Microcantilever-based techniques can be used to explore the autonomy and property of biomolecules (e.g., DNA and single actin filaments) which, in measurement, are adsorbed on the cantilever surface. Here, an energy method is presented to predict the cantilever deflection induced by adsorbed atoms/molecules. The cantilever is modeled as a sandwich beam containing two surface layers of a finite thickness and a bulk layer between them. The adsorptions of O atoms on Si(100) and Hg atoms on Au(100) are taken as two representative examples. We demonstrate that physisorption can induce distinctly different deformation behaviors of cantilevers, which depend not only on the adatoms but also on the substrate material. These results are consistent with relevant experimental observations. This study is helpful for optimal design of microcantilever-based measurement techniques.
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1 May 2008
Research Article|
May 02 2008
Theoretical analysis of adsorption-induced microcantilever bending
Ji-Qiao Zhang;
Ji-Qiao Zhang
1FML, Department of Engineering Mechanics,
Tsinghua University
, Beijing 100084, People’s Republic of China
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Shou-Wen Yu;
Shou-Wen Yu
a)
1FML, Department of Engineering Mechanics,
Tsinghua University
, Beijing 100084, People’s Republic of China
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Xi-Qiao Feng;
Xi-Qiao Feng
1FML, Department of Engineering Mechanics,
Tsinghua University
, Beijing 100084, People’s Republic of China
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Gang-Feng Wang
Gang-Feng Wang
2MOE Key Laboratory for Strength and Vibration, Department of Engineering Mechanics,
Xi’an Jiaotong University
, Xi’an 710049, People’s Republic of China
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a)
Electronic mail: [email protected].
J. Appl. Phys. 103, 093506 (2008)
Article history
Received:
December 14 2007
Accepted:
February 27 2008
Citation
Ji-Qiao Zhang, Shou-Wen Yu, Xi-Qiao Feng, Gang-Feng Wang; Theoretical analysis of adsorption-induced microcantilever bending. J. Appl. Phys. 1 May 2008; 103 (9): 093506. https://doi.org/10.1063/1.2912727
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