Pub Date : 2024-07-09DOI: 10.1149/2162-8777/ad5c00
Priyadharshini G., D. Geetha, P. S. Ramesh
This study presents the synthesis of a nanocomposite intended to serve as a counter electrode in dye-sensitized solar cells (DSSCs), replacing platinum electrodes, as well as functioning as a nanocatalyst for organic dye degradation. Graphene oxide was synthesized using a modified Hummers method, and cobalt-doped nickel sulfide on graphene oxide (Co-NiS/GO) was prepared via hydrothermal synthesis. The samples underwent characterization through various testing methods. X-ray diffraction analysis revealed a hexagonal structure with a crystallite size of 30 nm. Field-emission scanning electron microscopy/energy-dispersive X-ray images showed a cornflake-like structure, with elements such as cobalt, nickel, sulfur, carbon, and oxygen present. Chemical valence states were confirmed through X-ray photoelectron specteroscopy analysis. The power conversion efficiency of the Co-NiS/GO counter electrode in DSSCs was investigated, with parameters such as open-circuit voltage, short-circuit current density, fill factor, and power conversion efficiency calculated to be 8.6032 mV, 0.5484 mA cm−2, 61, and 2.83%, respectively, based on I-V studies. Furthermore, the developed Co-NiS/GO nanocomposite was assessed for its photo catalytic dye degradation capabilities using malachite green (MG), achieving a degradation rate of approximately 96% within 180 min.
本研究介绍了一种纳米复合材料的合成过程，该材料可用作染料敏化太阳能电池（DSSC）的对电极，取代铂电极，还可用作有机染料降解的纳米催化剂。我们采用改进的 Hummers 法合成了氧化石墨烯，并通过水热合成法制备了氧化石墨烯上的掺钴硫化镍（Co-NiS/GO）。样品通过各种测试方法进行了表征。X 射线衍射分析表明，样品呈六边形结构，晶粒大小为 30 纳米。场发射扫描电子显微镜/能量色散 X 射线图像显示出玉米片状结构，其中含有钴、镍、硫、碳和氧等元素。通过 X 射线光电子能谱分析确认了化学价态。研究了 Co-NiS/GO 对电极在 DSSC 中的功率转换效率，根据 I-V 研究计算，开路电压、短路电流密度、填充因子和功率转换效率等参数分别为 8.6032 mV、0.5484 mA cm-2、61 和 2.83%。此外，还利用孔雀石绿（MG）评估了所开发的 Co-NiS/GO 纳米复合材料的光催化染料降解能力，在 180 分钟内实现了约 96% 的降解率。
{"title":"Nanocomposites of Co-NiS/GO as a Versatile Catalyst: Enabling Platinum-Free DSSC Counter Electrodes and Enhancing Organic Dye Degradation","authors":"Priyadharshini G., D. Geetha, P. S. Ramesh","doi":"10.1149/2162-8777/ad5c00","DOIUrl":"https://doi.org/10.1149/2162-8777/ad5c00","url":null,"abstract":"This study presents the synthesis of a nanocomposite intended to serve as a counter electrode in dye-sensitized solar cells (DSSCs), replacing platinum electrodes, as well as functioning as a nanocatalyst for organic dye degradation. Graphene oxide was synthesized using a modified Hummers method, and cobalt-doped nickel sulfide on graphene oxide (Co-NiS/GO) was prepared via hydrothermal synthesis. The samples underwent characterization through various testing methods. X-ray diffraction analysis revealed a hexagonal structure with a crystallite size of 30 nm. Field-emission scanning electron microscopy/energy-dispersive X-ray images showed a cornflake-like structure, with elements such as cobalt, nickel, sulfur, carbon, and oxygen present. Chemical valence states were confirmed through X-ray photoelectron specteroscopy analysis. The power conversion efficiency of the Co-NiS/GO counter electrode in DSSCs was investigated, with parameters such as open-circuit voltage, short-circuit current density, fill factor, and power conversion efficiency calculated to be 8.6032 mV, 0.5484 mA cm<sup>−2</sup>, 61, and 2.83%, respectively, based on I-V studies. Furthermore, the developed Co-NiS/GO nanocomposite was assessed for its photo catalytic dye degradation capabilities using malachite green (MG), achieving a degradation rate of approximately 96% within 180 min.","PeriodicalId":11496,"journal":{"name":"ECS Journal of Solid State Science and Technology","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141573238","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}
