Pub Date : 2024-08-08DOI: 10.1149/2162-8777/ad69c1
Sreenivasa Kumar Godlaveeti, Ammar M. Tighezza, Gopal Naik. B, Subramanyam Pulimi, Rosaiah Pitcheri, Ramamanohar Reddy Nagireddy and Rajababu Chintaparty
This study reports the synthesis of high dielectric constant zirconia oxide (ZrO2) nanorods (NRs) via a co-precipitation method followed by calcination at 700 °C for 2 h. X-ray diffraction (XRD) confirms a mixed-phase composition of orthorhombic and monoclinic structures, while transmission electron microscopy (TEM) reveals distinct nanorods. Energy dispersive X-ray analysis (EDAX) verifies the elemental composition. Photoluminescence (PL) spectroscopy indicates band gap energy of 1.9 eV, aligning better with orthorhombic zirconia. UV–vis analysis suggests oxygen vacancy defects potentially influencing the optical properties due to the nanorod morphology. Importantly, dielectric studies show a high dielectric constant of 29 at 1 MHz, which is approximately four times higher than commercially available ZrO2.
本研究报告通过共沉淀法合成了高介电常数氧化锆（ZrO2）纳米棒（NRs），然后在 700 °C 煅烧 2 小时。X 射线衍射（XRD）证实了正方体和单斜体结构的混合相组成，而透射电子显微镜（TEM）则显示了独特的纳米棒。能量色散 X 射线分析（EDAX）验证了元素组成。光致发光（PL）光谱显示带隙能为 1.9 eV，与正方氧化锆的带隙能更接近。紫外-可见光分析表明，氧空位缺陷可能会影响纳米棒形态的光学特性。重要的是，介电研究显示，1 MHz 时介电常数高达 29，比市面上销售的氧化锆高出约四倍。
{"title":"Synthesis and Characterization of High Dielectric Constant Zirconia Nano-Rods for Advanced Sensors and Energy Storage Applications","authors":"Sreenivasa Kumar Godlaveeti, Ammar M. Tighezza, Gopal Naik. B, Subramanyam Pulimi, Rosaiah Pitcheri, Ramamanohar Reddy Nagireddy and Rajababu Chintaparty","doi":"10.1149/2162-8777/ad69c1","DOIUrl":"https://doi.org/10.1149/2162-8777/ad69c1","url":null,"abstract":"This study reports the synthesis of high dielectric constant zirconia oxide (ZrO2) nanorods (NRs) via a co-precipitation method followed by calcination at 700 °C for 2 h. X-ray diffraction (XRD) confirms a mixed-phase composition of orthorhombic and monoclinic structures, while transmission electron microscopy (TEM) reveals distinct nanorods. Energy dispersive X-ray analysis (EDAX) verifies the elemental composition. Photoluminescence (PL) spectroscopy indicates band gap energy of 1.9 eV, aligning better with orthorhombic zirconia. UV–vis analysis suggests oxygen vacancy defects potentially influencing the optical properties due to the nanorod morphology. Importantly, dielectric studies show a high dielectric constant of 29 at 1 MHz, which is approximately four times higher than commercially available ZrO2.","PeriodicalId":11496,"journal":{"name":"ECS Journal of Solid State Science and Technology","volume":"50 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141945710","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-07DOI: 10.1149/2162-8777/ad69c2
Kurumurthy Talari, K. Chandra Sekar, Boora Srinivas, D. Sreenivasu and Md. Shareefuddin
The effect of Bismuth on zinc-lithium tetra borate glasses were discussed based on structural, physical, and spectroscopic properties. Glass systems of Bi2O3-ZnO-Li2B4O7-TbF3 [BZLT] were cast by melt-quench process. Transparent glasses were analysed by diffracted Roentgen X-rays. Peak free and broad nature X-ray diffraction revealed the amorphous arrangement prevailing in these glasses. Density was estimated using the Archimedes principle. Bismuth grossly affected the density of BZLT glasses by increasing its value 2.722 gm/cc [BZLT-0] to 4.6739 gm/cc [BZLT-40]. Optical absorption provides valuable information about optical band gap energy and Urbach energy and some of its derived physical quantities. The effect of bismuth is felt in decreased Eopt values [3.312 eV in BZLT-0] [2.619 eV in BZLT-40] in BZLT glasses. Bismuth altered the structure of the borate network by forming non-bridging oxygens which in turn reduced the band gap energy by large margin (ΔEopt = 0.693 eV). Fourier transform infrared spectroscpy and Raman studies revealed the presence of several triangular BO3 and tetrahedral BO4 and BiO3 units and also the existence of metal cation vibrations and supported the large deviations in the optical bandgap energies. Election paramagnetic resonance studies support the presence of Tb3+ ions and absence of Tb4+ions in BZLT glasses.
