Fabrication of Au nanoparticles on poly(vinylpyrrolidone) nanowires exhibiting reversible frequency change of localized surface plasmon resonance
Fabrication of Au nanoparticles on poly(vinylpyrrolidone) nanowires exhibiting reversible frequency change of localized surface plasmon resonance
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DOI：
10.1063/1.5001553
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发表时间：
2018-01
期刊：
影响因子：
1.6
通讯作者：
S. Tsukuda;S. Seki;Masaaki Omichi;M. Sugimoto;A. Idesaki;T. Sekino;T. Omata
中科院分区：
文献类型：
--
作者：
S. Tsukuda;S. Seki;Masaaki Omichi;M. Sugimoto;A. Idesaki;T. Sekino;T. Omata
通过在含HAuCl 4的MeOH溶液中光还原，在基于聚（乙烯基吡咯烷酮）（PVP）的凝胶纳米线（NW）上形成Au纳米颗粒（NP）。Au纳米粒子的粒径和数密度随着光还原时间的延长而增大。在15分钟的光还原时间，PVP纳米线的表面几乎完全覆盖的Au纳米粒子。基于Au NPs的局域表面等离子体共振（LSPR），杂化材料表现出可见光吸收。在干燥条件下的峰值LSPR吸收波长略有红移的颗粒尺寸和数量密度的增加，由于增加耦合的等离子体带的每个颗粒。在水中，LSPR波长与干燥条件下相比蓝移，这是因为由于PVP凝胶NW的溶胀导致Au NP之间的颗粒间距离增加;这导致颗粒的等离子体激元耦合减少。当混合纳米线交替排列时，吸收峰波长发生可逆移动。
Au nanoparticles (NPs) are formed on gel nanowires (NWs) based on poly(vinylpyrrolidone) (PVP) via photoreduction in a HAuCl4-containing MeOH solution. The particle size and number density of the Au NPs increase with the photoreduction time. At a photoreduction time of 15 min, the surfaces of the PVP NWs are almost completely covered by Au NPs. The hybrid material exhibited visible optical absorption based on the localized surface plasmon resonance (LSPR) of the Au NPs. The peak LSPR absorption wavelength under dry conditions red-shifted slightly as the particle size and number density increased owing to increased coupling of the plasmonic bands of each particle. In water, the LSPR wavelength is blue-shifted compared with under dry conditions because of an increase in the interparticle distance between the Au NPs owing to the swelling of the PVP gel NWs; this causes a decrease of the plasmonic coupling of the particles. The absorption peak wavelength shifts reversibly when the hybrid NWs is alternately ex...