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

Author

Listed:
  • 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;
    Laboratory of Environment and Biosafety, Research Institute of Southeast University in Suzhou, Dushu Lake Higher Education Town, Suzhou 215123, China)

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.

Suggested Citation

  • Tian Tian & Yong Zhang & Haitao Wang & Ningping Huang & Zhongdang Xiao, 2009. "AFM STUDY OF THE EVOLUTION OF DOUBLE LAYER ONSiO2SURFACE AND SELF-ASSEMBLY MONOLAYER INDUCED BY THE POLARIZATION WITH DC VOLTAGES," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 16(01), pages 87-92.
    • Handle: RePEc:wsi:srlxxx:v:16:y:2009:i:01:n:s0218625x09012330
    DOI: 10.1142/S0218625X09012330
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