{"title":"Effect of Bismuth on Physical and Spectroscopic Properties of ZnO-Li2B4O7-TbF3 Glasses","authors":"Kurumurthy Talari, K. Chandra Sekar, Boora Srinivas, D. Sreenivasu and Md. Shareefuddin","doi":"10.1149/2162-8777/ad69c2","DOIUrl":"https://doi.org/10.1149/2162-8777/ad69c2","url":null,"abstract":"The effect of Bismuth on zinc-lithium tetra borate glasses were discussed based on structural, physical, and spectroscopic properties. Glass systems of Bi2O3-ZnO-Li2B4O7-TbF3 [BZLT] were cast by melt-quench process. Transparent glasses were analysed by diffracted Roentgen X-rays. Peak free and broad nature X-ray diffraction revealed the amorphous arrangement prevailing in these glasses. Density was estimated using the Archimedes principle. Bismuth grossly affected the density of BZLT glasses by increasing its value 2.722 gm/cc [BZLT-0] to 4.6739 gm/cc [BZLT-40]. Optical absorption provides valuable information about optical band gap energy and Urbach energy and some of its derived physical quantities. The effect of bismuth is felt in decreased Eopt values [3.312 eV in BZLT-0] [2.619 eV in BZLT-40] in BZLT glasses. Bismuth altered the structure of the borate network by forming non-bridging oxygens which in turn reduced the band gap energy by large margin (ΔEopt = 0.693 eV). Fourier transform infrared spectroscpy and Raman studies revealed the presence of several triangular BO3 and tetrahedral BO4 and BiO3 units and also the existence of metal cation vibrations and supported the large deviations in the optical bandgap energies. Election paramagnetic resonance studies support the presence of Tb3+ ions and absence of Tb4+ions in BZLT glasses.","PeriodicalId":11496,"journal":{"name":"ECS Journal of Solid State Science and Technology","volume":"20 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141945788","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-06DOI: 10.1149/2162-8777/ad68a3
Sajini Kalakonda, Rama Sekhara Reddy Dachuru and Krishnaveni Gudela
Y0.85La0.15Fe1−(4/3)xTixO3 (where (x = 0, 0.025, 0.05 and 0.075) nanomaterials were prepared using tartare acid assisted sol-gel method. Various analytical characterization techniques such as X-ray powder diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), UV–vis absorption, Vibrating-sample magnetometer (VSM) and dielectric spectroscopy were employed to characterize the synthesized nanomaterials. Downward shifted of (121) and (002) planes were observed with an increasing of Ti concentration at Fe site through XRD study. The ability of the prepared nano-powders to absorb visible light was demonstrated by the investigation of diffuse reflectance spectra, which showed a decline in bandgap from 2.13 eV to 2.06 eV. XPS studies revealed that Y and La atoms are existed in +3 oxidation state, Fe atom is existed in mixed (+2 and +3) oxidation state and Ti atom is existed in mixed (+3 and +4) oxidation state. The highest magnetization value was observed for x = 0.05 sample through VSM study. High dielectric constant, low dielectric loss and low conductivity values were also observed for Y0.85La0.15Fe1−(4/3)xTixO3 (where (x = 0.05)).
