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700 nm逐步红移到1100 nm,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650 nm,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.
Single-crystalline triangular silver nanoplates synthesized by the dual-reduction method were used as template to replace HAuCl4 in a solution phase at room temperature. The in-plane dipolar surface plasmon resonance (SPR) absorption band of the Ag nanoplates locating initially at around 700 nm was gradually redshifted to 1100 nm via a multi-stage replacement manner after 9 stages of replacement, while the morphology of the template was evolved from solid plates to void triangular nanorings. The adding amount of HAuCl4 per stage could influence the average redshift value per stage, thus enabled a fine tuning of the in-plane dipolar band. And that band would slightly blueshift when HAuCl4 added in single stage reaction was below certain amount. When AgNO3 was reduced by ascorbic acid to deposit silver atoms onto surfaces of the nanoplates via a multi-stage reduction manner, the in-plane dipolar band gradually blueshifts to 650 nm after 8 stages of reduction, with the morphology of the template changing from triangle to larger and smoother round plate. These routes realized a facile stepwise tuning of the absorption band of Ag nanostructures within the visible-near-infrared region under mild conditions.
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