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Islam SU, Latief U, Ali J, Khan MS. Long wavelength emissive ZnO/CQDs phosphor with high color purity and its application in sensitive detection of cadmium (II). SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2024; 304:123292. [PMID: 37625198 DOI: 10.1016/j.saa.2023.123292] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Revised: 08/07/2023] [Accepted: 08/21/2023] [Indexed: 08/27/2023]
Abstract
Production of color-tunable emission via simple method for upcoming displays and lighting technologies, and their exceptional luminescence provide considerable potential in sensing application. As environmental pollution and diseases brought by cadmium have always been global issues, therefore, it is imperative to develop an inexpensive, quick, easy, and selective approach for detecting trace cadmium. Herein, we describe the preperation of ZnO/carbon quantum dots (ZnO/CQDs) nanocomposite that emits strongly in the yellow-orange zone with the chromaticity coordinates (0.51, 0.47) and a high color purity (CP) value of 94.3%. The as-produced ZnO/CQDs are used as a fluorescence sensor for Cd2+ via quenching mechanism due to competitive coordination between ZnO/CQDs and Cd2+ with the limit of detection (LOD) of 0.14 μM. Additionally, the suggested method can successfully detect Cd2+ in water samples, demonstrating the feasibility and potential uses of the sensing platform. This study may pave the way for the development of environmentally safe, high-performing, and inexpensive color-tunable phosphor for white LEDs and sensing applications.
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Affiliation(s)
- Shafi Ul Islam
- Department of Physics, Jamia Millia Islamia, New Delhi 110025, India
| | - Urosa Latief
- Department of Physics, Jamia Millia Islamia, New Delhi 110025, India
| | - Javid Ali
- Department of Physics, Jamia Millia Islamia, New Delhi 110025, India
| | - Mohd Shahid Khan
- Department of Physics, Jamia Millia Islamia, New Delhi 110025, India.
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Ternary metal oxide nanocomposite for room temperature H2S and SO2 gas removal in wet conditions. Sci Rep 2022; 12:15387. [PMID: 36100623 PMCID: PMC9470665 DOI: 10.1038/s41598-022-19800-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Accepted: 09/05/2022] [Indexed: 11/17/2022] Open
Abstract
A ternary Mn–Zn–Fe oxide nanocomposite was fabricated by a one-step coprecipitation method for the remotion of H2S and SO2 gases at room temperature. The nanocomposite has ZnO, MnO2, and ferrites with a surface area of 21.03 m2 g−1. The adsorbent was effective in mineralizing acidic sulfurous gases better in wet conditions. The material exhibited a maximum H2S and SO2 removal capacity of 1.31 and 0.49 mmol g−1, respectively, in the optimized experimental conditions. The spectroscopic analyses confirmed the formation of sulfide, sulfur, and sulfite as the mineralized products of H2S. Additionally, the nanocomposite could convert SO2 to sulfate as the sole oxidation by-product. The oxidation of these toxic gases was driven by the dissolution and dissociation of gas molecules in surface adsorbed water, followed by the redox behaviour of transition metal ions in the presence of molecular oxygen and water. Thus, the study presented a potential nanocomposite adsorbent for deep desulfurization applications.