A bidirectional optimization strategy was adopted to fabricate (1-x)(Ba0.975Na0.05)Ti0.99Nb0.01O3)-xBi(Zn0.2Mg0.2Al0.2Sn0.2Zr0.2)O3(abbreviated as (1-x)BNNT-xBZMASZ, x = 0.02–0.10) ceramics, aimed to improve the energy storage performance. X-ray diffraction results revealed that Bi2+ cations entered the A site and the multiple cations occupied the B site of BNNT, thereby decreased the remnant polarization intensity and refined the hysteresis loop. Scanning electron microscopy images showed uniform morphologies with clear grain boundaries of the ceramics, and the average size decreased with x increasing. The substitution of multiple cations at the B-site induced the splitting of macroscopic ferroelectric domains into smaller polar nanodomains, leading to the formation of high-dynamic polar nanoregions and accelerating the transition from BNNT to relaxor ferroelectrics, thus improving relaxation properties of the material. The excellent energy storage density (Wrec ∼ 2.80 J cm−3) and efficiency (∼90.0%) can be obtained under 200 kV cm−1. Moreover, the discharge-charge testing revealed excellent current density (∼589.5 A cm−2), high power density (∼20.63 MW cm−2), and extremely short discharge time (t0.9 ∼ 50.4 ns), along with exceptional temperature stability and cycling stability under the equivalent electric field of 120 kV cm−1. The 0.92BNNT-0.08BZMASZ ceramic offers a new approach to the design and an improvement of pulsed dielectric capacitor materials.
采用双向优化策略制备了(1-x)(Ba0.975Na0.05)Ti0.99Nb0.01O3)-xBi(Zn0.2Mg0.2Al0.2Sn0.2Zr0.2)O3（简称(1-x)BNNT-xBZMASZ，x = 0.02-0.10）陶瓷，旨在提高其储能性能。X 射线衍射结果表明，Bi2+ 阳离子进入了 BNNT 的 A 位，而多个阳离子占据了 B 位，从而降低了残余极化强度，完善了磁滞环。扫描电子显微镜图像显示陶瓷形貌均匀，晶界清晰，平均尺寸随 x 的增加而减小。B 位上多个阳离子的取代诱导了宏观铁电畴分裂成更小的极性纳米域，从而形成了高动态极性纳米区，加速了从 BNNT 向弛豫铁电的转变，从而改善了材料的弛豫特性。在 200 kV cm-1 的电压下，该材料可获得优异的储能密度（Wrec ∼ 2.80 J cm-3）和效率（∼90.0%）。此外，放电-充电测试表明，在 120 kV cm-1 的等效电场下，0.92BNNT-0-NT 晶体具有优异的电流密度（∼589.5 A cm-2）、高功率密度（∼20.63 MW cm-2）和极短的放电时间（t0.9 ∼ 50.4 ns），以及出色的温度稳定性和循环稳定性。0.92BNNT-0.08BZMASZ 陶瓷为脉冲电介质电容器材料的设计和改进提供了一种新方法。
{"title":"Enhancement of Charge-Discharge Properties and Temperature Stability of (Ba0.975Na0.05)Ti0.99Nb0.01O3 Ceramic by Doping High-Entropy Oxide","authors":"Zheng-Xiang Bian, Qing-Qing Liu, Zhi-Wei Li, Zhi-Hui Chen and Yu-Rong Ren","doi":"10.1149/2162-8777/ad5dfa","DOIUrl":"https://doi.org/10.1149/2162-8777/ad5dfa","url":null,"abstract":"A bidirectional optimization strategy was adopted to fabricate (1-x)(Ba0.975Na0.05)Ti0.99Nb0.01O3)-xBi(Zn0.2Mg0.2Al0.2Sn0.2Zr0.2)O3(abbreviated as (1-x)BNNT-xBZMASZ, x = 0.02–0.10) ceramics, aimed to improve the energy storage performance. X-ray diffraction results revealed that Bi2+ cations entered the A site and the multiple cations occupied the B site of BNNT, thereby decreased the remnant polarization intensity and refined the hysteresis loop. Scanning electron microscopy images showed uniform morphologies with clear grain boundaries of the ceramics, and the average size decreased with x increasing. The substitution of multiple cations at the B-site induced the splitting of macroscopic ferroelectric domains into smaller polar nanodomains, leading to the formation of high-dynamic polar nanoregions and accelerating the transition from BNNT to relaxor ferroelectrics, thus improving relaxation properties of the material. The excellent energy storage density (Wrec ∼ 2.80 J cm−3) and efficiency (∼90.0%) can be obtained under 200 kV cm−1. Moreover, the discharge-charge testing revealed excellent current density (∼589.5 A cm−2), high power density (∼20.63 MW cm−2), and extremely short discharge time (t0.9 ∼ 50.4 ns), along with exceptional temperature stability and cycling stability under the equivalent electric field of 120 kV cm−1. The 0.92BNNT-0.08BZMASZ ceramic offers a new approach to the design and an improvement of pulsed dielectric capacitor materials.","PeriodicalId":11496,"journal":{"name":"ECS Journal of Solid State Science and Technology","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141573241","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 : 2024-07-09DOI: 10.1149/2162-8777/ad5dfc
Zein K. Heiba, Noura M. Farag, Asmaa M. Abozied, Ali Badawi and Mohamed Bakr Mohamed
