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Boukhoubza I, Khenfouch M, Achehboune M, Leontie L, Galca AC, Enculescu M, Carlescu A, Guerboub M, Mothudi BM, Jorio A, Zorkani I. Graphene Oxide Concentration Effect on the Optoelectronic Properties of ZnO/GO Nanocomposites. Nanomaterials (Basel) 2020; 10:nano10081532. [PMID: 32764216 PMCID: PMC7466397 DOI: 10.3390/nano10081532] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/15/2020] [Revised: 07/29/2020] [Accepted: 07/31/2020] [Indexed: 11/18/2022]
Abstract
In this work, the effects of graphene oxide (GO) concentrations (1.5 wt.%, 2.5 wt.%, and 5 wt.%) on the structural, morphological, optical, and luminescence properties of zinc oxide nanorods (ZnO NRs)/GO nanocomposites, synthesized by a facile hydrothermal process, were investigated. X-ray diffraction (XRD) patterns of NRs revealed the hexagonal wurtzite structure for all composites with an average coherence length of about 40–60 nm. A scanning electron microscopy (SEM) study confirmed the presence of transparent and wrinkled, dense GO nanosheets among flower-like ZnO nanorods, depending on the GO amounts used in preparation. Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), ultraviolet–visible (UV–Vis) absorption spectroscopy, and photoluminescence (PL) measurements revealed the impact of GO concentration on the optical and luminescence properties of ZnO NRs/GO nanocomposites. The energy band gap of the ZnO nanorods was independent of GO concentration. Photoluminescence spectra of nanocomposites showed a significant decrease in the intensities in the visible light range and red shifted suggesting a charge transfer process. The nanocomposites’ chromaticity coordinates for CIE 1931 color space were estimated to be (0.33, 0.34), close to pure white ones. The obtained results highlight the possibility of using these nanocomposites to achieve good performance and suitability for optoelectronic applications.
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Affiliation(s)
- Issam Boukhoubza
- Group of Nanomaterials and Renewable Energies, Laboratory of Solid State Physics, Faculty of Sciences Dhar el Mahraz, Sidi Mohammed Ben Abdellah University, P.O. Box 1796, Atlas Fez 30 000, Morocco; (I.B.); (M.A.); (M.G.); (A.J.); (I.Z.)
- Africa Graphene Center, Department of Physics, College of Science, Engineering and Technology, Science Campus, University of South Africa, Cnr Christiaan de Wet & Pioneer Avenue, Florida 1709, Johannesburg, South Africa;
| | - Mohammed Khenfouch
- Africa Graphene Center, Department of Physics, College of Science, Engineering and Technology, Science Campus, University of South Africa, Cnr Christiaan de Wet & Pioneer Avenue, Florida 1709, Johannesburg, South Africa;
| | - Mohamed Achehboune
- Group of Nanomaterials and Renewable Energies, Laboratory of Solid State Physics, Faculty of Sciences Dhar el Mahraz, Sidi Mohammed Ben Abdellah University, P.O. Box 1796, Atlas Fez 30 000, Morocco; (I.B.); (M.A.); (M.G.); (A.J.); (I.Z.)
- Africa Graphene Center, Department of Physics, College of Science, Engineering and Technology, Science Campus, University of South Africa, Cnr Christiaan de Wet & Pioneer Avenue, Florida 1709, Johannesburg, South Africa;
| | - Liviu Leontie
- Faculty of Physics, Alexandru Ioan Cuza University of Iasi, Bulevardul Carol I, nr. 11, 700506 Iasi, Romania;
| | - Aurelian Catalin Galca
- Laboratory of Multifunctional Materials and Structures, National Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, Romania;
| | - Monica Enculescu
- Laboratory of Multifunctional Materials and Structures, National Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, Romania;
- Correspondence:
| | - Aurelian Carlescu
- Integrated Center for Studies in Environmental Science for North-East Region, Alexandru Ioan Cuza University of Iasi, Bulevardul Carol I, nr. 11, 700506 Iasi, Romania;
| | - Mohammed Guerboub
- Group of Nanomaterials and Renewable Energies, Laboratory of Solid State Physics, Faculty of Sciences Dhar el Mahraz, Sidi Mohammed Ben Abdellah University, P.O. Box 1796, Atlas Fez 30 000, Morocco; (I.B.); (M.A.); (M.G.); (A.J.); (I.Z.)
