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Fabrication of self-assembled Au droplets by the systematic variation of the deposition amount on various type-B GaAs surfaces.

Sui M, Li MY, Kim ES, Lee J - Nanoscale Res Lett (2014)

Bottom Line: Under an identical growth condition, the self-assembled Au droplets of mini to supersizes are successfully synthesized via the Volmer-Weber growth mode.Depending on the DA, an apparent evolution is clearly observed in terms of the average height (AH), lateral diameter (LD), and average density (AD).In addition, accompanied with the dimensional expansion, the AD of Au droplets drastically swings on 2 orders of magnitudes from 3.2 × 10(10) to 4.2 × 10(8) cm(-2).

View Article: PubMed Central - HTML - PubMed

Affiliation: College of Electronics and Information, Kwangwoon University, Nowon-gu Seoul 139-701, South Korea.

ABSTRACT
The fabrication of self-assembled Au droplets is successfully demonstrated on various GaAs (n11)B, where n is 2, 4, 5, 7, 8, and 9, by the systematic variation of the Au deposition amount (DA) from 2 to 12 nm with subsequent annealing at 550°C. Under an identical growth condition, the self-assembled Au droplets of mini to supersizes are successfully synthesized via the Volmer-Weber growth mode. Depending on the DA, an apparent evolution is clearly observed in terms of the average height (AH), lateral diameter (LD), and average density (AD). For example, compared with the mini Au droplets with a DA of 2 nm, AH of 22.5 nm, and LD of 86.5 nm, the super Au droplets with 12-nm DA show significantly increased AH of 316% and LD of 320%, reaching an AH of 71.1 nm and LD of 276.8 nm on GaAs (211)B. In addition, accompanied with the dimensional expansion, the AD of Au droplets drastically swings on 2 orders of magnitudes from 3.2 × 10(10) to 4.2 × 10(8) cm(-2). The results are systematically analyzed with respect to the atomic force microscopy (AFM) and scanning electron microscopy (SEM) images, energy-dispersive X-ray spectrometry (EDS) spectra, cross-sectional line profiles, Fourier filter transform (FFT) power spectra, and root-mean-square (RMS) roughness as well as the droplet dimension and density summary, respectively.

No MeSH data available.


Related in: MedlinePlus

Illustration of self-assembled Au droplet evolution on GaAs (211)B as a function of deposition amount (DA). (a) Bare GaAs surface. (b) After 3-nm Au deposition. (c) Au droplets with 3-nm DA. (d) Au droplets with 6-nm DA. (a-1) - (d-1) Line profiles of the cross sections marked with the white lines on AFM top views.
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Figure 1: Illustration of self-assembled Au droplet evolution on GaAs (211)B as a function of deposition amount (DA). (a) Bare GaAs surface. (b) After 3-nm Au deposition. (c) Au droplets with 3-nm DA. (d) Au droplets with 6-nm DA. (a-1) - (d-1) Line profiles of the cross sections marked with the white lines on AFM top views.

Mentions: In this paper, we thus demonstrate the fabrication of self-assembled Au droplets on various GaAs (n11)B, where n is 2, 4, 5, 7, 8, and 9 via the systematic variation of the Au deposition amount (DA). As an example, the simplified fabrication process of the self-assembled Au droplets on GaAs (211)B via the Volmer-Weber growth mode [32-34] is illustrated in Figure 1. Staring from the bare GaAs (211)B in Figure 1a, the surface still showed a quite smooth surface topography even after the 6-nm Au deposition as shown in Figure 1b,b-1. After a systematic annealing process, the resulting Au droplets are shown with the 3-nm deposition in Figure 1c and 6-nm DA in Figure 1d. Under an identical growth condition, the self-assembled Au droplets show drastically different sizes and densities, and as a function of the DA, a gradual dimensional expansion including the average height and the average diameter was clearly observed while the average density swings over 2 orders of magnitude. On the various substrates utilized, a similar trend of the evolution process was clearly observed while showing minor index dependency.


