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Koshki MS, Zirak M, Kazemi M, Alehdaghi H, Baghayeri M, Nodehi M, Rabiee N. Molybdenum-doped BiVO 4 thin films: Facile preparation via hot-spin coating method and the relationship between surface statistical parameters and photoelectrochemical activity. Chemosphere 2024; 346:140579. [PMID: 38303391 DOI: 10.1016/j.chemosphere.2023.140579] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2023] [Revised: 10/13/2023] [Accepted: 10/26/2023] [Indexed: 02/03/2024]
Abstract
Molybdenum-doped BiVO4 thin films were uniformly coated on indium-doped tin oxide (ITO) substrates via a facile modified hot spin coating (HSC) technique. The prepared layers were used as photoanode in a photoelectrochemical (PEC) cell. Different percentage of Mo dopant was examined to maximize the photo-current density (J) of the layers. The highest J value (872 ± 8 μA/cm2) was obtained by 5 atomic% of Mo doping. After that, the surface topographies of these samples were changed by varying the initial precursor concentration from 27 to 80 mM. The relation between surface topographies and the PEC activity of Mo-doped BiVO4 thin films was investigated from microscopic point of view by calculating the surface roughness exponent of α, and a mechanism for the PEC activity of Mo-doped BiVO4 photoanodes was proposed accordingly. The sample with a small roughness exponent provided a surface with jagged microscopic fluctuations which may trap the air molecules between the electrolyte and sample surface, hindering the fine atomic interaction for photo-generated electron-hole transition. Therefore, the layer with the highest roughness exponent (2α = 0.48 ± 0.03), which means the smoother microscopic surface and better interfacial contact with the electrolyte, exhibited the best PEC activity.
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Affiliation(s)
- Mina-Sadat Koshki
- Department of Chemistry, Faculty of Science, Hakim Sabzevari University, P. O. Box 397, Sabzevar, Iran
| | - Mohammad Zirak
- Department of Physics, Faculty of Science, Hakim Sabzevari University, P. O. Box 397, Sabzevar, Iran.
| | - Maziyar Kazemi
- Department of Physics, Faculty of Science, Hakim Sabzevari University, P. O. Box 397, Sabzevar, Iran
| | - Hassan Alehdaghi
- Department of Physics, Faculty of Science, Hakim Sabzevari University, P. O. Box 397, Sabzevar, Iran
| | - Mehdi Baghayeri
- Department of Chemistry, Faculty of Science, Hakim Sabzevari University, P. O. Box 397, Sabzevar, Iran; Department of Natural Sciences, Lebanese American University, Beirut, Lebanon
| | - Marzieh Nodehi
- Department of Chemistry, Faculty of Science, Hakim Sabzevari University, P. O. Box 397, Sabzevar, Iran
| | - Navid Rabiee
- School of Engineering, Macquarie University, Sydney, NSW, 2109, Australia.
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Farahmandzadeh F, Molaei M, Alehdaghi H. Application of CdTe/ZnS Core/Shell Quantum Dots as on Fluorescence Sensor for Detection of Gamma Rays. J Fluoresc 2023; 33:2361-2367. [PMID: 37071231 DOI: 10.1007/s10895-023-03242-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Accepted: 04/05/2023] [Indexed: 04/19/2023]
Abstract
Gamma rays are a type of ionizing radiation that are extremely hazardous and dangerous for humans and the environment. The fluorescence method is a simple, useful, and fast method for the detection of gamma rays. In this research, CdTe/ZnS core/shell quantum dots were used as on fluorescence sensor for the detection of gamma rays. CdTe/ZnS core/shell QDs were prepared via a simple and rapid photochemical method. The shell thickness and concentration of CdTe/ZnS core/shell quantum dots were studied as two important factors in the optical behavior of CdTe/ZnS quantum dots. The obtained results showed that the PL intensity of CdTe/ZnS QDs after gamma irradiation was increased and also a slight redshift in the PL spectrum was observed. X-ray diffractions (XRD) and Raman analyses were used to study the effect of gamma irradiation on the structural properties of CdTe/ZnS QDs. The obtained results showed that gamma irradiation couldn't damage the crystalline structure of CdTe/ZnS core/shell QDs.