We investigated the influence of CdS on the structural and optical properties of nano ZnWO4 for optical applications. (1−x)ZnWO4/xCdS (x; 0 to 0.25) heterojunctions were formed and the structure and microstructure of the ZnWO4 and CdS phases developed were investigated using Rietveld refinement analysis for synchrotron X-ray diffraction data. Phase analysis revealed the phase percentage of the CdS phase is always less than the nominated value (x), implying merging of some Cd and S into ZnWO4. Raman spectra showed CdS peaks, confirming the existence of CdS. Scanning electron microscopy showed two distinct morphologies: plate-like particles (ZnWO4 phase) and spherical shape (CdS phase). UV–vis diffuse measurements revealed enhancement of absorbance and reduction in reflectance and transmittance, in the range 300–56 nm, as the amount of CdS (x) increased in the (1−x)ZnWO4/xCdS system. Band gap of the ZnWO4 phase reduced from 4.0 eV for x = 0.0 to 3.9, 3.6, and 2.9 eV for x = 0.05, 0.1, and 0.25, respectively. The highest refractive index values were obtained as the amount of CdS reached 0.05. Impact of alloying on linear and nonlinear parameters and emitted photoluminescence spectra was studied. Upon loading ZnWO4 with CdS, the PL intensity is greatly quenched and the whole spectrum is red shifted, from 480 to 540 nm. CIE chromaticity diagrams show that ZnWO4 sample without any doping exhibits a blue color while the doped system reveals green-yellow colors.
{"title":"The Influence of CdS on the Structural and Optical Properties of Nano ZnWO4","authors":"Zein K. Heiba, Noura M. Farag, Asmaa M. Abozied, Ali Badawi and Mohamed Bakr Mohamed","doi":"10.1149/2162-8777/ad5dfc","DOIUrl":"https://doi.org/10.1149/2162-8777/ad5dfc","url":null,"abstract":"We investigated the influence of CdS on the structural and optical properties of nano ZnWO4 for optical applications. (1−x)ZnWO4/xCdS (x; 0 to 0.25) heterojunctions were formed and the structure and microstructure of the ZnWO4 and CdS phases developed were investigated using Rietveld refinement analysis for synchrotron X-ray diffraction data. Phase analysis revealed the phase percentage of the CdS phase is always less than the nominated value (x), implying merging of some Cd and S into ZnWO4. Raman spectra showed CdS peaks, confirming the existence of CdS. Scanning electron microscopy showed two distinct morphologies: plate-like particles (ZnWO4 phase) and spherical shape (CdS phase). UV–vis diffuse measurements revealed enhancement of absorbance and reduction in reflectance and transmittance, in the range 300–56 nm, as the amount of CdS (x) increased in the (1−x)ZnWO4/xCdS system. Band gap of the ZnWO4 phase reduced from 4.0 eV for x = 0.0 to 3.9, 3.6, and 2.9 eV for x = 0.05, 0.1, and 0.25, respectively. The highest refractive index values were obtained as the amount of CdS reached 0.05. Impact of alloying on linear and nonlinear parameters and emitted photoluminescence spectra was studied. Upon loading ZnWO4 with CdS, the PL intensity is greatly quenched and the whole spectrum is red shifted, from 480 to 540 nm. CIE chromaticity diagrams show that ZnWO4 sample without any doping exhibits a blue color while the doped system reveals green-yellow colors.","PeriodicalId":11496,"journal":{"name":"ECS Journal of Solid State Science and Technology","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141584706","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 : 2024-07-08DOI: 10.1149/2162-8777/ad6034
Zhi Gang Lv, wang lishi, Yafei Liu, Xinbin Hu, Z. Bu
Abstract: Dry-type electrochemical polishing (DECP) technology combines the mechanical action of resin particles with the electrochemical action of working solutions to enhance the results of existing treatments. Homogeneous polishing across the entire surface of the piece is the main advantage compared to mechanical polishing. This article utilizes this method to polish the surface of 304 stainless steel, resulting in a metal surface roughness (Ra) in the range of 1.23m to 98nm. This innovation expands the potential applications of 304 stainless steel in the medical and food industries. Energy dispersive X-ray spectroscopy (EDS) analysis cannot detect residual electrolyte components, and resin particles containing liquid electrolytes can effectively avoid the harmful substanc remain on the metal surface. Electrochemical analysis of polished sample shows that the Ecorr was -0.109V for DECP specific sample compared with -0.291V for initial sample, and the polishing process can be seen as the generation and removal of corrosion products.
