Indium Tin Oxide Nanoparticles with Compositionally Tunable Surface Plasmon Resonance Frequencies in the Near-IR Region
Indium Tin Oxide Nanoparticles with Compositionally Tunable Surface Plasmon Resonance Frequencies in the Near-IR Region
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DOI：
10.1021/ja9064415
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发表时间：
2009-12-16
影响因子：
15
通讯作者：
Teranishi, Toshiharu
中科院分区：
文献类型：
--
作者：
Kanehara, Masayuki;Koike, Hayato;Teranishi, Toshiharu
本文报道了导电氧化铟锡（ITO）纳米粒子的合成及其表面等离子体共振（SPR）特性。ITO纳米颗粒的SPR峰可以很容易地通过改变Sn掺杂的浓度从3到30摩尔%进行调节。10%Sn掺杂的ITO NP中1618 nm的最短SPR波长可以反映ITO NP中的最高电子载流子密度。金属氧化物的可控SPR频率为无贵金属的SPR应用提供了一种新的途径。与贵金属纳米结构不同，ITO在维斯-近红外区域没有带间和带内跃迁，代表自由电子传导，使我们能够系统地研究传导电子SPR产生的光学效应的起源。
Here we report the synthesis of conducting indium tin oxide (ITO) nanoparticles (NPs) and their surface plasmon resonance (SPR) properties. The SPR peaks of the ITO NPs can be easily tuned by changing the concentration of Sn doping from 3 to 30 mol %. The shortest SPR wavelength of 1618 nm in 10% Sn-doped ITO NPs may reflect the highest electron carrier density in the ITO NPs. The controllable SPR frequencies of metal oxides may offer a novel approach for noble-metal-free SPR applications. Unlike noble-metal nanostructures, ITO has no inter- and intraband transitions in the vis−near-IR region and represents a free-electron conduction, allowing us to systematically study the origin of optical effects arising from the SPRs of conduction electrons.