Pub Date : 2025-02-11DOI: 10.1016/j.cap.2025.02.005
Sanghyun Park , Jaeuk Baek , Min-Hwan Lee , Sanglok Lee , Geol Moon
We achieved long-term polarization stabilization of the output beam obtained from polarization-maintaining (PM) fiber by feeding heat back to the fiber. Optical polarization stability is crucial in various fundamental and engineering fields, particulary in a miniaturized field-deployable system composed of optical components, such as cold-atom-based quantum sensors. We constructed a feedback loop to stabilize the polarization of the output beam of a PM fiber in thermal contact with a Peltier element. Notably, a long-term polarization stability against thermal fluctuations was achieved, and the characteristics of the thermal polarization stabilizer were analyzed based on the power spectral density, Allan deviation, and Bode plots. The results indicate that this system can effectively serve as a long-term intensity stabilizer and is ideal for use in laboratories in which PM fibers are widely used, but exact temperature regulation is not feasible.
{"title":"Long-term polarization stabilization of a polarization maintaining fiber via dynamic temperature control","authors":"Sanghyun Park , Jaeuk Baek , Min-Hwan Lee , Sanglok Lee , Geol Moon","doi":"10.1016/j.cap.2025.02.005","DOIUrl":"10.1016/j.cap.2025.02.005","url":null,"abstract":"<div><div>We achieved long-term polarization stabilization of the output beam obtained from polarization-maintaining (PM) fiber by feeding heat back to the fiber. Optical polarization stability is crucial in various fundamental and engineering fields, particulary in a miniaturized field-deployable system composed of optical components, such as cold-atom-based quantum sensors. We constructed a feedback loop to stabilize the polarization of the output beam of a PM fiber in thermal contact with a Peltier element. Notably, a long-term polarization stability against thermal fluctuations was achieved, and the characteristics of the thermal polarization stabilizer were analyzed based on the power spectral density, Allan deviation, and Bode plots. The results indicate that this system can effectively serve as a long-term intensity stabilizer and is ideal for use in laboratories in which PM fibers are widely used, but exact temperature regulation is not feasible.</div></div>","PeriodicalId":11037,"journal":{"name":"Current Applied Physics","volume":"72 ","pages":"Pages 51-55"},"PeriodicalIF":2.4,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143396001","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-06DOI: 10.1016/j.cap.2025.02.003
Hee-Lak Lee , Arif Hussain , Yoon-Jae Moon , Jun Young Hwang , Seung Jae Moon
Pulsed laser ablation can be used in printed electronics to remove silver (Ag) nanoparticle (NP) inks from undesired locations. Removing Ag NP involves a scanning ablation process, in which laser beams are irradiated on spots irradiated by a previous laser beam. In this study, that the heat-affected zone (HAZ), which is the peripheral area of the ablation crater where NPs are not ablated but are affected by heat, greatly influences the ablation aspects. Ablation failure was observed in short laser beam displacements, where the irradiated laser energy per unit length increased. Additional experimental investigation and thermal analysis concluded that property variations, such as increased reflectivity and thermal conductivity, suppressed the temperature increase and made it more difficult for the HAZ and nearby Ag NP to be ablated. Moreover, the ablated lines formed by a higher laser beam fluence and shorter laser beam displacement were not as ablated as the lines formed with a relatively lower laser beam fluence and longer laser beam displacement. Through detailed analysis, we deduced that the local fluence of the second laser beam irradiated on the HAZ was a more critical parameter than the peak fluence of the laser beam. We suggest that in the case of a Gaussian laser beam, the laser beam displacement should be equal to the radius of the ablation crater and HAZ to maximize the local fluence irradiated on the HAZ and minimize the adverse effects of the HAZ. The results can provide a guideline for future manufacturers to perform Ag NP layer ablation while considering the influence of the HAZ.
