Graduate School of Humanities and Sustainable System Sciences, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan.
Institute for Materials Research, Tohoku University, Katahira 2-1-1 Aoba-ku, Sendai, Miyagi 980-8577, Japan.
Ultrason Sonochem. 2020 Dec;69:105229. doi: 10.1016/j.ultsonch.2020.105229. Epub 2020 Jun 24.
The sonochemical formation of Au seeds and their autocatalytic growth to Au nanorods were investigated in a one-pot as a function of concentration of HAuCl, AgNO, and ascorbic acid (AA). The effects of ultrasonic power and irradiation time were also investigated. In addition, the formation rate of Au nanorods was analyzed by monitoring the extinction at 400 nm by UV-Vis spectroscopy and compared with the growth behavior of Au seeds to nanorods. Most of the reaction conditions affected the yield, size, and shape of Au nanorods formed. It was confirmed that the concentration balance between HAuCl and AA was important to proceed the formation of Au seeds and nanorods effectively. The formation rate became faster with increasing AA concentration and dog-bone shaped nanorods were formed at high AA concentration. It was also confirmed a unique phenomenon that the shape of Au nanorods changed even after the completion of the reduction of Au(I) in the case of short-time ultrasonic irradiation for Au seed formation.
在一锅体系中，研究了超声条件下 Au 纳米种子的形成及其自催化生长为 Au 纳米棒的过程，这一过程与 HAuCl、AgNO 和抗坏血酸（AA）的浓度有关。还考察了超声功率和辐照时间的影响。此外，通过紫外-可见光谱监测 400nm 处的消光来分析 Au 纳米棒的形成速率，并将其与 Au 纳米种子到纳米棒的生长行为进行比较。大多数反应条件都会影响 Au 纳米棒的产率、尺寸和形状。结果证实，HAuCl 和 AA 之间的浓度平衡对于有效进行 Au 纳米种子和纳米棒的形成非常重要。随着 AA 浓度的增加，形成速率变得更快，并且在高 AA 浓度下形成了哑铃状纳米棒。还证实了一个独特的现象，即在 Au 纳米种子形成的短时间超声辐照的情况下，即使 Au（I）的还原完成后，Au 纳米棒的形状也会发生变化。
