Professor,Huazhong University of Science and Technology
High-resolution Electrohydrodynamic Printing Technology and Its Applications in Flexible/Stretchable Electronics
Electrohydrodynamic (EHD) printing, which adopts electric field force to pull fluid flows from microcapillary nozzles, is becoming a promising technology for flexible electronics manufacture due to its unique advantages of high-resolution (50 nm) and compatibility with wide range of inks (1-10000 cps). In EHD printing process, three types of printing mode that are E-jet printing, EHD direct-writing, and electrospray, can be switched through process adjustment to deposit dots, fiber/line or curved fiber/line and thin film directly. Specially, the EHD direct-writing technology enables large-scale deposition of highly aligned nanofibers in an additive, noncontact, real-time adjustment, and individual control manner on rigid or flexible, planar or curved substrates, making it rather attractive in the fabrication of flexible electronics. In this presentation, I introduce our recent researches on EHD direct-writing techniques, including the basic principles, alignment strategies and EHD printing equipment. Several attractive applications in flexible electronics are also presented herein, and the future prospects are suggested to advance flexible electronics based on orderly arranged EHD direct-written fibers. This technology overcomes the limitations on the resolution of fabrication and viscosity of ink of conventional inkjet printing, and represents major advances in manufacturing of flexible electronics.
YongAn Huang received the B.S. and M.S. degrees in structural engineering in 2001 and 2004, and Ph.D. degree in Engineering Mechanics in 2007, from Northwestern Polytechnical University, Xian, China, respectively. He was a Visiting Scholar at Northwestern University (USA) in 2012. He is a Professor with the State Key Laboratory of Digital Manufacturing Equipment and Technology and the School of Mechanical Science and Engineering at Huazhong University of Science and Technology. Since 2005, he has been Vice Head of the Flexible Electronics Research Center at HUST. He has coauthored three books and over 70 international journal papers. His research interests are focused on Flexible/Stretchable Electronics, Laser lift-off and Transfer Printing, and Electrohydrodyanmic Printing.
The Huazhong University of Science and Technology (HUST) is a national key university directly under the administration of the Ministry of Education of P. R. China, and is among the first Universities joining the national “211 Project” and “985 Project”. HUST has eleven disciplines: engineering, medicine, management, science, philosophy, economics, law, education, literature, history and agriculture, offering a variety of degree programs, including 86 undergraduate programs, 256 graduate programs, 181 PhD programs. HUST covers an area of over 1,153 acres with picturesque environment, elegant surroundings and has 72% greenery coverage, which has been honored as the “University in the Forest”.