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Nanoscale tracking plasmon-driven photocatalysis in individual nanojunctions by vibrational spectroscopy†
Nanoscale ( IF 5.8 ) Pub Date : 2018-11-02 00:00:00 , DOI: 10.1039/c8nr07447j Kun Zhang 1, 2, 3, 4, 5 , Yujie Liu 1, 2, 3, 4, 5 , Jingjing Zhao 1, 2, 3, 4, 5 , Baohong Liu 1, 2, 3, 4, 5
Nanoscale ( IF 5.8 ) Pub Date : 2018-11-02 00:00:00 , DOI: 10.1039/c8nr07447j Kun Zhang 1, 2, 3, 4, 5 , Yujie Liu 1, 2, 3, 4, 5 , Jingjing Zhao 1, 2, 3, 4, 5 , Baohong Liu 1, 2, 3, 4, 5
Affiliation
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Plasmonic metal nanoparticles (NPs) are promising catalysts in photocatalytic reactions. Understanding the exact role of sites where two particles are approaching (hot spots) is important to achieve higher efficiency of photocatalysis, and promote the development of advanced plasmon-driven photocatalytic systems. Surface-enhanced Raman spectroscopy was employed to probe photocatalytic coupling reactions occurring at individual plasmonic nanojunctions that trap light to nanoscale while serving as nanoreactors. Compared with nanocavities fabricated using the small Ag NPs (70 nm or 82 nm), the 102 nm Ag NP–molecule–Au thin film nanojunction demonstrated enhanced reaction kinetics and catalytic efficiency. On the basis of the experimental results and theoretical modeling, it was concluded that the photochemical reaction dynamics and yields showed direct correlation with the local electric field enhancement at the nanojunction hot spot. The largely enhanced electric field generates increased hot plasmonic electrons, promoting chemical transformations of the adsorbed molecules.
中文翻译：
振动光谱法在单个纳米结中进行纳米级跟踪等离激元驱动的光催化†
等离子体金属纳米颗粒（NPs）在光催化反应中是有希望的催化剂。了解两个粒子接近的位置（热点）的确切作用对于实现更高的光催化效率和促进先进的等离激元驱动的光催化系统的发展很重要。表面增强拉曼光谱用于探测发生在各个等离激元纳米结处的光催化偶联反应，这些等离激元纳米结在充当纳米反应器的同时将光捕获到纳米级。与使用小型Ag NPs（70 nm或82 nm）制造的纳米腔相比，102 nm Ag NP-分子-Au薄膜纳米结表现出增强的反应动力学和催化效率。根据实验结果和理论模型，结论是，光化学反应动力学和产率与纳米结热点处的局部电场增强直接相关。大大增强的电场产生增加的热等离子体电子，从而促进了吸附分子的化学转化。
更新日期：2018-11-02
中文翻译：
振动光谱法在单个纳米结中进行纳米级跟踪等离激元驱动的光催化†
等离子体金属纳米颗粒（NPs）在光催化反应中是有希望的催化剂。了解两个粒子接近的位置（热点）的确切作用对于实现更高的光催化效率和促进先进的等离激元驱动的光催化系统的发展很重要。表面增强拉曼光谱用于探测发生在各个等离激元纳米结处的光催化偶联反应，这些等离激元纳米结在充当纳米反应器的同时将光捕获到纳米级。与使用小型Ag NPs（70 nm或82 nm）制造的纳米腔相比，102 nm Ag NP-分子-Au薄膜纳米结表现出增强的反应动力学和催化效率。根据实验结果和理论模型，结论是，光化学反应动力学和产率与纳米结热点处的局部电场增强直接相关。大大增强的电场产生增加的热等离子体电子，从而促进了吸附分子的化学转化。
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