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Rohilla S, Gupta A, Kumar V, Kumari S, Petru M, Amor N, Noman MT, Dalal J. Excellent UV-Light Triggered Photocatalytic Performance of ZnO.SiO 2 Nanocomposite for Water Pollutant Compound Methyl Orange Dye. NANOMATERIALS (BASEL, SWITZERLAND) 2021; 11:2548. [PMID: 34684989 PMCID: PMC8541141 DOI: 10.3390/nano11102548] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/06/2021] [Revised: 09/21/2021] [Accepted: 09/23/2021] [Indexed: 11/17/2022]
Abstract
The photocatalytic activity of eco-friendly zinc oxide doped silica nanocomposites, synthesized via a co-precipitation method followed by heat-treatment at 300, 600, and 900 °C is investigated. The samples have been characterized by employing X-ray diffraction method, and further analyzed using the Rietveld Refinement method. The samples show a space group P63mc with hexagonal structure. The prepared composites are tested for their photocatalytic activities for the degradation of methyl orange-based water pollutants under ultra-violet (UV) irradiation using a 125 W mercury lamp. A systematic analysis of parameters such as the irradiation time, pH value, annealing temperatures, and the concentration of sodium hydroxide impacting the degradation of the methyl orange (MO) is carried out using UV-visible spectroscopy. The ZnO.SiO2 nanocomposite annealed at 300 °C at a pH value of seven shows a maximum photo-degradation ability (~98.1%) towards methyl orange, while the photo-degradation ability of ZnO.SiO2 nanocomposites decreases with annealing temperature (i.e., for 600 and 900 °C) due to the aspect ratio. Moreover, it is seen that with increment in the concentration of the NaOH (i.e., from 1 to 3 g), the photo-degradation of the dye component is enhanced from 20.9 to 53.8%, whereas a reverse trend of degradation ability is observed for higher concentrations.
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Affiliation(s)
- Sunil Rohilla
- Department of Physics, Chaudhary Ranbir Singh University, Jind 126102, India; (S.R.); (S.K.)
| | - Ankita Gupta
- Department of Physics, Adarsh Mahila Mahavidyalaya, Bhiwani 127021, India;
| | - Vibhor Kumar
- Department of Electrical Engineering, Northern Illinois University, Dekalb, IL 60115, USA;
| | - Suman Kumari
- Department of Physics, Chaudhary Ranbir Singh University, Jind 126102, India; (S.R.); (S.K.)
| | - Michal Petru
- Department of Machinery Construction, Institute for Nanomaterials, Advanced Technologies and Innovation, Technical University of Liberec, Studentská 1402/2, 46117 Liberec, Czech Republic; (M.P.); (N.A.)
| | - Nesrine Amor
- Department of Machinery Construction, Institute for Nanomaterials, Advanced Technologies and Innovation, Technical University of Liberec, Studentská 1402/2, 46117 Liberec, Czech Republic; (M.P.); (N.A.)
| | - Muhammad Tayyab Noman
- Department of Machinery Construction, Institute for Nanomaterials, Advanced Technologies and Innovation, Technical University of Liberec, Studentská 1402/2, 46117 Liberec, Czech Republic; (M.P.); (N.A.)
| | - Jasvir Dalal
- Department of Physics, Chaudhary Ranbir Singh University, Jind 126102, India; (S.R.); (S.K.)
