Hollow Gold-Silver Nanoshells Coated with Ultrathin SiO2 Shells for Plasmon-Enhanced Photocatalytic Applications
| Autor: | Pannaree Srinoi, T. Randall Lee, Maria D. Marquez, Tai Chou Lee |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Scanning electron microscope Nanoparticle Sodium silicate 02 engineering and technology 010402 general chemistry 01 natural sciences lcsh:Technology Silver nanoparticle chemistry.chemical_compound General Materials Science Surface plasmon resonance metal nanoparticles lcsh:Microscopy Plasmon lcsh:QC120-168.85 silica shells lcsh:QH201-278.5 lcsh:T 021001 nanoscience & nanotechnology core-shell nanoparticles Nanoshell 0104 chemical sciences Chemical engineering chemistry Transmission electron microscopy lcsh:TA1-2040 nanoparticles lcsh:Descriptive and experimental mechanics lcsh:Electrical engineering. Electronics. Nuclear engineering 0210 nano-technology lcsh:Engineering (General). Civil engineering (General) lcsh:TK1-9971 gold-silver nanoshells |
| Zdroj: | Materials, Vol 13, Iss 4967, p 4967 (2020) Materials Volume 13 Issue 21 |
| ISSN: | 1996-1944 |
| Popis: | This article details the preparation of hollow gold-silver nanoshells (GS-NSs) coated with tunably thin silica shells for use in plasmon-enhanced photocatalytic applications. Hollow GS-NSs were synthesized via the galvanic replacement of silver nanoparticles. The localized surface plasmon resonance (LSPR) peaks of the GS-NSs were tuned over the range of visible light to near-infrared (NIR) wavelengths by adjusting the ratio of silver nanoparticles to gold salt solution to obtain three distinct types of GS-NSs with LSPR peaks centered near 500, 700, and 900 nm. Varying concentrations of (3-aminopropyl)trimethoxysilane and sodium silicate solution afforded silica shell coatings of controllable thicknesses on the GS-NS cores. For each type of GS-NS, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images verified our ability to grow thin silica shells having three different thicknesses of silica shell (~2, ~10, and ~15 nm) on the GS-NS cores. Additionally, energy-dispersive X-ray (EDX) spectra confirmed the successful coating of the GS-NSs with SiO2 shells having controlled thicknesses. Extinction spectra of the as-prepared nanoparticles indicated that the silica shell has a minimal effect on the LSPR peak of the gold-silver nanoshells. |
| Databáze: | OpenAIRE |
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