Issue 10, 2001

Cyclodextrin derivative-coated quartz crystal microbalances for alcohol sensing and application as methanol sensors

Abstract

Three novel cyclodextrin derivatives, mono(6-benzylimino-6-deoxy)-β-cyclodextrin (2), mono-(6-cyclohexylamino-6-deoxy)-β-cyclodextrin (3) and mono(6-benzylamino-6-deoxy)-β-cyclodextrin (4), together with mono(6-phenylamino-6-deoxy)-β-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 β-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.

Article information

Article type
Paper
Submitted
04 Jun 2001
Accepted
16 Jul 2001
First published
26 Sep 2001

Analyst, 2001,126, 1716-1720

Cyclodextrin derivative-coated quartz crystal microbalances for alcohol sensing and application as methanol sensors

C. Wang, F. Chen, X. He, S. Kang, C. You and Y. Liu, Analyst, 2001, 126, 1716 DOI: 10.1039/B104877P

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