{"title":"Effect of heat-affected zone on the nanosecond pulsed laser scanning ablation of Ag nanoparticle layer","authors":"Hee-Lak Lee , Arif Hussain , Yoon-Jae Moon , Jun Young Hwang , Seung Jae Moon","doi":"10.1016/j.cap.2025.02.003","DOIUrl":"10.1016/j.cap.2025.02.003","url":null,"abstract":"<div><div>Pulsed laser ablation can be used in printed electronics to remove silver (Ag) nanoparticle (NP) inks from undesired locations. Removing Ag NP involves a scanning ablation process, in which laser beams are irradiated on spots irradiated by a previous laser beam. In this study, that the heat-affected zone (HAZ), which is the peripheral area of the ablation crater where NPs are not ablated but are affected by heat, greatly influences the ablation aspects. Ablation failure was observed in short laser beam displacements, where the irradiated laser energy per unit length increased. Additional experimental investigation and thermal analysis concluded that property variations, such as increased reflectivity and thermal conductivity, suppressed the temperature increase and made it more difficult for the HAZ and nearby Ag NP to be ablated. Moreover, the ablated lines formed by a higher laser beam fluence and shorter laser beam displacement were not as ablated as the lines formed with a relatively lower laser beam fluence and longer laser beam displacement. Through detailed analysis, we deduced that the local fluence of the second laser beam irradiated on the HAZ was a more critical parameter than the peak fluence of the laser beam. We suggest that in the case of a Gaussian laser beam, the laser beam displacement should be equal to the radius of the ablation crater and HAZ to maximize the local fluence irradiated on the HAZ and minimize the adverse effects of the HAZ. The results can provide a guideline for future manufacturers to perform Ag NP layer ablation while considering the influence of the HAZ.</div></div>","PeriodicalId":11037,"journal":{"name":"Current Applied Physics","volume":"72 ","pages":"Pages 65-77"},"PeriodicalIF":2.4,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143403542","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}
Pub Date : 2025-02-05DOI: 10.1016/j.cap.2025.02.001
Srinivasa N. V , Basavaraj Angadi , Mahesh H. M , Srinivas C , Rajganesh M
Metal oxide nanoparticles have been recognized as efficient, environmentally friendly alternatives to currently available materials for various industries, including food, dye, pharmaceutical, chemical, and environmental treatment. Given the extensive use of metal oxide thin films across these fields, the current work reports the successful synthesis of nanocrystalline Sr-doped NiO films using an eco-friendly spray pyrolysis technique for the photocatalytic degradation of Bromophenol Blue pollutant in wastewater treatment. These films were characterized by XRD, Raman, FTIR, FESEM, UV–Vis, and PL techniques. XRD analysis reveals that the crystallite size decreases from 14 nm to 9 nm as the dopant concentration increases. FTIR and Raman analyses identified surface oxygen interstitials and Ni defect-related vibrations. FESEM showed a continuous surface film with spherical polycrystalline morphology. An increase in optical transmittance and bandgap with the incorporation of Sr dopant was observed in the UV–Vis data. A decrease in PL intensity with increasing dopant concentration suggests a suppression of the recombination rate, as indicated by the PL analysis. The photocatalytic activity of the Sr-doped films was evaluated with Bromophenol Blue (BB) under UV–visible irradiation. The 6 % Sr-doped films successfully decomposed 81 % of the BB, demonstrating their effectiveness as catalysts. Additionally, these films exhibited a lower recombination rate, smaller particle size, and higher surface roughness. The 6 % Sr-doped sample showed the highest zones of inhibition, measuring 25 mm and 23 mm for Aspergillus Niger and Penicillium fungi, respectively. Overall, the Sr-doped NiO films were found to be effective in both the degradation of BB and antifungal activity.
