MAE Department - PG Seminar - Progress in Piezoelectric Microelectromechanic Devices for Macro-Micro-Nano Actuations
Different from the traditional electromagnetic principle based microelectromechanic system, piezoelectric microelectromechanical devices involves piezoelectric, ferroelectric, magnetoelectric functional materials and their integration, belongs to the interdisciplinary research field of materials, physics, electronics, and engineering. This lecture will introduce the pioneering research work carried out by Dong’s team in the field of piezoelectric microelectromechanics, including the theory of piezoelectric metamaterials, artificial modes, and electromechanical coupling. We will introduce the working principle of piezoelectric micromotors and actuators; and we will also introduce the important inventions and advances made in our research group in the field of piezoelectric microelectromechanics, including the piezoelectric-electromagnetic dual-mechanism motor, piezoelectric bionic motion motor, and macro-micro-nano motion motor based on artificial mode design, aiming at the nano-actuation core technology required in the industrial application field. Finally, the typical applications and future development prospects of piezoelectric microelectromechanical in core technology fields such as lithography machines and laser communication will be introduced.
Dr. Dong has long been engaged in piezoelectric, ferroelectric, magnetoelectric functional materials and devices, as well as recent research on 3D printing and flexible electronics, piezoelectric metamaterials, and piezoelectric nano-step motors. He has served as an associate professor in the Department of Materials at Tsinghua University, an associate researcher and research professor at the University of Pennsylvania and Virginia Tech. In 2008, he served as a professor at the College of Engineering, School of Materials and Engineering at Peking University. In 2021, he joined the Institute for Advanced Study of Shenzhen University.
In the basic theory of piezoelectricity, Dr. Dong introduced the design idea of ordered functional units of metamaterials into the piezoelectric ceramic system, and realized all non-zero piezoelectric strain coefficient for the first time, breaking the traditional 70-year understanding that piezoelectric ceramic materials have only five non-zero piezoelectric coefficients dij. This breakthrough work was published in Science Advances (2020); In the theory of magnetoelectric functional materials, Dr. Dong created the "magnetic-elastic-electric" coupling theoretical method, which is one of the well-recognized theoretical methods. In the research of piezoelectric micromotors, he invented the world's smallest piezoelectric micromotors, low-temperature actuators, high-temperature piezoelectric motors and high-temperature actuators, and a series of linear piezoelectric motors with micro-nano resolution have been developed; Some of the achievements have been industrialized in Xiamen and successfully applied to the Micius satellite space communication (2018). He has published more than 200 SCI cited articles in international authoritative journals, such as Science Advances, Energy and Environment Science, Advanced Materials, Advanced Functional Materials, Nano Energy, etc., with a total of more than 14650 citations (Google scholar). Dr. Dong has more than 20 piezoelectric microelectromechanical motors with independent intellectual property rights. Dr. Dong has undertaken one national 863 project, one key project of the National Natural Foundation of China and 5 general funds, two key science and technology projects of Beijing, and one key science and technology project of Shenzhen, and a number of enterprise cooperation and joint laboratory projects. Dr. has been selected as a 2% of the world's top scientists (career influence) and one of highly cited scholar in China.