Formation Mechanisms of Pt and Pt3Gd Nanoparticles under Solvothermal Conditions: An in Situ Total X-ray Scattering Study
Formation Mechanisms of Pt and Pt3Gd Nanoparticles under Solvothermal Conditions: An in Situ Total X-ray Scattering Study
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溶剂热条件下 Pt 和 Pt3Gd 纳米粒子的形成机制：原位全 X 射线散射研究
DOI：
10.1021/acs.jpcc.5b03394
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
B. Iversen
中科院分区：
文献类型：
--
作者：
D. Saha;E. Bøjesen;K. Jensen;A. Dippel;B. Iversen
铂基纳米颗粒作为催化剂发挥着至关重要的作用，溶剂热合成方法由于对纳米颗粒特性如尺寸、结晶度和形态的优异控制而具有吸引力，这些特性强烈影响化学和物理性质。在溶剂热条件下形成纳米颗粒的反应机理的洞察通常仍然难以捉摸。这主要是由于在合成过程中获得纳米尺度上的原子信息存在实验困难。使用原位总X射线散射和对分布函数（PDF）分析的时间分辨率为1秒，我们解开的Pt和Pt3Gd纳米粒子在溶剂热条件下的形成机制。我们证明了八面体Pt4+铂酸前体络合物在两个步骤中被还原。Pt和Pt3Gd的形成都是通过将正方形平面的Pt 2+络合物转化为不饱和的纳米团簇（Pt 0），然后将其从Pt 2+络合物中分离出来。
Platinum-based nanoparticles play a crucial role as catalysts, and solvothermal synthesis methods are attractive due to the excellent control of nanoparticle characteristics such as size, crystallinity, and morphology, which strongly affect the chemical and physical properties. Insight into the reaction mechanism leading to nanoparticle formation under solvothermal conditions generally remains elusive. This is mainly due to the experimental difficulties that lie in obtaining atomistic information on the nanoscale during the progression of the synthesis. Using in situ total X-ray scattering and pair distribution function (PDF) analysis with a time resolution of 1 s, we unravel the formation mechanisms of Pt and Pt3Gd nanoparticles under solvothermal conditions. We demonstrate that an octahedral Pt4+ platinic acid precursor complex is reduced in two steps. Both Pt and Pt3Gd nanocrystal formation proceeds via conversion of a square-planar Pt2+ complex to an unsaturated nanocluster (Pt0), which subsequently g...
产生生长激素的垂体腺瘤术后照射 18 年后肉瘤转化
DOI：
--
发表时间：
2018
期刊：
影响因子：
--
作者：
岡田正康;米岡有一郎;大石誠;藤井幸彦
通讯作者：
藤井幸彦