{"title":"Investigation on the Dry-Type Electrochemical Polishing of 304 Stainless Steel with Ion-Exchange Resin Particles","authors":"Zhi Gang Lv, wang lishi, Yafei Liu, Xinbin Hu, Z. Bu","doi":"10.1149/2162-8777/ad6034","DOIUrl":"https://doi.org/10.1149/2162-8777/ad6034","url":null,"abstract":"\u0000 Abstract: Dry-type electrochemical polishing (DECP) technology combines the mechanical action of resin particles with the electrochemical action of working solutions to enhance the results of existing treatments. Homogeneous polishing across the entire surface of the piece is the main advantage compared to mechanical polishing. This article utilizes this method to polish the surface of 304 stainless steel, resulting in a metal surface roughness (Ra) in the range of 1.23m to 98nm. This innovation expands the potential applications of 304 stainless steel in the medical and food industries. Energy dispersive X-ray spectroscopy (EDS) analysis cannot detect residual electrolyte components, and resin particles containing liquid electrolytes can effectively avoid the harmful substanc remain on the metal surface. Electrochemical analysis of polished sample shows that the Ecorr was -0.109V for DECP specific sample compared with -0.291V for initial sample, and the polishing process can be seen as the generation and removal of corrosion products.","PeriodicalId":11496,"journal":{"name":"ECS Journal of Solid State Science and Technology","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141668911","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 : 2024-07-08DOI: 10.1149/2162-8777/ad6036
Ajeet Gupta, Avneesh Kumar, Surbhi Surbhi, Mudit P. Srivastava, D. Rana
Zinc oxysulfide (ZnOS) nano-thin film has been deposited on a p-type silicon and glass substrate via the hydrothermal deposition method at a temperature of 200ºC. The crystallographic information and morphological analysis of zinc oxysulfide (ZnOS) thin film have been obtained using X-ray diffraction (XRD) patterns and field effect scanning electron microscopy (FESEM). The ZnOS thin film chemical composition was examined using energy-dispersive X-ray spectroscopy (EDX). Ultraviolet-visible (UV-Vis) and photoluminescence (PL) spectroscopy have been utilized for optical analysis. The electrical and electro-optical measurements of ZnOS thin film have been carried out by I-V characteristics in the visible light environment with a power density of 30 mW/cm2. Zinc oxysulfide (ZnOS) thin film was found to be an excellent example of simple responsive photodetection in visible light. The ZnOS thin film has a response time of 1.46 s and a recovery time is equal to 1.32 s. The specific detectivity of the deposited thin film was found to be 3.81×108 Jones. The responsivity of the deposited thin film is found 7.08×102 mA/W. Keywords: Zinc oxysulfide, hydrothermal method, heterojunction, photosensor.
