liquids for Chemoselective Gas Sensing

“…Broadly speaking, methods for gas detection can be separated into two parts. Spectroscopic and spectrometric methods are powerful tools to provide high sensitivity in detection, yet the shortcomings of their large sizes in instruments, immobility and relatively expensive cost make them unsuitable for immediate analysis [ 118 ]. On the other hand, inspired by the mammalian olfactory system, various concepts of electronic nose have been employed and developed.…”

Reaction-Based Amine and Alcohol Gases Detection with Triazine Ionic Liquid Materials

“…Upon SNAr reaction of AIL 1 with a nucleophilic amine or alcohol gas, a resonance frequency drop is readily detected by a masssensitive QCM. QCM has been in constant focus of research on chemical analysis in both solutions and gas phases over the years [1][2][3]. This is due primarily to its low cost and real-time analysis of adsorption QCM has been in constant focus of research on chemical analysis in both solutions and gas phases over the years [1][2][3].…”

“…QCM has been in constant focus of research on chemical analysis in both solutions and gas phases over the years [1][2][3]. This is due primarily to its low cost and real-time analysis of adsorption QCM has been in constant focus of research on chemical analysis in both solutions and gas phases over the years [1][2][3]. This is due primarily to its low cost and real-time analysis of adsorption or recognition processes onto the surface of affinity materials such as ionic liquids deposited on electrodes when being operated at room temperature.…”