Tunable Black Gold: Controlling the Near‐Field Coupling of Immobilized Au Nanoparticles Embedded in Mesoporous Silica Capsules

  title={Tunable Black Gold: Controlling the Near‐Field Coupling of Immobilized Au Nanoparticles Embedded in Mesoporous Silica Capsules},
  author={Mohamed ElKabbash and Ana Sousa-Castillo and Quang Dong Nguyen and Rosal{\'i}a Mari{\~n}o-Fern{\'a}ndez and Nathaniel Hoffman and Miguel A. Correa‐Duarte and Giuseppe Strangi},
  journal={Advanced Optical Materials},
Efficient light‐to‐heat conversion is central for various applications such as thermo‐photovoltaics and solar steam generation. Although metals can strongly absorb light and generate heat, their free electrons shield the electric field before any substantial penetration in the metal. Excitation of surface plasmons can suppress metal reflection and convert it into a black metal, for example, black gold. In this work, mesoporous silica capsules grafted with immobilized Au nanoparticles (NPs) with… 
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