采用酒石酸辅助溶胶-凝胶法制备了 Y0.85La0.15Fe1-(4/3)xTixO3（其中 x = 0、0.025、0.05 和 0.075）纳米材料。合成的纳米材料采用了多种分析表征技术，如 X 射线粉末衍射 (XRD)、扫描电子显微镜 (SEM)、X 射线光电子能谱 (XPS)、紫外-可见吸收、振动样品磁力计 (VSM) 和介电光谱。通过 XRD 研究观察到，随着铁位点上钛浓度的增加，(121) 和 (002) 平面向下移动。通过漫反射光谱的研究，制备的纳米粉体吸收可见光的能力得到了证实，其带隙从 2.13 eV 下降到 2.06 eV。XPS 研究表明，Y 原子和 La 原子处于 +3 氧化态，Fe 原子处于混合（+2 和 +3）氧化态，Ti 原子处于混合（+3 和 +4）氧化态。通过 VSM 研究，x = 0.05 样品的磁化值最高。在 Y0.85La0.15Fe1-(4/3)xTixO3（其中 x = 0.05）中也观察到了高介电常数、低介电损耗和低电导率值。
{"title":"Structural and Magnetic Properties of Y0.85La0.15Fe1−(4/3)xTixO3 (where (x = 0, 0.025, 0.05 and 0.075) Nanomaterials Derived from Sol-Gel Route","authors":"Sajini Kalakonda, Rama Sekhara Reddy Dachuru and Krishnaveni Gudela","doi":"10.1149/2162-8777/ad68a3","DOIUrl":"https://doi.org/10.1149/2162-8777/ad68a3","url":null,"abstract":"Y0.85La0.15Fe1−(4/3)xTixO3 (where (x = 0, 0.025, 0.05 and 0.075) nanomaterials were prepared using tartare acid assisted sol-gel method. Various analytical characterization techniques such as X-ray powder diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), UV–vis absorption, Vibrating-sample magnetometer (VSM) and dielectric spectroscopy were employed to characterize the synthesized nanomaterials. Downward shifted of (121) and (002) planes were observed with an increasing of Ti concentration at Fe site through XRD study. The ability of the prepared nano-powders to absorb visible light was demonstrated by the investigation of diffuse reflectance spectra, which showed a decline in bandgap from 2.13 eV to 2.06 eV. XPS studies revealed that Y and La atoms are existed in +3 oxidation state, Fe atom is existed in mixed (+2 and +3) oxidation state and Ti atom is existed in mixed (+3 and +4) oxidation state. The highest magnetization value was observed for x = 0.05 sample through VSM study. High dielectric constant, low dielectric loss and low conductivity values were also observed for Y0.85La0.15Fe1−(4/3)xTixO3 (where (x = 0.05)).","PeriodicalId":11496,"journal":{"name":"ECS Journal of Solid State Science and Technology","volume":"47 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141945789","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-06DOI: 10.1149/2162-8777/ad6806
Saravanan Pandiaraj, Adham Aleid, Khalid Alhussaini and Abdullah N. Alodhayb
In this work, we present a novel surface plasmon resonance (SPR) sensor for ascorbic acid detection based on a borosilicate crown (BK7) prism coated with a multilayer structure made of ferric oxide (Fe2O3), silver (Ag), and carbon nanotube (CNT). The SPR sensor improves sensitivity and selectivity for ascorbic acid detection by taking advantage of the special optical characteristics of the multilayer construction. The CNT layer offers increased surface area and biocompatibility, and the Ag layer acts as a plasmonic material to promote surface plasmons. The performance of the sensor is improved by the addition of selenium (Se) and Fe2O3 layers, which provide further capabilities like photoconductivity and magnetic manipulation, respectively. Numerical analysis at the operating wavelength of 633 nm is conducted using the transfer matrix approach. For the proposed SPR sensor at room temperature, the performance characteristics, including sensitivity (274.37 degree (°)/RIU), figure of merit (40.60 RIU−1), and detection accuracy (0.189°−1), are computed. The proposed SPR sensor could be very useful in to detect ascorbic acid in the visible range.
