Precise control of configuration, size and density of self-assembled Au nanostructures on 4H-SiC (0001) by systematic variation of deposition amount, annealing temperature and durationElectronic supplementary information (ESI) available. See DOI: 10.1039/c5ce02439k
Precise control over the configuration, size and density of Au nanoparticles (NPs) has offered an efficient route to enhance and optimize the performance and usability of various NP-based applications. In this study we successfully demonstrate precise control of the configuration, size and density o...
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Main Authors | , , , , , , |
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Format | Journal Article |
Published |
08.05.2016
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Online Access | Get full text |
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Summary: | Precise control over the configuration, size and density of Au nanoparticles (NPs) has offered an efficient route to enhance and optimize the performance and usability of various NP-based applications. In this study we successfully demonstrate precise control of the configuration, size and density of self-assembled Au nanostructures on 4H-SiC (0001)
via
systematic variation of the deposition amount, annealing temperature and duration. Depending on the deposition amount at a fixed annealing temperature and duration, the self-assembled Au NPs are successfully fabricated based on the Volmer-Weber growth model, and the NPs nucleate as round dome shapes and evolve into hexagonal nano-crystals with facet formation along with the increased deposition amounts. For the variation of annealing temperature, the Au nanostructures radically develop into two distinct regimes:
i.e.
irregular Au nano-mounds (regime I) between 400 and 700 °C based on the diffusion limited agglomeration (DLA) model and round dome-shaped droplets (DPs) (regime II) between 750 and 1000 °C. The dwelling time, size and density evolution of the round dome-shaped Au DPs are discussed based on the Ostwald ripening theory.
Hexagonal Au nano-crystals, round dome-shaped droplets and irregular nano-mounds were fabricated on GaN (0001) based on the combinational effects of thermal dewetting and surface free energy minimization. |
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Bibliography: | 10.1039/c5ce02439k Electronic supplementary information (ESI) available. See DOI |
ISSN: | 1466-8033 |
DOI: | 10.1039/c5ce02439k |