Meso-porose surfaces as template materials


Meso- and nano-porose surfaces with length scale in the 10-200nm regime are important in surface chemistry, physics and biology due to their interesting properties as catalyst, functionalized template material and geometrically and electronically confining agent. In this thesis it is planned to use meso- and nano-porose surfaces as self-organized template materials for sensing applications and to control and enhance optical activity/polarizability. Following the preparation and characterization of porose Si (PS) and Al oxide by anodic oxidation (AAO) and cathodic electrochemical etching, respectively, a functionalization and filling of the pores will be performed in the liquid phase. The shift or quenching of photo luminescence in absorbed dyes, molecular systems and the effect of nano-scale metallic particles as light emitters will be monitored as function of the pore geometry. An aim of this thesis is the controlled enhancement of Raman scattering cross section of molecular systems with defined specificity for sensing applications, the observation of bistable optical switching phenomena and other functionalities on a single molecule level. This thesis has ties to the activities in the group of A. Waag with respect to the use and extension of scanning probe techniques, the work of M. Schilling, B. G├╝ttler and F. Riehle with respect to the development of nano-optics and plasmonics.

TU Braunschweig
Ph.D. student: