【系列讲座】Changing the conductance of very thin semiconducting and 2D materials layers using charge modulation prompted by metal nanoparticles instead of doping

Lecture 1

报告题目：Changing the conductance of very thin semiconducting and 2D materials layers using charge modulation prompted by metal nanoparticles instead of doping.

报告时间：2018年7月9日下午15:30 – 16:50

报告地点：卢嘉锡楼202

报告摘要：Several groups have shown that placing metal nanoparticles on the surfaces of semiconducting nanowires or thin semiconductor layers can change the conductivity of these supports giving them p or n properties. This approach is commonly used to make sensitive gas sensors since the adsorption of gases on such structures alter the conductivity of the material and hence the current flowing through them at a given applied voltage in response to the donation of removal of electrons or holes during the surface reaction. Professor Gaustav Banerjee, of the UCSB’s department of Electrical and Computer Engineering asked us to collaborate on a strategy for modulating the electron and hole populations of thin 2D layers (MoS₂ and WSe₂) used as the channel in field effect transistors, showing this technique to be capable of converting the materials to p-type semiconductors resulting in FETs with excellent characteristics and with easily tunable properties.

Professor Martin Moskovits

    Professor Martin Moskovits has degrees in Physics and Chemistry from the University of Toronto, where he obtained his PhD in Chemical Physics in 1971. He has been a full professor since 1982. In 2000 he moved to UCSB as Worster Dean of Science. From 2007-2010 he was Chief Technology Officer of API Technologies in NY; and from 2011-2012 Provost at the City College of New York. In 2008 he co-founded Spectra Fluidics, a company that combines SERS with microfluidics to develop high-sensitivity molecular sensing. In 2018 he was employed as a chair professor at Xiamen University.

    Professor Moskovits is a Fellow of the American Association for the Advancement of Science; Fellow of the Optical Society of America; Fellow of the Royal Society of Canada; former member, and past Vice Chair of the US Department of Energy’s Basic Energy Sciences Advisory Committee 2001-2010. He was Guggenheim Fellow in 1987; 1993 Gerhard Herzberg Award of the Spectroscopy Society of Canada; 1993 Royal Society of Chemistry (London) award in Surface and Colloid Science; 1995 Johannes Marcus Marci Medal of the Czech Spectroscopy Society; 2008 NanoTech Briefs, Nano 50 Innovator award; 2010 Ellis Lippincott Award of the Optical Society of America.

    His research interests include surface-enhanced Raman spectroscopy (SERS), generally and more recently as applied to biosensing, plasmonics for sustainable energy and nanomaterials and nanoelectronics.

    Professor Moskovits as a pioneer of surface-enhanced Raman spectroscopy, has made great contribution to SERS, such as revealing the localized surface plasmon resonance origin of SERS, long-term insisting of the importance of nanogap or nanocrevice which supports high local electromagnetic field for enhancing Raman spectroscopy. He has published 320+ papers, the total citation exceeds 24，000. Some of the paper has ultrahigh citation numbers, such as the famous SERS paper published on Reviews of Modern physics (5200+ times). And there are 14 papers whose citation exceed 500 times. His H-index is 87.