Current Applied Physics最新文献

{"title":"Photoluminescence and electrochemical studies of Ce3+-doped Zn2V2O7 nanoparticles synthesized via green route","authors":"Vinuta ,&nbsp;H.C. Manjunatha ,&nbsp;Y.S. Vidya ,&nbsp;S. Manjunatha ,&nbsp;R. Munirathnam ,&nbsp;M. Shivanna ,&nbsp;Suman Kumar ,&nbsp;K.N. Sridhar","doi":"10.1016/j.cap.2025.03.008","DOIUrl":"10.1016/j.cap.2025.03.008","url":null,"abstract":"<div><div>Zn₂V₂O₇:Ce Nanoparticles (NPs) (ZV:Ce), are produced by a solution combustion process mediated by an extract from <span><math><mi>M</mi><mi>e</mi><mi>n</mi><mi>t</mi><mi>h</mi><mi>a</mi><mi>s</mi><mi>p</mi><mi>i</mi><mi>c</mi><mi>a</mi><mi>t</mi><mi>a</mi></math></span> leaves. The diffraction pattern shows alignment with the ZV host matrix. The crystals grown with monoclinic crystal structure and <span><math><mi>C</mi><mn>2</mn><mo>/</mo><mi>c</mi><mo>(</mo><mn>2</mn><mo>/</mo><mi>m</mi><mo>)</mo></math></span> space group. Furthermore, as the dopant concentration changes, a shift in the diffraction pattern was noticed. Scherrer's approach yielded a crystallite size that nearly matched the results of transmission electron microscopy research. The surface morphology changes from irregularly shaped NPs to hexagonal ones. Furthermore, a modulation of E_<em>g</em> is shown by Tauc's plot analysis of the UV-visible absorption spectra, which shifts from 2.98 to 2.87 eV with increasing dopant quantity. The PL emission spectra at 310 nm consist of peaks located at 417, 457, 482 and 526 nm. The emission peaks at 417, 457 and 482 nm belong to the 5D_3/2 → ²F_7/2 transition and 526 nm can be attributed to the 5D_3/2 → ²F_7/2 transition of Ce³⁺ within the host matrix. The CIE coordinates fall in the light blue emission region. The average CCT of 9078 K shows a cooler appearance. From all these results, the present nano phosphor materials might be a promising candidate in blue LEDs and in display technology. The materials showing a cooler appearance find applications in museums, galleries, offices, outdoor lighting, etc. Electrochemical studies revealed that super capacitance values ranged from 94.67 to 158.12 F/g at a scan rate of 10 mV/s, with increasing Ce³⁺ quantity in Zn₂V₂O₇ nanoparticles.</div></div>","PeriodicalId":11037,"journal":{"name":"Current Applied Physics","volume":"74 ","pages":"Pages 1-11"},"PeriodicalIF":2.4,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143696858","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Electronic properties of bilayer graphene/Janus MoSTe heterostructure","authors":"Junho Yun,&nbsp;Dongchul Sung,&nbsp;Yunjae Kim,&nbsp;Suklyun Hong","doi":"10.1016/j.cap.2025.03.010","DOIUrl":"10.1016/j.cap.2025.03.010","url":null,"abstract":"<div><div>A notable feature of 2D materials is their ability to form van der Waals heterostructures, enabling tailored electronic properties. Among these, Janus TMDs, with their asymmetric structure and dipole moment, exhibit unique properties like piezoelectricity, Rashba effect, and catalytic activity. In this study, we have performed density functional theory (DFT) calculations to investigate the electronic properties of a heterostructure composed of bilayer graphene (BLG) and a Janus MoSTe monolayer, focusing on the difference in interfacial contact behaviors between them. Our calculations indicate that the Dirac cone in BLG within the BLG/Janus MoSTe heterostructure opens due to electron transfer at the metal-semiconductor interface and the electric field generated by the asymmetry of Janus MoSTe. Depending on the contact orientation, this interaction results in BLG's bandgaps of 46 meV and 70 meV, respectively, highlighting the tunability and potential applications of BLG/Janus TMD heterostructures in optoelectronic devices.</div></div>","PeriodicalId":11037,"journal":{"name":"Current Applied Physics","volume":"74 ","pages":"Pages 12-18"},"PeriodicalIF":2.4,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143714479","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fire-resistant layered carbon composite panels from used cotton cloth for thermal insulation and EMI shielding applications","authors":"Raji S,&nbsp;K. Prabhakaran","doi":"10.1016/j.cap.2025.03.007","DOIUrl":"10.1016/j.cap.2025.03.007","url":null,"abstract":"<div><div>A process for preparing thermally insulating carbon composite panels (CCP) from used cotton cloth is reported. The pliable cotton cloth is transformed into rigid carbon grid sheets by carbonization after impregnation with a sucrose solution. The layered carbon composite panels are obtained by hand layup of phenol-formaldehyde (PF) polymer solution-impregnated