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Lee HK, Talib ZA, Mamat Mat Nazira MS, Wang E, Lim HN, Mahdi MA, Ng EK, Yusoff NM, Al-Jumaili BE, Liew JYC. Effect of Sodium Hydroxide Concentration in Synthesizing Zinc Selenide/Graphene Oxide Composite via Microwave-Assisted Hydrothermal Method. MATERIALS (BASEL, SWITZERLAND) 2019; 12:E2295. [PMID: 31323741 PMCID: PMC6678425 DOI: 10.3390/ma12142295] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/27/2019] [Revised: 06/28/2019] [Accepted: 07/01/2019] [Indexed: 11/17/2022]
Abstract
The effect of NaOH solution on the formation of nanoparticles has been the subject of ongoing debate in selenium-based material research. In this project, the robust correlation between the mechanistic growth of zinc selenide/graphene oxide (ZnSe/GO) composite and the concentration of NaOH are elucidated. The ZnSe/GO composite was synthesized via microwave-assisted hydrothermal method and the concentrations of NaOH are controlled at 2 M, 3 M, 4 M, 5 M and 6 M. The XRD spectra show that the crystal phases of the samples exhibited a 100% purity of ZnSe when the concentration of sodium hydroxide (NaOH) was set at 4 M. The further increase of NaOH concentration leads to the formation of impurities. This result reflects the essential role of hydroxyl ions in modifying the purity state of ZnSe/GO composite. The optical band gap energy of ZnSe/GO composite also decreased from 2.68 eV to 2.64 eV when the concentration of NaOH increased from 2 M to 4 M. Therefore, it can be concluded that the optimum concentration of NaOH used in synthesizing ZnSe/GO composite is 4 M. This project provides an alternative green method in the formation of a high purity ZnSe/GO composite.
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Affiliation(s)
- Han Kee Lee
- Department of Physics, Faculty of Science, Universiti Putra Malaysia, Serdang 43400 UPM, Selangor, Malaysia
| | - Zainal Abidin Talib
- Department of Physics, Faculty of Science, Universiti Putra Malaysia, Serdang 43400 UPM, Selangor, Malaysia
| | | | - EnZe Wang
- Institute of Advanced Technology, Universiti Putra Malaysia, Serdang 43400 UPM, Selangor, Malaysia
| | - Hong Ngee Lim
- Institute of Advanced Technology, Universiti Putra Malaysia, Serdang 43400 UPM, Selangor, Malaysia
- Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, Serdang 43400 UPM, Selangor, Malaysia
| | - Mohd Adzir Mahdi
- Wireless and Photonics Network Research Centre, Faculty of Engineering, University Putra Malaysia, Serdang 43400 UPM, Selangor, Malaysia
| | - Eng Khoon Ng
- Wireless and Photonics Network Research Centre, Faculty of Engineering, University Putra Malaysia, Serdang 43400 UPM, Selangor, Malaysia
| | - Norita Mohd Yusoff
- Wireless and Photonics Network Research Centre, Faculty of Engineering, University Putra Malaysia, Serdang 43400 UPM, Selangor, Malaysia
| | - Batool Eneaze Al-Jumaili
- College of Applied Science, Department of Medical Physics, University of Fallujah, Fallujah 31002, Iraq
| | - Josephine Ying Chyi Liew
- Department of Physics, Faculty of Science, Universiti Putra Malaysia, Serdang 43400 UPM, Selangor, Malaysia.
- Institute of Advanced Technology, Universiti Putra Malaysia, Serdang 43400 UPM, Selangor, Malaysia.
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Takeda H, Sakoda K. Rigorous analysis of the dispersion relation of polaritonic channel waveguides. OPTICS EXPRESS 2017; 25:9986-9998. [PMID: 28468377 DOI: 10.1364/oe.25.009986] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We formulated an efficient numerical method for the dispersion relation of polaritonic channel waveguides and applied it to ZnO (wurzite) and ZnSe (zinc-blende) waveguides. The dispersion relation obtained by our calculations is distinct from that of bulk crystals. We found that important contributions to light propagation were made by two modes in the frequency range below the transverse exciton frequency, which was confirmed by comparing the group index obtained by our calculation with Fabry-Perot interference experiments. The numerical error of our method was estimated to be less than 1 % by comparing it with an analytical solution for a model structure. Our calculations predict an extremely small bending loss, which was estimated from the spatial decay rate of evanescent waves outside of the waveguide.
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Lee YS, Bu HB, Taniguchi T, Takagi T, Sobue S, Yamada H, Iwaki T, Kim D. Hydrothermal Synthesis of NAC-capped II–VI Semiconductor ZnSe Quantum Dots in Acidic Condition. CHEM LETT 2016. [DOI: 10.1246/cl.160431] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Chen ML, Oh WC. Synthesis and highly visible-induced photocatalytic activity of CNT-CdSe composite for methylene blue solution. NANOSCALE RESEARCH LETTERS 2011; 6:398. [PMID: 21711924 PMCID: PMC3211492 DOI: 10.1186/1556-276x-6-398] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2011] [Accepted: 05/26/2011] [Indexed: 05/29/2023]
Abstract
Carbon nanotube-cadmium selenide (CNT-CdSe) composite was synthesized by a facile hydrothermal method derived from multi-walled carbon nanotubes as a stating material. The as-prepared products were characterized by X-ray diffraction, scanning electron microscopy with energy dispersive X-ray analysis, transmission electron microscopy (TEM), and UV-vis diffuse reflectance spectrophotometer. The as-synthesized CNT-CdSe composite efficiently catalyzed the photodegradation of methylene blue in aqueous solutions under visible-light irradiation, exhibiting higher photocatalytic activity.
