Single nanoparticle SERS probes of ion intercalation in metal-oxide electrodes.
Single nanoparticle SERS probes of ion intercalation in metal-oxide electrodes.
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DOI：
10.1021/nl403485e
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发表时间：
2014-01
期刊：
影响因子：
10.8
通讯作者：
Li Li-Li;U. Steiner;S. Mahajan
中科院分区：
文献类型：
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作者：
Li Li-Li;U. Steiner;S. Mahajan
探测电极中的离子嵌入过程对于电池、超级电容器和光伏器件非常重要。在这项工作中，我们使用单纳米粒子（NP）探针，看到实时分子变化相关的电化学调制离子嵌入金属氧化物电极。利用单NP探针转换的表面增强拉曼光谱（Sers），我们观察到钒氧化物电极上吸附分子的拉曼频率和光谱强度随电化学电位的变化而变化。电化学惰性分子的Sers中的电位依赖性频移归因于由钒氧化物中的离子嵌入过程引起的化学和结构变化引起的斯塔克效应。我们的研究开辟了一个独特的战略，探索吸附和分子反应途径的离子嵌入材料和半导体界面。
Probing ion-intercalating processes in electrodes is hugely important for batteries, supercapacitors, and photovoltaic devices. In this work we use single-nanoparticle (NP) probes to see real-time molecular changes correlated to electrochemically modulated ion-intercalation in metal-oxide electrodes. Using surface-enhanced Raman spectroscopy (SERS) transduced by single NP probes, we observe that the Raman frequencies and spectral intensities of the adsorbed molecules vary on cycling the electrochemical potential on a vanadium-oxide electrode. The potential-dependent frequency shifts in SERS from an electrochemically inert molecule are attributed to a Stark effect induced by chemical and structural changes as a result of ion-intercalation processes in vanadium oxide. Our study opens up a unique strategy to explore adsorbates and molecular reaction pathways on ion-intercalating materials and semiconducting interfaces.