Ghimire Govinda, Guo Jing, Halmagian Robert, He Jin
Physics Department, Florida International University, Miami, FL 33199, USA.
The State Key Laboratory of Refractories and Metallurgy, Institute of Advanced Materials and Nanotechnology, Wuhan University of Science and Technology, Wuhan, 430081, China.
Angew Chem Int Ed Engl. 2023 May 8;62(20):e202302215. doi: 10.1002/anie.202302215. Epub 2023 Apr 12.
Plasmonic metal nanostructures are essential for plasmon-mediated chemical reactions (PMCRs) and surface-enhanced Raman spectroscopy (SERS). The nanostructures are commonly made from the coinage metals gold and silver. Copper (Cu) is less used mainly due to the difficulties in fabricating stable nanostructures. However, Cu is an attractive option with its strong plasmonic properties, high catalytic activities, and relatively cheap price. Herein, we fabricated tunable, reliable, and efficient Cu nanoelectrodes (CuNEs). Using time-resolved electrochemical SERS, we have comprehensively studied the reversible chemical transformations between aromatic amine and nitro groups modified on the CuNE surface. Their PMCRs are well-controlled by changing the surface roughness, the oxidation states of Cu, and the applied electrode potential. We thus demonstrate that the Cu nanostructures enable better investigations in the interplays between PMCR, electrochemistry, and Cu catalysis.
等离子体金属纳米结构对于等离子体介导的化学反应（PMCR）和表面增强拉曼光谱（SERS）至关重要。这些纳米结构通常由货币金属金和银制成。铜（Cu）较少使用，主要是因为制造稳定的纳米结构存在困难。然而，Cu因其强大的等离子体特性、高催化活性和相对低廉的价格而成为一个有吸引力的选择。在此，我们制备了可调谐、可靠且高效的铜纳米电极（CuNE）。使用时间分辨电化学SERS，我们全面研究了在CuNE表面修饰的芳香胺和硝基之间的可逆化学转化。通过改变表面粗糙度、Cu的氧化态和施加的电极电位，可以很好地控制它们的PMCR。因此，我们证明了Cu纳米结构能够更好地研究PMCR、电化学和Cu催化之间的相互作用。
