Abstract: An overview is presented for our recent study of graphene nanodevices for various challenging applications. Graphene nano-electro-mechanical (GNEM) device technology is first presented for low-power switching and ultra-sensitive chemical gas sensing applications. Three-terminal GNEM switches with heterogeneously stacked graphene / h-BN layers are developed, which achieve low-voltage and sub-thermal switching (S < 60 mV/dec). We then present nanoscale graphene chemical sensors, which detect either resistance or mass changes due to a small number of gas molecules physisorbed onto suspended graphene at room temperature. With the resistance detection method, we show quantized increments in the temporal resistance, signifying individual CO₂ molecule adsorption. As for the mass detection method, we demonstrate the resonance frequency shift of a doubly-clamped graphene resonator with the mass resolution of hundreds zeotpgram order. After that, state-of-the-art single-nanometer patterning technology of suspended graphene by using helium ion microscope (HIM) is introduced for nanoscale thermal engineering. The graphene nanomesh (GNM) structures with sub-10-nm pore diameter are patterned on large-area suspended graphene. A new Differential Thermal Leakage method is introduced to evaluate heat phonon transport in the asymmetric GNM channels. Remarkable thermal rectification is presented with the rectification ratio of over 80 % at 150 K and 60 % at 250 K along with preliminary discussion on physical mechanism behind the rectification phenomena.

Biography: Hiroshi Mizuta CPhys FInstP FJSAP, received the Ph.D. degree in electrical engineering from Osaka University, Japan, in 1993. He was the Laboratory Manager at the Hitachi Cambridge Laboratory, Cambridge, UK for 1997 – 2003. He was Associate Professor at Tokyo Institute of Technology for 2003 - 2007 and Professor of Nanoelectronics at University of Southampton for 2007 – 2016 (as part-time for 2011-2016) and served as Head of the NANO Group from 2009 - 2011. He is currently Distinguished Professor and Vice President (Special Missions) at Japan Advanced Institute of Science and Technology (JAIST) and Visiting Professor, School of Electronics and Computer Science, University of Southampton.

He has a strong track record in the research on silicon- and graphene-based nanoelectronic devices and nano-electro-mechanical-systems (NEMS). He has led a number of large research projects in the UK and Japan. He was awarded for 2018 Commendation for Science and Technology by the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan for his research achievements on ‘Hybrid Electro-Mechanical Functional Devices at Nanoscale’. He has published over 620 peer-reviewed scientific papers and filed over 55 patents. He has also authored books and chapters, including “Physics and Applications of Resonant Tunnelling Diodes”, Cambridge University Press. Professor Mizuta is Fellow of the Japan Society of Applied Physics, Fellow of the Institute of Physics (IOP). For 2002-2016, he also served as a member of the International Advisory Board of the MacDiarmid Institute for Advanced Materials and Nanotechnology, New Zealand Centres of Research Excellences (CoREs).