Abstract
Mesoporous silver nanoparticles were easily synthesized through the bulk reduction of crystalline silver(I) oxide and used for the preparation of highly porous surface-enhanced Raman scattering (SERS)-active substrates. An analogous procedure was successfully performed for the production of mesoporous silver films by chemical reduction of oxidized silver films. The sponge-like silver blocks with high surface area and the in-situ-prepared mesoporous silver films are efficient as both analyte adsorbents and Raman signal enhancement mediators. The efficiency of silver reduction was characterized by X-ray diffraction and X-ray photoelectron spectroscopy. The developed substrates were applied for SERS detection of rhodamine 6G (enhancement factor of about 1–5 × 105) and an anti-ischemic mildronate drug (meldonium; enhancement factor of ≈102) that is known for its ability to increase the endurance performance of athletes.
Highlights
Nowadays one of the largest sectors of the global chemical industry is the production of different mesoporous materials
We demonstrated the detection of an anti-ischemic mildronate drug, which is widely known for its ability to increase the endurance performance of athletes, which resulted in its inclusion to the World Anti-Doping Agency (WADA) prohibited list
An efficient and convenient synthesis method was proposed for mesoporous silver micrometer and submicrometersized particles
Summary
Nowadays one of the largest sectors of the global chemical industry is the production of different mesoporous materials. In the present manuscript we used submicrometer-sized Ag2O cubes as precursors for mesoporous silver structures resulting from diffusion-limited reduction [26,27]. A roughly equimolar ratio of silver and PVP (monomer units) leads to randomly shaped and highly merged oxide particles, while a ten-fold excess of polyol produced well-developed cube-like crystallites with the mean size of 480 ± 70 nm.
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