Unusual Rh nanocrystal morphology control by hetero-epitaxially growing Rh on Au@Pt nanowires with numerous vertical twinning boundaries
- Authors
- An, Hyohyun; Nguyen Tien Khi; Yoon, Jisun; Lee, HyunKyung; Baik, Hionsuck; Sohn, Jeong-Hun; Lee, Kwangyeol
- Issue Date
- 2015
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- NANOSCALE, v.7, no.18, pp.8309 - 8314
- Indexed
- SCIE
SCOPUS
- Journal Title
- NANOSCALE
- Volume
- 7
- Number
- 18
- Start Page
- 8309
- End Page
- 8314
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/96373
- DOI
- 10.1039/c5nr00999e
- ISSN
- 2040-3364
- Abstract
- Simultaneously growing multiple nanocrystallites in a crowded space can cause a shortage of precursors, and this can lead to a vertical growth of nanocrystallites on a given substrate. The presence of surfactant-surfactant interactions among adjacent nanocrystals can also place a unique structural constraint on the growing nanocrystallites, resulting in novel nanocrystal facet control. Herein, we report the growth of Rh on Au@Pt nanowires with multiple twinning boundaries, which are found along the entire nanowire length. The Au@Pt nanowires exhibit numerous bead-like structures, resulting from the preferred Pt deposition on the twinning boundaries, which can serve as nucleation sites for Rh. The heteroepitaxial growth of Rh on the Au@Pt nanowires results in unusual crystal growth behaviours. First, novel morphologies of Rh nanorods, nanoplates, and tangled manes are obtained temperature-dependently, which are not obtained in the absence of the Au@Pt nanowire substrate. Secondly, the thickness of vertically grown nanorods and nanoplates is tightly controlled. We also report the structure-catalytic activity relationship on the catalytic hydrogenation of phthalimides by the new Rh nanostructures.
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