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Affiliation(s)
- Farzad Farahmandzadeh
- Department of Physics, Faculty of Science, Vali-E-Asr University of Rafsanjan, Rafsanjan, Iran
| | - Mehdi Molaei
- Department of Physics, Faculty of Science, Vali-E-Asr University of Rafsanjan, Rafsanjan, Iran.
| | - Hassan Alehdaghi
- Department of Physics, Faculty of Science, Hakim Sabzevari University, Sabzevar, Iran
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Dehghan S, Molaei M, Alehdaghi H, Karimipour M. High luminescence of CdTe/CdSe/CdS core/shell/shell QDs: synthesis via a simple photochemical approach and gamma dosimetry application. J COORD CHEM 2022. [DOI: 10.1080/00958972.2022.2067988] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Sima Dehghan
- Department of Physics, Faculty of Science, Vali-e-Asr University, Rafsanjan, Iran
| | - Mehdi Molaei
- Department of Physics, Faculty of Science, Vali-e-Asr University, Rafsanjan, Iran
| | - Hassan Alehdaghi
- Department of Physics, Faculty of Science, Hakim Sabzevari University, Sabzevar, Iran
| | - Masoud Karimipour
- Department of Physics, Faculty of Science, Vali-e-Asr University, Rafsanjan, Iran
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Farahmandzadeh F, Molaei M, Alehdaghi H, Karimipour M, Shamsi A. Effect of concentration and shell thickness on the optical behavior of aqueous CdTe/ZnSe core/shell quantum dots (QDs) exposed to ionizing radiation. LUMINESCENCE 2022; 37:431-439. [PMID: 34994062 DOI: 10.1002/bio.4189] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2021] [Revised: 12/17/2021] [Accepted: 12/26/2021] [Indexed: 12/13/2022]
Abstract
In this work CdTe/ZnSe core/shell quantum dots (QDs) were synthesized via a simple, rapid and room temperature photochemical approach. Optical properties of aqueous prepared CdTe/ZnSe QDs were studied systematically under gamma irradiation with doses range of 0 Gy to 20 kGy. The obtained results showed a regular red shift behavior versus gamma irradiation dose, in PL peak and absorption edge of the CdTe/ZnSe QDs. Structural properties of CdTe/ZnSe QDs before and after gamma irradiation were characteristic by means of XRD, Raman and FT-IR analyses. The obtained results showed that the crystalline structure of CdTe/ZnSe core/shell QDs wasn't changed after gamma irradiation. Concentration and shell thickness as two important factors on the sensitivity of CdTe/ZnSe QDs in front of gamma irradiation have been investigated. Based on this study, CdTe/ZnSe QDs suggested as a good candidate for gamma dosimeter.
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Affiliation(s)
| | - Mehdi Molaei
- Department of Physics, Faculty of Science, Vali-e-Asr University, Rafsanjan, Iran
| | - Hassan Alehdaghi
- Department of physics, Faculty of Science, Hakim Sabzevari university, Sabzevar, Iran
| | - Masoud Karimipour
- Department of Physics, Faculty of Science, Vali-e-Asr University, Rafsanjan, Iran
| | - Alireza Shamsi
- Department of Physics, Faculty of Science, Vali-e-Asr University, Rafsanjan, Iran
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Alehdaghi H, Assar E, Azadegan B, Baedi J, Mowlavi A. Investigation of optical and structural properties of aqueous CdS quantum dots under gamma irradiation. Radiat Phys Chem Oxf Engl 1993 2020. [DOI: 10.1016/j.radphyschem.2019.108476] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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