氧化锌（ZnOS）纳米薄膜通过水热沉积法沉积在 p 型硅和玻璃衬底上，沉积温度为 200ºC。利用 X 射线衍射（XRD）图和场效应扫描电子显微镜（FESEM）获得了氧化锌（ZnOS）薄膜的晶体学信息和形态分析。利用能量色散 X 射线光谱（EDX）检测了氧化锌（ZnOS）薄膜的化学成分。紫外-可见（UV-Vis）和光致发光（PL）光谱用于光学分析。在功率密度为 30 mW/cm2 的可见光环境下，通过 I-V 特性对 ZnOS 薄膜进行了电学和电光测量。研究发现，氧化锌（ZnOS）薄膜是在可见光下进行简单响应光检测的极佳范例。ZnOS 薄膜的响应时间为 1.46 秒，恢复时间为 1.32 秒。沉积薄膜的响应率为 7.08×102 mA/W。关键词：氧化锌氧化锌 水热法 异质结 光传感器
{"title":"Facile Growth of Zinc Oxysulfide Nano Thin Film-based Visible Light Photosensor by Hydrothermal Method","authors":"Ajeet Gupta, Avneesh Kumar, Surbhi Surbhi, Mudit P. Srivastava, D. Rana","doi":"10.1149/2162-8777/ad6036","DOIUrl":"https://doi.org/10.1149/2162-8777/ad6036","url":null,"abstract":"\u0000 Zinc oxysulfide (ZnOS) nano-thin film has been deposited on a p-type silicon and glass substrate via the hydrothermal deposition method at a temperature of 200ºC. The crystallographic information and morphological analysis of zinc oxysulfide (ZnOS) thin film have been obtained using X-ray diffraction (XRD) patterns and field effect scanning electron microscopy (FESEM). The ZnOS thin film chemical composition was examined using energy-dispersive X-ray spectroscopy (EDX). Ultraviolet-visible (UV-Vis) and photoluminescence (PL) spectroscopy have been utilized for optical analysis. The electrical and electro-optical measurements of ZnOS thin film have been carried out by I-V characteristics in the visible light environment with a power density of 30 mW/cm2. Zinc oxysulfide (ZnOS) thin film was found to be an excellent example of simple responsive photodetection in visible light. The ZnOS thin film has a response time of 1.46 s and a recovery time is equal to 1.32 s. The specific detectivity of the deposited thin film was found to be 3.81×108 Jones. The responsivity of the deposited thin film is found 7.08×102 mA/W. Keywords: Zinc oxysulfide, hydrothermal method, heterojunction, photosensor.","PeriodicalId":11496,"journal":{"name":"ECS Journal of Solid State Science and Technology","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141667648","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 : 2024-07-08DOI: 10.1149/2162-8777/ad6032
A. Ashery, Samia Gad
We investigated here the electrical properties of the novel structure of PANI-PPy-GO-MWCNTs composite/MnO2/Fe3O4/n-Si. This structure has not been addressed in literature before, the manufacture of this novel structure is carried out using a simple technique. So, we introduce here a novel structure with a simple method of manufacture. The imaginary part of modulus M՝՝ has two behaviors, the first behavior at high and low frequency and the second behavior at mid frequency, so the M՝՝ gives two contrarian behaviors, The M՝՝ is a strong function of frequency and we can change the behavior of M՝՝ by change of frequencies. The Col – Col diagram of modulus has ideal figures at some voltages including two semicircles of grains and grain boundaries. The imaginary part of impedance Z՝՝ versus frequency creates peaks, the peaks shift toward the low frequencies. The novel here the Z՝՝ has positive and negative values, despite the Z՝՝ should have negative values only. The real part of impedance Z՝ keeps on without change at high frequencies and splits for all temperatures at low and mid frequencies. Some electrical properties such as barrier height ɸb,Wd the width of the depletion layer, Nss the density of states,
我们在此研究了 PANI-PPy-GO-MWCNTs 复合材料/MnO2/Fe3O4/n-Si 新型结构的电气性能。这种结构以前从未在文献中出现过，这种新型结构的制造采用了一种简单的技术。因此，我们在此介绍一种制造方法简单的新型结构。模量 M՝՝的虚部有两种行为，第一种行为发生在高频和低频，第二种行为发生在中频，因此 M՝՝有两种相反的行为，M՝՝是频率的强函数，我们可以通过改变频率来改变 M՝՝的行为。模量的 Col - Col 图在某些电压下具有理想的图形，包括晶粒和晶界的两个半圆。阻抗 Z՝՝的虚部与频率的关系产生峰值，峰值向低频移动。尽管 Z՝՝ 应该只有负值，但这里的新颖之处在于 Z՝՝ 有正值和负值。阻抗的实部 Z՝在高频时保持不变，而在中低频时则在所有温度下分裂。一些电气特性，如势垒高度ɸb、耗尽层宽度 Wd 和状态密度 Nss、
{"title":"Investigation of Electrical and Dielectrically Properties of a Novel Structure of PANI-PPy--GO-MWCNTs Composite/MnO2/Fe3O4/n-Si Structure","authors":"A. Ashery, Samia Gad","doi":"10.1149/2162-8777/ad6032","DOIUrl":"https://doi.org/10.1149/2162-8777/ad6032","url":null,"abstract":"\u0000 We investigated here the electrical properties of the novel structure of PANI-PPy-GO-MWCNTs composite/MnO2/Fe3O4/n-Si. This structure has not been addressed in literature before, the manufacture of this novel structure is carried out using a simple technique. So, we introduce here a novel structure with a simple method of manufacture. The imaginary part of modulus M՝՝ has two behaviors, the first behavior at high and low frequency and the second behavior at mid frequency, so