论文部分内容阅读
以双还原剂法制备的单晶三角形银纳米盘为模板,在室温溶液相与HAuCl4发生多轮置换反应,反应9轮后纳米盘的面内偶极表面等离子体共振峰从初始的700nm逐步红移到1100nm,形貌从实心盘状逐渐变为空心纳米环。改变每轮加入的HAuCl4的量即可精细调节面内偶极峰的红移步进量。在只进行一轮反应时,若加入的HAuCl4少于一定量,面内偶极峰会发生小幅度的蓝移。在银纳米盘模板溶液中用抗坏血酸还原AgNO3,银原子沉积到纳米盘上使其生长,若采用多轮还原生长的方法,生长8轮后纳米盘的面内偶极峰逐步蓝移至650nm,形貌从三角形盘状逐渐变为更大更圆滑的圆盘状。以上方法实现了在温和反应条件下在可见光至近红外光区方便地逐步调节银纳米结构的吸收峰。
The single-crystal triangular silver nanodisks prepared by the double reductant method were used as templates. After several rounds of displacement reaction between the solution phase and HAuCl4 at room temperature, after 9 rounds of in-plane dipole surface plasmon resonance, Moving to 1100 nm, the morphology gradually changed from a solid disk to a hollow nanorings. Changing the amount of HAuCl4 added in each round finely adjusts the amount of redshift for the in-plane dipole peak. When only one round of reaction is carried out, if HAuCl4 is added in less than a certain amount, a slight blue shift occurs in the in-plane dipole peak. AgNO3 was reduced by ascorbic acid in the silver nanoplate template solution, and silver atoms were deposited on the nanodisk for growth. If multiple rounds of reduction growth were used, the in-plane dipole peak of the nanodisk was gradually blue-shifted to 650 nm after 8 rounds of growth, The morphology gradually changed from a triangular disk to a larger, more rounded disk. The above method enables the gradual adjustment of the absorption peak of silver nanostructures in the visible to near-infrared region under mild reaction conditions.