期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 134, 期 27, 页码 11068-11071出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja302717u
关键词
-
资金
- Natural Science and Engineering Research Council (NSERC)
- Canada Foundation for Innovation (CFI)
- British Columbia Knowledge Development Fund (BCKDF)
We demonstrate a novel epitaxial layer-by-layer growth on upconverting NaYF4 nanocrystals (NCs) utilizing Ostwald ripening dynamics tunable both in thickness and composition. Injection of small sacrificial NCs (SNCs) as shell precursors into larger core NCs results in the rapid dissolution of the SNCs and their deposition onto the larger core NCs to yield core shell structured NCs. Exploiting this NC size dependent dissolution/growth, the shell thickness can be controlled either by manipulating the number of SNCs injected or by successive injection of SNCs. In either of these approaches, the NCs self-focus from an initial bimodal distribution to a unimodal distribution (sigma < 5%) of core shell NCs. The successive injection approach facilitates layer-by-layer epitaxial growth without the need for tedious multiple reactions for generating tunable shell thickness, and does not require any control over the injection rate of the SNCs, as is the case for shell growth by precursor injection.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据