| | - Bakang Moses Mothudi
- Department of Physics, University of South Africa, Private Bag X90, Florida 1710, South Africa;
| | - Anouar Jorio
- Group of Nanomaterials and Renewable Energies, Laboratory of Solid State Physics, Faculty of Sciences Dhar el Mahraz, Sidi Mohammed Ben Abdellah University, P.O. Box 1796, Atlas Fez 30 000, Morocco; (I.B.); (M.A.); (M.G.); (A.J.); (I.Z.)
| | - Izeddine Zorkani
- Group of Nanomaterials and Renewable Energies, Laboratory of Solid State Physics, Faculty of Sciences Dhar el Mahraz, Sidi Mohammed Ben Abdellah University, P.O. Box 1796, Atlas Fez 30 000, Morocco; (I.B.); (M.A.); (M.G.); (A.J.); (I.Z.)
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Kim JS, Oh HB, Kim AH, Kim JS, Lee ES, Baek JY, Lee KS, Chung SC, Jun JH. A study on detection of glucose concentration using changes in color coordinates. Bioengineered 2017; 8:99-104. [PMID: 27775502 DOI: 10.1080/21655979.2016.1227629] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
Abstract
Glucose concentration is closely related to the metabolic activity of cells and it is the most important substance as the energy source of a living body which plays an important role in the human body. This paper proposes an optical method that can measure the concentration of glucose. The change in glucose concentration was observed by using CIE diagram, and wavelength and purity values were detected. Also, even small changes in glucose concentration can be evaluated through mathematical modeling. This system is simple, economical, and capable of quantifying optical signals with numerical values for glucose sensing. This method can be applicable to the clinical field that examines diabetes mellitus or metabolic syndrome.
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Affiliation(s)
- Ji-Sun Kim
- a Department of Biomedical Engineering , BK21Plus Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University , Chungju , Republic of Korea
| | - Han-Byeol Oh
- a Department of Biomedical Engineering , BK21Plus Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University , Chungju , Republic of Korea
| | - A-Hee Kim
- a Department of Biomedical Engineering , BK21Plus Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University , Chungju , Republic of Korea
| | - Jun-Sik Kim
- a Department of Biomedical Engineering , BK21Plus Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University , Chungju , Republic of Korea
| | - Eun-Suk Lee
- a Department of Biomedical Engineering , BK21Plus Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University , Chungju , Republic of Korea
| | - Jin-Young Baek
- a Department of Biomedical Engineering , BK21Plus Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University , Chungju , Republic of Korea
| | - Ki Sung Lee
- b Yon-Sei Family Clinic , Kimpo , Republic of Korea
| | - Soon-Cheol Chung
- a Department of Biomedical Engineering , BK21Plus Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University , Chungju , Republic of Korea
| | - Jae-Hoon Jun
- a Department of Biomedical Engineering , BK21Plus Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University , Chungju , Republic of Korea
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Joshi C, Dwivedi A, Rai SB. Structural morphology, upconversion luminescence and optical thermometric sensing behavior of Y2O3:Er(3+)/Yb(3+) nano-crystalline phosphor. Spectrochim Acta A Mol Biomol Spectrosc 2014; 129:451-456. [PMID: 24751781 DOI: 10.1016/j.saa.2014.03.048] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [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: 11/30/2013] [Revised: 03/01/2014] [Accepted: 03/21/2014] [Indexed: 06/03/2023]
Abstract
Infrared-to-visible upconverting rare earths Er(3+)/Yb(3+) co-doped Y2O3 nano-crystalline phosphor samples have been prepared by solution combustion method followed by post-heat treatment at higher temperatures. A slight increase in average crystallite size has been found on calcinations verified by X-ray analysis. Transmission electron microscopy (TEM) confirms the nano-crystalline nature of the as-prepared and calcinated samples. Fourier transform infrared (FTIR) analysis shows the structural changes in as-prepared and calcinated samples. Upconversion and downconversion emission recorded using 976 and 532 nm laser sources clearly demonstrates a better luminescence properties in the calcinated samples as compared to as-prepared sample. Upconversion emission has been quantified in terms of standard chromaticity diagram (CIE) showing a shift in overall upconversion emission of as-prepared and calcinated samples. Temperature sensing behaviour of this material has also been investigated by measurement of fluorescence intensity ratio (FIR) of various signals in green emission in the temperature range of 315 to 555 K under 976 nm laser excitation.