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Affiliation(s)
- Ming-Liang Chen
- Department of Advanced Materials Science & Engineering, Hanseo University, Seosan-si, Chungnam-do, 356-706, Korea
| | - Won-Chun Oh
- Department of Advanced Materials Science & Engineering, Hanseo University, Seosan-si, Chungnam-do, 356-706, Korea
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Aboulaich A, Geszke M, Balan L, Ghanbaja J, Medjahdi G, Schneider R. Water-based route to colloidal Mn-doped ZnSe and core/shell ZnSe/ZnS quantum dots. Inorg Chem 2010; 49:10940-8. [PMID: 21049903 DOI: 10.1021/ic101302q] [Citation(s) in RCA: 97] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Relatively monodisperse and highly luminescent Mn(2+)-doped zinc blende ZnSe nanocrystals were synthesized in aqueous solution at 100 °C using the nucleation-doping strategy. The effects of the experimental conditions and of the ligand on the synthesis of nanocrystals were investigated systematically. It was found that there were significant effects of molar ratio of precursors and heating time on the optical properties of ZnSe:Mn nanocrystals. Using 3-mercaptopropionic acid as capping ligand afforded 3.1 nm wide ZnSe:Mn quantum dots (QDs) with very low surface defect density and which exhibited the Mn(2+)-related orange luminescence. The post-preparative introduction of a ZnS shell at the surface of the Mn(2+)-doped ZnSe QDs improved their photoluminescence properties, resulting in stronger emission. A 2.5-fold increase in photoluminescence quantum yield (from 3.5 to 9%) and of Mn(2+) ion emission lifetime (from 0.62 to 1.39 ms) have been observed after surface passivation. The size and the structure of these QDs were also corroborated by using transmission electron microscopy, energy dispersive spectroscopy, and X-ray powder diffraction.
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Affiliation(s)
- Abdelhay Aboulaich
- Laboratoire Réactions et Génie des Procédés (LRGP), UPR 3349, Nancy-University, CNRS, 1 rue Grandville, 54001 Nancy Cedex, France
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Ma XD, Qian XF, Yin J, Xi HA, Zhu ZK. Preparation and characterization of polyvinyl alcohol-capped CdSe nanoparticles at room temperature. J Colloid Interface Sci 2008; 252:77-81. [PMID: 16290764 DOI: 10.1006/jcis.2002.8377] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2001] [Accepted: 03/23/2002] [Indexed: 11/22/2022]
Abstract
Polyvinyl alcohol (PVA)-capped CdSe nanoparticles were successfully prepared by a one-step solution growth technique at room temperature and ambient pressure. X-ray diffraction, transmission electron microscopy, infrared spectra, and X-ray photoelectron spectra were used to characterize the final product. The as-prepared CdSe nanocrystals were well dispersed and uniform in shape and the diameter of the particles was confined within 8 nm. Ultraviolet-visible absorption spectra were used to study the confined growth process of PVA-capped CdSe nanoparticles. Photoluminescence measurement showed the near band-edge luminescence of the final product.
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Affiliation(s)
- Xiao-Dong Ma
- Research Institute of Polymer Materials, School of Chemistry and Chemical Technology, Shanghai Jiao Tong University, Shanghai, 200240, People's Republic of China
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The higher excited electronic states and spin–orbit splitting of the valence band in three-dimensional assemblies of close-packed ZnSe and CdSe quantum dots in thin film form. J SOLID STATE CHEM 2008. [DOI: 10.1016/j.jssc.2008.03.038] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Nguyen VNH, Amal R, Beydoun D. Photodeposition of CdSe using Se-TiO2 suspensions as photocatalysts. J Photochem Photobiol A Chem 2006. [DOI: 10.1016/j.jphotochem.2005.07.012] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Baskoutas S, Poulopoulos P, Karoutsos V, Angelakeris M, Flevaris N. Strong quantum confinement effects in thin zinc selenide films. Chem Phys Lett 2006. [DOI: 10.1016/j.cplett.2005.10.068] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Lee J, Flack F, Samarth N, Collins RW. Composition and temperature dependence of the optical properties of Zn(1-x) Cd(x)Se (0 < or = x < or = 0.34) below the fundamental bandgap. APPLIED OPTICS 1997; 36:5372-5382. [PMID: 18259357 DOI: 10.1364/ao.36.005372] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The II-VI ternary semiconductor alloy system Zn(1-x) Cd(x) Se with 0 < or = x < or = 0.2 has important applications as the active material in blue-green light-emitting diodes and lasers. For the wavelength and temperature ranges over which these devices are designed to operate, a knowledge of the optical properties of the alloys is important. We report the results of spectroscopic ellipsometry measurements of the real part of the dielectric function epsilon1 for Zn-rich Zn(1-x) Cd(x) Se layers deposited epitaxially on (100) GaAs. We derive compact expressions that allow one to calculate accurate epsilon1 spectra from 1.5 eV, the low-energy limit of our ellipsometer, to E0-0.05 eV, where E0 is the fundamental bandgap energy, for any composition and temperature within the ranges 0 < or = x < or = 0.34 and 25 < or = T < 260 degrees C. Furthermore, we expect that the results can also be extrapolated to cover the substrate temperature range typically used for the growth of these films (250-300 degrees C). Hence the results presented here are also useful in future real-time spectroscopic ellipsometry studies of Zn(1-x) Cd(x) Se film growth.
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Affiliation(s)
- J Lee
- Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
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