缓冲器(光纤)
同质性(统计学)
产量(工程)
化学
纳米颗粒
等离子体子
胶体
化学工程
各向异性
缓冲溶液
纳米技术
材料科学
色谱法
有机化学
光学
光电子学
复合材料
计算机科学
物理
工程类
机器学习
电信
作者
Kavita Chandra,Kayla S. B. Culver,Stephanie E. Werner,Raymond C. Lee,Teri W. Odom
标识
DOI:10.1021/acs.chemmater.6b03242
摘要
This paper describes a set of design parameters for manipulating the branch length, branch direction, and overall size of gold nanostars (AuNS) synthesized by a seedless process. We controlled the structure of AuNS by varying four different synthetic factors: mechanical agitation, type of Good’s buffer, concentration ratio of precursors, and pH of growth solution. We found that stirring the precursors increased the yield of branched particles. Additionally, the AuNS morphology could be controlled by changing the buffer type and concentration ratio of precursors, which tuned the localized plasmon resonances from the visible to the near-infrared. We determined that performing the synthesis at a pH less than the pKa of the buffer was critical for the stability of the AuNS; when the pH was greater than the pKa, the nanoparticles aggregated in solution. We expanded the library of Good’s buffers able to form AuNS and optimized the mechanical and chemical synthesis conditions, which improved the structural homogeneity and overall colloidal stability of the particles.
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