(a-2) to (d-2) are cross-sectional surface line profiles acquired

(a-2) to (d-2) are cross-sectional surface line profiles acquired from the white lines in (a-1) to (d-1), and (a-3) to (d-3) show the 2-D FFT power spectra. Height distribution histograms are shown in (a-4) to (d-4). Figure 3 shows the evolution LDN-193189 cost of self-assembled Au droplets with further increased T a between 400°C and 550°C on GaAs (111)A. AFM top-view images in Figure 3a,b,c,d show the large areas of 3 × 3 μm2, and the insets of Figure 3 (a-1) to (d-1) are the enlarged areas of 1 × 1 μm2.

The surface line profiles in Figure 3 (a-2) to (d-2), the FFT power spectra in Figure 3 (a-3) to (d-3), and the height distribution histograms (HDHs) in Figure 3 (a-4) to (d-4) are respectively presented. Figure 4 shows the summary plots of

the average height (AH) Ilomastat nmr in Figure 4a, the lateral diameter (LD) in Figure 4b, and the average density (AD) in Figure 4c of the self-assembled Au droplets at each T a on various GaAs substrates. Table 1 summarizes the corresponding values. In general, between 400°C and 550°C, the self-assembled dome-shaped Au droplets were successfully fabricated as shown in Figure 3. Due to the enhanced diffusion of Au adatoms at increased thermal energy, given E a > E i, the wiggly Au nanostructures preferentially evolve into the dome-shaped Au droplets to minimize the surface energy [35]. In terms of the size and density evolution, as clearly shown in Figure 4a,b,c, the size including the AH and LD of the Au droplets was gradually increased, while the density was correspondingly decreased as a function of the T a on GaAs (111)A. In more detail, at an increased T a of 400°C, www.selleckchem.com/products/PD-173074.html Finally, the self-assembled Au droplets were fabricated and we can clearly observe the apparent transition from the wiggly Au nanostructures at 350°C to the dome-shaped Au droplets at

400°C. The AH was 23.4 nm, the LD was 128.6 nm, and the AD was 1.39 × 1010 cm−2 as shown in Table 1. The HDH was approximately ±15 nm as shown in Figure 3 (a-4). At 450°C, the Au droplets grew larger in size and showed a lower density as shown in Figure 4. The AH see more was increased by × 1.09 and became 25.4 nm, and the LD was increased by × 1.04 and became 133.8 nm as shown in Table 1. The density was dropped by × 1.13 and became 1.23 × 1010 cm−2. Likewise, at 500°C, the size of the Au droplets was further increased, and the density was correspondingly decreased as shown in Figure 3c. The AH and LD were increased by × 1.14 and × 1.04 and became 28.9 and 138.5 nm, respectively, while the AD was decreased by × 1.04 and became 1.23 × 1010 cm−2. The HDH was now further extended with the increased size to over ±20 nm as shown in Figure 3 (c-4).

Comments are closed.