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Affiliation(s)
- C Joshi
- Department of Physics and Astrophysics, University of Delhi, Delhi 110007, India
| | - A Dwivedi
- Laser & Spectroscopy Laboratory, Department of Physics, Banaras Hindu University, Varanasi 221005, India
| | - S B Rai
- Laser & Spectroscopy Laboratory, Department of Physics, Banaras Hindu University, Varanasi 221005, India.
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Aswani T, Babu B, Manjari VP, Stella RJ, Rao GT, Krishna CR, Ravikumar RVSSN. Synthesis and spectral characterizations of trivalent ions (Cr3+, Fe3+) doped CdO nanopowders. Spectrochim Acta A Mol Biomol Spectrosc 2013; 121:544-550. [PMID: 24291431 DOI: 10.1016/j.saa.2013.11.018] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [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: 09/17/2013] [Revised: 11/04/2013] [Accepted: 11/05/2013] [Indexed: 06/02/2023]
Abstract
Trivalent transition metal ions (Cr(3+), Fe(3+)) doped CdO nanopowders via sonication in the presence of Sodium lauryl sulfate as stabilizing agent were synthesized and characterized. Powder XRD studies indicate that the obtained CdO has a cubic phase and concluded that the trivalent ions doping induced the lattice constants to change some extent. Optical absorption spectra exhibited the characteristic bands of Cr(3+) and Fe(3+) ions in octahedral site symmetry. Crystal field (Dq) and inter-electronic repulsion (B and C) parameters are evaluated for Cr(3+) doped CdO nanopowders as Dq=1540, B=619 and C=3327 cm(-1) and for Fe(3+) doped CdO nanopowders Dq=920, B=690, C=2750 cm(-1). EPR spectra of the Cr(3+) and Fe(3+) doped CdO nanopowders exhibited resonances at g=1.973 and g=2 respectively which indicate distorted octahedral site for both ions with the host. Photoluminescence spectra shows the emission bands in violet and bluish green regions for Cr(3+) doped CdO, ultraviolet and blue emissions for Fe(3+) doped CdO nanopowders. The CIE chromaticity coordinates were also evaluated from the emission spectrum. FT-IR spectra indicate the presence of various functional groups of host lattice.
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Affiliation(s)
- T Aswani
- Department of Physics, University College of Sciences, Acharya Nagarjuna University, Nagarjuna Nagar-522510, AP, India
| | - B Babu
- Department of Physics, University College of Sciences, Acharya Nagarjuna University, Nagarjuna Nagar-522510, AP, India
| | - V Pushpa Manjari
- Department of Physics, University College of Sciences, Acharya Nagarjuna University, Nagarjuna Nagar-522510, AP, India
| | - R Joyce Stella
- Department of Physics, University College of Sciences, Acharya Nagarjuna University, Nagarjuna Nagar-522510, AP, India
| | - G Thirumala Rao
- Department of Physics, University College of Sciences, Acharya Nagarjuna University, Nagarjuna Nagar-522510, AP, India
| | - Ch Rama Krishna
- Department of Physics, University College of Sciences, Acharya Nagarjuna University, Nagarjuna Nagar-522510, AP, India
| | - R V S S N Ravikumar
- Department of Physics, University College of Sciences, Acharya Nagarjuna University, Nagarjuna Nagar-522510, AP, India.
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