Functional nanoparticle coatings deposited by aerosol impaction

Body: 

Abstract: Nanomaterials must be arranged in a thin film or coating to be employed in applications ranging from gas sensors to antibacterial fabrics. Present coatings are frequently deposited from colloidal nanomaterial solutions using spinning, printing, or dipping techniques, and the resulting coating quality depends on the interplay of the solvent, nanomaterial, and substrate chemistries. In this talk, I will introduce an alternative deposition approach in which aerosolized nanomaterials are accelerated by a supersonic gas jet and impact a substrate. The technique is agnostic with regards to nanomaterial and substrate composition and geometry, and it affords intimate control of coating thickness and porosity, making it broadly applicable. I will also discuss the properties of illustrative coatings composed of semiconductor, oxide, and metal nanoparticles intended for use in optoelectronic devices, windows, and water-filtration membranes.

 

Biography:  Zachary Holman is an Assistant Professor and an ASU Trustees Professor in the School of Electrical, Computer, and Energy Engineering at Arizona State University. He received his Ph.D. in Mechanical Engineering from the University of Minnesota for his work on plasma-synthesized silicon and germanium nanocrystals, after which he spent two years as a postdoctoral researcher developing high-efficiency silicon solar cells at EPFL in Switzerland. His research group at ASU focuses on new materials and device designs for high-efficiency silicon solar cells and silicon-based tandem solar cells. He is also the co-founder of an advanced materials start-up company, Swift Coat.

Semester: 
0
Date: 
September 11, 2017
Speaker: 
Professor Zachary Holman
Affiliation: 
Arizona State University
Year: 
2017
Host: 
Dr. Jimmy Liu