the M՝՝ gives two contrarian behaviors, The M՝՝ is a strong function of frequency and we can change the behavior of M՝՝ by change of frequencies. The Col – Col diagram of modulus has ideal figures at some voltages including two semicircles of grains and grain boundaries. The imaginary part of impedance Z՝՝ versus frequency creates peaks, the peaks shift toward the low frequencies. The novel here the Z՝՝ has positive and negative values, despite the Z՝՝ should have negative values only. The real part of impedance Z՝ keeps on without change at high frequencies and splits for all temperatures at low and mid frequencies. Some electrical properties such as barrier height ɸb,Wd the width of the depletion layer, Nss the density of states,","PeriodicalId":11496,"journal":{"name":"ECS Journal of Solid State Science and Technology","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141666855","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}
To improve the surface integrity of ZA27 alloy, a method of chemical mechanical polishing (CMP) considering the galvanic corrosion at the Zn/Al interface is proposed to treat the surface of ZA27 alloy. Firstly, the electrochemical experiment is carried out to study the influence of the pH, H2O2 concentration, and glycine concentration on corrosion potential between zinc and aluminum. Then the Taguchi method integrated with grey relation analysis and fuzzy inference are used to optimize the CMP parameters of ZA27 alloy. Finally, the prediction model of the MRR and surface roughness Ra is established using the mathematical regression analysis method. The experimental results showed that the minimum zinc-aluminum corrosion potential difference is 14 mV when the pH is 10, H2O2 concentration is 1 wt%, and glycine concentration is 0.4 wt%. The optimum CMP parameter is the polishing pressure of 34 kPa, the polishing plate's rotational speed of 70 rpm, and the abrasive particle concentration of 15 wt%. After polishing with the optimum CMP parameter, the MRR is 242 nm/min, and the surface roughness Ra is 13.91 nm. This study demonstrates that the CMP considering the galvanic corrosion at the Zn/Al interface is an effective method for treating ZA27 alloy surface.
{"title":"Experimental Investigation on Chemical Mechanical Polishing of ZA27 Alloy Considering Galvanic Corrosion at Zn/Al Interface","authors":"Changjiang Qin, Jian Pan, Zihua Hu, Kechang Zhang, Rundong Shen, Shengqiang Jiang, Xiaogao Chen, Meijiao Mao","doi":"10.1149/2162-8777/ad6033","DOIUrl":"https://doi.org/10.1149/2162-8777/ad6033","url":null,"abstract":"\u0000 To improve the surface integrity of ZA27 alloy, a method of chemical mechanical polishing (CMP) considering the galvanic corrosion at the Zn/Al interface is proposed to treat the surface of ZA27 alloy. Firstly, the electrochemical experiment is carried out to study the influence of the pH, H2O2 concentration, and glycine concentration on corrosion potential between zinc and aluminum. Then the Taguchi method integrated with grey relation analysis and fuzzy inference are used to optimize the CMP parameters of ZA27 alloy. Finally, the prediction model of the MRR and surface roughness Ra is established using the mathematical regression analysis method. The experimental results showed that the minimum zinc-aluminum corrosion potential difference is 14 mV when the pH is 10, H2O2 concentration is 1 wt%, and glycine concentration is 0.4 wt%. The optimum CMP parameter is the polishing pressure of 34 kPa, the polishing plate's rotational speed of 70 rpm, and the abrasive particle concentration of 15 wt%. After polishing with the optimum CMP parameter, the MRR is 242 nm/min, and the surface roughness Ra is 13.91 nm. This study demonstrates that the CMP considering the galvanic corrosion at the Zn/Al interface is an effective method for treating ZA27 alloy surface.","PeriodicalId":11496,"journal":{"name":"ECS Journal of Solid State Science and Technology","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141668366","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 : 2024-07-08DOI: 10.1149/2162-8777/ad6035
Ramesh Thotakura, P. Usha, K. Ashok, N. Pavan Kumar, Sadhana K, Praveena K
