Effect of additives on the formation of bismuth nanoparticles by polyol process
Effect of additives on the formation of bismuth nanoparticles by polyol process
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DOI：
10.2109/jcersj2.122.917
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发表时间：
2014-10
影响因子：
1.1
通讯作者：
N. Kitamura;N. Hirao;Kohki Takahashi;Hiroaki Uchiyama;H. Kozuka
中科院分区：
文献类型：
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作者：
N. Kitamura;N. Hirao;Kohki Takahashi;Hiroaki Uchiyama;H. Kozuka
研究了多元醇法制备铋纳米粒子过程中添加剂对其粒径和形貌的影响。在聚乙烯吡咯烷酮（PVP）和三氯化铁存在下，将溶于乙二醇中的双酚A在高温下还原。PVP的单独加入主要形成球形粒子。随着PVP用量的增加，微球粒径从400 nm减小到200 nm。添加较大的重均分子量（Mw）的PVP的球的大小略有下降。另一方面，通过氯化铁与PVP的共添加，以超过70%的高数目比获得六边形或矩形板状颗粒。随着PVP用量的增加，片状颗粒的尺寸和比例略有增加。随着PVP分子量的增加，粒径也随之增大，当加入分子量较大的PVP（Mw ≥ 1，300，000）时，可得到大于1 μ m的方形片状颗粒。适当的PVP含量和尺寸往往会完全降低颗粒的生长速度并抑制彼此聚结，而三价铁离子通过金属铋的交替再氧化抑制了颗粒向c轴的生长速度。
Formation of bismuth nano-particles by polyol process have been studied in terms of the effect of additives on its size and shape. Bismuth trichloride solved in ethylene glycol was reduced at high temperature with the existence of poly(vinylpyrrolidone) (PVP) and ferric chloride. Spherical particles were mostly formed with the solitary addition of PVP. Sphere size was decreased from 400 to 200nm with increasing amount of the PVP. Addition of larger weight-average molecular weight ( M w ) of the PVP decreased the sphere size slightly. On the other hand, hexagonal or rectangular plate-like particles were obtained at a high number ratio over 70 % by the co-addition of ferric chloride with the PVP. Plate size and the fraction of plate-like particles tended to increase slightly with the increase of amount of the PVP. The plate size also increased with increase of molecular weight of the PVP and square plate-like particles larger than 1 micrometer were obtained with the addition of the large molecular size of PVP ( M w ³ 1,300,000). Adequate amount and size of PVP tended to decrease totally the growth speed of particles and to suppress coalescence with each other, and ferric ions suppressed the growth speed toward the c -axis by alternative re-oxidization of bismuth metal.