Photomodulated Spatially Confined Chemical Reactivity in a Single Silver Nanoprism

被引:35
作者
Bhanushali, Sushrut [1 ]
Mahasivam, Sanje [2 ]
Ramanathan, Rajesh [2 ]
Singh, Mandeep [2 ]
Mayes, Edwin Lawrence Harrop [3 ]
Murdoch, Billy James [3 ]
Bansal, Vipul [2 ]
Sastry, Murali [1 ,4 ]
机构
[1] Monash Univ, Dept Mat Sci & Engn, Clayton, Vic 3800, Australia
[2] RMIT Univ, Sch Sci, NanoBiotechnol Res Lab, Ian Potter NanoBioSensing Facil, Melbourne, Vic 3001, Australia
[3] RMIT Univ, Coll Sci Engn & Hlth, RMIT Microscopy & Microanal Facil, Melbourne, Vic 3001, Australia
[4] IITB Monash Res Acad, Indian Inst Technol Bombay, Mumbai 400076, Maharashtra, India
基金
澳大利亚研究理事会;
关键词
silver nanoprisms; galvanic replacement reaction; plasmons; photomodulation; hot electrons; chemical reactions; SURFACE-PLASMON RESONANCES; GALVANIC REPLACEMENT; OPTICAL-PROPERTIES; TRANSMETALATION REACTION; GOLD NANOPRISMS; HOT CARRIERS; HOLLOW GOLD; NANOPARTICLES; GROWTH; NANOSTRUCTURES;
D O I
10.1021/acsnano.0c00966
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Single-atom and single-particle catalysis is an area of considerable topical interest due to their potential in explaining important fundamental processes and applications across several areas. An interesting avenue in single-particle catalysis is spatial control of chemical reactivity within the particle by employing light as an external stimulus. To demonstrate this concept, we report galvanic replacement reactions (GRRs) as a spatial marker of subparticle chemical reactivity of a silver nanoprism with AuCl4- ions under optical excitation. The location of a GRR within a single Ag nanoprism can be spatially controlled depending on the plasmon mode excited. This leads to chemomorphological transformation of Ag nanoprisms into interesting Ag-Au structures. This spatial biasing effect is attributed to localized hot electron injection from the tips and edges of the silver nanoprisms to the adjacent reactants that correlate with excitation of different surface plasmon modes. The study also employs low-energy-loss EELS mapping to additionally probe the spatially confined redox reaction within a silver nanoprism. The findings presented here allow the visualization of a plasmon-driven subparticle chemical transformation with high resolution. The selective optical excitation of surface plasmon eigenmodes of anisotropic nanoparticles offers opportunities to spatially modulate chemical transformations mediated by hot electron transfer.
引用
收藏
页码:11100 / 11109
页数:10
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