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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
  • 8
    Citations
  • 0
    Usage
  • 14
    Captures
  • 0
    Mentions
  • 2
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    8
    • Citation Indexes
      8
  • Captures
    14
  • Social Media
    2
    • Shares, Likes & Comments
      2
      • Facebook
        2

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.

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