title: Cyclodextrin derivative-coated quartz crystal microbalances for alcohol sensing and application as methanol sensors.
abstract: Three novel cyclodextrin derivatives, mono(6-benzylimino-6-deoxy)-beta-cyclodextrin (2), mono-(6-cyclohexylamino-6-deoxy)-beta-cyclodextrin (3) and mono(6-benzylamino-6-deoxy)-beta-cyclodextrin (4), together with mono(6-phenylamino-6-deoxy)-beta-cyclodextrin (1), were synthesized and employed as sensing materials coated on quartz crystal microbalances (QCMs). Comparison of the responses to some alcohol and solvent vapours such as methanol, ethanol, propan-1-ol, propan-2-ol, butan-1-ol, acetone, chloroform and benzene indicated that these beta-cyclodextrin derivatives show considerable sensitivity and selectivity towards methanol. It shows a good linear relationship between the frequency shift and the methanol concentration in the range 3-160 mg L(-1) for 2-4 and 3-140 mg L(-1) for 1. The correlation coefficients are 0.9971, 0.9983, 0.9973 and 0.9977, respectively. The limit of detection (LOD) is 0.2 mg L(-1). When small amounts of other vapours co-exist, e.g., ethanol, propan-1-ol and acetone, the responses differ from that of pure methanol vapour, and a deduction method could eliminate this cross-sensitivity. The water cross-sensitivity was very low. These QCMs coated with cyclodextrin derivatives are employed as methanol sensors in the real atmosphere to detect on-line the concentration of methanol vapour.
authors.affiliation: Department of Chemistry, Nankai University, Tianjin, China.
authors.forename: C
authors.initials: C
authors.lastname: Wang
authors.forename: F
authors.initials: F
authors.lastname: Chen
authors.forename: X W
authors.initials: XW
authors.lastname: He
authors.forename: S Z
authors.initials: SZ
authors.lastname: Kang
authors.forename: C C
authors.initials: CC
authors.lastname: You
authors.forename: Y
authors.initials: Y
authors.lastname: Liu
mesh_terms: D000395:Air Pollutants, Occupational / Q000032:analysis*; D015374:Biosensing Techniques; D006801:Humans; D000432:Methanol / Q000032:analysis*; D012997:Solvents / Q000032:analysis*
chemical_list: D000395:Air Pollutants, Occupational; D012997:Solvents; D000432:Methanol