{"title":"Ultra-Sensitive and Selective Surface Plasmon Resonance using Ag Metal, Carbon Nanotube, and Selenium Based Biosensors for the Detection of Ascorbic Acid","authors":"Saravanan Pandiaraj, Adham Aleid, Khalid Alhussaini and Abdullah N. Alodhayb","doi":"10.1149/2162-8777/ad6806","DOIUrl":"https://doi.org/10.1149/2162-8777/ad6806","url":null,"abstract":"In this work, we present a novel surface plasmon resonance (SPR) sensor for ascorbic acid detection based on a borosilicate crown (BK7) prism coated with a multilayer structure made of ferric oxide (Fe2O3), silver (Ag), and carbon nanotube (CNT). The SPR sensor improves sensitivity and selectivity for ascorbic acid detection by taking advantage of the special optical characteristics of the multilayer construction. The CNT layer offers increased surface area and biocompatibility, and the Ag layer acts as a plasmonic material to promote surface plasmons. The performance of the sensor is improved by the addition of selenium (Se) and Fe2O3 layers, which provide further capabilities like photoconductivity and magnetic manipulation, respectively. Numerical analysis at the operating wavelength of 633 nm is conducted using the transfer matrix approach. For the proposed SPR sensor at room temperature, the performance characteristics, including sensitivity (274.37 degree (°)/RIU), figure of merit (40.60 RIU−1), and detection accuracy (0.189°−1), are computed. The proposed SPR sensor could be very useful in to detect ascorbic acid in the visible range.","PeriodicalId":11496,"journal":{"name":"ECS Journal of Solid State Science and Technology","volume":"27 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141945711","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This study explores the impact of doping with Ho, Gd, and La on sol-gel-derived nickel ferrites through a comprehensive analysis using various analytical techniques. The combination of X-ray diffraction (XRD) analysis, X-ray fluorescence (XRF) spectra analysis, impedance spectroscopy, and I-V analysis enables a detailed exploration of the structural, compositional, and electrical characteristics of the samples. Williamson-Hall plots in XRD analysis reveal crucial insights into grain and grain boundary impacts, revealing a shift in trends for doped samples indicative of tensile strain and underscores the influence of dopant ions on lattice distortion. XRF study confirms the elemental composition of the samples, validating the experimental approach. Impedance spectroscopy sheds light on conduction mechanisms and charge transfer processes, while the modulus study identifies distinct relaxation peaks corresponding to grain and grain boundary relaxation mechanisms. IV analysis demonstrates a significant reduction in leakage current with rare Earth element doping, suggesting promising applications.
本研究通过使用各种分析技术进行综合分析，探讨了掺杂 Ho、Gd 和 La 对溶胶凝胶衍生镍铁氧体的影响。结合 X 射线衍射 (XRD) 分析、X 射线荧光 (XRF) 光谱分析、阻抗光谱分析和 I-V 分析，可以详细探讨样品的结构、成分和电气特性。XRD 分析中的 Williamson-Hall 图揭示了对晶粒和晶界影响的重要见解，揭示了掺杂样品的趋势变化，表明了拉伸应变，并强调了掺杂离子对晶格畸变的影响。XRF 研究证实了样品的元素组成，验证了实验方法。阻抗光谱分析揭示了传导机制和电荷转移过程，而模量研究则确定了与晶粒和晶界弛豫机制相对应的不同弛豫峰。IV 分析表明，稀土元素掺杂可显著降低漏电流，表明其应用前景广阔。
{"title":"Influence of Ho, Gd, La Doping on Grain-Grain Boundary Characteristics and Minimization of Leakage Current in Nickel Ferrites","authors":"Sanchit Kumar, Chaitali Mondal, Abhigyan Dutta, Ankurava Sinha","doi":"10.1149/2162-8777/ad6503","DOIUrl":"https://doi.org/10.1149/2162-8777/ad6503","url":null,"abstract":"This study explores the impact of doping with Ho, Gd, and La on sol-gel-derived nickel ferrites through a comprehensive analysis using various analytical techniques. The combination of X-ray diffraction (XRD) analysis, X-ray fluorescence (XRF) spectra analysis, impedance spectroscopy, and I-V analysis enables a detailed exploration of the structural, compositional, and electrical characteristics of the samples. Williamson-Hall plots in XRD analysis reveal crucial insights into grain and grain boundary impacts, revealing a shift in trends for doped samples indicative of tensile strain and underscores the influence of dopant ions on lattice distortion. XRF study confirms the elemental composition of the samples, validating the experimental approach. Impedance spectroscopy sheds light on conduction mechanisms and charge transfer processes, while the modulus study identifies distinct relaxation peaks corresponding to grain and grain boundary relaxation mechanisms. IV analysis demonstrates a significant reduction in leakage current with rare Earth element doping, suggesting promising applications.","PeriodicalId":11496,"journal":{"name":"ECS Journal of Solid State Science and Technology","volume":"74 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141872380","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-25DOI: 10.1149/2162-8777/ad6504
Nand Kishore Yadav, Damodar Reddy K., Swathi D., Nagaraju R., Sowjanya P., Prasanna Kumari K. N., Kumar Swamy N., Ramesh T. and Pavan Kumar N.