This study focuses on the synthesis and characterization of Mg and Al co-doped M-type Barium hexaferrite (BaMg0.4Al0.4Fe11.2O19) powder via the sol-gel method. Structural analysis using X-ray diffraction (XRD) and Fourier transformation infrared spectroscopy (FTIR) confirmed the single-phase structure of the synthesized powder. Morphological properties were examined through field emission scanning electron microscopy (FESEM), revealing hexagonal particle morphology with an average size of approximately 60 nm for BaMg0.4Al0.4Fe11.2O19. To fabricate composites, commercially purchased SiO2 was used to prepare the composites of (1–x) BaMg0.4Al0.4Fe11.2O19+ (x) SiO2 {where x = 0.0, 0.1, 0.3, 0.5 and 0.7). The composites were prepared using the mixing method followed by microwave sintered at 1000°C/90 min. FESEM and energy-dispersive X-ray spectroscopy (EDS) were employed to analyze the morphology and elemental composition of the composites. The composites ' frequency-dependent complex permittivity was measured over 300 kHz to 3 GHz. Magnetic hysteresis (M-H) loops were used to analyze the magnetic properties of composite samples. A reduction in magnetic saturation was observed with increasing SiO2 concentration, while there was a slight increase in coercivity for the composite samples compared to pure hexaferrite. Coercivity remained relatively unchanged with varying SiO2 concentrations in the composites.
本研究的重点是通过溶胶-凝胶法合成和表征镁和铝共掺杂的 M 型六价钡铁氧体（BaMg0.4Al0.4Fe11.2O19）粉末。利用 X 射线衍射 (XRD) 和傅立叶变换红外光谱 (FTIR) 进行的结构分析证实了合成粉末的单相结构。通过场发射扫描电子显微镜（FESEM）检查了形态学特性，发现 BaMg0.4Al0.4Fe11.2O19 的颗粒形态为六角形，平均粒径约为 60 纳米。为了制备复合材料，我们使用从市场上购买的二氧化硅来制备 (1-x) BaMg0.4Al0.4Fe11.2O19+ (x) SiO2 { 其中 x = 0.0、0.1、0.3、0.5 和 0.7) 的复合材料。复合材料采用混合法制备，然后在 1000°C/90 分钟的温度下进行微波烧结。采用 FESEM 和能量色散 X 射线光谱（EDS）分析了复合材料的形态和元素组成。在 300 kHz 至 3 GHz 的频率范围内测量了复合材料随频率变化的复介电常数。磁滞（M-H）环用于分析复合材料样品的磁性能。随着二氧化硅浓度的增加，磁饱和度降低，而与纯六价铁相比，复合样品的矫顽力略有增加。随着复合材料中二氧化硅浓度的变化，矫顽力保持相对不变。
{"title":"Tunable Magnetic and Dielectric properties of BaMg0.4Al0.4Fe11.2O19 and SiO2 Composites for High-Frequency Applications","authors":"Ramesh Thotakura, P. Usha, K. Ashok, N. Pavan Kumar, Sadhana K, Praveena K","doi":"10.1149/2162-8777/ad6035","DOIUrl":"https://doi.org/10.1149/2162-8777/ad6035","url":null,"abstract":"\u0000 This study focuses on the synthesis and characterization of Mg and Al co-doped M-type Barium hexaferrite (BaMg0.4Al0.4Fe11.2O19) powder via the sol-gel method. Structural analysis using X-ray diffraction (XRD) and Fourier transformation infrared spectroscopy (FTIR) confirmed the single-phase structure of the synthesized powder. Morphological properties were examined through field emission scanning electron microscopy (FESEM), revealing hexagonal particle morphology with an average size of approximately 60 nm for BaMg0.4Al0.4Fe11.2O19. To fabricate composites, commercially purchased SiO2 was used to prepare the composites of (1–x) BaMg0.4Al0.4Fe11.2O19+ (x) SiO2 {where x = 0.0, 0.1, 0.3, 0.5 and 0.7). The composites were prepared using the mixing method followed by microwave sintered at 1000°C/90 min. FESEM and energy-dispersive X-ray spectroscopy (EDS) were employed to analyze the morphology and elemental composition of the composites. The composites ' frequency-dependent complex permittivity was measured over 300 kHz to 3 GHz. Magnetic hysteresis (M-H) loops were used to analyze the magnetic properties of composite samples. A reduction in magnetic saturation was observed with increasing SiO2 concentration, while there was a slight increase in coercivity for the composite samples compared to pure hexaferrite. Coercivity remained relatively unchanged with varying SiO2 concentrations in the composites.","PeriodicalId":11496,"journal":{"name":"ECS Journal of Solid State Science and Technology","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141666732","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 : 2024-07-08DOI: 10.1149/2162-8777/ad5bff
Tejas Chennappa and Sudha D. Kamath
This comprehensive review article discusses the brief history, development, and applications of phosphor-based optical thermometers, which have become increasingly important in various fields due to their ability to measure temperature remotely and with high precision. The article highlights the importance of choosing the suitable phosphor material for a given application, considering factors such as crystal structure and mode of thermometry. It then delves into the structural importance of phosphors, discussing their luminescent properties. The review focuses particularly on fluorescence-based temperature-dependent techniques, including the fluorescence intensity ratio method, which has garnered significant attention due to its straightforward implementation, affordability, and self-referential nature. The article discusses