Berlin 2001 – wissenschaftliches Programm
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CPP: Chemische Physik und Polymerphysik
CPP 14: Self Assembled Layered Systems
CPP 14.6: Vortrag
Donnerstag, 5. April 2001, 17:25–17:45, 112
Adsorption Behavior and Optical Properties of Surface-Adsorbed Polystyrene Nano Particles — •Michael Himmelhaus1 and Hiroyuki Takei2 — 1Ang. Phys. Chemie U Heidelberg, INF 253, 69120 Heidelberg — 2Hitachi Central Research Laboratory, Hatoyama, Japan
While most applications utilizing surface-adsorbed PS nano particles deal with ordered arrays on mesoscopic scale, recently a chemically induced method for adsorption of such particles was introduced to yield random-close-packed (rcp) monolayers of almost arbitrary lateral extension. Such layers can be used as a template for the formation of cap-shaped Gold nano particles that exhibit extraordinary optical properties. Here we demonstrate that in combination with thiol chemistry better control of sphere adsorption can be achieved. Sphere layers of varying density can be fabricated and their optical properties can be studied as a function of coverage. By further utilizing Micro Contact Printing of tailgroup modified alkanethiols 2D patterns of rcp PS sphere layers with a lateral resolution of a few microns and a total pattern area of 1 sqcm can be produced. These patterns are a first step to the development of an optical biosensor based on cap-shaped Gold nano particles with massively parallel detection capability.