Journal
NANO LETTERS
Volume 14, Issue 11, Pages 6639-6643Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl5032919
Keywords
Crystal bonding; in situ TEM; nanoparticles; nanocrystals; crystal defect
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Funding
- Singapore National Research Foundation's Competitive research program [NRF-CRP9-2011-04]
- Electron Microscopy Facility at Center for Bioimaging Science, National University of Singapore
- Lee Kuan Yew endowment fund
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Nanocrystal bonding is an important phenomenon in crystal growth and nanoscale welding. Here, we show that for gold nanocrystals bonding in solution can follow two distinct pathways: (1) coherent, defect-free bonding occurs when two nanocrystals attach with their lattices aligned to within a critical angle; and (2) beyond this critical angle, defects form at the interfaces where the nanocrystals merge. The critical misalignment angle for similar to 10 nm crystals is similar to 15 degrees in both in situ experiments and full-atom molecular dynamics simulations. Understanding the origin of this critical angle during bonding may help us predict and manage strain profiles in nanoscale assemblies and inspire techniques toward reproducible and extensible architectures using only basic crystalline blocks.
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