报告题目：Recent Developments in Large Area Graphene Growth
报 告 人：Prof. Loh Kian Ping (新加坡国立大学)
Graphene, a single-layer hexagonal lattice of carbon atoms, has attracted worldwide attention because of its extraordinary properties. The strong interest in graphene has been sustained by the scalable production of high-quality graphene and graphene devices. In this talk, we will discuss the latest development in the 2D Materials Research Group in NUS on the face-to-face growth and transfer of graphene on large scale silicon wafers. To enable graphene plasmonics in the mid-IR, block copolymer lithography was applied to fabricate a large-scale graphene nanodot array (centimeter scale) with controllable sizes in a high-throughput manner. The graphene nanodot array exhibited strong plasmonic resonances in the mid-IR region and broadband electric field enhancement. Plasmon-enhanced IR spectroscopy showed greater than 10-fold vibrational enhancement for self-assembled monolayer molecules and picomolar detection sensitivity for ssDNA oligomers. Reliable sensitivity and selectivity in the detection of metal ions were also demonstrated.
The growth of mosaic nanocrystalline graphene film showing high mobility and quantum hall effect at room temperature was also demonstrated. To understand the structure of grain boundaries, scanning tunneling microscopy (STM) was applied to study periodic grain boundaries in monolayer graphene grown on a weakly interacting Cu(111) crystal. The periodic grain boundaries are formed after the thermal reconstruction of aperiodic boundaries, their structures agree well with the prediction of the coincident-site-lattice (CSL) theory. It is surprising that mosaic nanocrystalline graphene films, despite its high density of sinuous GB, possess fingerprints of high quality graphene film like quantum hall effect and high charge carrier mobility, although it differs from conventional CVD graphene in showing a sizable transport gap.
References：1. L. Gao, A. C. Neto, K. P. Loh，Face to Face Transfer of CVD Graphene Films On Silicon Wafer，Nature 505,190-194 (2014)；2. B. Yang, H. Xu , J. Lu , K. P. Loh，Periodic Grain Boundaries Formed by Thermal Reconstruction of Polycrystalline Graphene Film，J. Am. Chem. Soc.136,12041-12046(2014).
个人简历： Loh Kian Ping is full professor of chemistry and head of chemistry department at NUS, founding member of Graphene esearch Center. He received BSc(Hons) in NUS (1994), and Ph.D. in University of Oxford (1996). 1996-1998, he worked as a postdoctoral research fellow in National Institute for Research in Inorganic Materials, Japan. So far, he received many awards in his career, including President’s Science Award (2014), ACS NANO Lectureship award (2013), University Outstanding Researcher Award (2012), Faculty Outstanding Scientist Award (2011), Dean’s Chair Professorship Award (2010), et al. He also serves as Associate Editor of Chemistry of Materials, International Advisory Panel for Advanced Functional Materials, Associate Editor of Diamond and Related Materials, Advisory panel for Advanced Optical Materials, Editorial Board for 2D-Materials, Adjunct Senior scientist, Institute of Materials Research and Engineering (IMRE), and Faculty Associate, Institute of Microelectronics (IME). He has published more than 300 papers (H index = 48, Citation count 10,000++). His research interesting includes advanced functional carbon materials, organic hybrids and molecular electronics, optoelectronics of 2-D films, carbon science at the atomic domains. More Details at: http://staff.science.nus.edu.sg/~thecarbonlab/index.html