Using photons to drive chemical reactions has become an increasingly important field of chemistry. Plasmonic materials can provide a means to introduce the energy necessary for nucleation and growth of nanoparticles by efficiently converting visible and infrared light to heat. Moreover, the formation of crystalline nanoparticles has yet to be included in the extensive list of plasmonic photothermal processes. Herein, we establish a light-assisted colloidal synthesis of iron oxide, silver, and palladium nanoparticles by utilizing silica-encapsulated gold bipyramids as plasmonic heat sources. Our work shows that the silica surface chemistry and localized thermal hotspot generated by the plasmonic nanoparticles play crucial roles in the formation mechanism, enabling nucleation and growth at temperatures considerably lower than conventional heating. Additionally, the photothermal method is extended to anisotropic geometries and can be applied to obtain intricate assemblies inaccessible otherwise. This study enables photothermally heated nanoparticle synthesis in solution through the plasmonic effect and demonstrates the potential of this methodology.

利用光子驱动化学反应已成为化学中一个越来越重要的领域。等离子体材料可以通过有效地将可见光和红外光转化为热量，提供一种引入纳米颗粒成核和生长所需能量的方法。此外，晶体纳米颗粒的形成尚未包含在等离子体光热过程的广泛列表中。在此，我们利用二氧化硅封装的金双锥体作为等离子体热源，建立了氧化铁、银和钯纳米颗粒的光辅助胶体合成。我们的工作表明，等离子体纳米颗粒产生的二氧化硅表面化学和局部热热点在形成机制中起着至关重要的作用，能够在远低于传统加热的温度下成核和生长。此外，光热法扩展到各向异性几何结构，可用于获得其他方式无法获得的复杂组件。本研究通过等离激元效应在溶液中实现光热加热纳米颗粒合成，并展示了这种方法的潜力。