Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 14: Interfaces and Thin Films I
CPP 14.8: Vortrag
Montag, 12. März 2018, 17:00–17:15, C 264
Silicon surface functionalization towards biosensing via free standing Si-OH bonds on a non-oxidized surface — •Jessica Hänisch1, Karsten Hinrichs2, and Jörg Rappich1 — 1Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Institut für Silizium-Photovoltaik, Kekuléstraße 5, 12489 Berlin (Germany) — 2Leibniz-Institut für Analytische Wissenschaften - ISAS - e. V., ISAS-Berlin, Schwarzschildstraße 8, 12489 Berlin, Germany
Silicon (Si) is widely used as a substrate material for the fabrication of biosensor devices.[1] In the most cases, the starting point of the surface functionalization are the surface hydroxyl groups present on the native oxide layer of the Si. The hydroxyl groups can be easily coupled with a huge variety of different silane molecules, depending on the desired functionalities. However, the present oxide layer between the surface functionalization and the bulk Si has some disadvantages like a high defect density and a lower transconductance.[2][3][4] To overcome these downsides, we developed a synthetic pathway, with which single standing and highly stable hydroxyl groups directly bound to the Si surface can be obtained, which has not been achieved before. The hydroxyl groups were further functionalized to obtain a surface ready for immobilization reactions. [1] N.S.K. Gunda, M. Singh, L. Norman, K. Kaur, S.K. Mitra, Appl. Surf. Sci. 2014, 305, 522. [2] H. Haick, P. T. Hurley, A. I. Hochbaum, P. Yang, N. S. Lewis, J. Am. Chem. Soc. 2006, 128, 8990. [3] Y. Cui, Z. Zhong, D. Wang, W. U. Wang, C. M. Lieber, Nano Lett. 2003, 3, 149. [4] O. Assad, H. Haick, 2008 IEEE International Symposium on Industrial Electronics, 2040.