Film Structure-Induced Resonant Oscillation Changes in a Poly Acrylic Acid Modified Quartz Crystal Sensor

A poly acrylic acid (PAA) film has been fabricated on a quartz crystal microbalance to study the dynamic property changes induced by different pH values. The experiment has been performed by a two-step. First, using the self-assembly procedure, the gold surface of quartz crystal was chemically modif...

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Bibliographic Details
Published in:Molecular crystals and liquid crystals (Philadelphia, Pa. : 2003) Pa. : 2003), 2008-01, Vol.492 (1), p.221/585-228/592
Main Authors: Kim, Woo Sik, Park, Jin Young, Kim, Seung Jin, Chang, Sang Mok, Kim, In Ho, Hilborn, Jöns, Kim, Jong Min
Format: Article
Language:English
Subjects:
Chemistry
collagen
Kemi
NATURAL SCIENCES
NATURVETENSKAP
pH effect
poly(acrylic acid)
QCA
QCM
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Summary:A poly acrylic acid (PAA) film has been fabricated on a quartz crystal microbalance to study the dynamic property changes induced by different pH values. The experiment has been performed by a two-step. First, using the self-assembly procedure, the gold surface of quartz crystal was chemically modified to allow the graft copolymerization with PAA. Secondly, the resonant frequency response of the PAA-modified QCM was investigated by varying the pH values. The result shows an interesting oscillation property change nearby pH 5.5, and a possible mechanism for the change is proposed considering the oscillation properties of quartz crystal and the physical properties of PAA. Finally, a polymer film complex of PAA/collagen was also used to confirm the proposed mechanism.
ISSN:1542-1406
1563-5287
1543-5318
DOI:10.1080/15421400802330713