Prof. Yongda Yan, Harbin Institute of Technology, China

Title

Fabrication of SERS substrates based on the overlap of pile-up materials

Abstract

Surface Enhanced Raman spectroscopy (SERS) is a prominent, highly analytical tool for the detection of chemical molecules and biological species at low concentrations. Metal micro/nanostructures have already been verified for use as SERS substrates which can be fabricated by the conventional micro/nano machining methods including EBL, FIB, nanoimprint lithography and so on. The major limitations of these methods are in the complexity of the fabrication processes. Additionally, more complex micro/nanostructures are difficult to be machined using these ways. Therefore, in the present study, a nanomechanical machining method based on the overlap of pile-up materials is presented. Firstly, the formation mechanism of this method is explained by the theoretical analysis and experimental studies. Secondly, a force modulation based micro/nano mechanical machining system is developed. Thirdly, periodical micro/nano structures are successfully machined by this method. The transferring method is then used to obtain the PDMS SERS substrate followed by the coating Au film process. Finally, Rhodamine 6G (R6G) and Malachite Green molecules were used as probe molecules in the present study to confirm the SERS measurements on the structured substrates.

Biography

Yongda Yan, He was born in 1976. He is a professor of School of Mechatronics Engineering of Harbin Institute of Technology now. He received his M.S. and Ph.D. degrees in mechanical engineering from Harbin Institute of Technology in 2001 and 2007, respectively. His main research field is the ultraprecision machining and micro/nano machining techniques. More than 100 papers are published in the SCI indexed journals. His Honors and awards include Winner of National Youth Top-notch Talent Support Program, Winner of Program for New Century Talents Support Program, Winner of National Science Fund for Excellent Young Scholars, Winner of National 100 Excellent Doctoral Theses, and so on.