Using the traditional solid-state reaction approach, multiferroic ceramics with the compositional formula Yb1−xHoxMnO3, where x = 0 to 0.4 with 0.1 variation were synthesized. The structural and magnetic properties of the prepared poly-crystalline samples Yb1−xHoxMnO3 were investigated to show the effect of higher magnetic moment Ho3+ ion over the Yb ion. X-ray diffraction was used to analyze the compound’s crystal structure and confirm that they have a hexagonal single-phase structure with a P63cm space group. The presence of functional groups and their shifting to lower frequency regions were revealed by Fourier-transform infrared spectroscopy. UV–vis absorbance spectra were used to calculate the energy gap values, and the resultant data shows a decrease in band gap values with an increase in Ho3+ doping. Crystal deformation with the doping of Ho3+ was observed using Raman spectra. Room-temperature magnetic studies were used to reveal the paramagnetic nature of the samples and the increase in magnetic parameters due to the doping of the higher magnetic moment Ho3+ ion.
{"title":"Effect of Ho3+ Doping on Structural and Magnetic Properties of Multiferroic YbMnO3","authors":"Nand Kishore Yadav, Damodar Reddy K., Swathi D., Nagaraju R., Sowjanya P., Prasanna Kumari K. N., Kumar Swamy N., Ramesh T. and Pavan Kumar N.","doi":"10.1149/2162-8777/ad6504","DOIUrl":"https://doi.org/10.1149/2162-8777/ad6504","url":null,"abstract":"Using the traditional solid-state reaction approach, multiferroic ceramics with the compositional formula Yb1−xHoxMnO3, where x = 0 to 0.4 with 0.1 variation were synthesized. The structural and magnetic properties of the prepared poly-crystalline samples Yb1−xHoxMnO3 were investigated to show the effect of higher magnetic moment Ho3+ ion over the Yb ion. X-ray diffraction was used to analyze the compound’s crystal structure and confirm that they have a hexagonal single-phase structure with a P63cm space group. The presence of functional groups and their shifting to lower frequency regions were revealed by Fourier-transform infrared spectroscopy. UV–vis absorbance spectra were used to calculate the energy gap values, and the resultant data shows a decrease in band gap values with an increase in Ho3+ doping. Crystal deformation with the doping of Ho3+ was observed using Raman spectra. Room-temperature magnetic studies were used to reveal the paramagnetic nature of the samples and the increase in magnetic parameters due to the doping of the higher magnetic moment Ho3+ ion.","PeriodicalId":11496,"journal":{"name":"ECS Journal of Solid State Science and Technology","volume":"19 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141784018","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-25DOI: 10.1149/2162-8777/ad6506
A. M. El-Naggar, Zein K. Heiba, A. M. Kamal, R. M. Ibrahim and Mohamed Bakr Mohamed
Poly (methyl methacrylate, PMMA)/ multi-walled carbon nanotubes (MWCNTs)/ x wt %zinc manganite (ZnMn2O4) polymers were fabricated using co-precipitation and casting techniques. The structure of the filler and all polymers was determined with X-ray diffraction. The morphology of the polymer surfaces was explored by employing scanning electron microscopy. The direct and indirect band gap energies (Eg) of PMMA polymer (5.02, 4.44) eV decreased attaining minimum values (4.97, 3.41) eV upon the addition of MWCNTs and 2 wt% ZnMn2O4. The refractive index at 600 nm was increased from 1.33 (PMMA) to 1.55 (x = 2 wt% ZnMn2O4). The optical dielectric constant and optical conductivity displayed their highest values when the ZnMn2O4 doping level reached 2 wt%. The PMMA/MWCNTs/x wt% ZnMn2O4 polymers exhibited blue-violet colors on the CIE 1931 chromaticity diagram under excitation wavelength of 317 nm. The electrical dielectric constant and the AC conductivity attained their peak at the concentration of 2 wt% and 1 wt% ZnMn2O4, respectively. PMMA/MWCNTs/x wt% ZnMn2O4 polymers possess controllable optical and electrical characteristics, thus making them potentially valuable optical materials for future optoelectronic or photocatalytic application development.