{"title":"Investigation of Sr doping on structural, morphological, optical, photocatalytic and antifungal properties of NiO thin films prepared by spray coating technique","authors":"Srinivasa N. V , Basavaraj Angadi , Mahesh H. M , Srinivas C , Rajganesh M","doi":"10.1016/j.cap.2025.02.001","DOIUrl":"10.1016/j.cap.2025.02.001","url":null,"abstract":"<div><div>Metal oxide nanoparticles have been recognized as efficient, environmentally friendly alternatives to currently available materials for various industries, including food, dye, pharmaceutical, chemical, and environmental treatment. Given the extensive use of metal oxide thin films across these fields, the current work reports the successful synthesis of nanocrystalline Sr-doped NiO films using an eco-friendly spray pyrolysis technique for the photocatalytic degradation of Bromophenol Blue pollutant in wastewater treatment. These films were characterized by XRD, Raman, FTIR, FESEM, UV–Vis, and PL techniques. XRD analysis reveals that the crystallite size decreases from 14 nm to 9 nm as the dopant concentration increases. FTIR and Raman analyses identified surface oxygen interstitials and Ni defect-related vibrations. FESEM showed a continuous surface film with spherical polycrystalline morphology. An increase in optical transmittance and bandgap with the incorporation of Sr dopant was observed in the UV–Vis data. A decrease in PL intensity with increasing dopant concentration suggests a suppression of the recombination rate, as indicated by the PL analysis. The photocatalytic activity of the Sr-doped films was evaluated with Bromophenol Blue (BB) under UV–visible irradiation. The 6 % Sr-doped films successfully decomposed 81 % of the BB, demonstrating their effectiveness as catalysts. Additionally, these films exhibited a lower recombination rate, smaller particle size, and higher surface roughness. The 6 % Sr-doped sample showed the highest zones of inhibition, measuring 25 mm and 23 mm for <em>Aspergillus Niger</em> and <em>Penicillium</em> fungi, respectively. Overall, the Sr-doped NiO films were found to be effective in both the degradation of BB and antifungal activity.</div></div>","PeriodicalId":11037,"journal":{"name":"Current Applied Physics","volume":"72 ","pages":"Pages 39-50"},"PeriodicalIF":2.4,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143378509","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}
Pub Date : 2025-02-04DOI: 10.1016/j.cap.2025.02.002
A.V. Prokaznikov , R.V. Selyukov , V.A. Paporkov
Electrical properties of thin W films containing α-W and β-W are studied depending on their thickness, substrate material, phase composition and microstructure. The thickness dependence of phase composition is presented. The theoretical estimations according to quantum mechanical approaches result in good agreement with experimental results for α-W films. The major mechanism of charge carriers scattering in tungsten crystal is the scattering on deformation potential. The thickness dependence of resistivity is investigated experimentally and theoretically, which indicates the dominant contribution of grain-boundary scattering as well as the influence of the interfaces in multilayer structures. The tunneling mechanism is proposed to explain the grain boundary scattering. Transverse magneto-optical Kerr effect indicates the absence of uniaxial symmetry in Co/W system that testifies about the features of tungsten films.
{"title":"Conductivity and magneto-optical response of film structures based on tungsten nanolayers with different phase composition","authors":"A.V. Prokaznikov , R.V. Selyukov , V.A. Paporkov","doi":"10.1016/j.cap.2025.02.002","DOIUrl":"10.1016/j.cap.2025.02.002","url":null,"abstract":"<div><div>Electrical properties of thin W films containing α-W and β-W are studied depending on their thickness, substrate material, phase composition and microstructure. The thickness dependence of phase composition is presented. The theoretical estimations according to quantum mechanical approaches result in good agreement with experimental results for α-W films. The major mechanism of charge carriers scattering in tungsten crystal is the scattering on deformation potential. The thickness dependence of resistivity is investigated experimentally and theoretically, which indicates the dominant contribution of grain-boundary scattering as well as the influence of the interfaces in multilayer structures. The tunneling mechanism is proposed to explain the grain boundary scattering. Transverse magneto-optical Kerr effect indicates the absence of uniaxial symmetry in Co/W system that testifies about the features of tungsten films.</div></div>","PeriodicalId":11037,"journal":{"name":"Current Applied Physics","volume":"72 ","pages":"Pages 78-86"},"PeriodicalIF":2.4,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143419192","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}
Pub Date : 2025-02-04DOI: 10.1016/j.cap.2025.01.011
Keshab Pandey , Yong Gyu Lee , Hae Kyung Jeong
Metal oxides with nanostructures and nickel foam (NF) are evaluated as highly promising electrode materials for supercapacitors, though their performance is required for practical applications. In this study, we synthesized iron oxide nanoparticles from iron nitrate nonahydrate onto NF via a hydrothermal process at a low temperature of 120 °C for a short duration of 6 h. The performance was significantly influenced by optimizing the mass ratio of iron nitrate nonahydrate (0.25, 0.5, and 1 mmol) in terms of charge storage capability, surface area, impedance behavior, and energy density. The optimal loading of 0.5 mmol of iron nitrate nonahydrate on NF-based supercapacitors achieved a specific capacitance of 191.4 F g⁻1 with an energy density of 17.1 Wh Kg⁻1 at 1 A g⁻1. The relatively simple synthesis process and excellent performance of the iron oxide on NF composite highlights its potential as an electrode material for next-generation symmetric supercapacitors.
