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ACS Appl Mater Interfaces

Title:		Detection of Volatile Organic Compounds Using Microfabricated Resonator Array Functionalized with Supramolecular Monolayers
Author(s):		Lu Y; Chang Y; Tang N; Qu H; Liu J; Pang W; Zhang H; Zhang D; Duan X;
Address:
Journal Title:		ACS Appl Mater Interfaces
Year:		2015
Volume:		20150806
Issue:		32
Page Number:		17893 - 17903
DOI:		10.1021/acsami.5b04385
ISSN/ISBN:		1944-8252 (Electronic) 1944-8244 (Linking)
Abstract:		"This paper describes the detection of volatile organic compounds (VOCs) using an e-nose type integrated microfabricated sensor array, in which each resonator is coated with different supramolecular monolayers: p-tert-butyl calix[8]arene (Calix[8]arene), 2,3,7,8,12,13,17,18-octaethyl-21H,23H-porphine (Porphyrin), beta-cyclodextrin (beta-CD), and cucurbit[8]uril (CB[8]). Supramolecular monolayers fabricated by Langmuir-Blodgett techniques work as specific sensing interface for different VOCs recognition which increase the sensor selectivity. Microfabricated ultrahigh working frequency film bulk acoustic resonator (FBAR) transducers (4.4 GHz) enable their high sensitivity toward monolayer gas sensing which facilitate the analyses of VOCs adsorption isotherms and kinetics. Two affinity constants (K1, K2) are obtained for each VOC, which indicate the gas molecule adsorption happen inside and outside of the supramolecular cavities. Additional kinetic information on adsorption and desorption rate constants (ka, kd) are obtained as well from exponential fitting results. The five parameters, one from the conventional frequency shift signals of mass transducers and the other four from the indirect analyses of monolayer adsorption behaviors, thus enrich the sensing matrix (Deltaf, K1, K2, ka, kd) which can be used as multiparameter fingerprint patterns for highly selective detection and discrimination of VOCs"
Keywords:		Langmuir-Blodgett films VOCs adsorption isotherms electronic nose kinetics resonator array supramolecular chemistry;
Notes:		"PubMed-not-MEDLINELu, Yao Chang, Ye Tang, Ning Qu, Hemi Liu, Jing Pang, Wei Zhang, Hao Zhang, Daihua Duan, Xuexin eng Research Support, Non-U.S. Gov't 2015/08/01 ACS Appl Mater Interfaces. 2015 Aug 19; 7(32):17893-903. doi: 10.1021/acsami.5b04385. Epub 2015 Aug 6"