{"title":"Influence of Zinc Manganite Nano Fillers on the Optical and Dielectric Features of Poly-Methyl Methacrylate/Multi-Walled Carbon Nanotubes Nanocomposites","authors":"A. M. El-Naggar, Zein K. Heiba, A. M. Kamal, R. M. Ibrahim and Mohamed Bakr Mohamed","doi":"10.1149/2162-8777/ad6506","DOIUrl":"https://doi.org/10.1149/2162-8777/ad6506","url":null,"abstract":"Poly (methyl methacrylate, PMMA)/ multi-walled carbon nanotubes (MWCNTs)/ x wt %zinc manganite (ZnMn2O4) polymers were fabricated using co-precipitation and casting techniques. The structure of the filler and all polymers was determined with X-ray diffraction. The morphology of the polymer surfaces was explored by employing scanning electron microscopy. The direct and indirect band gap energies (Eg) of PMMA polymer (5.02, 4.44) eV decreased attaining minimum values (4.97, 3.41) eV upon the addition of MWCNTs and 2 wt% ZnMn2O4. The refractive index at 600 nm was increased from 1.33 (PMMA) to 1.55 (x = 2 wt% ZnMn2O4). The optical dielectric constant and optical conductivity displayed their highest values when the ZnMn2O4 doping level reached 2 wt%. The PMMA/MWCNTs/x wt% ZnMn2O4 polymers exhibited blue-violet colors on the CIE 1931 chromaticity diagram under excitation wavelength of 317 nm. The electrical dielectric constant and the AC conductivity attained their peak at the concentration of 2 wt% and 1 wt% ZnMn2O4, respectively. PMMA/MWCNTs/x wt% ZnMn2O4 polymers possess controllable optical and electrical characteristics, thus making them potentially valuable optical materials for future optoelectronic or photocatalytic application development.","PeriodicalId":11496,"journal":{"name":"ECS Journal of Solid State Science and Technology","volume":"23 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141784019","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-18DOI: 10.1149/2162-8777/ad5b88
Fahad I. Danladi, Abhishek Rawat, Abhishek Kumar Adak, Chuzhong Zhang, Vinod K. Sangwan, Riddhi Ananth, Mark C. Hersam, Efstathios I. Meletis and Krishnan Rajeshwar
Unlike the well-studied and technologically advanced Group III-V and Group II-VI compound semiconductor alloys, alloys of ternary metal oxide semiconductors have only recently begun to receive widespread attention. Here, we describe the effect of alkaline earth metal substitution on the optical, electronic, and photoelectrochemical (PEC) properties of copper metavanadate (CuV2O6). As a host, the Cu-V-O compound family presents a versatile framework to develop such composition-property correlations. Alloy compositions of A0.1Cu0.9V2O6 (A = Mg, Ca) photoanodes were synthesized via a time and energy-efficient solution combustion synthesis (SCS) method. The effect of introducing alkaline earth metals (Mg, Ca) on the crystal structure, microstructure, electronic, and optical properties of copper metavanadates was investigated by powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), diffuse reflectance spectroscopy (DRS), transmission electron microscopy (TEM), and Raman spectroscopy. The PXRD, TEM, and Raman spectroscopy data demonstrated the polycrystalline powder samples to be mutually soluble, solid solutions of copper and alkaline earth metal metavanadates and not simple mixtures of these compounds. The DRS data showed a systematic decrease in the optical bandgap with Cu incorporation. These trends were corroborated by electronic band structure calculations. Finally, the PEC properties exhibited a strong dependence on the alloy composition, pointing to possible applicability in solar water splitting, heterogeneous photocatalysis, phosphor lighting/displays, and photovoltaic devices.
