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Highly luminescent and electrically conductive hybrid material. APPLIED NANOSCIENCE 2022. [DOI: 10.1007/s13204-021-01732-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Nitrogen-doped graphene oxide as a catalyst for the oxidation of Rhodamine B by hydrogen peroxide: application to a sensitive fluorometric assay for hydrogen peroxide. Mikrochim Acta 2019; 187:47. [PMID: 31845299 DOI: 10.1007/s00604-019-3994-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2019] [Accepted: 10/31/2019] [Indexed: 10/25/2022]
Abstract
The authors report that nitrogen-doped graphene oxide (NGO) catalyzes the oxidative decomposition of the fluorophore Rhodamine B (RhB) by hydrogen peroxide. The catalytic decomposition of hydrogen peroxide yields free hydroxyl radicals that destroy RhB so that the intensity of the yellow fluorescence is reduced. Nitrogen doping enhances the electronic and optical properties and surface chemical reactivities of GO such as widening of bandgap, increase in conductivity, enhanced quenching and adsorbing capabilities etc. The catalytic properties of NGO are attributed to its large specific surface and high electron affinity of nitrogen atoms. The chemical and structural properties of GO and NGO were characterized by XRD, FTIR, SEM, UV-visible and Raman spectroscopies. The method was optimized by varying the concentration of RhB, nitrogen dopant and hydrogen peroxide. The fluorescent probe, best operated at excitation/emission wavelengths of 554/577 nm, allows hydrogen peroxide to be determined in concentrations as low as 94 pM with a linear range spanning from 1 nM to 1 μM. Graphical abstract Schematic illustration of a fluorescence quenching method for the determination of H2O2. Upon addition of H2O2, nitrogen-doped graphene oxide (NGO) catalyzes the oxidation of Rhodamine B dye due to hydroxyl radical generation, which leads to a sensitive quenchometric methd for H2 O2.
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Chen L, Zhang L, Jiang SL, Zhang Q. Mechanistic Insights into the Fluorescence Quenching of Rhodamine 6G by Graphene Oxide. CHINESE J CHEM PHYS 2018. [DOI: 10.1063/1674-0068/31/cjcp1710196] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Affiliation(s)
- Lu Chen
- Department of Chemical Physics, Hefei National Laboratory for Physical Sciences at the Microscale, Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China
| | - Lei Zhang
- Department of Chemical Physics, Hefei National Laboratory for Physical Sciences at the Microscale, Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China
| | - Shen-long Jiang
- Department of Chemical Physics, Hefei National Laboratory for Physical Sciences at the Microscale, Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China
| | - Qun Zhang
- Department of Chemical Physics, Hefei National Laboratory for Physical Sciences at the Microscale, Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China
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Prakash R, Usha G, Sivaranjana P, Karpagalakshmi K, Piramuthu L, Selvapalam N. Graphene oxide based fluorescence sensor for cucurbit[7]uril. NEW J CHEM 2018. [DOI: 10.1039/c8nj02686f] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Rhodamine B (RhB) anchored reduced graphene oxide (RhBGO) offers a very sensitive and selective sensing potential for cucurbit[7]uril (CB[7]).
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Affiliation(s)
- Ramesh Prakash
- Center for Supramolecular Chemistry and Department of Chemistry
- International Research Center
- Kalasalingam Academy of Research and Education (Kalasalingam University)
- Krishnankoil
- India
| | - Govindaraj Usha
- Center for Supramolecular Chemistry and Department of Chemistry
- International Research Center
- Kalasalingam Academy of Research and Education (Kalasalingam University)
- Krishnankoil
- India
| | - Paramasivan Sivaranjana
- Department of Chemistry
- Kalasalingam Academy of Research and Education (Kalasalingam University)
- India
| | - Karuppasamy Karpagalakshmi
- Center for Supramolecular Chemistry and Department of Chemistry
- International Research Center
- Kalasalingam Academy of Research and Education (Kalasalingam University)
- Krishnankoil
- India
| | - Lakshminarayanan Piramuthu
- Center for Supramolecular Chemistry and Department of Chemistry
- International Research Center
- Kalasalingam Academy of Research and Education (Kalasalingam University)
- Krishnankoil
- India
| | - Narayanan Selvapalam
- Center for Supramolecular Chemistry and Department of Chemistry
- International Research Center
- Kalasalingam Academy of Research and Education (Kalasalingam University)
- Krishnankoil
- India
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Hansda C, Chakraborty U, Hussain SA, Bhattacharjee D, Paul PK. Layer-by-layer films and colloidal dispersions of graphene oxide nanosheets for efficient control of the fluorescence and aggregation properties of the cationic dye acridine orange. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2016; 157:79-87. [PMID: 26722674 DOI: 10.1016/j.saa.2015.12.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2015] [Revised: 10/09/2015] [Accepted: 12/05/2015] [Indexed: 06/05/2023]
Abstract
Chemically derived graphene oxide (GO) nanosheets have received great deal of interest for technological application such as optoelectronic and biosensors. Aqueous dispersions of GO become an efficient template to induce the association of cationic dye namely Acridine Orange (AO). Interactions of AO with colloidal GO was governed by both electrostatic and π-π stacking cooperative interactions. The type of dye aggregations was found to depend on the concentration of GO in the mixed ensemble. Spectroscopic calculations revealed the formation of both H and J-type dimers, but H-type aggregations were predominant. Preparation of layer-by-layer (LbL) electrostatic self-assembled films of AO and GO onto poly (allylamine hydrochloride) (PAH) coated quartz substrate is also reported in this article. UV-Vis absorption, steady state and time resolve fluorescence and Raman spectroscopic techniques have been employed to explore the detail photophysical properties of pure AO, AO/GO mixed solution and AO/GO LbL films. Scanning electron microscopy was also used for visual evidence of the synthesized nanodimensional GO sheets. The fluorescence quenching of AO in the presence of GO in aqueous solution was due to the interfacial photoinduced electron transfer (PET) from photoexcited AO to GO i.e. GO acts as an efficient quenching agent for the fluorescence emission of AO. The quenching is found to be static in nature. Raman spectroscopic results also confirmed the interaction of AO with GO and the electron transfer. The formation of AO/GO complex via very fast excited state electron transfer mechanism may be proposed as to prepare GO-based fluorescence sensor for biomolecular detection without direct labeling the biomolecules by fluorescent probe.
