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Effect of mass and stress on resonant frequency shift of functionalized Pb(Zr0.52Ti0.48)O3 thin film microcantilever for the detection of C-reactive protein

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3 Author(s)
Lee, Jeong Hoon ; Microsystem Research Center, KIST, Seoul, 136-791, Korea ; Kim, Tae Song ; Yoon, Ki Hyun

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A micromachined PZT (52/48) thin film cantilever composed of SiO2/Ta/Pt/PZT/Pt/SiO2 on a SiNx supporting layer for simultaneous self-exciting and sensing was fabricated. We present the resonant frequency change of piezoelectric microcantilevers due to a combination of mass loading and spring constant variation arisen from antigen-antibody interaction of C-reactive protein (CRP). Experimentally measured resonant frequency shift is larger than that of theoretically calculated resonant frequency by two orders of magnitude due to a compressive stress arising from CRP antigen-antibody interaction. The changes in normalized resonant frequency shift δfexpt/f1expt were found to increase as the value of 40.5, 74.7, and 185×10-4 as the CRP antibody site ratio, increased 10%, 50%, and 100%, respectively. © 2004 American Institute of Physics.

Published in:

Applied Physics Letters  (Volume:84 ,  Issue: 16 )

Date of Publication:

Apr 2004

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