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Imam NG, Harfouche M, Azab AA, Solyman S. Coupling between γ-irradiation and synchrotron-radiation-based XAFS techniques for studying Mn-doped ZnO nanoparticles. JOURNAL OF SYNCHROTRON RADIATION 2022; 29:1187-1197. [PMID: 36073877 PMCID: PMC9455205 DOI: 10.1107/s1600577522006439] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/05/2022] [Accepted: 06/21/2022] [Indexed: 06/15/2023]
Abstract
γ-Irradiation and synchrotron-radiation-based X-ray absorption fine-structure (XAFS) spectroscopy have been used to induce structure disorder through the interaction of γ-rays (200 kGy) with fabricated Mn-doped ZnO nanoparticles (NPs) and then to examine thoroughly the resultant structural change. The extracted electronic/fine XAFS structural parameters reflect a compositional and γ-irradiation co-dependence. The average crystal structure of samples prepared by the sol-gel method was investigated by X-ray diffraction (XRD). A detailed structural XRD data analysis was carried out by applying a Rietveld refinement using the MAUD program. XAFS spectra were collected at the Zn K-edge (9659 eV) in transmission mode and at the Mn K-edge (6539 eV) in fluorescence mode. Direct evidence of the solubility of Mn ions in the ZnO structure was demonstrated by fitting the extended-XAFS (EXAFS) signal. Near-edge XAFS (XANES) analysis provided the oxidation states of Zn and Mn ions through fingerprint XANES spectra of the sample along with those of standard compounds. Linear combination fitting showed that the most fit chemical forms of Zn and Mn in the samples are ZnO and MnO, respectively. The oxidation states of both Zn and Mn XAFS absorbers were confirmed from pre-edge fitting. The results of the magnetic measurements were explained in light of the average and electronic/local structural information obtained from XRD, XANES and EXAFS techniques. The magnetic properties of the samples translate into an induced change in the average crystal and electronic/local structures upon Mn concentration change and γ-irradiation. XRD confirmed the successful preparation of hexagonal Mn-doped ZnO NPs with a crystallite size in the range 33-41 nm. Both XRD and EXAFS analysis detected a minor amount of Mn3O4 as a secondary phase. XANES and EXAFS provided information exploring the outstanding potential of the utilized protocol for detecting precisely the presence of the secondary phase of Mn3O4, which changes with Mn content (x). Mean-square relative displacement (σ2) values extracted from the EXAFS fitting were found to grow for Zn-Zn/Mn paths demonstrating the substitution of Mn/Zn into Zn crystal sites. The EXAFS analysis explains the reasons behind the enhancement in the magnetic properties and shows that the Mn doping content at x = 0.05 produces the most local atomic disorder in ZnO NPs. There is a strong harmony among the XRD, XANES, EXAFS and magnetization behavior of the Mn-doped ZnO NPs. Maximum magnetization was acquired at an Mn content of 0.05. γ-Ray-irradiated Zn1-xMnxO NPs are recommended as optimized candidates for showing the diversity of the applications.
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Affiliation(s)
- N. G. Imam
- Experimental Nuclear Physics Department (Solid State Laboratory), Nuclear Research Center (NRC), Egyptian Atomic Energy Authority (EAEA), Cairo 13759, Egypt
| | - Messaoud Harfouche
- Synchrotron-Light for Experimental and Scientific Applications in the Middle East (SESAME), PO Box 7, Allan 19252, Jordan
| | - A. A. Azab
- Solid State Physics Department, Physics Research Institute, National Research Centre, 33 El Bohouth Street, Dokki, 12622 Giza, Egypt
| | - S. Solyman
- Physics Department, Faculty of Science, Zagazig University, Zagazig, Egypt
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Mahmoud A, Echabaane M, Omri K, Boudon J, Saviot L, Millot N, Chaabane RB. Cu-Doped ZnO Nanoparticles for Non-Enzymatic Glucose Sensing. Molecules 2021; 26:929. [PMID: 33578737 PMCID: PMC7916517 DOI: 10.3390/molecules26040929] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2020] [Revised: 02/04/2021] [Accepted: 02/05/2021] [Indexed: 11/16/2022] Open
Abstract
Copper-doped zinc oxide nanoparticles (NPs) CuxZn1-xO (x = 0, 0.01, 0.02, 0.03, and 0.04) were synthesized via a sol-gel process and used as an active electrode material to fabricate a non-enzymatic electrochemical sensor for the detection of glucose. Their structure, composition, and chemical properties were characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier-transform infrared (FTIR) and Raman spectroscopies, and zeta potential measurements. The electrochemical characterization of the sensors was studied using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and differential pulse voltammetry (DPV). Cu doping was shown to improve the electrocatalytic activity for the oxidation of glucose, which resulted from the accelerated electron transfer and greatly improved electrochemical conductivity. The experimental conditions for the detection of glucose were optimized: a linear dependence between the glucose concentration and current intensity was established in the range from 1 nM to 100 μM with a limit of detection of 0.7 nM. The proposed sensor exhibited high selectivity for glucose in the presence of various interfering species. The developed sensor was also successfully tested for the detection of glucose in human serum samples.