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Synthesis, crystal structure and physico-chemical investigations of a new lyonsite molybdate Na0.24Ti1.44(MoO4)3. J SOLID STATE CHEM 2021. [DOI: 10.1016/j.jssc.2021.122221] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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Gomes EO, Gracia L, Santiago AAG, Tranquilin RL, Motta FV, Amoresi RAC, Longo E, Bomio MRD, Andres J. Structure, electronic properties, morphology evolution, and photocatalytic activity in PbMoO 4 and Pb 1-2xCa xSr xMoO 4 ( x = 0.1, 0.2, 0.3, 0.4 and 0.5) solid solutions. Phys Chem Chem Phys 2020; 22:25876-25891. [PMID: 33156308 DOI: 10.1039/d0cp04596a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this work PbMoO4 and Pb1-2xCaxSrxMoO4 (x = 0.1, 0.2, 0.3, 0.4 and 0.5) solid solutions have been successfully prepared, for the first time, by a simple co-precipitation method and the as-synthesized samples were subjected to a water-based reflux treatment. Structural characterization of these samples was performed using X-ray diffraction with Rietveld refinement analysis and Raman spectroscopy. Their optical properties were investigated by UV-Vis absorption spectroscopy and PL emissions, and the photocatalytic activity of the as-synthesized samples for the degradation process of Rhodamine B has been demonstrated. The surface structure and morphologies were characterized by field emission scanning electron microscopy. To complement and rationalize the experimental results, the geometry, electronic structures, and morphologies of as-synthesized samples were characterized by first-principles quantum-mechanical calculations at the density functional theory level. By using Wulff construction, based on the values of the surface energies for the (001), (100), (110), (111), (011) and (112) surfaces, a complete map of the available morphologies for PbMoO4 was obtained and a good agreement between the experimental and theoretical predicted morphologies was found. The structural and electronic changes induced by the substitution of Pb by Ca and Sr allow us to find a relationship among morphology, the electron-transfer process at the exposed surfaces, optical properties, and photocatalytic activity. We believe that our results offer new insights regarding the local coordination of superficial Pb/Ca/Sr and Mo cations (i.e., clusters) on each exposed surface of the corresponding morphology, which dictate the photocatalytic activities of the as-synthesized samples, a field that has so far remained unexplored. The present study, which combines multiple experimental methods and first-principles calculations, provides a deep understanding of the local structures, bonding, morphologies, band gaps, and electronic and optical properties, and opens the door to exploit the electrical, optical and photocatalytic activity of this very promising family of materials.
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Affiliation(s)
- E O Gomes
- Department of Analytical and Physical Chemistry, Universitat Jaume I, 12071 Castelló, Spain.
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Kissinger RM, Chong S, Riley BJ, Crum JV. Synthesis and crystal structure of a mixed alkaline-earth powellite, Ca 0.84Sr 0.16MoO 4. Acta Crystallogr E Crystallogr Commun 2020; 76:121-124. [PMID: 32071732 PMCID: PMC7001819 DOI: 10.1107/s2056989019017092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Accepted: 12/20/2019] [Indexed: 11/10/2022]
Abstract
A mixed alkaline-earth powellite, Ca0.84Sr0.16MoO4 (calcium strontium molybdate), was synthesized by a flux method and its crystal structure was solved using single-crystal X-ray diffraction (SC-XRD) data. The compound crystallized in the I41/a space group as with a typical CaMoO4 powellite, but with larger unit-cell parameters and unit-cell volume as a result of the partial incorporation of larger Sr cations into the Ca sites within the crystal. The unit cell and volume were well fitted with the trendline calculated from literature values, and the powder X-ray diffraction (P-XRD) pattern of the ground crystal is in good agreement with the calculated pattern from the solved structure.