{"title":"Synthesis and Tuning of Electronic, Optical, and Photoelectrochemical Properties of Copper Metavanadate Alloys via Alkaline Earth Metal Substitution","authors":"Fahad I. Danladi, Abhishek Rawat, Abhishek Kumar Adak, Chuzhong Zhang, Vinod K. Sangwan, Riddhi Ananth, Mark C. Hersam, Efstathios I. Meletis and Krishnan Rajeshwar","doi":"10.1149/2162-8777/ad5b88","DOIUrl":"https://doi.org/10.1149/2162-8777/ad5b88","url":null,"abstract":"Unlike the well-studied and technologically advanced Group III-V and Group II-VI compound semiconductor alloys, alloys of ternary metal oxide semiconductors have only recently begun to receive widespread attention. Here, we describe the effect of alkaline earth metal substitution on the optical, electronic, and photoelectrochemical (PEC) properties of copper metavanadate (CuV2O6). As a host, the Cu-V-O compound family presents a versatile framework to develop such composition-property correlations. Alloy compositions of A0.1Cu0.9V2O6 (A = Mg, Ca) photoanodes were synthesized via a time and energy-efficient solution combustion synthesis (SCS) method. The effect of introducing alkaline earth metals (Mg, Ca) on the crystal structure, microstructure, electronic, and optical properties of copper metavanadates was investigated by powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), diffuse reflectance spectroscopy (DRS), transmission electron microscopy (TEM), and Raman spectroscopy. The PXRD, TEM, and Raman spectroscopy data demonstrated the polycrystalline powder samples to be mutually soluble, solid solutions of copper and alkaline earth metal metavanadates and not simple mixtures of these compounds. The DRS data showed a systematic decrease in the optical bandgap with Cu incorporation. These trends were corroborated by electronic band structure calculations. Finally, the PEC properties exhibited a strong dependence on the alloy composition, pointing to possible applicability in solar water splitting, heterogeneous photocatalysis, phosphor lighting/displays, and photovoltaic devices.","PeriodicalId":11496,"journal":{"name":"ECS Journal of Solid State Science and Technology","volume":"18 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141738252","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-18DOI: 10.1149/2162-8777/ad60ff
Yangyang Guo, Jing Sun, Cheng Wang, Yanni Yang and Junjie Wang
The atomic force microscope (AFM) has been widely used for fabricating the nanoscale oxide ribbons on various materials surface. Herein, we first conducted local anodic oxidation (LAO) lithography on two-dimensional nanomaterial (2D), i.e. multilayer MoS2, using AFM. The correlation of patterning behavior on the MoS2 flakes between the lithography conditions was investigated. The height and full width half maximum (FWHM) increase linearly with increasing tip voltage, even at different tip speeds, which is consistent with the results obtained from the Cabrera-Mott oxidation theory. The size of the clear relation decreases linearly with increasing tip speed, indicating that longer tip writing patterns result in more oxidation. The formation mechanism of the patterned oxide lines is presented along with LAO reaction processes.The final LAO lithography products have been demonstrated to be MoO2 and MoO3 by micro-Raman spectroscopy. These results show that LAO lithography using AFM is an effective technique for nanofabrication of nanodevices.