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Affiliation(s)
- Amira Mahmoud
- Laboratory Interfaces and Advanced Materials (LIMA), Faculty of Science of Monastir, University of Monastir, 5019 Monastir, Tunisia; (A.M.); (R.B.C.)
- Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB), UMR 6303 CNRS, Université Bourgogne Franche-Comté, 9 av. A. Savary, BP 47870, 21078 Dijon, France; (J.B.); (L.S.)
| | - Mosaab Echabaane
- NANOMISENE Lab., LR16CRMN01, Centre for Research on Microelectronics and Nanotechnology CRMN of Technopark of Sousse, B.P. 334, Sahloul, 4034 Sousse, Tunisia;
| | - Karim Omri
- Laboratory of Physics of Materials and Nanomaterials Applied at Environment (LaPhyMNE), Faculty of Sciences of Gabes, University of Gabes, 6029 Gabes, Tunisia;
| | - Julien Boudon
- Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB), UMR 6303 CNRS, Université Bourgogne Franche-Comté, 9 av. A. Savary, BP 47870, 21078 Dijon, France; (J.B.); (L.S.)
| | - Lucien Saviot
- Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB), UMR 6303 CNRS, Université Bourgogne Franche-Comté, 9 av. A. Savary, BP 47870, 21078 Dijon, France; (J.B.); (L.S.)
| | - Nadine Millot
- Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB), UMR 6303 CNRS, Université Bourgogne Franche-Comté, 9 av. A. Savary, BP 47870, 21078 Dijon, France; (J.B.); (L.S.)
| | - Rafik Ben Chaabane
- Laboratory Interfaces and Advanced Materials (LIMA), Faculty of Science of Monastir, University of Monastir, 5019 Monastir, Tunisia; (A.M.); (R.B.C.)
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Kuz’micheva G, Kaurova I. Peculiar Structural Effects in Pure and Doped Functional Single Crystals of Complex Compositions. Molecules 2020; 25:molecules25102451. [PMID: 32466174 PMCID: PMC7287726 DOI: 10.3390/molecules25102451] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Revised: 05/18/2020] [Accepted: 05/19/2020] [Indexed: 11/16/2022] Open
Abstract
Results of a detailed structural characterization of nominally pure and doped single crystals of scheelite, eulytin, and perovskite families obtained by melt methods were considered and analyzed. The influence of growth and post-growth annealing conditions on actual compositions of crystals is shown. The reasons for the coloration of the crystals are explained. A change in crystal symmetry due to crystal–chemical and growth reasons is considered. The use of structural analysis and X-ray absorption spectroscopy is substantiated to reveal the role of activator ions in the formation of statistical and local structures, respectively. A relationship between the distribution of activator ions over crystallographic sites and photoluminescent parameters of materials is established, which allows selecting optimal systems for the application. The combined results of studying single-crystal compounds of other classes (huntite, sillenite, whitlockite, garnet, tetragonal bronzes) allow formulating and summarizing structural effects that appeared in the systems and caused by various factors and, in many cases, due to the local environment of cations. A principal difference in the structural behavior of solid solutions and doped compounds is shown. The methodology developed for single-crystal samples of complex compositions can be recommended for the systematic structural studies of functional materials of different compositions.
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Kuz'micheva GM, Ivleva LI, Kaurova IA, Khramov EV, Dunaeva EE, Svetogorov RD, Rybakov VB. Local structural features and composition of the Bi 4Ge 3O 12:Dy 3+ crystals: effect of doping concentration. CrystEngComm 2020. [DOI: 10.1039/d0ce00729c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Dy3+-doped Bi4Ge3O12 crystals possess different actual compositions and structural behavior of Dy3+ and Bi3+ ions depending on the initial Dy2O3 content.
