(7cv) Self-Aligned Strategies for Printed Electronics

My research focuses on nano/micro manufacturing with printing techniques and advanced nanomaterials for flexible electronics. At University of Minnesota, I have been developing novel printing processes compatible with roll-to-roll systems for continuous manufacturing of flexible electronics. These include self-aligned inkjet printing based on capillary action of liquid inks in microfluidic channels, high-resolution screen printing with silicon stencils, and rapid photonic annealing with intensive pulsed light. In addition to developing printing processes, I have been studying electrical and mechanical properties of nanomaterials (e.g., graphene, silver) printed on flexible substrates, and demonstrating fully-printed flexible electronics using the processes and nanomaterials. This research has established practical printing strategies for manufacturing flexible electronics in a low-cost and high-through manner.

I will pursue my research interests in printed and flexible electronics for my future research group. My group will lead the research field by developing novel processes, using advanced materials, designing high-performance devices, and pioneering new application areas. The research projects that my group will first work on include, but will not be limited to, microfluidics for self-aligned printing and novel device architectures of electronic devices, nano/micro 3D structuring of electronic materials by 2D printing, and printed electronic sensors for healthcare application. This future research will provide many opportunities to obtain research grants and induce extensive collaborations within the university and across the country.

Teaching Interests:

Along with research, teaching is one of the most important roles as a faculty member in academia to transfer the knowledge to others. One of my main motivations for applying to a position in academia, rather than industry, is the opportunities to educate, advise, and inspire students. To be a good teacher, I have made strong efforts to build diverse teaching experiences in classes and laboratories during my tenure as a graduate student and postdoctoral scholar. These experiences have helped me create my own teaching philosophy and built my confidence and interest in delivering lectures, developing new courses, and supervising students.

I am prepared to teach a variety of courses for both the undergraduate and graduate programs in Chemical Engineering and Materials Science. In particular, I would be interested in teaching courses on fluid mechanics, transport phenomena, thermodynamics, colloid science, materials processing, and electrical/optical/mechanical properties of materials. Moreover, I would also welcome opportunities to teach other courses in Chemical Engineering and Materials Science, and be delighted to develop new courses for both the undergraduate and graduate programs.

Selected Publications (21 total, 15 first author):

W. J. Hyun, E. B. Secor, C.-H. Kim, M. C. Hersam, L. F. Francis, C. D. Frisbie, Scalable, Self-Aligned Printing of Flexible Graphene Microsupercapacitors, Adv. Energy Mater. 2017, In press (DOI: 10.1002/aenm.201700285).

W. J. Hyun, F. Z. Bidoky, S. B. Walker, J. A. Lewis, L. F. Francis, C. D. Frisbie, Printed, Self-Aligned Side-Gate Organic Transistors with a Sub-5 µm Gate-Channel Distance on Imprinted Plastic Substrates, Adv. Electron. Mater. 2016, 2, 1600293.

W. J. Hyun, E. B. Secor, G. A. Rojas, M. C. Hersam, L. F. Francis, C. D. Frisbie, All-Printed, Foldable Organic Thin-Film Transistors on Glassine Paper, Adv. Mater. 2015, 27, 7058-7064.

W. J. Hyun, E. B. Secor, M. C. Hersam, C. D. Frisbie, L. F. Francis, High-Resolution Patterning of Graphene by Screen Printing with a Silicon Stencil for Highly Flexible Printed Electronics, Adv. Mater. 2015, 27, 109-115.

W. J. Hyun, S. Lim, B. Y. Ahn, J. A. Lewis, C. D. Frisbie, L. F. Francis, Screen Printing of Highly Loaded Silver Inks on Plastic Substrates Using Silicon Stencils, ACS Appl. Mater. Interfaces 2015, 7, 12619-12624.