Journal
NANO LETTERS
Volume 18, Issue 10, Pages 6427-6433Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.8b02819
Keywords
Liquid cell TEM; in situ TEM; nanodendrite; dendrite theories; seaweed growth; tip splitting
Categories
Funding
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division within the insitu TEM program [DE-AC02-05-CH11231, KC22ZH]
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
- KAUST CRG grant at UC Berkeley
- Ministry of Science and Technology (MOST) in Taiwan [103-2917-I-009-185]
- MOST in Taiwan [NSC 102-2119-I-009-502]
- National Basic Research Program of China [2013CB632101]
- China Scholarship Council [201406190080]
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Formation mechanisms of dendrite structures have been extensively explored theoretically, and many theoretical predictions have been validated for micro- or macroscale dendrites. However, it is challenging to determine whether classical dendrite growth theories are applicable at the nanoscale due to the lack of detailed information on the nanodendrite growth dynamics. Here, we study iron oxide nanodendrite formation using liquid cell transmission electron microscopy (TEM). We observe seaweed-like iron oxide nanodendrites growing predominantly in two dimensions on the membrane of a liquid cell. By tracking the trajectories of their morphology development with high spatial and temporal resolution, it is possible to explore the relationship between the tip curvature and growth rate, tip splitting mechanisms, and the effects of precursor diffusion and depletion on the morphology evolution. We show that the growth of iron oxide nanodendrites is remarkably consistent with the existing theoretical predictions on dendritic morphology evolution during growth, despite occurring at the nanoscale.
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