{"title":"Hydrothermal synthesis of iron oxide grown on nickel foam for supercapacitors","authors":"Keshab Pandey , Yong Gyu Lee , Hae Kyung Jeong","doi":"10.1016/j.cap.2025.01.011","DOIUrl":"10.1016/j.cap.2025.01.011","url":null,"abstract":"<div><div>Metal oxides with nanostructures and nickel foam (NF) are evaluated as highly promising electrode materials for supercapacitors, though their performance is required for practical applications. In this study, we synthesized iron oxide nanoparticles from iron nitrate nonahydrate onto NF via a hydrothermal process at a low temperature of 120 °C for a short duration of 6 h. The performance was significantly influenced by optimizing the mass ratio of iron nitrate nonahydrate (0.25, 0.5, and 1 mmol) in terms of charge storage capability, surface area, impedance behavior, and energy density. The optimal loading of 0.5 mmol of iron nitrate nonahydrate on NF-based supercapacitors achieved a specific capacitance of 191.4 F g⁻<sup>1</sup> with an energy density of 17.1 Wh Kg⁻<sup>1</sup> at 1 A g⁻<sup>1</sup>. The relatively simple synthesis process and excellent performance of the iron oxide on NF composite highlights its potential as an electrode material for next-generation symmetric supercapacitors.</div></div>","PeriodicalId":11037,"journal":{"name":"Current Applied Physics","volume":"72 ","pages":"Pages 56-64"},"PeriodicalIF":2.4,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143396002","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}
Pub Date : 2025-02-03DOI: 10.1016/j.cap.2025.01.017
M.Z. Najihah , M.F. Aizamddin , Farish Irfal Saaid , Tan Winie
In this work, FeCo2O4 (FCO)/polyaniline (PANI) composite has been prepared and its performance in DSSCs has been compared with pristine FCO, PANI and platinum (Pt). X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and high-resolution transmission electron microscopy (HR-TEM) have been employed for the structural and morphological analyses. Contact angle measurement has been performed to examine the contact between electrode and electrolyte. Electrocatalytic effects have been investigated through cyclic voltammetry (CV) and Tafel polarization. Electrochemical impedance spectroscopy (EIS) has been carried out to study the internal resistance and charge transfer kinetics. The FCO exhibits flower-like nanosheets structure whereas the PANI shows irregular coral-reef structure. A similar flower-like morphology is observed in the FCO/PANI composite. The surface of the composite appears to be rough and porous, which improves the electrode-electrolyte contact, as supported from the contact angle measurement. The FCO/PANI composite exhibits the highest electrocatalytic activity and the lowest charge transfer resistance, followed by PANI, FCO and Pt. The efficiencies of DSSCs assembled with FCO, PANI, FCO/PANI and Pt counter electrodes are 4.22, 5.58, 6.38, and 3.58 %, respectively. Superior cell efficiency with FCO/PANI counter electrode is attributed to its rough and porous morphology, greater adherence on the FTO glass and higher I3− reduction rate.
{"title":"Enhanced efficiency of dye-sensitized solar cells (DSSCs) with polyaniline-decorated FeCo2O4 counter electrodes: Synthesis, characterization, and performance analysis","authors":"M.Z. Najihah , M.F. Aizamddin , Farish Irfal Saaid , Tan Winie","doi":"10.1016/j.cap.2025.01.017","DOIUrl":"10.1016/j.cap.2025.01.017","url":null,"abstract":"<div><div>In this work, FeCo<sub>2</sub>O<sub>4</sub> (FCO)/polyaniline (PANI) composite has been prepared and its performance in DSSCs has been compared with pristine FCO, PANI and platinum (Pt). X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and high-resolution transmission electron microscopy (HR-TEM) have been employed for the structural and morphological analyses. Contact angle measurement has been performed to examine the contact between electrode and electrolyte. Electrocatalytic effects have been investigated through cyclic voltammetry (CV) and Tafel polarization. Electrochemical impedance spectroscopy (EIS) has been carried out to study the internal resistance and charge transfer kinetics. The FCO exhibits flower-like nanosheets structure whereas the PANI shows irregular coral-reef structure. A similar flower-like morphology is observed in the FCO/PANI composite. The surface of the composite appears to be rough and porous, which improves the electrode-electrolyte contact, as supported from the contact angle measurement. The FCO/PANI composite exhibits the highest electrocatalytic activity and the lowest charge transfer resistance, followed by PANI, FCO and Pt. The efficiencies of DSSCs assembled with FCO, PANI, FCO/PANI and Pt counter electrodes are 4.22, 5.58, 6.38, and 3.58 %, respectively. Superior cell efficiency with FCO/PANI counter electrode is attributed to its rough and porous morphology, greater adherence on the FTO glass and higher I<sub>3</sub><sup>−</sup> reduction rate.</div></div>","PeriodicalId":11037,"journal":{"name":"Current Applied Physics","volume":"72 ","pages":"Pages 28-38"},"PeriodicalIF":2.4,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143377168","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}
Pub Date : 2025-02-01DOI: 10.1016/j.cap.2024.11.001
Seval Hale Guler , Alican Yakin , Omer Guler , Arun K. Chattopadhyay , Tuncay Simsek
