Controlled morphology evolution of branched Au nanostructures and their shape-dependent catalytic and photo-thermal properties
Controlled morphology evolution of branched Au nanostructures and their shape-dependent catalytic and photo-thermal properties
复制标题
DOI：
10.1016/j.colsurfa.2019.123889
复制
发表时间：
2019-12-05
影响因子：
5.2
通讯作者：
Jiang, Lei
中科院分区：
文献类型：
--
作者：
Ma, Hongchao;Liu, Zhibin;Jiang, Lei
以邻苯二酚为还原剂和结构诱导剂，获得了从Au纳米花朵到Au纳米星形再到Au纳米雪花的枝状Au纳米结构的形态演化。用透射电子显微镜和紫外可见光谱对这些支化的AuNSs进行了表征，结果表明，随着邻苯二酚浓度的增加，成核数量的增加和生长速度的加快对支化AuNSs的形态演变起着重要的作用。AuNSS的表面形貌强烈影响其表面等离子体共振(SPR)特性，进而影响其应用。对对硝基苯酚的催化研究表明，尖端尖端(Au纳米薄片)的支化AuNSs具有最高的催化能力，而尖端钝化(Au纳米花)的支化AuNSs的催化能力最低。此外，这些枝状AuNSs的光热治疗(PTT)性质也是形状相关的，高度枝化的Au纳米晶片具有最高的光热转换效率。
Morphology evolution of branched Au nanostructures (AuNSs) from Au nanoflowers to Au nanostars and finally to Au nanosnowflakes was obtained using catechol as both reducing and structure-inducing agent. These branched AuNSs were characterized by TEM and UV-vis spectroscopy and the results reveal that the increasing of number of nuclei and accelerating of growth rate after the increase of catechol concentration play an important role in the morphology evolution of branched AuNSs. The morphology of the AuNSs strongly affects their surface plasmon resonance (SPR) properties, which in turn influences their applications. The catalytic study towards p-nitrophenol suggests that the branched AuNSs with sharp tips (Au nanosnowflakes) possess the highest catalytic capacity while these with blunt tips (Au nanoflowers) have the lowest catalytic capacity. Moreover, the photothermal therapy (PTT) properties of these branched AuNSs are also shape-dependent with the highly branched Au nanosnowflakes hold the highest photothermal conversion efficiency.