pH-dependent size distribution of gold nanoparticles investigated by in situ pH-monitoring throughout the synthetic reaction
pH-dependent size distribution of gold nanoparticles investigated by in situ pH-monitoring throughout the synthetic reaction
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DOI：
10.1016/j.cplett.2015.09.027
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发表时间：
2015-10-16
影响因子：
2.8
通讯作者：
Yun, Wan Soo
中科院分区：
文献类型：
--
作者：
Kang, Aeyeon;Park, Dae Keun;Yun, Wan Soo
pH值是决定金纳米颗粒（AuNPs）尺寸分布的关键因素之一，在合成反应期间不能保持恒定值。在这项工作中，AuNPs合成的pH范围为5.5-10.5，并在整个合成过程中原位监测pH。结果发现，柠檬酸盐为基础的金纳米粒子的合成可以分为两个阶段，根据pH值的变化阶段：pH值下降的早期阶段和pH值上升的最终阶段。pH 7.5时的最大粒径分布可以很好地理解这两个阶段的pH变化。(C)2015 Elsevier B. V.版权所有。
The pH, one of the critical factors in determining the size distribution of gold nanoparticles (AuNPs), is not maintained at a constant value during the synthetic reaction. In this work, AuNPs were synthesized in the pH range of 5.5-10.5 and the pH was monitored in situ throughout the whole synthetic process. It was found that the citrate-based AuNP synthesis could be divided into two stages according to phases of pH change: a pH-decreasing early stage and a pH-increasing final stage. The narrowest size distribution at pH 7.5 can be well understood with these two phases of pH change. (C) 2015 Elsevier B.V. All rights reserved.