In this study, the traits, production methods, and applications of refractory high-entropy materials—including refractory high-entropy alloys (RHEAs), refractory high-entropy composites (RHE-Cs), and refractory high-entropy ceramics (RHE-Ce)—which are part of the broader category of refractory high-entropy materials with a wide range of applications, have been thoroughly examined and discussed. RHEAs have emerged as materials that exhibit superior properties, such as high melting temperatures, excellent temperature resistance, and high wear and corrosion resilience, in addition to high mechanical and fatigue strength. These attributes have made them extensively studied materials in recent times. The properties of RHEAs suggest their safe operation in challenging environments such as nuclear reactors, gas turbines, aerospace, and energy production. Among refractory materials, RHE-Cs stand out for their high strength and low density, showing significant potential for use in the automotive, aerospace, and space industries. Another group with a wide range of applications, RHE-Ce materials, is distinguished by their high-temperature resilience, high hardness, and low thermal conductivity, making them suitable for high-temperature environments. Refractory materials are generally fabricated using traditional techniques such as arc melting, powder metallurgy, and magnetron sputtering. In this study, along with traditional production methods, additive manufacturing techniques which have revolutionized the manufacturing field are discussed concerning their applications in refractory material production. Additive manufacturing methods enable the achievement of high temperatures and the production of homogeneous, single-phase solid solutions, making them suitable for fabricating refractory materials with high melting points.
{"title":"A critical review of the refractory high-entropy materials: RHEA alloys, composites, ceramics, additively manufactured RHEA alloys","authors":"Seval Hale Guler , Alican Yakin , Omer Guler , Arun K. Chattopadhyay , Tuncay Simsek","doi":"10.1016/j.cap.2024.11.001","DOIUrl":"10.1016/j.cap.2024.11.001","url":null,"abstract":"<div><div>In this study, the traits, production methods, and applications of refractory high-entropy materials—including refractory high-entropy alloys (RHEAs), refractory high-entropy composites (RHE-Cs), and refractory high-entropy ceramics (RHE-Ce)—which are part of the broader category of refractory high-entropy materials with a wide range of applications, have been thoroughly examined and discussed. RHEAs have emerged as materials that exhibit superior properties, such as high melting temperatures, excellent temperature resistance, and high wear and corrosion resilience, in addition to high mechanical and fatigue strength. These attributes have made them extensively studied materials in recent times. The properties of RHEAs suggest their safe operation in challenging environments such as nuclear reactors, gas turbines, aerospace, and energy production. Among refractory materials, RHE-Cs stand out for their high strength and low density, showing significant potential for use in the automotive, aerospace, and space industries. Another group with a wide range of applications, RHE-Ce materials, is distinguished by their high-temperature resilience, high hardness, and low thermal conductivity, making them suitable for high-temperature environments. Refractory materials are generally fabricated using traditional techniques such as arc melting, powder metallurgy, and magnetron sputtering. In this study, along with traditional production methods, additive manufacturing techniques which have revolutionized the manufacturing field are discussed concerning their applications in refractory material production. Additive manufacturing methods enable the achievement of high temperatures and the production of homogeneous, single-phase solid solutions, making them suitable for fabricating refractory materials with high melting points.</div></div>","PeriodicalId":11037,"journal":{"name":"Current Applied Physics","volume":"70 ","pages":"Pages 87-124"},"PeriodicalIF":2.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143167744","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}
Pub Date : 2025-02-01DOI: 10.1016/j.cap.2025.01.016
Yanshu Shi , Mengke Guo , Yiqian Wang , Xuekun Wang , Jile Wang , Xiaoyun Qin , Yumin Song , Hai Wang , Xiaoyan Wang , Tingting Guo
With the rising demand for high-performance organic small-molecule semiconductor materials in optoelectronic devices, reconstructing specific morphologies of nano-phthalocyanines is of great significance. Herein, TiOPc ultrathin nanosheets (UNSs) and nanosheets (NSs) are reconstructed using a simple and effective physical vapor deposition (PVD) method. The thickness and lateral sizes of the UNSs are between 1 to 10 nm and 50–200 nm, respectively. The subsequent experimental results of photodetection exhibited that the photocurrent of UNSs/NSs is nearly four to five orders of magnitude higher than that of the raw materials at 10 V and show good stability. The photoresponsivity of the UNSs is about 3.37 × 104 times that of the raw materials, demonstrating good photoelectric conversion capability. Under different wavelengths, the photocurrents of the UNSs are consistently higher than those of the NSs and the raw materials. The NSs exhibit the fastest response speed, with rise and fall times of 194 ms and 193 ms, respectively, under 395 nm. Furthermore, the photoresponsive properties of the reconstructed UNSs and NSs are better than those of most other reported MPc materials. Our results indicate that TiOPc UNSs and NSs hold great application prospects in high-performance optoelectronic devices.
