Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/14463
Title: SPR, AFM, XPS study of nanopatterns formed by adsorption of small molecules and block copolymer on gold
Authors: SIDDHARTH JOSHI
Keywords: Diblock copolymer, Self Assembly, Phase Separation, SPR, AFM, XPS
Issue Date: 24-Jan-2005
Source: SIDDHARTH JOSHI (2005-01-24). SPR, AFM, XPS study of nanopatterns formed by adsorption of small molecules and block copolymer on gold. ScholarBank@NUS Repository.
Abstract: Formation of surfacea??induced nano pattern in mono-molecular film of a diblock copolymers poly(styrene-b-2-vinylpyridine) and poly(styrene-b-4-vinylpyridine) on mica have been studied. Dipping of mica substrates into the polymer solution (0.04mg/ml) and annealing (140A?C, 3 hours) result in various nano pattern formations (worm and dot/island type domains) on the surface due to phase segregation. Recently, we attempt to form such nano patterns on mercaptohexadecanoic acid (COOH-C15SH) modified Au(111)/mica. Adsorption of these polymers on COOH-C15SH SAM/Au(111)/mica surface produces worm like and dot/island type domains as on mica. The structure and size of the domains can be controlled by the molecular weight and block length ratio n = (NPS/N2VP).The adsorption kinetics and averaged film thickness of diblock copolymers on gold and COOH-C15SH modified gold are characterized by Surface Plasmon Resonance (SPR) spectroscopy. Angular resolved X-ray photoelectron spectroscopy (ARXPS) and Atomic force microscopy (AFM) are utilized to characterize the conformational structure and thickness of copolymer films.
URI: http://scholarbank.nus.edu.sg/handle/10635/14463
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