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TiN@TiO2 Core–Shell Nanoparticles as Plasmon‐Enhanced Photosensitizers: The Role of Hot Electron Injection
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2020-04-06 , DOI: 10.1002/lpor.201900376 Xiaohui Xu 1 , Aveek Dutta 1 , Jacob Khurgin 2 , Alexander Wei 3 , Vladimir M. Shalaev 1 , Alexandra Boltasseva 1
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2020-04-06 , DOI: 10.1002/lpor.201900376 Xiaohui Xu 1 , Aveek Dutta 1 , Jacob Khurgin 2 , Alexander Wei 3 , Vladimir M. Shalaev 1 , Alexandra Boltasseva 1
Affiliation
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Metal–semiconductor heterostructures have attracted a lot of attention due to their ability to enhance photovoltaic and photocatalytic processes via plasmonic effects. Thus far, most of the proposed heterostructures are designed with noble metals and the potential of alternative plasmonic materials, such as titanium nitride (TiN), is not yet well explored. In this work, TiN@TiO2 core–shell nanoparticles (NPs) are synthesized and proposed as plasmon‐enhanced photosensitizers for efficient singlet oxygen generation, with the focus on the role of hot electron injection. Excitation of dilute TiN@TiO2 NP dispersions by a 700 nm femtosecond‐pulsed laser effectively converts ground‐state oxygen into singlet oxygen (1O2), driven primarily by hot electrons generated during plasmon decay at the TiN–TiO2 interface and injected into the TiO2 layer. Analytical calculations reveal the unique advantages of TiN–TiO2 heterostructures in hot‐electron‐mediated photocatalysis. Considering the chemical inertness and low cost of TiN, TiN@TiO2 NPs hold great potential as plasmonic photosensitizers for photodynamic therapy and other photocatalytic applications at red‐to‐near‐infrared wavelengths.
中文翻译：
TiN @ TiO2核壳纳米粒子作为等离子体增强的光敏剂：热电子注入的作用
金属-半导体异质结构由于能够通过等离激元效应增强光伏和光催化过程而备受关注。迄今为止，大多数提议的异质结构都是用贵金属设计的，尚未很好地探索诸如氮化钛（TiN）之类的替代等离子体材料的潜力。在这项工作中，合成了TiN @ TiO 2核壳纳米粒子（NPs），并提出了作为等离激元增强的光敏剂，用于有效地产生单线态氧，重点是热电子注入的作用。700 nm飞秒脉冲激光激发稀TiN @ TiO 2 NP分散体可有效地将基态氧转化为单线态氧（1 O 2），主要是由在TiN–TiO 2界面的等离激元衰减过程中产生并注入TiO 2层的热电子所驱动。分析计算揭示了TiN–TiO 2异质结构在热电子介导的光催化中的独特优势。考虑到TiN的化学惰性和低成本，TiN @ TiO 2 NP作为等离激元光敏剂在红至近红外波长的光动力疗法和其他光催化应用中具有巨大潜力。
更新日期：2020-04-06
中文翻译：
TiN @ TiO2核壳纳米粒子作为等离子体增强的光敏剂：热电子注入的作用
金属-半导体异质结构由于能够通过等离激元效应增强光伏和光催化过程而备受关注。迄今为止，大多数提议的异质结构都是用贵金属设计的，尚未很好地探索诸如氮化钛（TiN）之类的替代等离子体材料的潜力。在这项工作中，合成了TiN @ TiO 2核壳纳米粒子（NPs），并提出了作为等离激元增强的光敏剂，用于有效地产生单线态氧，重点是热电子注入的作用。700 nm飞秒脉冲激光激发稀TiN @ TiO 2 NP分散体可有效地将基态氧转化为单线态氧（1 O 2），主要是由在TiN–TiO 2界面的等离激元衰减过程中产生并注入TiO 2层的热电子所驱动。分析计算揭示了TiN–TiO 2异质结构在热电子介导的光催化中的独特优势。考虑到TiN的化学惰性和低成本，TiN @ TiO 2 NP作为等离激元光敏剂在红至近红外波长的光动力疗法和其他光催化应用中具有巨大潜力。
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