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Affiliation(s)
- Chaitali Hansda
- Department of Physics, Jadavpur University, Jadavpur, Kolkata 700032, India; Department of Physics, The University of Burdwan, Golapbag, Burdwan 713104, India
| | - Utsav Chakraborty
- Department of Physics, Jadavpur University, Jadavpur, Kolkata 700032, India
| | - Syed Arshad Hussain
- Department of Physics, Tripura University, Suryamaninagar, 799022, Tripura West, India
| | | | - Pabitra Kumar Paul
- Department of Physics, Jadavpur University, Jadavpur, Kolkata 700032, India.
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Orejarena Pacheco JC, Lipp A, Nauth AM, Acke F, Dietz JP, Opatz T. A Highly Active System for the Metal-Free Aerobic Photocyanation of Tertiary Amines with Visible Light: Application to the Synthesis of Tetraponerines and Crispine A. Chemistry 2016; 22:5409-15. [PMID: 26929114 DOI: 10.1002/chem.201504845] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2015] [Indexed: 01/12/2023]
Abstract
A highly efficient metal-free catalytic system for the aerobic photocyanation of tertiary amines with visible light is reported. The use of air as terminal oxidant offers an improved safety profile compared with pure oxygen, the used compact fluorescent lamp (CFL) light sources are highly economical, and no halogenated solvents are required. This system not only proves to be effective for a wide variety of trialkylamines, pharmaceuticals, and alkaloids but remarkably also allows the lowest catalyst loading (0.00001 mol% or 0.1 ppm) ever reported for an organic dye. Bruylants reactions and C-alkylation/decyanations were performed on the obtained α-aminonitriles to demonstrate the postfunctionalization of complex molecules. The catalytic system is furthermore applied in the short and effective syntheses of the alkaloids (±)-crispine A and the tetraponerines T7 and T8.
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Affiliation(s)
| | - Alexander Lipp
- Institute of Organic Chemistry, University of Mainz, Duesbergweg 10-14, 55128, Mainz, Germany
| | - Alexander M Nauth
- Institute of Organic Chemistry, University of Mainz, Duesbergweg 10-14, 55128, Mainz, Germany
| | - Fabian Acke
- Institute of Organic Chemistry, University of Mainz, Duesbergweg 10-14, 55128, Mainz, Germany
| | - Jule-Philipp Dietz
- Institute of Organic Chemistry, University of Mainz, Duesbergweg 10-14, 55128, Mainz, Germany
| | - Till Opatz
- Institute of Organic Chemistry, University of Mainz, Duesbergweg 10-14, 55128, Mainz, Germany.
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Bongu SR, Veluthandath AV, Nanda B, Ramaprabhu S, Bisht PB. Control over the charge transfer in dye-nanoparticle decorated graphene. Chem Phys Lett 2016. [DOI: 10.1016/j.cplett.2015.12.023] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Bavali A, Parvin P, Mortazavi SZ, Nourazar SS. Laser induced fluorescence spectroscopy of various carbon nanostructures (GO, G and nanodiamond) in Rd6G solution. BIOMEDICAL OPTICS EXPRESS 2015; 6:1679-1693. [PMID: 26137372 PMCID: PMC4467715 DOI: 10.1364/boe.6.001679] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2014] [Revised: 04/01/2015] [Accepted: 04/01/2015] [Indexed: 05/30/2023]
Abstract
The effect of carbon nanostructures such as graphene (G), graphene oxide (GO) and nanodiamond (ND) on the spectral properties of Rhodamine 6G (Rd6G) emission due to the laser induced fluorescence (LIF) was investigated. It is shown that the addition of carbon nano- structures lead to sensible Red/Blue shifts which depend on the optical properties and surface functionality of nanoparticles. The current theories such as resonance energy transfer (RET), fluorescence quenching and photon propagation in scattering media support the experimental findings. Stern-Volmer curves for dynamic and static quenching of Rd6G molecules embedded with G, GO and nanodiamond are correlated with spectral shifts. Furthermore, time evolution of the spectral shift contributes to determine loading/release rates of fluorescent species with large S-parameter on the given nano-carriers.
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Affiliation(s)
- A. Bavali
- Physics Dept., Amirkabir University of Technology, P.O. Box 15875-4413, Tehran,
Iran
| | - P. Parvin
- Physics Dept., Amirkabir University of Technology, P.O. Box 15875-4413, Tehran,
Iran
| | - S. Z. Mortazavi
- Physics Dept., Faculty of Science, Imam Khomeini International University, P.O. Box 34149-16818 Qazvin,
Iran
| | - S. S. Nourazar
- Mechanical Engineering Dept., Amirkabir University of Technology, P.O. Box 15875-4413, Tehran,
Iran
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Effect of complex formation on nonlinear optical parameters of dye-graphene system. J Photochem Photobiol A Chem 2015. [DOI: 10.1016/j.jphotochem.2014.11.010] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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