NDLI: Citrate–hydrazine hydrogen-bonding driven single-step synthesis of tunable near-IR plasmonic, anisotropic silver nanocrystals: implications for SERS spectroscopy of inorganic oxoanions

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Pattanayak, Satarupa Swarnkar, Abhishek Bhalerao, Gopal M. Priyam, Amiya
Description	Author Affiliation: Pattanayak S ( Department of Applied Chemistry, Birla Institute of Technology, Mesra, Ranchi-835215, India.)
Abstract	A simplified, single-step aqueous synthesis route to tunable anisotropic silver nanocrystals (NCs) has been developed by tailoring the hydrogen-bonding interactions between a mild stabilizer, sodium citrate, and a mild reductant, hydrazine hydrate. The structure directing ability of the H-bonding interaction was harnessed by keeping a stoichiometric excess of hydrazine under ambient conditions (pH 7, 25 °C). Decreasing the synthesis temperature to 5 °C imparts rigidity to the citrate–hydrazine H-bonding network, and the plasmon peak moves from 500 to 550 nm (using 40 mM hydrazine). On lowering the pH from 7 to 5, the H-bonding is further strengthened due to partial protonation of citrate and the plasmon peak is tuned to 790 nm. Further, we found that, at 5 °C and pH 5, there also exists a sub-stoichiometric regime in which maximum tunability of the plasmon peak (790→1010 nm) is achieved with 1 mM hydrazine. HR-TEM reveals that the near-IR plasmonic NCs are nanopyramids having a pentagonal base with edge length varying from 15 nm to 30 nm. Through second derivative FTIR analysis, a correlation between hydrogen-bonded molecular vibrations and the plasmon tunability has been established. The anisotropic NCs exhibit significant Raman enhancement on the citrate molecules. Further, a solution-phase, non-resonant SERS spectroscopic detection method for an inorganic contaminant of ground water, arsenite, has also been developed.
ISSN	14779226
Issue Number	31
Journal	Dalton Trans.
Volume Number	43
e-ISSN	13645447
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2014-08-21
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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