Selective Detection of H2O2 Using para‐Phenylenediamine Capped Ce3+/Tb3+‐Doped NaYF4 Microrods. Issue 15 (30th September 2016)

• Record Type: Journal Article
• Authors: Meesaragandla, Brahmaiah; Verma, Akash; Bheemireddy, Varun; Mahalingam, Venkataramanan
• Is Part Of: ChemistrySelect. Volume 1:Issue 15(2016)
• Page Start: 4927
• Page End: 4934
• Publication Date: 2016-09-30
• Subjects: Detection -- fluorides -- hydrogen peroxide -- microrods -- para-phenylenediamine; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.201601079
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: In this work, we have shown the use of Ln 3+ ‐doped nanomaterials for the selective detection of H2 O2 upto nM concentration. This is achieved by capping the Ce 3+ /Tb 3+ ‐doped NaYF4 microrods using para‐phenylenediamine (p‐PDA). The microrods show strong green emission upon UV excitation due to strong energy transfer from Ce 3+ to Tb 3+ ions. This strong energy transfer is selectively quenched upon addition of H2 O2 leading to reduction in the green emission intensity. This selective quenching of the green emission is due to oxidation of p‐PDA to Bandrowski's base which has strong absorption band close to 310 nm, which falls in 4 f 5 d emission level of Ce 3+ ions. The proposed mechanism is also supported by TD‐CAM‐DFT calculations performed on p‐PDA and its oxidized product. The reduction in the emission intensity is found to be very selective which is verified by the addition of other analytes (glucose, glutamic acid, uric acid, urea, tryptophan, aspartic acid and some metal ions, Na +, K +, SO4 2+, and Mg 2+ ) which normally co‐exist with H2 O2 in the body. More than 90% of the initial intensity of the Tb 3+ was recovered upon the addition of a NaBH4 solution. The study clearly implies that the resonance energy transfer (RET) using Ln 3+ ‐doped microrods can serve as a tool to selectively detect H2 O2 upto the nanomolar concentration. Abstract : The para‐phenylenediamine capped Ce 3+ /Tb 3+ ‐doped NaYF4 microrods are used for the selective detection of H2 O2 upto nM concentration. The microrods show strong green emission upon UV excitation due to strong energy transfer from Ce 3+ to Tb 3+ ions. This strong energy transfer is selectively quenched upon addition of H2 O2 leading to reduction in the green emission intensity. This selective quenching of the green emission is due to oxidation of p‐PDA to Bandrowski's base which has strong absorption band close to Ce 3+ ions emission.