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Cavities generated by self-organised monolayers as sensitive coatings for surface acoustic wave resonators

Title data

Lieberzeit, Peter A. ; Greibl, Wolfgang ; Jenik, Michael ; Dickert, Franz L. ; Fischerauer, Gerhard ; Bulst, Wolf-Eckhart:
Cavities generated by self-organised monolayers as sensitive coatings for surface acoustic wave resonators.
In: Analytical and Bioanalytical Chemistry. Vol. 387 (January 2007) Issue 2 . - pp. 561-566.
ISSN 1618-2650
DOI: https://doi.org/10.1007/s00216-006-0978-0

Abstract in another language

Silanisation of quartz substrate surfaces with a mixture of two chlorosilanes, namely trimethylchlorosilane and 7-octenyldimethylchlorosilane, leads to sensitive coatings for volatile organic compounds (VOC) on surface acoustic wave (SAW) devices. In this way we created monolayers of molecular cavities engulfing the analytes according to host–guest chemistry directly on the device surfaces, and also confirmed the occurrence of such cavities by molecular modelling. We monitored the binding process of the silanes by using Fourier transform infrared (FTIR) spectrometry and atomic force microscopy (AFM). In order to increase the stiffness of the cavities, we crosslinked the terminal double bonds of the long spacers by heating the surface in the presence of a radical initiator. Compared to SAW delay lines silanised with trimethylchlorosilane, devices modified with the binary silane mixture lead to substantially higher frequency shifts when exposed to solvent vapour streams. Nearly instantaneous responses can be observed, which e.g. allows xylene detection down to a few ppm.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: SAW; VOC detection; self-assembled monolayers; quartz surfaces; chlorosilanes
Institutions of the University: Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Measurement and Control Technology > Chair Measurement and Control Technology - Univ.-Prof. Dr.-Ing. Gerhard Fischerauer
Faculties
Faculties > Faculty of Engineering Science > Chair Measurement and Control Technology
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 22 Feb 2016 06:52
Last Modified: 22 Feb 2016 06:52
URI: https://eref.uni-bayreuth.de/id/eprint/31079