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Anisotropic growth of gold clusters to gold nanocubes under UV irradiation

机译：紫外线辐射下金团簇向金纳米立方体的各向异性生长

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A chiral reagent, 2-naphthol, has been introduced under alkaline solution as a reductant for HAuCl_4 in CTAB micelle to produce exclusively cubic gold nanoparticles under UV photoactivation. Prolonged irradiation helped the digestion of the primarily evolved spherical particles into smaller gold nanocubes, which then act as tiny cubic seeds, leading to the formation of larger nanocubes. The smaller cubes take the assistance of CTAB under alkaline condition to serve as the seed in directing the transformation of all the spherical colloids into cubic shapes under continuous irradiation via Ostwald ripening. The shape transformation of the nanoparticles has been monitored by repetitive TEM imaging and absorption spectral analysis. The FTIR analysis proves that the gold nanocubes are capped by CTAB. The XRD pattern authenticates the formation of the fcc gold nanocubes. GCMS studies in turn confirmed the presence of hydroxylation of 2-naphthol in the course of the reaction, leaving exclusively cubic gold nanoparticles at the final stage of the photoactivation reaction.
机译：已经在碱性溶液中引入了手性试剂2-萘酚作为CTAB胶束中HAuCl_4的还原剂，以在紫外线光活化下仅生成立方金纳米颗粒。长时间的照射有助于将最初演化的球形颗粒消化成较小的金纳米立方体，然后将其用作微小的立方晶种，从而导致形成较大的纳米立方体。较小的立方体在碱性条件下借助CTAB充当种子，指导所有球形胶体在经过奥斯特瓦尔德（Ostwald）熟化的连续辐射下转变为立方体形状。纳米颗粒的形状转变已通过重复的TEM成像和吸收光谱分析进行了监测。 FTIR分析证明金纳米立方体被CTAB覆盖。 XRD图谱证实了fcc金纳米立方体的形成。 GCMS研究进而证实了在反应过程中2-萘酚存在羟基化，仅在光活化反应的最后阶段留下了立方金纳米颗粒。

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