受我校国际合作与交流基金聘请项目的资助，化工与化学学院电化学工程系张锦秋副教授邀请美国弗吉尼亚大学（University of Virginia）的Giovanni Zangari教授于2017年3月5日至12日期间在我校进行学术交流。Zangari教授是国际电化学学会电化学材料科学部的主席，兼任美国电化学会会士，在合金电沉积技术、微/纳米电子材料、磁性材料、以及能量转换应用等领域开展研究工作。
报告题目：Electrodeposition of Alloys: an Overview and Advances
主要内容：Electroplating is a powerful technology for production of metallic coatings. Alloy electroplating in particular may enhance properties and enable novel functions, in micro- as well as macro-scale applications. Unfortunately, process control is more difficult with alloys, as exemplified by the limited set of alloys currently used in production environments. A thermodynamic approach to alloy electroplating, which uses the enthalpy of formation to control composition and structure, can provide insight into the mechanisms of structure formation and microstructure control in alloys, suggesting innovative ways to develop alloy plating processes.
报告题目：Electrodeposition of magnetic films and nanostructures with large magnetic anisotropy for magnetic recording and microsystems
主要内容：Alloys of Pt with metals of the Fe group form various phases with large magnetic anisotropy (above 1 MJ/m3), in particular the L10 phases of equiatomic Fe-Pt and Co-Pt, and the hexagonal phases of Co-rich Co-Pt. These alloys are promising candidates for permanent magnets in magnetic MEMS or magnetic storage media. Electrochemical growth of magnetic films presents unique advantages, including control of the driving force for film growth to tune properties, and the ability to from micro- or nano-structures of high aspect ratio via purely additive processes. This talk will discuss the electrochemical synthesis, structural characterization and magnetic properties of equiatomic Fe-Pt and Co-rich Co-Pt alloy films, highlighting unique features afforded by electrochemical processing.
报告题目：Characterization and performance of Cu2ZnSnS4 absorber layers via sulfurization of electrodeposited Cu-Zn-Sn precursors for photovoltaic applications
主要内容：Photovoltaic devices are currently among the fastest growing alternative energy technology. Cu2ZnSnS4 (CZTS) absorber films are promising for high-performance solar cells due to their high absorption coefficient and suitable direct band gap. The record efficiency for CZTS(Se) is around 12%, but the theoretical value is > 30%, potentially allowing vast improvements. This work aims to correlate bulk and surface phase purity and crystal quality with CZTS performance in order to rationally enhance efficiency. CZTS films were grown by electrodeposition of Cu-Zn-Sn alloys from two distinct chemistries – acidic citrate and alkaline pyrophosphate – and via different geometric configurations, followed by sulfurization at high temperature.
报告题目：Hydrogen from Sunlight – Photoelectrochemical Water Splitting with Modified TiO2 Nanotubes
主要内容：Solar energy is one of the few energy sources capable of meeting the world’s energy demands; however, the transient nature of sunlight necessitates the development of technologies to store that energy for on-demand use to supplement photovoltaics. Photoelectrochemical (PEC) solar cells use sunlight to electrolyze water and produce hydrogen as a potential energy vector. TiO2 nanotubes formed by the anodization of titanium foils in electrolytes containing fluoride ions produce aligned arrays of tube-like structures 70-100 nm in width and tunable length on the order of microns.
报告题目：Low Voltage Electrowetting-on-Dielectric (EWOD) for Microfluidic Systems
主要内容：Fluid manipulation in microfluidic applications poses significant challenges, due to the dominance of surface forces at large surface-to-volume ratios. An alternative means to the conventional use of on-chip micropumps exploits electrowetting, i.e. the control of wettability by an applied electric field. This phenomenon has been utilized in a variety of devices, including electro-optic displays, electronic paper, and variable focus lenses. This talk will describe the electrochemical formation of metal oxide films as candidate material for the primary dielectric layer in electrowetting-on-dielectric (EWOD) systems, in combination with fluoropolymers.
Giovanni Zangari is currently a professor of materials science at the University of Virginia. He received his M.Sc. in Nuclear Engineering from Politecnico di Milano and his Ph.D. in Metallurgical Engineering from the Politecnico di Torino, both from Italy. Before coming to Virginia, he was a post-doc at Carnegie Mellon University and an assistant, then associate professor at the U. of Alabama, Tuscaloosa. His research activities lie at the intersection of materials science and electrochemistry; in particular, his group is focused on developing the fundamental science and processing knowledge to tailor materials for micro/nano-electronics, magnetics, and most recently energy conversion applications. Current interests encompass the fundamentals of alloy electrodeposition, the synthesis of semiconductor materials for energy applications, the tailoring of electron transport properties in dielectric oxides, and the design of novel magnetic storage devices. Prof. Zangari has published more than 160 articles and has co-authored a book on electrodeposition science and technology. He is the Chair of the Electrochemical Materials Science Division of the International Society of Electrochemistry, and a Fellow of the Electrochemical Society.