{"title":"Reconstructed nano-titanyl phthalocyanine for high-performance photodetection","authors":"Yanshu Shi , Mengke Guo , Yiqian Wang , Xuekun Wang , Jile Wang , Xiaoyun Qin , Yumin Song , Hai Wang , Xiaoyan Wang , Tingting Guo","doi":"10.1016/j.cap.2025.01.016","DOIUrl":"10.1016/j.cap.2025.01.016","url":null,"abstract":"<div><div>With the rising demand for high-performance organic small-molecule semiconductor materials in optoelectronic devices, reconstructing specific morphologies of nano-phthalocyanines is of great significance. Herein, TiOPc ultrathin nanosheets (UNSs) and nanosheets (NSs) are reconstructed using a simple and effective physical vapor deposition (PVD) method. The thickness and lateral sizes of the UNSs are between 1 to 10 nm and 50–200 nm, respectively. The subsequent experimental results of photodetection exhibited that the photocurrent of UNSs/NSs is nearly four to five orders of magnitude higher than that of the raw materials at 10 V and show good stability. The photoresponsivity of the UNSs is about 3.37 × 10<sup>4</sup> times that of the raw materials, demonstrating good photoelectric conversion capability. Under different wavelengths, the photocurrents of the UNSs are consistently higher than those of the NSs and the raw materials. The NSs exhibit the fastest response speed, with rise and fall times of 194 ms and 193 ms, respectively, under 395 nm. Furthermore, the photoresponsive properties of the reconstructed UNSs and NSs are better than those of most other reported MPc materials. Our results indicate that TiOPc UNSs and NSs hold great application prospects in high-performance optoelectronic devices.</div></div>","PeriodicalId":11037,"journal":{"name":"Current Applied Physics","volume":"72 ","pages":"Pages 11-17"},"PeriodicalIF":2.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143260827","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}
The utilization of MnO2 as a cathode material in energy storage systems such as rechargeable aqueous zinc-ion batteries shows great promise for development due to its high safety, environmental friendliness, and cost-effectiveness. Nevertheless, the manganese dioxide cathode suffers from a dissolution-redeposition reaction, leading to poor structural stability. To address these issues, this study focuses on modifying the structural properties of δ-MnO2 to overcome its drawbacks, such as low capacity and cycling stability. By synthesizing Ni-δ-MnO2 with enhanced crystalline structure, expanded lattice spacing, improved conductivity, rapid diffusion of Zn2+ ions, and electron transfer are enabled. This results in a notable high capacity of 350 mA h g−1 at 50 mA g−1, accompanied by enduring cycle stability, with the capacity maintained over 200 cycles. The morphology evolution and structure of Ni- δ-MnO2 are believed to enhance ion transportation, rendering it a promising cathode material for applications in aqueous zinc-ion batteries.