carbon grid sheet followed by curing and carbonization. The carbon composite panels exhibit grid-like pores in the X-Y plane and lamellar-type pores in the lateral plane. Due to their layered structure, the carbon composite panels exhibit pseudo-plastic failure under flexural mode. The density, compressive strength, and flexural strength are modulated in the ranges of 0.45 ± 0.0004 to 0.57 ± 0.0068 g cm⁻³, 0.86 ± 0.04 to 2.03 ± 0.10 MPa, and 2.6 ± 0.11 to 4.5 ± 0.16 MPa, respectively, by varying the PF solution concentrations from 60 to 100 vol%. The carbon composite panels exhibit oxidation resistance up to 470 °C, excellent fire resistance, and low thermal conductivity in the 0.187 ± 0.0004 to 0.273 ± 0.0014 W m⁻¹. K⁻¹ range. The high EMI shielding effectiveness in the range of 40–67 dB exhibited by the carbon composite panels of 5 mm thickness is due to the conductive and dielectric losses and multiple internal reflections within the grid-like and lamellar-type pores.</div></div>","PeriodicalId":11037,"journal":{"name":"Current Applied Physics","volume":"73 ","pages":"Pages 117-126"},"PeriodicalIF":2.4,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143654735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Structural and optoelectronic analysis of a novel perylene diimide as a light-harvesting material for dye-sensitized solar cells","authors":"Twinkle Khanna ,&nbsp;Subhrajit Konwar ,&nbsp;Saloni Saloni ,&nbsp;S.N.F. Yusuf ,&nbsp;Pramod K. Singh ,&nbsp;Geeta Durga","doi":"10.1016/j.cap.2025.03.006","DOIUrl":"10.1016/j.cap.2025.03.006","url":null,"abstract":"<div><div>Perylene diimides (PDIs) have emerged as an excellent n-type semiconductor substitute for fullerenes in energy devices. A novel PDI, N, N′-bis-(2-phenylethyl)-3,4,9,10-perylene bis(dicarboximide)(PDEA), was synthesized and its structure was thoroughly characterized using Fourier transforms infrared spectroscopy (FTIR), High-resolution mass spectroscopy (HRMS), Proton Nuclear magnetic resonance (¹H NMR). The optical properties of the PDI were evaluated using UV–visible, and Photoluminescence (PL) spectroscopic techniques. The UV–Visible spectrum of PDEA exhibited a broad absorption band in the visible range (400–800 nm), with yellowish-green fluorescence emission under a UV lamp. The structure of PDEA was optimized using Density Functional Theory (DFT) with the B3LYP/6-31G (d, p) basis set, and its optoelectronic properties were evaluated in a variety of solvents of different polarities. Further, Cyclic Voltammetry (CV) was utilized to examine the electrochemical redox behaviour of PDEA in acetonitrile which was observed to be one-electron quasi-reversible. The as-synthesized PDEA was used to fabricate the DSSC and was found to exhibit a good photovoltaic performance with a fill factor (FF) of 72, an open-circuit voltage (V_oc) of 0.52 V, a PCE (power conversion efficiency) of 0.63 %, and a Jsc (short circuit current density) of 1.67 mA/cm². The above-mentioned characteristics of the PDEA may have applications in photovoltaics, fluorescence-based detectors, n-channel field-effect transistors, and other related areas.</div></div>","PeriodicalId":11037,"journal":{"name":"Current Applied Physics","volume":"73 ","pages":"Pages 127-135"},"PeriodicalIF":2.4,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143680654","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis and characterization of PVA/KC/NaYF4:Eu3+ composite fluorescent films","authors":"Xiangyuan Duan,&nbsp;Shuyan Xu","doi":"10.1016/j.cap.2025.03.005","DOIUrl":"10.1016/j.cap.2025.03.005","url":null,"abstract":"<div><div>Fluorescent composite films were prepared using polyvinyl alcohol (PVA) as the substrate and NaYF₄:Eu³⁺ phosphors and κ-carrageenan powder (KC) as the fillers by the casting method. The impact of incorporating NaYF₄:Eu³⁺ on the structural, morphological, mechanical property, thermal stability, and optical characteristics of PVA/KC films was examined. The incorporation of KC promoted the formation of hydrogen bonds between KC and PVA. Consequently, the water contact angle of the films increased by approximately 10°, indicating improved water resistance. Meanwhile, the incorporation of NaYF₄:Eu³⁺ increased the thermal stability of the films, with the temperature at 5 % mass loss rising by approximately 13 °C. Additionally, the mass retention at 600 °C improved by 3.47 %. Notably, the addition of NaYF₄:Eu³⁺ had a negligible effect on the transparency of the films while imparting fluorescent properties. Under UV excitation at 395 nm, the films exhibited maximum fluorescence intensity at 616 nm, indicating a significant fluorescence effect.