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Affiliation(s)
| | - Saehwa Chong
- Pacific Northwest National Laboratory, Richland, WA 99354, USA
| | - Brian J. Riley
- Pacific Northwest National Laboratory, Richland, WA 99354, USA
| | - Jarrod V. Crum
- Pacific Northwest National Laboratory, Richland, WA 99354, USA
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Jendoubi I, Ptak M, Pikul A, Chmielowiec J, Ciupa A, Mączka M, Zid MF. Synthesis, crystal structure, phonon, magnetic and electrical properties of new molybdate Na2Mn2(MoO4)3. J SOLID STATE CHEM 2019. [DOI: 10.1016/j.jssc.2019.07.028] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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Li K, Deun RV. Low-Temperature Solid-State Synthesis and Upconversion Luminescence Properties in (Na/Li)Bi(MoO 4) 2:Yb 3+,Er 3+ and Color Tuning in (Na/Li)Bi(MoO 4) 2:Yb 3+,Ho 3+,Ce 3+ Phosphors. Inorg Chem 2019; 58:6821-6831. [PMID: 31046263 DOI: 10.1021/acs.inorgchem.9b00280] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In this Article, we reported the synthesis and the upconversion luminescence (UCL) properties of a series of novel (Na/Li)Bi(MoO4)2:Yb3+,Er3+ [(N/L)BMO:Yb3+,Er3+] and (Na/Li)Bi(MoO4)2:Yb3+,Ho3+,Ce3+ [(N/L)BMO:Yb3+,Ho3+,Ce3+] phosphors. X-ray diffraction patterns and Rietveld refinements for several representative samples indicated the pure phase of as-prepared samples. The Yb3+,Er3+ codoped (N/L)BMO presented bright green luminescence under 975 nm laser excitation with UCL spectra showing two main green bands around 529 nm (Er3+, 2H11/2 → 4I15/2) and 551 nm (Er3+, 4S3/2 → 4I15/2), in addition to a very weak one at 655 nm (Er3+, 4F9/2 → 4I15/2). The (N/L)BMO:Yb3+,Ho3+ mainly showed a green band around 544 nm (5S2,5F4 → 5I8) and a red band around 654 nm (5F5 → 5I8) upon 975 nm laser excitation. With increasing Yb3+ concentrations in (N/L)BMO:Yb3+,0.01Ho3+, the red/green ratios decreased monotonously corresponding to the emission color variation from light red to light yellow. Both UCL mechanisms of Yb3+,Er3+ and Yb3+,Ho3+ were determined to be two-phonons absorption processes in (N/L)BMO:Yb3+,Er3+/Ho3+. The Ce3+ ions were introduced into Yb3+,Ho3+ codoped (N/L)BMO to show the color tuning from light yellow to light red originating from the cross relaxation processes of (CR1) Ho3+ (5F4,5S2) + Ce3+ (2F5/2) → Ho3+ (5F5) + Ce3+ (2F7/2) and (CR2) Ho3+(5I6) + Ce3+ (2F5/2) → Ho3+ (5I7) + Ce3+ (2F7/2), which is based on the energy matching of Ce3+2F7/2-2F5/2 level pairs with Ho3+5I6-5I7 and 5F4,5S2-5F5 level pairs and confirmed by the decay times. These results suggest good UCL properties of (N/L)BMO:Yb3+, Er3+ and (N/L)BMO:Yb3+, Ho3+, Ce3+ materials, and color modulation is easily controlled by varying Yb3+ concentration and a cross relaxation process between Ce3+ and Ho3+, which provides efficient methods to regulate the emission color of UCL phosphors.
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Affiliation(s)
- Kai Li
- L3-Luminescent Lanthanide Lab, Department of Chemistry , Ghent University , Krijgslaan 281-S3 , B-9000 Ghent , Belgium
| | - Rik Van Deun
- L3-Luminescent Lanthanide Lab, Department of Chemistry , Ghent University , Krijgslaan 281-S3 , B-9000 Ghent , Belgium
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Kaur P, Singh K. Effect of Ni substitution on the structural and optical properties of SrZr1-xNixO3 (0.05≤x≤0.20) perovskites. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2018.12.051] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Li K, Van Deun R. Mutual energy transfer luminescent properties in novel CsGd(MoO 4) 2:Yb 3+,Er 3+/Ho 3+ phosphors for solid-state lighting and solar cells. Phys Chem Chem Phys 2019; 21:4746-4754. [PMID: 30519698 DOI: 10.1039/c8cp06538a] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this work, we prepared a novel kind of Yb3+,Er3+/Ho3+ co-doped CsGd(MoO4)2 phosphors with a different structure from the reported ALn(MoO4)2 (A = Li, Na or K; Ln = La, Gd or Y) compounds using a high-temperature solid-state reaction method. X-ray diffraction showed that