Microbead silica decorated with polyhedral silver nanoparticles as a versatile component of sacrificial gel films for SERS applications. Issue 110 (22nd October 2015)

• Record Type: Journal Article
• Authors: Sarycheva, Asia S.; Ivanov, Vladimir K.; Baranchikov, Alexander E.; Savilov, Sergey V.; Sidorov, Alexander V.; Goodilin, Eugene A.
• Is Part Of: RSC advances. Volume 5:Issue 110(2015)
• Page Start: 90335
• Page End: 90342
• Publication Date: 2015-10-22
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c5ra16788d
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : A new method of microbead silica preparation with polyhedral 20–50 nm silver nanoparticles encrusting silica surface. Such microengineered building blocks are stored safely in a sacrificial biopolymer (ethylcellulose) film. 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.