{"title":"Impact of Ni on the structure and electrochemical behavior of δ-MnO2 cathodes in zinc ion batteries","authors":"Mohamad Afiefudin , Asep Ridwan Setiawan , Fadli Rohman , Veinardi Suendo , Achmad Prayogi","doi":"10.1016/j.cap.2025.01.014","DOIUrl":"10.1016/j.cap.2025.01.014","url":null,"abstract":"<div><div>The utilization of MnO<sub>2</sub> as a cathode material in energy storage systems such as rechargeable aqueous zinc-ion batteries shows great promise for development due to its high safety, environmental friendliness, and cost-effectiveness. Nevertheless, the manganese dioxide cathode suffers from a dissolution-redeposition reaction, leading to poor structural stability. To address these issues, this study focuses on modifying the structural properties of <em>δ-</em>MnO<sub>2</sub> to overcome its drawbacks, such as low capacity and cycling stability. By synthesizing Ni-<em>δ-</em>MnO<sub>2</sub> with enhanced crystalline structure, expanded lattice spacing, improved conductivity, rapid diffusion of Zn<sup>2+</sup> ions, and electron transfer are enabled. This results in a notable high capacity of 350 mA h g<sup>−1</sup> at 50 mA g<sup>−1</sup>, accompanied by enduring cycle stability, with the capacity maintained over 200 cycles. The morphology evolution and structure of Ni- <em>δ-</em>MnO<sub>2</sub> are believed to enhance ion transportation, rendering it a promising cathode material for applications in aqueous zinc-ion batteries.</div></div>","PeriodicalId":11037,"journal":{"name":"Current Applied Physics","volume":"72 ","pages":"Pages 18-27"},"PeriodicalIF":2.4,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143349577","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}
This research article explains a green synthesis of α-Fe₂O₃ nanoparticles (NPs) utilizing Cedrus deodara wood extract. The wood extract of this medicinal plant was used to synthesize the α-Fe₂O₃ NPs and utilized in various applications including biological applications on Osteosarcoma (MG63) and Lung cancer (A549). Along with this, we have also estimated its anti-bacterial properties on P. aeruginosa bacterial strain. The α-Fe₂O₃ NPs showed high antioxidant activity with DPPH and FRAP values of 86.05 % and 86.04 %, outperforming the antioxidant capacity of Cedrus deodara extract alone (79.16 % and 71.09 %). In cytotoxicity tests, they effectively inhibited osteosarcoma (MG63) and lung carcinoma (A549) cell lines, showing greater cytotoxicity against MG63 cells (IC50 of 19.86 μg/mL) than A549 cells (IC50 of 24.66 μg/mL) after 24 h. They also displayed strong antibacterial activity. This work presents a novel biogenic α-Fe₂O₃ nanoparticle synthesized from Cedrus deodara extract, exhibiting exceptional antioxidant, cytotoxic, and antibacterial activities.
{"title":"Sustainable synthesis of magnetic nanoparticles: Biological applications of Cedrus deodara extract","authors":"Shilpa Kumari , Mohit Sahni , Soumya Pandit , Neha Verma , Firdaus Mohamad Hamzah , Kuldeep Sharma , Kanu Priya","doi":"10.1016/j.cap.2025.01.015","DOIUrl":"10.1016/j.cap.2025.01.015","url":null,"abstract":"<div><div>This research article explains a green synthesis of α-Fe₂O₃ nanoparticles (NPs) utilizing <em>Cedrus deodara</em> wood extract. The wood extract of this medicinal plant was used to synthesize the α-Fe₂O₃ NPs and utilized in various applications including biological applications on Osteosarcoma (MG63) and Lung cancer (A549). Along with this, we have also estimated its anti-bacterial properties on <em>P. aeruginosa</em> bacterial strain. The α-Fe₂O₃ NPs showed high antioxidant activity with DPPH and FRAP values of 86.05 % and 86.04 %, outperforming the antioxidant capacity of <em>Cedrus deodara</em> extract alone (79.16 % and 71.09 %). In cytotoxicity tests, they effectively inhibited osteosarcoma (MG63) and lung carcinoma (A549) cell lines, showing greater cytotoxicity against MG63 cells (IC<sub>50</sub> of 19.86 μg/mL) than A549 cells (IC<sub>50</sub> of 24.66 μg/mL) after 24 h. They also displayed strong antibacterial activity. This work presents a novel biogenic α-Fe₂O₃ nanoparticle synthesized from <em>Cedrus deodara</em> extract, exhibiting exceptional antioxidant, cytotoxic, and antibacterial activities.</div></div>","PeriodicalId":11037,"journal":{"name":"Current Applied Physics","volume":"72 ","pages":"Pages 1-10"},"PeriodicalIF":2.4,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143093097","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}
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