the as-prepared samples had a pure phase. Based on the efficient energy transfer from Yb3+ to Er3+/Ho3+, the up-conversion (UC) luminescence of the optimal CsGd(MoO4)2:0.30Yb3+,0.02Er3+ sample showed intensely green light with dominant emission peaks at 528 and 550 nm corresponding to Er3+ transitions 2H11/2 → 4I15/2 and 4S3/2 → 4I15/2, respectively, as well as a weak emission peak originating from 4F9/2 → 4I15/2 at 671 nm, under 975 nm laser excitation. The CsGd(MoO4)2:Yb3+,Ho3+ samples mainly displayed two emission bands around 540 and 660 nm together with a negligible one at 755 nm, which corresponded to Ho3+ transitions 4F4,5F2 → 5I8, 5F5 → 5I8 and 4F4,5F2 → 5I7, respectively, under 975 nm laser excitation. With increasing Yb3+ concentration in CsGd(MoO4)2:Yb3+,Ho3+ phosphors, the emission color could be tuned from orange red to light yellow due to the large energy gap between levels 4F4,5F2 and 5F5. In addition, the CsGd(MoO4)2:Yb3+,Er3+ showed green light under 376 nm UV irradiation similar to that upon 975 nm laser excitation. However, the emissions for CsGd(MoO4)2:Yb3+,Ho3+ samples under 358 nm UV or 449 nm blue excitation showed dominant emission peaks at 540 nm and weak 660 nm and 752 nm peaks, which were a bit different from those under 975 nm excitation. Interestingly, we observed efficient energy transfer phenomena (possible quantum cutting) from Er3+/Ho3+ to Yb3+ and a Yb3+-O2- charge transfer (CT) transition in the molybdates, which was deduced from the visible and near-infrared emission spectra and the decrease of the Er3+/Ho3+ luminescent lifetimes with increasing Yb3+ concentration in the CsGd(MoO4)2:Yb3+,Er3+/Ho3+ samples. The luminescence properties of these phosphors suggest their potential possibility for applications in solid-state lighting and displays as well as in c-Si solar energy conversion systems.
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Affiliation(s)
- Kai Li
- L3- Luminescent Lanthanide Lab, Department of Chemistry, Ghent University, Krijgslaan 281-S3, B-9000 Ghent, Belgium.
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Damascena Dos Passos RH, Arab M, Pereira de Souza C, Leroux C. Sr 1/2Ce 5/14□ 1/7WO 4: a new modulated ternary scheelite compound. ACTA CRYSTALLOGRAPHICA SECTION B, STRUCTURAL SCIENCE, CRYSTAL ENGINEERING AND MATERIALS 2017; 73:466-473. [PMID: 28572556 DOI: 10.1107/s2052520617002827] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2016] [Accepted: 02/20/2017] [Indexed: 06/07/2023]
Abstract
For the first time, a ternary tetragonal scheelite structure tungstate with strontium and cerium cations, (Sr,Ce)WO4, was synthesized. As much as 35% Ce could be inserted into the structure, leaving 1\over 7 of the (Sr,Ce) cation sites vacant. Partial ordering of Sr and Ce, with atomic displacements, were shown by high-resolution electron microscopy. Two-dimensional incommensurate modulations occur in this material, in small domains 20 nm in size. The band gap of this compound is significantly lower than the band gap of SrWO4 and this was related to the distortions of WO4 and (Sr,Ce)O8 polyhedra. The band gap value of 3.2 eV makes Sr1/2Ce5/14□1/7WO4 a promising candidate for violet luminescence.
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Affiliation(s)
| | - Madjid Arab
- Université de Toulon, CNRS, IM2NP, BP 20132, La Garde CEDEX, F- 83957, France
| | - Carlson Pereira de Souza
- Universidade do Rio Grande de Norte, DEQ/PPGEQ-LMNRC, Campus Universitario, Lagoa Nova 59072-970 Natal, Brazil
| | - Christine Leroux
- Université de Toulon, CNRS, IM2NP, BP 20132, La Garde CEDEX, F- 83957, France
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Dirany N, McRae E, Arab M. Morphological and structural investigation of SrWO4 microcrystals in relationship with the electrical impedance properties. CrystEngComm 2017. [DOI: 10.1039/c7ce00802c] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Synthesis of SrWO4 crystal with spindles and spheres morphologies at ambient temperature. A structuring in tetragonal scheelite favors mixed conduction properties based on order–disorder transition.
