ESR studies to elucidate the origin of the RPL emission of undoped-CaSO4

Journal of Materials Science: Materials in Electronics

Published On 2023/10

Recent research has shown that CaSO4, without any intentional addition of impurities, exhibits remarkable radiophotoluminescence (RPL) properties. However, the origin of the RPL in CaSO4 has yet to be fully understood. ESR measurements were carried out to identify the defect species responsible for RPL and elucidate the luminescence’s origin. ESR measurements on undoped-CaSO4 with different radiation sensitivities showed SO4−, SO2−+SO3−, PO42−, Si=O3 in P2O5–SiO2 (E’ center), Al2O3 hole center and Mn2+ defect species in CaSO4. This means that CaSO4 contains Al2O3, Mn2+, P, and Si as impurities, which are not intentionally added to CaSO4. As the results of this study, the different impurity states may influence the radiation sensitivity of the materials. It is suggested that the deliberate addition of P and Si elements, Al2O3 and Mn2+ could control the RPL properties.

Journal

Journal of Materials Science: Materials in Electronics

Published On

2023/10

Volume

34

Issue

28

Page

1972

Authors

Hidehito Nanto

Hidehito Nanto

Kanazawa Institute of Technology

Position

H-Index(all)

44

H-Index(since 2020)

19

I-10 Index(all)

0

I-10 Index(since 2020)

0

Citation(all)

0

Citation(since 2020)

0

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0

Research Interests

Odor sensor

Dosimeter

Thin films

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Article Details
Hidehito Nanto

Hidehito Nanto

Kanazawa Institute of Technology

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Article Details
Hidehito Nanto

Hidehito Nanto

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Article Details
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Article Details
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Article Details
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Journal of Materials Science: Materials in Electronics

Structural, electrical, and magnetic properties of (x)Cu0.05Co0.95Fe2O4/(1 − x)La0.15Bi0.85FeO3 nanocomposites for technological applications

A series of (x)Cu0.05Co0.95Fe2O4/(1–x) La0.15Bi0.85FeO3 (CCFO/LBFO) based nanocomposites has been prepared for varying concentrations of CCFO (x = 0.1, 0.2, 0.3, 0.4, and 0.5). The formation of the required phase was confirmed using X-ray diffraction technique. Transmission electron microscope was used to investigate the surface morphology and particle distribution of the prepared nanocomposites. Electrical properties analysis such as impedance, electric modulus, and dietetic shows that the sample has active grain boundaries due to charge accumulation at low frequencies which transforms into subsequent grain activity as the frequency approaches higher values. The prepared nanocomposites were analyzed using vibrating sample magnetometer to study the magnetic properties. The increase in saturation magnetization and retentivity was investigated with increasing the concentrations of CCFO …

M. Mujahid Alam

M. Mujahid Alam

King Khalid University

Journal of Materials Science: Materials in Electronics

Photoluminescence and structural properties of NaBaBi2[PO4]3 an Eulytite-type orthophosphate doped with Sm3+ as new orange-red emitting phosphors

A series of NaBaBi2[PO4]3 doped with Sm3+ (NaBaBi2−x[PO4]3:xSm3+; x = 0.025, 0.05, 0.075, 0.1, 0.3, and 0.5) phosphors were prepared using a solid-state reaction method in the present study. To evaluate the crystallinity and purity of the phosphor, XRD analysis was employed. To establish the morphology and elemental analyses of the phosphors, FESEM with EDX was adopted. Investigations into the phosphors’ photoluminescence properties were extensively studied. The phosphor exuded many strong Sm3+ ion emission peaks, oriented at 563, 601, and 644 nm, respectively. The transition 4G5/2 → 6H7/2 of Sm3+ emits the most vivid orange-red light at 601 nm. According to Dexter’s hypothesis, quenching happens as a result of dipole–dipole interaction at x = 0.1, the ideal concentration of the Sm3+ doped phosphor. The critical distance for phosphor is 17.27 Å. It was established that the phosphor’s …

Puspendu Guha

Puspendu Guha

Seoul National University

Journal of Materials Science: Materials in Electronics

Non-enzymatic glucose sensors based on electrodeposited CuxO–ZnO composite nanostructures

The present study investigates the non-enzymatic glucose sensing properties of Cu O–ZnO (x= 1, 2) composite nanostructures that have been fabricated using a simple and fast co-electrodeposition (CED) method. Two concentrations of Cu were used and interestingly, for the lower concentration, the fabricated (C) nanostructures are of Cu O–ZnO type while for the higher concentration (C), nanostructures show a mixed Cu O–ZnO (x= 1, 2) nature. Although both the samples exhibit a good catalytic response for non-enzymatic glucose sensing, the C sample shows a far superior response. Along with a high sensitivity of 384.6 µA mM cm, a large linear range of 0.03–3 mM, and a low least detection limit (LOD) of 0.7 µM, C also demonstrates a good long-term stability, good reproducibility, and good selectivity toward glucose detection, even in the presence of interfering species. The synergistic effect of Cu O …

Hassan Sedghi

Hassan Sedghi

Urmia University

Journal of Materials Science: Materials in Electronics

Investigation of optical and electrical properties of TiO2, SiO2, and Ag single and multilayer thin films using spectroscopic ellipsometry and spectrophotometry methods …

We have investigated the electrical and optical properties of erbium (Er3+) doped TiO2 thin films (Er:TiO2 TFs) grown by sol–gel technique on glass and silicon substrates. The samples were characterized by field emission gun–scanning electron microscopes (FEG–SEM), energy dispersive X-ray spectroscopy (EDX), atomic force microscopy (AFM), X-ray diffraction (XRD), photoluminescence (PL) and current–voltage measurement techniques. FEG–SEM and AFM images showed the morphological change in the structure of Er:TiO2 TFs and EDX analysis confirmed the Er3+ doped into TiO2 lattice. Broad PL emissions in visible and infrared regions were observed in undoped TiO2 samples and associated to different mechanisms due to the anatase and rutile phases. PL spectra revealed sharp peaks at 525 nm, 565 nm, 667 nm and 1.54 µm which are related to Er3+ emissions in Er:TiO2 samples. The …

