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2D Layered Materials: Manipulating Electrons, Phonons, Wrinklons and Ions

Wenzhong Bao
Postdoctoral Researcher
University of Maryland College Park

Date and Time: 

March 31, 2014 - 11:00am to 12:00pm

Location: 

Gunness

Host: 

Qiangfei Xia

Contact the host: 

Recently, there has been enormous progress in the study of 2D layered materials which can be viewed as individual planes of atomic-scale thickness exfoliated from bulk crystals like graphite, h-BN, several transition metal dichalcogenides (TMD), complex oxides, etc. The unique electronic structures, atomic thickness, mechanical strength and flexibility of these materials offers new opportunities to realize new materials properties with the interplay of electronic, magnetic, mechanical, chemical, and optical phenomena. This presentation will first summarize my previous works in this field, including electrical/thermal transport studies of graphene/MoS2 and the morphology manipulation of suspended membrane via electrostatic and thermal control. Then I will focus on our latest progress of alkali metal intercalation in layered materials, e.g. we measure simultaneous in-situ optical transmittance spectra and electrical transport properties of few-layer graphene (FLG) nanostructures upon electrochemical lithiation/delithiation. Reversible Li-intercalation stages and a two-phase boundary are observed optically. Due to the unusual electronic structure of FLG, upon intercalation we observe a simultaneous increase of both optical transmittance and DC conductivity, strikingly different from other materials, and shed light on its application for next generation transparent electrodes.

Bio: 

Wenzhong Bao graduated from Nanjing University with a BS in physics (2006). He received his PhD from the University of California, Riverside (2011), having studied in the Department of Physics and Astronomy. He is currently a postdoctoral researcher in Prof. Michael Fuhrer's group (and co-supervised by Prof. Liangbing Hu from MSE since 2013) at the University of Maryland, College Park. His research interests cover both fundamental and applied aspects of novel low-dimensional materials