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Affiliation(s)
| | - Liudmila I. Ivleva
- Prokhorov General Physics Institute, Russian Academy of Sciences
- Moscow 119991
- Russia
| | | | | | - Elizaveta E. Dunaeva
- Prokhorov General Physics Institute, Russian Academy of Sciences
- Moscow 119991
- Russia
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Montero-Muñoz M, Ramos-Ibarra JE, Rodríguez-Páez JE, Marques GE, Teodoro MD, Coaquira JAH. Growth and formation mechanism of shape-selective preparation of ZnO structures: correlation of structural, vibrational and optical properties. Phys Chem Chem Phys 2020; 22:7329-7339. [DOI: 10.1039/c9cp06744b] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
A shape-selective preparation method was used to obtain highly crystalline rod-, needle-, nut-, and doughnut-like ZnO morphologies with distinct particle sizes and surface areas.
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Affiliation(s)
- M. Montero-Muñoz
- Institute of Physics
- University of Brasília
- 70910-900 Brasília-DF
- Brazil
| | - J. E. Ramos-Ibarra
- Institute of Physics
- University of Brasília
- 70910-900 Brasília-DF
- Brazil
- University Center Estácio Brasília
| | | | - G. E. Marques
- Department of Physics
- Federal University of São Carlos
- 13565-905 São Carlos-SP
- Brazil
| | - M. D. Teodoro
- Department of Physics
- Federal University of São Carlos
- 13565-905 São Carlos-SP
- Brazil
| | - J. A. H. Coaquira
- Institute of Physics
- University of Brasília
- 70910-900 Brasília-DF
- Brazil
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Mrudula MS, Tiwari N, Jha SN, Bhattacharyya D, Nair MRG. Structural studies on transition metal ion complexes of polyethylene oxide-natural rubber block copolymers. JOURNAL OF POLYMER RESEARCH 2019. [DOI: 10.1007/s10965-019-1837-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Tiwari N, Kumar S, Kamal C, Chakrabarti A, Prajapat CL, Mishra PK, Mondal P, Jha SN, Bhattacharyya D. Structural Investigations of (Ni,Cu) Co-Doped ZnO Nanocrystals by X-ray Absorption Spectroscopy. ChemistrySelect 2018. [DOI: 10.1002/slct.201800310] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Nidhi Tiwari
- Atomic & Molecular Physics Division; Bhabha Atomic Research Centre; Mumbai - 400 085 India
- HomiBhabha National Institute, Anushaktinagar; Mumbai - 400096 India
| | - Shiv Kumar
- Hiroshima Synchrotron Radiation Center; Hiroshima University, Kagamiyama 2-313; Higashi-Hiroshima 739-0046 Japan
| | - Chinnathambi Kamal
- Theory and Simulations Lab, HRDS; Raja Ramanna Centre for Advanced Technology; Indore - 452013 India
| | - Aparna Chakrabarti
- Theory and Simulations Lab, HRDS; Raja Ramanna Centre for Advanced Technology; Indore - 452013 India
| | - Champa Lal Prajapat
- Technical Physics Division; Bhabha Atomic Research Centre; Mumbai - 400 085 India
| | - P. K. Mishra
- Technical Physics Division; Bhabha Atomic Research Centre; Mumbai - 400 085 India
| | - Pushpen Mondal
- Indus Synchrotrons Utilization Section; Raja Ramanna Centre for Advanced Technology; Indore - 452 013 India
| | - Sambhu Nath Jha
- Atomic & Molecular Physics Division; Bhabha Atomic Research Centre; Mumbai - 400 085 India
| | - Dibyendu Bhattacharyya
- Atomic & Molecular Physics Division; Bhabha Atomic Research Centre; Mumbai - 400 085 India
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