Issue 110, 2015

Microbead silica decorated with polyhedral silver nanoparticles as a versatile component of sacrificial gel films for SERS applications

Abstract

A new method of microbead silica preparation with superficially built-in 2–3 nm silver seeds is suggested by using a simple reaction of Stoeber SiO2 microspheres with hot aqueous solutions of diamminesilver(I) hydroxide without addition of reducing agents. The seeding beads initiate growth of polyhedral 20–50 nm silver nanoparticles encrusting silica surface after an instant heterogeneous contact with a mixture of silver nitrate and ascorbic acid solutions with concentrations of as low as 1 mM. The unique microstructure results in a pronounced, about 100 nm, red shift of the silver plasmonic band allowing fast and robust tuning of optical properties of the nanocomposites. Such microengineered building blocks are stored safely in a sacrificial biopolymer (ethylcellulose) film as its versatile component to be applied on demand in aqueous environment since polymer swelling absorbs water-soluble analytes and allows for the advanced SERS analysis.

Graphical abstract: Microbead silica decorated with polyhedral silver nanoparticles as a versatile component of sacrificial gel films for SERS applications

Supplementary files

Article information

Article type
Paper
Submitted
19 Aug 2015
Accepted
13 Oct 2015
First published
15 Oct 2015

RSC Adv., 2015,5, 90335-90342

Microbead silica decorated with polyhedral silver nanoparticles as a versatile component of sacrificial gel films for SERS applications

A. S. Sarycheva, V. K. Ivanov, A. E. Baranchikov, S. V. Savilov, A. V. Sidorov and E. A. Goodilin, RSC Adv., 2015, 5, 90335 DOI: 10.1039/C5RA16788D

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