Plasmon-Induced Electron Transfer between Gold Nanorods and a Carbon Thin Film
Plasmon-Induced Electron Transfer between Gold Nanorods and a Carbon Thin Film
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DOI：
10.1021/acs.jpcc.3c07754
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发表时间：
2023-12
期刊：
影响因子：
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通讯作者：
Tamie Vo;Wei-Shun Chang
中科院分区：
文献类型：
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作者：
Tamie Vo;Wei-Shun Chang
等离子体纳米结构由于其有效的光子吸收和产生热载流子的能力而被证明是新兴的光催化剂。然而，等离子体激元产生的热载流子通过超快弛豫途径衰减，导致寿命短，这阻碍了热载流子用于化学反应的开发。在异质结的混合纳米结构的电荷分离可以抵消超快衰减，延长载流子寿命。在这里，我们制造的混合纳米结构组成的金纳米棒和碳薄膜，并证明这两种材料之间的有效的电荷转移。使用单粒子暗场散射光谱，我们观察到的碳膜上的金纳米棒相比，在玻璃基板上的纵向等离子体的加宽。我们将这种等离子体阻尼归因于从金纳米棒到碳膜的电子转移，并排除了等离子体诱导的共振能量转移的贡献。对于厚度为10和25 nm的碳膜，电子转移效率分别为52.8 ± 4.8和57.4 ± 4.0%。这项工作证明了在金-碳膜界面处的有效电荷分离，这可以延长热载流子的寿命以促进等离子体光催化剂。
Plasmonic nanostructures have been demonstrated as emergent photocatalysts because of their efficient photon absorption and their ability to produce hot carriers. However, the plasmon-generated hot carriers decay through ultrafast relaxation pathways, resulting in a short lifetime that impedes the exploitation of hot carriers for chemical reactions. Charge separation at the heterojunction of the hybrid nanostructures can counteract the ultrafast decay to extend the carrier lifetime. Here, we fabricate hybrid nanostructures composed of gold nanorods and a carbon thin film and demonstrate efficient charge transfer between these two materials. Using single-particle dark-field scattering spectroscopy, we observe a broadening of the longitudinal plasmon for gold nanorods on a carbon film compared to those on a glass substrate. We attribute this plasmon damping to the electron transfer from gold nanorods to the carbon film and exclude the contribution from plasmon-induced resonance energy transfer. The electron transfer efficiencies are calculated as 52.8 ± 4.8 and 57.4 ± 4.0% for carbon films with thicknesses of 10 and 25 nm, respectively. This work demonstrates efficient charge separation at the gold–carbon film interface, which can extend the lifetime of hot carriers to promote plasmonic photocatalysts.