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Dr Qi Zhang has a BSc in the field of Electrochemistry, an MSc in Inorganic Materials and a PhD in Sol-Gel Chemistry. He joined the Nanotechnology Centre at Cranfield University as a post-doctoral Research Officer in January 1996 following the completion of his PhD at Monash University. His first projects at Cranfield involved the development of sol-gel ferroelectric thin and thick films for the pyroelectric applications. In 1998 he was promoted to the position of senior research fellow, and then to Senior Lecturer in January 2007. Dr Zhang has been responsible for the growth of the materials on Microsystems and Nanotechnology and runs a research group that focuses on materials fabrication and the applications of nanoengineered materials to devices. He has over 15 years experience in the fabrication of nanostructured materials through sol-gel techniques, particularly in the fabrication of nano- or micro-particles with core-shell structure and thin and thick films. Recently he has been leading a group working in the fabrication of metal or metal oxide nanoparticles for their applications in micro engineering and nanotechnology. He is a Fellow in IOM3 and a chartered scientist in the Science Council. He has published more than 90 papers in refereed journals and conferences. He is a PI on current grant Exploring Giant Electrocaloric Effect and a CoI on current grant Integrated functional materials for system-in-package Ã applications He is also a Recognized Researcher on current grant PLATFORM GRANT RENEWAL: Nanoscale Multifunctional Ferroic Materials and Devices
Large electrocaloric (EC) effect with a broad operational temperature range is required and attractive in solid-state cooling devices. In this work, a giant EC effect (?T~20.7K) in a broad temperature range (~ 110 K) was demonstrated in relaxor antiferroelectric (AFE) Pb0.97La0.02(Zr0.65Sn0.3Ti0.05) O3 (PLZST) sol-gel thin film. The use of the LaNiO3/Pt composite bottom electrode may cause the in-plane residual thermal tensile stress during the layer-by-layer annealing process, which may be responsible for the large positive EC effect. The coexistence of nanoscale multiple FE and AFE phases leads to the great dielectric relaxor dispersion around the dielectric peak, which may be ascribed to the broad EC operational temperature range. These newly-discovered properties in the PLZST thin films suggest this multifunctional material having a great potential for applications in modern solid-state cooling.