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Title: Engineering Localized Surface Plasmon Interactions in Gold by Silicon Nanowire for Enhanced Heating and Photocatalysis

The field of plasmonics has attracted considerable attention in recent years because of potential applications in various fields such as nanophotonics, photovoltaics, energy conversion, catalysis, and therapeutics. It is becoming increasing clear that intrinsic high losses associated with plasmons can be utilized to create new device concepts to harvest the generated heat. It is therefore important to design cavities, which can harvest optical excitations efficiently to generate heat. In this paper, we report a highly engineered nanowire cavity, which utilizes a high dielectric silicon core with a thin plasmonic film (Au) to create an effective metallic cavity to strongly confine light, which when coupled with localized surface plasmons in the nanoparticles of the thin metal film produces exceptionally high temperatures upon laser irradiation. Raman spectroscopy of the silicon core enables precise measurements of the cavity temperature, which can reach values as high as 1000 K. The same Si–Au cavity with enhanced plasmonic activity when coupled with TiO 2 nanorods increases the hydrogen production rate by ~40% compared to similar Au–TiO 2 system without Si core, in ethanol photoreforming reactions. Finally, these highly engineered thermoplasmonic devices, which integrate three different cavity concepts (high refractive index core, metallo-dielectric cavity, and localized surfacemore » plasmons) along with the ease of fabrication demonstrate a possible pathway for designing optimized plasmonic devices with applications in energy conversion and catalysis.« less
Authors:
 [1] ;  [1] ;  [2] ;  [1] ;  [3] ;  [4] ; ORCiD logo [1]
  1. Univ. of Pennsylvania, Philadelphia, PA (United States). Dept. of Materials Science and Engineering
  2. Univ. of Pennsylvania, Philadelphia, PA (United States). Dept. of Chemistry
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Univ. of Pennsylvania, Philadelphia, PA (United States). Dept. of Materials Science and Engineering. Dept. of Chemistry
Publication Date:
Report Number(s):
LA-UR-17-21823
Journal ID: ISSN 1530-6984
Grant/Contract Number:
AC52-06NA25396; AC04-94AL85000
Type:
Accepted Manuscript
Journal Name:
Nano Letters
Additional Journal Information:
Journal Volume: 17; Journal Issue: 3; Journal ID: ISSN 1530-6984
Publisher:
American Chemical Society
Research Org:
Univ. of Pennsylvania, Philadelphia, PA (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Univ. of Pennsylvania (United States)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; cavity heating; Localized surface plasmons; metallo-dielectric cavity; nanowire; photoreforming; Raman spectroscopy; silicon; thermoplasmonics
OSTI Identifier:
1374330