</div></div>","PeriodicalId":11037,"journal":{"name":"Current Applied Physics","volume":"73 ","pages":"Pages 136-144"},"PeriodicalIF":2.4,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143680655","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Up-conversion phosphor LaCaGaO4: Er3+/Yb3+ for the optical temperature sensing and anti-counterfeiting","authors":"Shengyi Liu ,&nbsp;Shang Gao ,&nbsp;Duan Gao ,&nbsp;Li Wang ,&nbsp;Wenbin Song ,&nbsp;Han Yin ,&nbsp;Ying Zhu ,&nbsp;Jingjing Zhang ,&nbsp;Qianmiao Yu ,&nbsp;Xin Chen","doi":"10.1016/j.cap.2025.03.001","DOIUrl":"10.1016/j.cap.2025.03.001","url":null,"abstract":"<div><div>Successfully synthesized LaCaGaO₄: Er³⁺ and LaCaGaO₄: Er³⁺/Yb³⁺ phosphors via high-temperature solid-state reactions and thoroughly investigated their up-conversion luminescence properties under 980 nm and 1550 nm excitation. X-ray diffraction analysis confirmed the phase purity of the materials, and up-conversion luminescence measurements demonstrated emissions in the visible and near-infrared regions, primarily at 530 nm, 550 nm, 670 nm, and 810 nm, corresponding to Er³⁺ transitions. Mechanistic studies revealed that under 980 nm excitation, both green and red emissions are two-photon processes, while under 1550 nm excitation, these emissions are driven by three-photon processes. Co-doping with Yb³⁺ enhanced luminescence intensity, with an increase in the red-to-green emission ratio as the Yb³⁺ concentration increased. Furthermore, these materials exhibited excellent temperature sensing capabilities, with fluorescence intensity ratios from thermally coupled energy levels showing good agreement with the Boltzmann distribution. Maximum sensitivities S_A^MAX of 0.00054 K^-1 (980 nm excitation) and 0.00632 K^-1 (1550 nm excitation) were achieved, highlighting their potential for applications in optical thermometry, color tuning, and anti-counterfeiting.</div></div>","PeriodicalId":11037,"journal":{"name":"Current Applied Physics","volume":"73 ","pages":"Pages 84-97"},"PeriodicalIF":2.4,"publicationDate":"2025-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143610322","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pedagogical approach to anomalous position and velocity","authors":"Younsik Kim ,&nbsp;Suk Bum Chung ,&nbsp;Changyoung Kim","doi":"10.1016/j.cap.2025.03.003","DOIUrl":"10.1016/j.cap.2025.03.003","url":null,"abstract":"<div><div>In this work, we discuss a pedagogical method in deriving the expressions for anomalous position and velocity. While we follow the steps used in optics in the derivation of the group velocity, we use Bloch wave functions instead of plane wave states. In comparison to the plane wave case, application of Bloch wave functions results in two additional terms in the expression of the group velocity: the Berry phase factor and anomalous position contributions. These two new terms with distinct origins eventually lead to the known anomalous velocity. Aiming for an intuitive understanding, we simulate the situation under an electric field using linear-combination-of-atomic-orbital states and visually demonstrate that the envelope function exhibits the transverse motion expected from an anomalous velocity.</div></div>","PeriodicalId":11037,"journal":{"name":"Current Applied Physics","volume":"73 ","pages":"Pages 112-116"},"PeriodicalIF":2.4,"publicationDate":"2025-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143629562","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhancement of barrier protection of organic coatings with the incorporation of graphene oxide as a reinforcing filler","authors":"Sachin Sharma Ashok Kumar ,&nbsp;K. Ramesh ,&nbsp;S. Ramesh","doi":"10.1016/j.cap.2025.03.004","DOIUrl":"10.1016/j.cap.2025.03.004","url":null,"abstract":"<div><div>Graphene and its derivatives, such as graphene oxide (GO) are new materials with unique properties which have been widely employed as a reinforcing filler material in organic coatings. The superior properties of GO, such as its large surface area, surface wettability, stability, chemical resistance, and high mechanical strength, have resulted the GO material to be a promising additive in anti-corrosion coatings. On the other hand, due to the presence of oxygen-containing functional groups, the GO has exhibited high water dispersibility. In addition, the chemical functionalization that is facilitated by these functional groups on the GO surface resulted in the enhancement of dispersibility and corrosion protection performance. Hence, the GO-based polymer coatings have attracted significant attention globally especially