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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.


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Summary plots and SEM images. Summary plots of (a) AH, (b) LD, (c) AD, and (d)Rq of the self-assembled Au droplets on GaAs (511)B as a function of DA. (e-h) SEM images of the resulting Au droplets with the DAs as labeled.
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Figure 8: Summary plots and SEM images. Summary plots of (a) AH, (b) LD, (c) AD, and (d)Rq of the self-assembled Au droplets on GaAs (511)B as a function of DA. (e-h) SEM images of the resulting Au droplets with the DAs as labeled.

Mentions: Figure 7 shows the self-assembled Au droplets fabricated on GaAs (511)B, and the results are summarized with the AFM images in Figure 7a,b,c,d,e,f, the line profiles in Figure 5a,b,c,d,e,f, the FFT power spectra in Figure 5a-1,b-1,c-1,d-1,e-1,f-1, the summary plots of the size and density as well as the Rq in Figure 8a,b,c,d, and finally the SEM images in Figure 8e,f,g,h. Overall, the self-assembled Au droplets on GaAs (511)B showed a similar evolution tendency to that of the GaAs (211)B in terms of the AH, LD, AD, and Rq as plotted in Figure 8. Namely, the dimensions of the Au droplets including the AH and LD were gradually increased, while the AD was continuously decreased as a function of the DA. For example, while the DA was varied from 2 to 12 nm, the AH of droplets was increased by × 3.45 from 22.2 to 76.7 nm and the LD by × 3.79 from 85.1 to 323.2 nm as clearly shown in Figure 8a,b. The corresponding AD was dropped by × 103.2 from 3.2 × 1010 to 3.1 × 108 cm-2 as shown in Figure 8c. The FFT pattern started with a relatively larger round shape with 2-nm DA in Figure 5a-1 and gradually became smaller in size with the increased DA for the same reason discussed above as shown in Figure 5b-1,c-1,d-1,e-1,f-1. The Rq began with 5.88 nm for 2-nm DA and reached 21.71 nm for 9-nm DA, and then the Rq was decreased to 21.14 nm with 12-nm DA likely due to the dominance of the density decrease.


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)

Summary plots and SEM images. Summary plots of (a) AH, (b) LD, (c) AD, and (d)Rq of the self-assembled Au droplets on GaAs (511)B as a function of DA. (e-h) SEM images of the resulting Au droplets with the DAs as labeled.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 8: Summary plots and SEM images. Summary plots of (a) AH, (b) LD, (c) AD, and (d)Rq of the self-assembled Au droplets on GaAs (511)B as a function of DA. (e-h) SEM images of the resulting Au droplets with the DAs as labeled.
Mentions: Figure 7 shows the self-assembled Au droplets fabricated on GaAs (511)B, and the results are summarized with the AFM images in Figure 7a,b,c,d,e,f, the line profiles in Figure 5a,b,c,d,e,f, the FFT power spectra in Figure 5a-1,b-1,c-1,d-1,e-1,f-1, the summary plots of the size and density as well as the Rq in Figure 8a,b,c,d, and finally the SEM images in Figure 8e,f,g,h. Overall, the self-assembled Au droplets on GaAs (511)B showed a similar evolution tendency to that of the GaAs (211)B in terms of the AH, LD, AD, and Rq as plotted in Figure 8. Namely, the dimensions of the Au droplets including the AH and LD were gradually increased, while the AD was continuously decreased as a function of the DA. For example, while the DA was varied from 2 to 12 nm, the AH of droplets was increased by × 3.45 from 22.2 to 76.7 nm and the LD by × 3.79 from 85.1 to 323.2 nm as clearly shown in Figure 8a,b. The corresponding AD was dropped by × 103.2 from 3.2 × 1010 to 3.1 × 108 cm-2 as shown in Figure 8c. The FFT pattern started with a relatively larger round shape with 2-nm DA in Figure 5a-1 and gradually became smaller in size with the increased DA for the same reason discussed above as shown in Figure 5b-1,c-1,d-1,e-1,f-1. The Rq began with 5.88 nm for 2-nm DA and reached 21.71 nm for 9-nm DA, and then the Rq was decreased to 21.14 nm with 12-nm DA likely due to the dominance of the density decrease.

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