Berlin 2008 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 34: POSTERS Polymerphysics
CPP 34.5: Poster
Donnerstag, 28. Februar 2008, 17:00–19:30, Poster A
Poly(N-Isopropylacrylamide) as thermo responsive coating on Microcantilever Sensors — •Sebastian K. Nett1,2, Calvin Bradley1, Mine Memesa1, Yajun Cheng1, Sebastian Lenz1, Rüdiger Berger1, and Jochen S. Gutmann1,2 — 1Max Planck Institute for Polymer Research, Ackermannweg 10, D-55128 Mainz — 2Institute for Physical Chemistry, Johannes Gutenberg University, Jakob-Welder-Weg 10, D-55099 Mainz
Micro fabricated cantilevers proofed to be a versatile system to be used as sensors. Any stress applied to the cantilever is very precisely detectable. Our system is consisting of an array of eight microcantilever (MCS) with a width of 90 µm, a length from 500 to 1000 µm and a thickness from 1 to 10 µm. Combined with a functional layer it is possible to build a very specific sensing system. Poly(N-Isopropylacrylamide) (PNIPAM) is known to be a polymer which exhibits a coil to globule transition in water at around 32∘C [1]. PNIPAM is grafted from the silicon surface of the MCS by atom transfer polymerization (ATRP). The surface layer was analyzed on the single cantilever by µ-focus GISAXS [2] and imaging ellipsometry to determine the layer thickness. We monitored the transition by heating the coated cantilever in water. The bending was detected by the so called deflection method. At the transition temperature a change in bending is clearly observed. The reasons for the bending are discussed as a function of grafting density and layer thickness. [1] Heskins, M., et. al., J. Macromol. Sci. Chem. A2 1968, 1441. [2] Wolkenhauer, M., et. al., Applied Physics Letters 2006, 89.