Microbead silica decorated with polyhedral silver nanoparticles as a versatile component of sacrificial gel films for SERS applications
RSC Advances, ISSN: 2046-2069, Vol: 5, Issue: 110, Page: 90335-90342
2015
- 8Citations
- 14Captures
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Article Description
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 SiO 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.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84946133513&origin=inward; http://dx.doi.org/10.1039/c5ra16788d; http://xlink.rsc.org/?DOI=C5RA16788D; http://pubs.rsc.org/en/content/articlepdf/2015/RA/C5RA16788D; https://xlink.rsc.org/?DOI=C5RA16788D; https://dx.doi.org/10.1039/c5ra16788d; https://pubs.rsc.org/en/content/articlelanding/2015/ra/c5ra16788d
Royal Society of Chemistry (RSC)
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