Abstract
We demonstrate that silver nanoisland film self-assembled on the surface of silver-containing glass in the course of thermal processing in hydrogen is capable to detect 10−7 M concentration of rhodamine 6G in water using surface enhanced Raman spectroscopy (SERS) technique. The film can be multiply restored on the same glass substrate via annealing of the glass in hydrogen. We showed that the film can be self-assembled after as much as ten circles of the substrate cleaning followed by annealing. The proposed technique of the silver nanoisland film formation enables multiple usage of the same glass substrate in SERS experiments.
Highlights
Enormous sensitivity of the surface enhanced Raman spectroscopy (SERS) has attracted a lot of interest to the synthesis of metal island films (MIF) which are widely recognized as key elements of SERS-based sensors [1,2,3,4,5]
The MIF performance in the SERSbased devices is mainly determined by the film morphology which can vary depending on the metal deposition technique as well as post-deposition processing
In order to demonstrate the performance of the created MIF in SERS-based sensors, we showed that it is capable to detect 10−7 M concentration of rhodamine 6G (R6G) deposited on the glass surface
Summary
Enormous sensitivity of the surface enhanced Raman spectroscopy (SERS) has attracted a lot of interest to the synthesis of metal island films (MIF) which are widely recognized as key elements of SERS-based sensors [1,2,3,4,5]. The MIF performance in the SERSbased devices is mainly determined by the film morphology which can vary depending on the metal deposition technique as well as post-deposition processing. We propose a new technique that enables MIF selfassembling on a dielectric substrate enriched with metal. The processing of such substrates in reducing hydrogen atmosphere results in the formation of the metal nanoislands on the substrate surface. This process can be described in terms of reactive diffusion of hydrogen, i.e., in terms of penetration of hydrogen into the substrate and its ionization via reducing metal ions to neutral atoms which are hardly soluble in glass and diffuse towards
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