Dr. Haimei Zheng, PI
Senior Staff Scientist
MSE, UC Berkeley
My research interests are centered on understanding how nanoscale heterogeneity and fluctuations control physical and chemical processes of materials. With the development and applications of in situ liquid phase transmission electron microscopy, we study nucleation, growth and structural transformations of materials at the atomic level, dynamic phenomena at solid-liquid (e.g., electrode-electrolyte) interfaces, and catalysis. The insights garnered enable designing novel materials for applications in functional devices.
We are fortunate to have access to the advanced facilities, such as the state-of-art TEM, nanofabrication, advanced X-ray, and supercomputing facilities at LBNL. We interact with scientists who have the most creative mind and we are open to collaborations and discussions with you!
• Imaging, understanding and controlling of Li dendrite growth. Li nanogranular growth was achieved by coating the electrodes in a liquid cell with a cationic (PDDA) polymer film. Liquid cell TEM is remarkable in revealing the mechanisms of Li dendrite suppression. In situ EDS chemical analysis of solid electrolyte interphase (SEI) on an individual nanograin was achieved for the first time. EES 13, 1832 (2020).
• Haimei was selected to receive 2019 MRS Medal Award. (Link)
• We discovered novel mechanisms of 2D materials growth in solution using liquid cell TEM, Nature Materials 18, 970 (2019). (Link)
• Dynamic deformability of individual PbSe nanocrystal during superlattice phase transitions was revealed through liquid cell TEM in Science Advances, 5, eaaw5623 (2019). (Link)
• We developed novel MoS2 liquid cells through a facile polymer-free 2D MoS2 transfer process (2019). (Link)