Microbead Silica Decorated with Polyhedral Silver Nanoparticles as a Versatile Component of Sacrificial Gel Films for SERS Applicationsстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 28 декабря 2015 г.
Аннотация: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 aqueuos solutions of diamminesilver (I) hydroxide without addition of reducing agents. The seeding beads initiate growth of polyhedral 20 - 50 nm silver nanopartices 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.