Ammar Tighezza

Ammar Tighezza

King Saud University

Journal of Materials Science: Materials in Electronics

SILAR-synthesized Co3O4/Bi2O3 on copper substrate nanocomposite electrode and asymmetric Co3O4/Bi2O3/CuO: AC solid-state device in supercapacitor

Hexagonal nanosheets like mesoporous nanostructures were developed on the flexible copper substrate as a binder-free thin-film electrode via a simple and cost-effective successive ionic layer adsorption and reaction (SILAR) technique. Among the numerous deposition techniques available for supercapacitor applications, this one was the most affordable and straightforward. Contact angle examination confirmed the hydrophilic nature of the deposited material. The obtained cobalt oxide/bismuth oxide/copper oxide electrode exhibited a notable specific capacitance (SC) of 1777.12 F/g at 2 mV/s in 1 M KOH and cycling stability (83.53% capacity holding after 5000 cycles). Furthermore, the asymmetric solid-state supercapacitor device assembled with cobalt oxide/bismuth oxide/copper oxide as a positive thin-film electrode and activated carbon (AC) as a negative thin-film electrode demonstrated a high specific …

Dr.Baradi Waryani, Professor (Associate)

Dr.Baradi Waryani, Professor (Associate)

University of Sindh

Journal of Materials Science: Materials in Electronics

Utilizing CuO nanostructures derived from sugar molasses for the detection of xanthine

This study developed a non-enzymatic electrochemical sensor for measuring xanthine using CuO nanostructures made from sugar molasses. The influence of sugar molasses on the surface morphology, crystallization, and optical properties of CuO nanostructures have been investigated during low-temperature aqueous chemical growth method. The influence of different amounts of sugar molasses such as 1 mL (sample 1) and 2 mL (sample 2) on the shape, optical, and crystalline properties of CuO nanostructures was evaluated. The monoclinic phase of sugar molasses CuO nanostructures was confirmed and heterogeneity in the shape orientation was also observed. The optical characterization has revealed a decrease in the optical band gap from 3.36 eV, 2.90 eV, and 2.36 eV for the pure CuO, sample 1, and sample 2, respectively. The proposed CuO nanostructures were found highly active toward …

Safa Kasap

Safa Kasap

University of Saskatchewan

Journal of Materials Science: Materials in Electronics

29 December 2023 Professor Patrick McNally Dublin City University, Ireland Former Deputy Editor-in-Chief

With much sadness, we announce the passing away of Professor Patrick McNally, who unexpectedly left us on December 29, 2023. Professor McNally was an editorial member, Editor and then the Deputy Editor-in-Chief of this journal for 20+ years. He was much liked and much respected by his colleagues in the journal and served the scientific publishing community with high-spirited enthusiasm and unselfish dedication. As the Deputy Chief Editor, he had to deal with numerous misconduct and fraudulent data complaints. He investigated each with utmost integrity and did not leave any stone unturned until he arrived at a just decision, even if it meant retracting a paper. We all trusted his judgement and we all appreciated the endless time and effort he put into maintaining the journal’s high standards. He became a role model to new editors. Professor McNally also promoted the involvement of more women in …

Suat Pat

Suat Pat

Eskisehir Osmangazi Üniversitesi

Journal of Materials Science: Materials in Electronics

Optical and electric characteristics of CuO nanoparticle-doped ZnO thin films using thermionic vacuum arc deposition system

In this study, the thermionic vacuum arc (TVA) method was employed to fabricate thin films of zinc oxide (ZnO) doped with copper oxide nanoparticles (CuONPs). The primary objective was to investigate the influence of the substrate on the characteristics of the CuONPs-doped ZnO thin films. CuONPs were synthesized using both the solution plasma process and the high-voltage liquid plasma generation method, resulting in particle sizes ranging from 20 to 40 nm. The X-ray diffraction (XRD) pattern confirmed the polycrystalline nature of the CuONPs. The prepared CuONPs in powder form were blended with ZnO powder and utilized as an anode material for TVA discharge and coating. The structural, optical, elemental, and topological properties of the resulting thin films were systematically examined. The findings revealed that the deposited thin films exhibited a polycrystalline structure, with transparent and …

Priscy Alfredo Luque Morales

Priscy Alfredo Luque Morales

Universidad Autónoma de Baja California

Journal of Materials Science: Materials in Electronics

Role of natural extracts on the synthesis and properties of semiconductor nanoparticles of ZnO applied in water treatment by photocatalytic processes

One of the most pressing issues that the world is currently facing is water contamination. Photocatalysis using semiconductor nanoparticles (NPs) is a promising and potential alternative for water treatment. In this research, zinc oxide (ZnO) NPs were synthesized using Ternstroemia pringlei Rose (FT), Turnera diffusa Willd (DC), and Agastache mexicana (TM) extracts, as an eco-friendly approach. The properties of ZnO NPs were evaluated by different characterization techniques. According to XRD patterns, a hexagonal Wurtzite structure was achieved for all syntheses. FTIR spectra exhibited stretching vibrations of the Zn–O bond at 397 cm−1, which indicates the formation of ZnO. The bandgap was found to vary depending on the extract source. Furthermore, PL spectra showed UV and visible emission associated with free exciton and structural defects in ZnO. A quasi-spherical shape and sizes of less than 20 nm …