Nano Archive

AFM-assisted fabrication of thiol SAM pattern with alternating quantified surface potential

Moores, Bradley and Simons, Janet and Xu, Song and Leonenko, Zoya (2011) AFM-assisted fabrication of thiol SAM pattern with alternating quantified surface potential. Nanoscale Research Letters, 6 (1). pp. 1-5.

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Thiol self-assembled monolayers (SAMs) are widely used in many nano- and bio-technology applications. We report a new approach to create and characterize a thiol SAMs micropattern with alternating charges on a flat gold-coated substrate using atomic force microscopy (AFM) and Kelvin probe force microscopy (KPFM). We produced SAMs-patterns made of alternating positively charged, negatively charged, and hydrophobic-terminated thiols by an automated AFM-assisted manipulation, or nanografting. We show that these thiol patterns possess only small topographical differences as revealed by AFM, and distinguished differences in surface potential (20-50 mV), revealed by KPFM. The pattern can be helpful in the development of biosensor technologies, specifically for selective binding of biomolecules based on charge and hydrophobicity, and serve as a model for creating surfaces with quantified alternating surface potential distribution.

Item Type:Article
Subjects:Physical Science > Nanophysics
Material Science > Nanofabrication processes and tools
Divisions:Faculty of Engineering, Science and Mathematics > School of Physics
ID Code:10960
Deposited By:JNCASR
Deposited On:30 May 2011 13:13
Last Modified:30 May 2011 13:13

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