Anisotropic Origins of Localized Surface Plasmon Resonance in n-Type Anatase TiO2 Nanocrystals

被引：43

作者：

Dahlman, Clayton J. ^{[1
,2
]}

Agrawal, Ankit ^{[1
]}

Staller, Corey M. ^{[1
]}

Adair, Jacob ^{[1
]}

Milliron, Delia J. ^{[1
]}

机构：

[1] Univ Texas Austin, McKetta Dept Chem Engn, 200 E Dean Keeton St, Austin, TX 78712 USA

[2] Univ Calif Santa Barbara, Dept Mat, Engn 2 Bldg 1355, Santa Barbara, CA 93106 USA

来源：

CHEMISTRY OF MATERIALS | 2019年 / 31卷 / 02期

基金：

美国国家科学基金会;

关键词：

DOPED TITANIUM-DIOXIDE; ELECTRICAL-PROPERTIES; SINGLE-CRYSTALS; METAL; NANOPARTICLES; ACCUMULATION; ENERGETICS; SHAPE;

D O I：

10.1021/acs.chemmater.8b04519

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Colloidal nanocrystals of anatase TiO2 exhibit localized surface plasmon resonance (LSPR) in the mid-infrared upon carrier accumulation through synthetic doping or electrochemical reduction. However, the energy and intensity of LSPR in anatase TiO2 nanocrystals is anomalously low compared to those of other transparent conductive oxides with similar bulk conductivity. Here, the electronic origin of LSPR energy and intensity in TiO2 nanocrystals is quantified by measuring infrared transmittance of dilute dispersions of doped nanocrystals and ex situ charged thin films. Optical modeling of infrared spectra reveals that TiO2 nanocrystals can accommodate carrier concentrations exceeding 1.5 x 10(21) cm(-3) upon charging, but the large effective mass along the anatase c-axis is found to diminish the infrared absorption of TiO2 nanocrystals. The respective effects of crystalline anisotropy, synthetic doping, and electrochromic charging on LSPR in TiO2 nanocrystals are investigated, revealing promising new avenues to engineer this material for plasmonic applications.

引用

页码：502 / 511

页数：10

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