Li Meng, Lu Simin, Liu Debao, Yang Yuntao, Yang Ping
J Nanosci Nanotechnol. 2017 Feb;17(2):1225-232. doi: 10.1166/jnn.2017.12689.
Au nanorods (NRs) with different aspect ratios were synthesized using a silver ion-assisted seed-mediated growth method through controlling the pH of solutions using hydrochloric acid to adjust the pH values of solutions. The Au NRs with longitudinal absorption peak range from 713 nm to 916 nm were fabricated by adjusting the concentrations of silver nitrate, hydrochloric acid, and cetyltrimethy-lammonium bromide in the growth solution. It was found that silver ions and hydrochloricacid were used together to systematically tune the shape and size of Au NRs. H+ ions other than Cl- ions play important role to govern the growth of Au NRs. Au NRs with a large aspect ratio and high yield can be synthesized in a relative high silver nitrate concentration and a low pH value. In optimal conditions, the Au NRs reveal an average diameter of 10 nm and length of 60 nm. Namely, the Au NRs became slender at a lower pH value and higher concentration of the AgNO₃ in the growth solution.
通过使用盐酸控制溶液的pH值，采用银离子辅助种子介导生长法合成了具有不同纵横比的金纳米棒（NRs）。通过调节生长溶液中硝酸银、盐酸和十六烷基三甲基溴化铵的浓度，制备了纵向吸收峰范围为713nm至916nm的金纳米棒。研究发现，银离子和盐酸共同用于系统地调节金纳米棒的形状和尺寸。除Cl-离子外，H+离子在控制金纳米棒的生长中起重要作用。在相对较高的硝酸银浓度和较低的pH值下，可以合成具有大纵横比和高产率的金纳米棒。在最佳条件下，金纳米棒的平均直径为10nm，长度为60nm。也就是说，在较低的pH值和生长溶液中较高浓度的AgNO₃下，金纳米棒变得细长。