{"title":"Creation and Characterization of Nanoscale Ribbons on MoS2 by Atomic Force Microscope Nanolithography","authors":"Yangyang Guo, Jing Sun, Cheng Wang, Yanni Yang and Junjie Wang","doi":"10.1149/2162-8777/ad60ff","DOIUrl":"https://doi.org/10.1149/2162-8777/ad60ff","url":null,"abstract":"The atomic force microscope (AFM) has been widely used for fabricating the nanoscale oxide ribbons on various materials surface. Herein, we first conducted local anodic oxidation (LAO) lithography on two-dimensional nanomaterial (2D), i.e. multilayer MoS2, using AFM. The correlation of patterning behavior on the MoS2 flakes between the lithography conditions was investigated. The height and full width half maximum (FWHM) increase linearly with increasing tip voltage, even at different tip speeds, which is consistent with the results obtained from the Cabrera-Mott oxidation theory. The size of the clear relation decreases linearly with increasing tip speed, indicating that longer tip writing patterns result in more oxidation. The formation mechanism of the patterned oxide lines is presented along with LAO reaction processes.The final LAO lithography products have been demonstrated to be MoO2 and MoO3 by micro-Raman spectroscopy. These results show that LAO lithography using AFM is an effective technique for nanofabrication of nanodevices.","PeriodicalId":11496,"journal":{"name":"ECS Journal of Solid State Science and Technology","volume":"45 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141738343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-16DOI: 10.1149/2162-8777/ad5fb8
Manal M. Alkhamisi
In this work, ZnSnO3 (ZTO3) and Li-doped ZTO3 thin films were synthesized on glass slides by a cost-effective nebulizer spray pyrolysis procedure. The X-ray diffraction analysis revealed that the ZTO3 and Li-doped ZTO3 thin films possessed a rhombohedral structure. The structural indices (grain size, dislocation density, lattice strain) of the ZTO3 and Li-doped ZTO3 thin films were computed. The morphology characteristics of the ZTO3 and Li-doped ZTO3 thin films were observed by field emission scanning electron microscopy. The inspected films display uniform and homogeneous surfaces. The optical transmittance, T, and reflectance, R, of the ZTO3 and Li-doped ZTO3 thin films were recorded using a double-beam spectrophotometer to investigate the optical characteristics of these layers. The refractive index of the ZTO3 and Li-doped ZTO3 thin films was enhanced via the Li content increase. Moreover, Tauc’s plots demonstrated that the energy gap of the ZTO3 and Li-doped ZTO3 thin films was reduced from 3.85 eV to 3.08 eV by boosting the Li doping content. Moreover, the increase in Li content produces an enhancement in the optoelectrical indices (optical resistivity, optical carrier concentration, optical mobility, plasms frequency, and optical conductivity) of the ZTO3 and Li-doped ZTO3 thin films. The nonlinear optical indices of the ZTO3 and Li-doped ZTO3 thin films were deduced, and it was noted that Li content boosted the nonlinear optical indices of these layers. All the ZTO3 and Li-doped ZTO3 thin films displayed n-type semiconducting properties by the hot probe equipment.
{"title":"Effect of Li Doping on Structural, Optical, and Optoelectrical Characteristics of ZnSnO3 Thin Films Prepared by Nebulizer Spray Pyrolysis","authors":"Manal M. Alkhamisi","doi":"10.1149/2162-8777/ad5fb8","DOIUrl":"https://doi.org/10.1149/2162-8777/ad5fb8","url":null,"abstract":"In this work, ZnSnO3 (ZTO3) and Li-doped ZTO3 thin films were synthesized on glass slides by a cost-effective nebulizer spray pyrolysis procedure. The X-ray diffraction analysis revealed that the ZTO3 and Li-doped ZTO3 thin films possessed a rhombohedral structure. The structural indices (grain size, dislocation density, lattice strain) of the ZTO3 and Li-doped ZTO3 thin films were computed. The morphology characteristics of the ZTO3 and Li-doped ZTO3 thin films were observed by field emission scanning electron microscopy. The inspected films display uniform and homogeneous surfaces. The optical transmittance, T, and reflectance, R, of the ZTO3 and Li-doped ZTO3 thin films were recorded using a double-beam spectrophotometer to investigate the optical characteristics of these layers. The refractive index of the ZTO3 and Li-doped ZTO3 thin films was enhanced via the Li content increase. Moreover, Tauc’s plots demonstrated that the energy gap of the ZTO3 and Li-doped ZTO3 thin films was reduced from 3.85 eV to 3.08 eV by boosting the Li doping content. Moreover, the increase in Li content produces an enhancement in the optoelectrical indices (optical resistivity, optical carrier concentration, optical mobility, plasms frequency, and optical conductivity) of the ZTO3 and Li-doped ZTO3 thin films. The nonlinear optical indices of the ZTO3 and Li-doped ZTO3 thin films were deduced, and it was noted that Li content boosted the nonlinear optical indices of these layers. All the ZTO3 and Li-doped ZTO3 thin films displayed n-type semiconducting properties by the hot probe equipment.","PeriodicalId":11496,"journal":{"name":"ECS Journal of Solid State Science and Technology","volume":"20 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141738344","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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