Selective synthesis of hexagonal Ag nanoplates in a solution-phase chemical reduction process

Abstract

ABSTRACT

Fabrication of silver nanoplates using Nephelium lappaceum (Rambutan) peel: A sustainable approach

“…The hexagonal symmetry of the scattered spots in the SAED pattern (Fig. 2c-d) also suggests the existence of a single crystalline triangle and hexagonal shape nanoplates bounded by (111) planes [22,23]. The TEM images agree with the UV-visible SPR for the generation of the SNPs.…”

“…During the progress of the reaction, the UV-vis spectra show the appearance of two new peaks near 370 and 470-495 nm. The observed peaks are contrary to a single SPR band in the range of 390-450 nm for spherical silver nanoparticles [13,14] and attributed to reduction in symmetry with the formation of hexagonal or triangular SNPs [1,22]. The TEM images showed that the light brown SNPs solution contains a non-aggregated triangle, truncated triangle and hexagonal shape nanoplates (Fig.…”

“…This is a strong evidence of the preferential growth of the particles along (111) directions. Thus, the diffraction intensity of the (111) plane should be greatly enhanced compared to that of other planes [22,23]. FTIR spectroscopy analysis was performed to identify the possible biomolecules responsible for the reduction and capping on nanoparticle surfaces.…”

“…The nucleation and growth process of SNPs can be attributed to the transformation of small Ag nanoparticles into other particle geometries via the Ostwald ripening process (Fig. 6b, step II and III) [1,22]. Hence, it is rational to conclude that − COOH group of RPE biomolecules function as a stabilizer ligand on SNPs to prevent them from aggregating.…”

Light emitting diode irradiation induced shape conversion of DNA-capped silver nanoparticles and their antioxidant and antibacterial activities

“…In contrast, the reaction exposing to the blue LED appeared in green colour with the presence of two SPR peaks at 412 and 595 nm, suggesting the formation of non-spherical AgNPs [31]. Although the right-shifted SPR peak may indicate the formation of larger sizes of AgNPs [30], the newly emerged SPR peak in the range of 495-630 nm aside from the original SPR peak at 416-418 nm is the characteristics of non-spherical AgNPs [32]. The control reactions with no light exposure and no DNA remained in yellow colour with the SPR peaks at 420 and 413 nm, respectively, indicating the presence of spherical Figure 1.…”