Thambi Varsha, Kar Ashish, Ghosh Piue, Paital Diptiranjan, Gautam Abhay Raj Singh, Khatua Saumyakanti
Discipline of Chemistry, Discipline of Electrical Engineering, and Discipline of Material Science and Engineering, Indian Institute of Technology Gandhinagar, Gujarat 382355, India.
ACS Omega. 2019 Aug 16;4(9):13733-13739. doi: 10.1021/acsomega.9b01119. eCollection 2019 Aug 27.
We show that many complex gold nanostructures such as the water chestnut, dog bone, nanobar, and octahedron, which are not easily accessible via a direct seed-growth synthesis approach, can be prepared via overgrowth of the same gold nanorods by varying pH and Ag concentrations in the growth solution. Overgrown nanostructures' shapes were determined by the rate of gold atom deposition, which is faster at higher pH. In the presence of AgNO, codeposition of gold and silver atoms affects the shapes of overgrown nanostructures, particularly at high pH.
我们表明，许多复杂的金纳米结构，如水菱、狗骨、纳米棒和八面体，通过直接种子生长合成方法不易获得，但可以通过在生长溶液中改变pH值和银浓度，在相同的金纳米棒上进行过度生长来制备。过度生长的纳米结构的形状由金原子沉积速率决定，在较高pH值下沉积速率更快。在硝酸银存在下，金和银原子的共沉积会影响过度生长的纳米结构的形状，特别是在高pH值时。
