Metal-doped TiO2 colloidal nanocrystals with broadly tunable plasmon resonance absorption†,Journal of Materials Chemistry C

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Metal-doped TiO2 colloidal nanocrystals with broadly tunable plasmon resonance absorption†
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2018-03-05 00:00:00 , DOI: 10.1039/c8tc00185e
Sheng Cao _{1,

2,

3,

4,

5} , Shengliang Zhang _{1,

2,

3,

4,

5} , Tianran Zhang _{1,

2,

3,

4,

5} , Adrian Fisher _{4,

5,

6,

7,

8} , Jim Yang Lee _{1,

2,

3,

4,

5}

Affiliation

We report here the discovery of metal-doped colloidal TiO₂ nanocrystals (NCs) with broadly tunable plasmon resonance absorption; and their synthesis by a facile and scalable one-pot method. A strong localized surface plasmon resonance (LSPR) absorption peak occurs in the as-synthesized Mo, W, and Nb-doped TiO₂ NCs in the visible, near-infrared (NIR) and mid-infrared regions respectively. Density functional theory calculations indicate a dopant perturbation of the TiO₂ electronic structure and the resultant increase in the electron density at the Fermi level as the likely cause for the strong LSPR absorption. The W-doped TiO₂ NCs are the most versatile since their LSPR absorption in the NIR region can be varied from 980 to 1700 nm by tailoring the dopant concentration and the NC morphology. The method of synthesis can also be scaled up to gram-level production in batch reactors. Tunable LSPR properties and the ease and scalability of synthesis are the strong features of these metal-doped TiO₂ NCs for plasmonic applications.

中文翻译：

金属掺杂的TiO ₂胶体纳米晶体，具有广泛可调的等离子体共振吸收†

我们在这里报告了具有可广泛调谐的等离振子共振吸收的金属掺杂胶体TiO ₂纳米晶体（NCs）的发现。和它们的合成，采用一种简便且可扩展的一锅法。在合成的Mo，W和Nb掺杂的TiO ₂ NC中，分别在可见光，近红外（NIR）和中红外区域中出现一个强烈的局部表面等离子体共振（LSPR）吸收峰。密度泛函理论计算表明，TiO ₂电子结构受到了掺杂物的扰动，从而使费米能级上的电子密度增加，这可能是强LSPR吸收的原因。掺W的TiO ₂NC具有最广泛的用途，因为通过调整掺杂剂浓度和NC形态，它们在NIR区域的LSPR吸收可在980 nm至1700 nm之间变化。合成方法还可以按比例放大到间歇式反应器中的克级生产。可调的LSPR特性以及合成的简便性和可扩展性是这些用于等离子体应用的金属掺杂TiO ₂ NC的强大特性。

更新日期：2018-03-05

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