Morphological tuning of Eu2O2S nanoparticles, manifestation of peroxidase-like activity and glucose assay use. (17th December 2015)

• Record Type: Journal Article
• Authors: Ghosh, Abhisek Brata; Saha, Namrata; Sarkar, Arpita; Dutta, Amit Kumar; Biswas, Papu; Nag, Kamalaksha; Adhikary, Bibhutosh
• Is Part Of: New journal of chemistry. Volume 40:Number 2(2016:Feb.)
• Page Start: 1595
• Page End: 1604
• Publication Date: 2015-12-17
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/c5nj02705e
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : We present a single source precursor driven synthesis of Eu2 O2 S with variable shapes, which effectively mimic peroxidase activity, and were successfully employed to selectively detect and determine glucose. Abstract : Eu2 O2 S nanoparticles have been synthesized by solvothermal decomposition of the precursor complex [NHEt3 ] + [Eu(acda)4 ] −, wherein acda − is the anion of 2-aminocyclopentene-1-dithiocarboxylic acid. Oleylamine alone or in combination with surface active agents, such as trioctylphosphine or oleic acid, at 280 °C produced nanoparticles of three different morphologies, namely, ultrathin nanoplates, nanospheres and short rods. The optical band energy of the nanoparticles has been found to be 4.57(8) eV. Eu2 O2 S particles exhibit strong photoluminescence at room temperature with a quantum yield of about 4% upon excitation at 285 nm. All three forms display peroxidase-like activity towards the oxidation of 3, 3′, 5, 5′-tetramethylbenzidine in the presence of H2 O2 and follow a Michaelis–Menten enzymatic pathway. The mechanistic investigation reveals that the Eu 3+ /Eu 2+ redox couple plays a crucial role behind this catalytic process. Catalytic efficiency of the nanoparticles decreases in the order plates > spheres > rod-like particles. Based on peroxidase activity, selective detection and estimation of glucose in the presence of related carbohydrates has been carried out.