Title :

Metal-Semiconductor Nanocomposites for Thermoelectric Energy Conversion and Development of Ultra-Sensitive Fluidic Sensors

Speaker :

Dr. Dongyan Xu

Postdoctoral Fellow, Department of Mechanical Engineering, University of California, Berkeley

Material Sciences Division, Lawrence Berkeley National Laboratory, USA

Venue :

Room 215, William M. W. Mong Engineering Building, CUHK

Date :

Apr 14, 2010, Wednesday
11:30 AM - 12:30 PM

Abstract :

Thermoelectric energy conversion is an appealing approach for waste heat recovery by directly converting it to electricity. However, its widespread use is currently limited by the low efficiency. In the past decade, the ability to create nanostructured thermoelectric materials has led to remarkable progress in enhancing thermoelectric properties. In this talk, I will introduce the approach of metal-semiconductor nanocomposites we used to achieve the high performance thermoelectric materials. I will mainly focus on experimental and theoretical studies on thermal transport in these nanocomposite materials. In the second part, I will talk about my PhD research at Vanderbilt University on the development of ultra-sensitive MOSFET-based fluidic sensors. A 10-fold enhancement in sensitivity has been demonstrated with the new MOSFET-based sensing scheme compared to the traditional resistive pulse sensing technique. I will also discuss the fundamental studies on ion and fluid transport in highly confined nanoenvironment by using molecular dynamics simulation method.

Biography :

Dr. Dongyan Xu received her B.E. and M.E. degrees in Engineering Thermophysics from Tsinghua University, Beijing, China in 1998 and 2004, respectively, and her Ph.D. degree in Mechanical Engineering from Vanderbilt University, Nashville, TN in 2008. She is currently working as a postdoctoral researcher in the Department of Mechanical Engineering at University of California, Berkeley. Her research interests include energy conversion and storage, nanoscale heat transfer, thermoelectrics, micro/nanofluidics, and molecular dynamics.

    **************************************** ALL ARE WELCOME ****************************************

Enquiries: Ms. Winnie Wong or Prof. Wen J. Li, Department of Mechanical and Automation Engineering, CUHK at 2609 8337. *MAE Series (2009-10) is contained in the World-Wide Web home page at http://www3.mae.cuhk.edu.hk/maeseminars.php#mae