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Affiliation(s)
- Nadine Dirany
- Université de Toulon
- IM2NP
- UMR CNRS 7334
- La Garde
- France
| | - Edward McRae
- Institut Jean Lamour
- UMR 7198 CNRS - Faculté des Sciences et Technologies
- Université de Lorraine
- 54506 Vandœuvre-lès-Nancy
- France
| | - Madjid Arab
- Université de Toulon
- IM2NP
- UMR CNRS 7334
- La Garde
- France
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Oliveira MC, Gracia L, Nogueira IC, Gurgel MFC, Mercury JMR, Longo E, Andrés J. On the morphology of BaMoO4crystals: A theoretical and experimental approach. CRYSTAL RESEARCH AND TECHNOLOGY 2016. [DOI: 10.1002/crat.201600227] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Marisa C. Oliveira
- Departament de Química Física i Analítica; Universitat Jaume I; 12071 Castelló de la Plana Spain
- CDMF-UFSCar; Universidade Federal de São Carlos; P.O. Box 676 13565-905 São Carlos SP Brazil
| | - Lourdes Gracia
- Departament de Química Física i Analítica; Universitat Jaume I; 12071 Castelló de la Plana Spain
| | - Içamira C. Nogueira
- Departament de Física; Universidade Federal do Amazonas; 69077-000 Manaus AM Brazil
| | | | | | - Elson Longo
- CDMF-UFSCar; Universidade Federal de São Carlos; P.O. Box 676 13565-905 São Carlos SP Brazil
| | - Juan Andrés
- Departament de Química Física i Analítica; Universitat Jaume I; 12071 Castelló de la Plana Spain
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Silva GS, Gracia L, Fabbro MT, Serejo dos Santos LP, Beltrán-Mir H, Cordoncillo E, Longo E, Andrés J. Theoretical and Experimental Insight on Ag2CrO4 Microcrystals: Synthesis, Characterization, and Photoluminescence Properties. Inorg Chem 2016; 55:8961-70. [DOI: 10.1021/acs.inorgchem.6b01452] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Gabriela S. Silva
- CDMF-UFSCar-Universidade Federal de São Carlos, P.O. Box
676, CEP, 13565-905 São Carlos, São Paulo, Brazil
| | | | - Maria T. Fabbro
- CDMF-UFSCar-Universidade Federal de São Carlos, P.O. Box
676, CEP, 13565-905 São Carlos, São Paulo, Brazil
| | - Luis P. Serejo dos Santos
- CDMF-UFSCar-Universidade Federal de São Carlos, P.O. Box
676, CEP, 13565-905 São Carlos, São Paulo, Brazil
| | | | | | - Elson Longo
- CDMF-UFSCar-Universidade Federal de São Carlos, P.O. Box
676, CEP, 13565-905 São Carlos, São Paulo, Brazil
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Silva MDP, Gonçalves RF, Nogueira IC, Longo VM, Mondoni L, Moron MG, Santana YV, Longo E. Microwave-assisted hydrothermal synthesis of Ag₂(W(1-x)Mox)O₄ heterostructures: Nucleation of Ag, morphology, and photoluminescence properties. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2016; 153:428-435. [PMID: 26361214 DOI: 10.1016/j.saa.2015.08.047] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2015] [Revised: 08/19/2015] [Accepted: 08/30/2015] [Indexed: 06/05/2023]
Abstract
Ag2W(1-x)MoxO4 (x=0.0 and 0.50) powders were synthesized by the co-precipitation (drop-by-drop) method and processed using a microwave-assisted hydrothermal method. We report the real-time in situ formation and growth of Ag filaments on the Ag2W(1-x)MoxO4 crystals using an accelerated electron beam under high vacuum. Various techniques were used to evaluate the influence of the network-former substitution on the structural and optical properties, including photoluminescence (PL) emission, of these materials. X-ray diffraction results confirmed the phases obtained by the synthesis methods. Raman spectroscopy revealed significant changes in local order-disorder as a function of the network-former substitution. Field-emission scanning electron microscopy was used to determine the shape as well as dimensions of the Ag2W(1-x)MoxO4 heterostructures. The PL spectra showed that the PL-emission intensities of Ag2W(1-x)MoxO4 were greater than those of pure Ag2WO4, probably because of the increase of intermediary energy levels within the band gap of the Ag2W(1-x)MoxO4 heterostructures, as evidenced by the decrease in the band-gap values measured by ultraviolet-visible spectroscopy.
