Planar SERS nanostructures with stochastic silver ring morphology for biosensor chips

Anna Semenova, Eugene Goodilin, Nadezda Brazhe, Vladimir Ivanov, Alexander Baranchikov, Vasiliy Lebedev, Anastasia Goldt, Olga Sosnovtseva, Sergey Savilov, Alexander Egorov, Alexey Brazhe, Evgeniya Parshina, Oxana Luneva, Georgy Maksimov, Yury Tretyakov

53 Citationer (Scopus)

Abstract

Surface-enhanced Raman spectroscopy (SERS) of living cells has rapidly become a powerful trend in biomedical diagnostics. It is a common belief that highly ordered, artificially engineered substrates are the best future decision in this field. This paper, however, describes an alternative successful solution, a new effortless chemical approach to the design of nanostructured silver and heterometallic continuous coatings with a stochastic "coffee ring" morphology. The coatings are formed from an ultrasonic mist of aqueous diamminesilver hydroxide, free of reducing agents and nonvolatile pollutants, under mild conditions, at about 200-270 °C in air. They consist of 30-100 micrometer wide and 100-400 nm high silver rings composed, in turn, of a porous silver matrix with 10-50 nm silver grains decorating the sponge. This hierarchic structure originates from ultrasonic droplet evaporation, contact-line motion, silver(i) oxide decomposition and evolution of a growing ensemble of silver rings. The fabricated substrates are a remarkable example of a new scalable and low cost material suitable for SERS analyses of living cells. They evoke no hemolysis and reduce erythrocyte lateral mobility due to suitable "coffee ring" sizes and a tight contact with the silver nanostructure. A high SERS enhancement, characteristic of pure silver rings, made it possible to record Raman scattering spectra from submembrane hemoglobin in its natural cellular environment inside single living erythrocytes, thus making the substrates promising for various biosensor chips.

OriginalsprogEngelsk
TidsskriftJournal of Materials Chemistry
Vol/bind22
Udgave nummer47
Sider (fra-til)24530
Antal sider14
ISSN0959-9428
DOI
StatusUdgivet - 21 dec. 2012

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