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Structure dependent luminescence, peroxidase mimetic and hydrogen peroxide sensing of Samarium Doped Cerium phosphate nanorods

Abstract

Rare earth phosphates have been used extensively in luminescent phosphors, bio-imaging, catalysis, sensors. However, there is a need to correlate the structural-chemical changes associated with the stability and performance. In the present work, hydrothermally synthesized CePO4:Smx (x = 0, 5 and 10 mol %) nanorods were annealed at different temperatures to understand the modulations in structure as well as optical and enzyme mimetic properties. As prepared samarium doped cerium phosphate (SCP) nanorods crystallized in a hydrated hexagonal structure transformed to anhydrous hexagonal and monoclinic on annealing at 400 °C and 800 °C, respectively. Though temperature did not affect the rod-like morphology of SCP, the lattice strain changed from compressive to tensile. Monoclinic SCP exhibited excellent emission till 5% Sm3+ doping while quenching effect dominated at 10% Sm3+. Monoclinic SCP samples demonstrated higher peroxidase-like enzymatic activity in comparison to natural enzyme HRP and hexagonal SCP. Mechanism for the enhanced peroxidase-like activity of monoclinic structure was proposed based on the fluorescence property of terephthalic acid and surface peroxo complex using Raman spectroscopy. Fluorimetric detection based on the luminescent quenching effect of monoclinic SCP nanorods treated with different concentration of hydrogen peroxide showed a linear response from 0 to150 μM concentration with a detection limit of 3.17 μM H2O2. Our results demonstrate the importance of structure on enzyme mimetic activity.

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Publication details

The article was received on 21 Jun 2018, accepted on 06 Sep 2018 and first published on 07 Sep 2018


Article type: Paper
DOI: 10.1039/C8TB01643G
Citation: J. Mater. Chem. B, 2018, Accepted Manuscript
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    Structure dependent luminescence, peroxidase mimetic and hydrogen peroxide sensing of Samarium Doped Cerium phosphate nanorods

    V. G, A. I L, A. Pandiyan, W. Ahmed, S. Ryu, S. W. Cha and S. Babu, J. Mater. Chem. B, 2018, Accepted Manuscript , DOI: 10.1039/C8TB01643G

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