Microbead dynamics on Quartz Crystal Microbalance at elevated amplitudes

Author

Ghosh, S.K. ; Ostanin, V.P. ; Seshia, A.A.

Author_Institution

Univ. of Cambridge, Cambridge, UK

fYear

2009

fDate

20-23 Sept. 2009

Firstpage

641

Lastpage

644

Abstract

The application of the Quartz Crystal Microbalance (QCM) for biochemical sensing is well known. However, utilizing the nonlinear response of the QCM at elevated amplitudes has received sporadic attention. This study presents results for QCM-analyte interaction that provide insight into the nonlinear dynamics of the QCM with attached analyte. In particular, interactions of the QCM with polystyrene microbeads physisorbed via self-assembled monolayer (SAM) were studied through experiments and modelling. It was found that the response of the QCM coupled to these surface adsorbents is anharmonic even at low oscillation amplitudes and that the nonlinear signals from such interactions are much higher than those for bare quartz. Therefore, these signals can potentially be used as sensitive signatures of adsorbents and their kinetics on the surface.

Keywords

acoustic resonators; acoustic wave propagation; chemical sensors; crystal resonators; monolayers; quartz; self-assembly; QCM nonlinear dynamics; QCM-analyte interaction; adsorbent signatures; biochemical sensing; microbead dynamics; nonlinear response; polystyrene microbeads; quartz crystal microbalance; self-assembled monolayer; surface adsorbents; Instruments; Nonlinear optics; Optical microscopy; Optical receivers; Optical resonators; Optical sensors; Power harmonic filters; Power system harmonics; Resonant frequency; Signal generators; QCM; anharmonic forces; nonlinear detection; physisorbed microbeads;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium (IUS), 2009 IEEE International

Conference_Location

Rome

ISSN

1948-5719

Print_ISBN

978-1-4244-4389-5

Electronic_ISBN

1948-5719

Type

conf

DOI

10.1109/ULTSYM.2009.5441575

Filename

5441575