Figure 4.
Effect of AuNP concentration. HR-TEM images: AuNPs synthesized using green tea extract as a reducing agent (a) and pipetted on mica substrate (b). The width and height of fabricated nanoribbon (c) were 31.07 nm and 5 nm, respectively. AFM amplitude error and phase images: With the original solution, a frequency of 1 MHz, a peak-to-peak voltage Vpp of 1 V, the AuNPs were aligned but failed to form continuous nanoribbons (d,g). With a twice-diluted solution, a frequency of 100 kHz, and a maximum voltage of 5 V, nanoribbons or nanoleaves are formed (e,h). When the solution is 5-times diluted at a frequency of 100 kHz and a maximum voltage of 5 V, no more nanoleaves are formed (f,i).