Fabrication of self-assembled Au droplets by the systematic variation of the deposition amount on various type-B GaAs surfaces.

Sui M, Li MY, Kim ES, Lee J - Nanoscale Res Lett (2014)

Illustration of self-assembled Au droplet evolution on GaAs (211)B as a function of deposition amount (DA). (a) Bare GaAs surface. (b) After 3-nm Au deposition. (c) Au droplets with 3-nm DA. (d) Au droplets with 6-nm DA. (a-1) - (d-1) Line profiles of the cross sections marked with the white lines on AFM top views.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4150864&req=5

Figure 1: Illustration of self-assembled Au droplet evolution on GaAs (211)B as a function of deposition amount (DA). (a) Bare GaAs surface. (b) After 3-nm Au deposition. (c) Au droplets with 3-nm DA. (d) Au droplets with 6-nm DA. (a-1) - (d-1) Line profiles of the cross sections marked with the white lines on AFM top views.
Mentions: In this paper, we thus demonstrate the fabrication of self-assembled Au droplets on various GaAs (n11)B, where n is 2, 4, 5, 7, 8, and 9 via the systematic variation of the Au deposition amount (DA). As an example, the simplified fabrication process of the self-assembled Au droplets on GaAs (211)B via the Volmer-Weber growth mode [32-34] is illustrated in Figure 1. Staring from the bare GaAs (211)B in Figure 1a, the surface still showed a quite smooth surface topography even after the 6-nm Au deposition as shown in Figure 1b,b-1. After a systematic annealing process, the resulting Au droplets are shown with the 3-nm deposition in Figure 1c and 6-nm DA in Figure 1d. Under an identical growth condition, the self-assembled Au droplets show drastically different sizes and densities, and as a function of the DA, a gradual dimensional expansion including the average height and the average diameter was clearly observed while the average density swings over 2 orders of magnitude. On the various substrates utilized, a similar trend of the evolution process was clearly observed while showing minor index dependency.

Bottom Line: Under an identical growth condition, the self-assembled Au droplets of mini to supersizes are successfully synthesized via the Volmer-Weber growth mode.Depending on the DA, an apparent evolution is clearly observed in terms of the average height (AH), lateral diameter (LD), and average density (AD).In addition, accompanied with the dimensional expansion, the AD of Au droplets drastically swings on 2 orders of magnitudes from 3.2 × 10(10) to 4.2 × 10(8) cm(-2).

View Article: PubMed Central - HTML - PubMed

Affiliation: College of Electronics and Information, Kwangwoon University, Nowon-gu Seoul 139-701, South Korea.

ABSTRACT
The fabrication of self-assembled Au droplets is successfully demonstrated on various GaAs (n11)B, where n is 2, 4, 5, 7, 8, and 9, by the systematic variation of the Au deposition amount (DA) from 2 to 12 nm with subsequent annealing at 550°C. Under an identical growth condition, the self-assembled Au droplets of mini to supersizes are successfully synthesized via the Volmer-Weber growth mode. Depending on the DA, an apparent evolution is clearly observed in terms of the average height (AH), lateral diameter (LD), and average density (AD). For example, compared with the mini Au droplets with a DA of 2 nm, AH of 22.5 nm, and LD of 86.5 nm, the super Au droplets with 12-nm DA show significantly increased AH of 316% and LD of 320%, reaching an AH of 71.1 nm and LD of 276.8 nm on GaAs (211)B. In addition, accompanied with the dimensional expansion, the AD of Au droplets drastically swings on 2 orders of magnitudes from 3.2 × 10(10) to 4.2 × 10(8) cm(-2). The results are systematically analyzed with respect to the atomic force microscopy (AFM) and scanning electron microscopy (SEM) images, energy-dispersive X-ray spectrometry (EDS) spectra, cross-sectional line profiles, Fourier filter transform (FFT) power spectra, and root-mean-square (RMS) roughness as well as the droplet dimension and density summary, respectively.

No MeSH data available.


Related in: MedlinePlus