in the corrosion industry. Although, the electrochemical characteristics of GO-polymer nanocomposite coatings have not been explored much. Therefore, in this study, a series of coatings were developed by incorporating various amounts of GO nanoparticles into the polymer matrix. These coatings were then coated on the steel substrates and the barrier protection performance of GO-based coatings was investigated using electrochemical impedance spectroscopy (EIS). In addition, the electrochemical activity was observed by determining the breakpoint frequencies (<span><math><mrow><msub><mi>f</mi><mi>b</mi></msub></mrow></math></span>) over a period of 90 days. The results revealed that the incorporation of GO nanoparticles significantly enhanced the corrosion protection performance of the coatings. The results demonstrated that the best corrosion resistance was achieved by the 0.5 % GO coating sample. Fourier transform infrared (FTIR) spectroscopy was employed to verify the chemical structure of the composite coatings.</div></div>","PeriodicalId":11037,"journal":{"name":"Current Applied Physics","volume":"73 ","pages":"Pages 98-111"},"PeriodicalIF":2.4,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143620891","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Self-annealing behavior of an Mg-Dy alloy processed by high-pressure torsion","authors":"Siham Koriche ,&nbsp;Abdelkader Khalfallah ,&nbsp;Hiba Azzeddine ,&nbsp;Thierry Baudin ,&nbsp;François Brisset ,&nbsp;Yi Huang ,&nbsp;Terence G. Langdon","doi":"10.1016/j.cap.2025.02.010","DOIUrl":"10.1016/j.cap.2025.02.010","url":null,"abstract":"<div><div>An investigation was conducted to evaluate the microstructure, texture and microhardness of an Mg-0.4Dy (wt.%) alloy processed by high-pression torsion (HPT) for 15 turns and then self-annealed at ambient temperature for six years. Electron backscatter diffraction (EBSD) and Vickers microhardness were carried out near the centre, mid-radius and edge of each disc. The results show that self-annealing leads to a slight increase in the average grain size from 0.7 to 1 μm. The basal texture was retained at the centres and edges of the discs while the <em>C</em>_<em>1</em>-fiber vanished near the mid-radius of the self-annealed disc. The value of the microhardness remained constant along the radii of the discs but the dislocation density, originating from the geometrically necessary dislocations (GND), increased significantly after self-annealing due to the development of sub-grain boundaries with misorientations of 2°&lt; θ &lt; 5°. Based on these results, it is concluded that self-annealing of the HPT-processed Mg-0.4Dy alloy is controlled by a recovery process.</div></div>","PeriodicalId":11037,"journal":{"name":"Current Applied Physics","volume":"73 ","pages":"Pages 41-48"},"PeriodicalIF":2.4,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143580436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis of Cu2O/ZnO fiber heterojunction networks for self-powered visible-light photodetectors with rapid response","authors":"Yiran Wang ,&nbsp;Senzhuo Xing ,&nbsp;Nan Zhang","doi":"10.1016/j.cap.2025.03.002","DOIUrl":"10.1016/j.cap.2025.03.002","url":null,"abstract":"<div><div>The network-based self-powered photodetector features a large interfacial area, enhancing light absorption and charge carrier generation, along with its mechanical robustness, enabling integration into various applications. In this study, we propose a novel self-powered photodetector based on an AZO/ZnO/Cu₂O/Ag network architecture, fabricated using electrodeposition and atomic layer deposition techniques. The fabricated photodetector exhibits a detection wavelength range extending from 390 nm to 780 nm at zero bias, covering the visible spectrum. With a maximum responsivity of 1.6 mA/W and a response time of 5 μs, the device showcases excellent sensitivity and rapid detection capabilities. X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), X-ray diffraction (XRD), and optoelectronic performance testing were employed to analyze the operating mechanism of the photodetector. It was found that the spatial charge region formed at the interface between Cu₂O and ZnO layers plays a crucial role in enabling the self-powered operation of the photodetector. Our work provides a new strategy for the development of high-performance network photodetectors.</div></div>","PeriodicalId":11037,"journal":{"name":"Current Applied Physics","volume":"73 ","pages":"Pages 77-83"},"PeriodicalIF":2.4,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143601634","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}