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Affiliation(s)
- M D P Silva
- LIEC-Universidade Federal de São Carlos, Rod. Washington Luis, km 235, São Carlos, SP CEP: 13565-905, Brazil
| | - R F Gonçalves
- UNIFESP-Universidade Federal de São Paulo, Rua Prof. Artur Riedel, 275, Diadema, SP CEP 09972-270, Brazil.
| | - I C Nogueira
- IFMA - Instituto Federal do Maranhão, Avenida Getúlio Vargas, no 04 - Monte Castelo, São Luís, MA CEP 65030-005, Brazil
| | - V M Longo
- USP - Universidade de São Paulo, Av. Trabalhador São-Carlense, 400 - Arnold Schimidt, São Carlos, SP CEP 13566-590, Brazil
| | - L Mondoni
- LIEC-Universidade Federal de São Carlos, Rod. Washington Luis, km 235, São Carlos, SP CEP: 13565-905, Brazil
| | - M G Moron
- LIEC-Universidade Federal de São Carlos, Rod. Washington Luis, km 235, São Carlos, SP CEP: 13565-905, Brazil
| | - Y V Santana
- UTFPR-Universidade Tecnológica Federal do Paraná, Av. Alberto Carazzai, 1640, Cornélio Procópio, PR CEP 86300-000, Brazil
| | - E Longo
- LIEC-IQ-Universidade Estadual Paulista, P.O. Box 355, Araraquara, SP CEP 14801-907, Brazil
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Structural, optical, and magnetic properties of NiMoO4 nanorods prepared by microwave sintering. ScientificWorldJournal 2015; 2015:315084. [PMID: 25802887 PMCID: PMC4352760 DOI: 10.1155/2015/315084] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2014] [Accepted: 12/04/2014] [Indexed: 11/23/2022] Open
Abstract
We report on the structural, optical, and magnetic properties of α,β-NiMoO4 nanorods synthesized by annealing the NiMoO4:nH2O precursor at 600°C for 10 minutes in a domestic microwave. The crystalline structure properties of α,β-NiMoO4 were investigated using X-ray diffraction (XRD), Fourier transform infrared (FTIR), and Raman (FT-Raman) spectroscopies. The particle morphologies and size distributions were identified by field emission microscopy (FE-SEM). Experimental data were obtained by magnetization measurements for different applied magnetic fields. Optical properties were analyzed by ultraviolet-visible (UV-vis) and photoluminescence (PL) measurements. Our results revealed that the oxygen atoms occupy different positions and are very disturbed in the lattice and exhibit a particular characteristic related to differences in the length of the chemical bonds (Ni-O and Mo-O) of the cluster structure or defect densities in the crystalline α,β-NiMoO4 nanorods, which are the key to a deeper understanding of the exploitable physical and chemical properties in this study.
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Gonçalves RF, Cavalcante LS, Nogueira IC, Longo E, Godinho MJ, Sczancoski JC, Mastelaro VR, Pinatti IM, Rosa ILV, Marques APA. Rietveld refinement, cluster modelling, growth mechanism and photoluminescence properties of CaWO4:Eu3+microcrystals. CrystEngComm 2015. [DOI: 10.1039/c4ce02279c] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Rabuffetti FA, Culver SP, Suescun L, Brutchey RL. Structural Disorder in AMoO4 (A = Ca, Sr, Ba) Scheelite Nanocrystals. Inorg Chem 2013; 53:1056-61. [DOI: 10.1021/ic4025348] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Federico A. Rabuffetti
- Department
of Chemistry, University of Southern California, Los Angeles, California 90089, United States
| | - Sean P. Culver
- Department
of Chemistry, University of Southern California, Los Angeles, California 90089, United States
| | - Leopoldo Suescun
- Cryssmat−Lab/DETEMA,
Facultad de Química, Universidad de la República, Montevideo, Uruguay
| | - Richard L. Brutchey
- Department
of Chemistry, University of Southern California, Los Angeles, California 90089, United States
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