AFM STUDY OF THE EVOLUTION OF DOUBLE LAYER ONSiO2SURFACE AND SELF-ASSEMBLY MONOLAYER INDUCED BY THE POLARIZATION WITH DC VOLTAGES

Tian Tian, Yong Zhang, Haitao Wang, Ningping Huang and Zhongdang Xiao ()
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Tian Tian: State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Sipailou 2#, Nanjing, 210096, China
Yong Zhang: State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Sipailou 2#, Nanjing, 210096, China
Haitao Wang: State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Sipailou 2#, Nanjing, 210096, China
Ningping Huang: State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Sipailou 2#, Nanjing, 210096, China
Zhongdang Xiao: State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Sipailou 2#, Nanjing, 210096, China;

Surface Review and Letters (SRL), 2009, vol. 16, issue 01, 87-92

Abstract: AFM was used to study the evolution of double layer onSiO2surface and self-assembly monolayer induced by the polarization with DC voltages. Approach force curves were recorded when external DC voltages were applied between solution andSiO2or aminopropyltriethoxysilane (APTES) modifiedSiO2surfaces in electrolyte solution. The results showed that the reversing of tip–surface interaction forces between attraction and repulsion could take place only by adjusting DC voltages. It is very useful for biotechnology because the adsorption of biomolecules could be controllable by DC voltages. A model was proposed to explain the behavior of double layer under DC voltages.

Keywords: AFM; double layer; force curves; self-assembly monolayer (search for similar items in EconPapers)
Date: 2009
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DOI: 10.1142/S0218625X09012330

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