the mathematical formulations underlying this method, including the Boltzmann distribution and the effective lifetime calculation. The review also explores the concept of dual-mode thermometry, which involves the use of multiple luminescent centers to enhance sensitivity and thermal stability. This approach is particularly useful in applications where single-emitter thermometers are vulnerable to variations in excitation intensity or detector stability. The article highlights the advantages, limitations, and future developments of phosphor-based thermometers, including their ability to measure temperature remotely and with high precision. Highlights Suitability of double perovskite phosphors for optical thermometry applications. Double perovskite structure influence on the sensitivities of temperature sensors. Fluorescence intensity ratio method is effective for the interpretation of thermal sensor sensitivities. Phosphors can be used as optical temperature sensors at higher temperatures.
{"title":"Review—Structural and Optical Interpretations on Phosphor-Based Optical Thermometry","authors":"Tejas Chennappa and Sudha D. Kamath","doi":"10.1149/2162-8777/ad5bff","DOIUrl":"https://doi.org/10.1149/2162-8777/ad5bff","url":null,"abstract":"This comprehensive review article discusses the brief history, development, and applications of phosphor-based optical thermometers, which have become increasingly important in various fields due to their ability to measure temperature remotely and with high precision. The article highlights the importance of choosing the suitable phosphor material for a given application, considering factors such as crystal structure and mode of thermometry. It then delves into the structural importance of phosphors, discussing their luminescent properties. The review focuses particularly on fluorescence-based temperature-dependent techniques, including the fluorescence intensity ratio method, which has garnered significant attention due to its straightforward implementation, affordability, and self-referential nature. The article discusses the mathematical formulations underlying this method, including the Boltzmann distribution and the effective lifetime calculation. The review also explores the concept of dual-mode thermometry, which involves the use of multiple luminescent centers to enhance sensitivity and thermal stability. This approach is particularly useful in applications where single-emitter thermometers are vulnerable to variations in excitation intensity or detector stability. The article highlights the advantages, limitations, and future developments of phosphor-based thermometers, including their ability to measure temperature remotely and with high precision. Highlights Suitability of double perovskite phosphors for optical thermometry applications. Double perovskite structure influence on the sensitivities of temperature sensors. Fluorescence intensity ratio method is effective for the interpretation of thermal sensor sensitivities. Phosphors can be used as optical temperature sensors at higher temperatures.","PeriodicalId":11496,"journal":{"name":"ECS Journal of Solid State Science and Technology","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141573237","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 : 2024-07-06DOI: 10.1149/2162-8777/ad5fe4
Mahadevaiyer Krishnan, Donald Capaneri, Sarukkai K Rangarajan
Abstract In this study, the molecular interactions occurring during Chemical Mechanical planarization of Copper in Ferric nitrate – Alumina – Benzotriazole system is investigated. This system is characterized by sudden and dramatic transitions in removal rates when experimental parameters such as downforce and concentrations of the slurry components (Benzotriazole, abrasive, oxidizer) are varied. This behavior is interpreted in terms of the three surface kinetic processes viz. Cu dissolution, film formation and film removal by abrasion, that determine the overall removal rate. A phenomenological model incorporating Frumkin isotherm for the adsorption of Benzotriazole molecules and Langmuir isotherm for the adsorption of surfactants/ions is proposed. Mathematical equations relating the rates of film formation, film removal and metal dissolution to the over all removal rates are derived. The Model is validated by comparing the model predictions with experimental data. The non-linear equations describing the sudden transitions are shown to exhibit a cusp catastrophe when the interaction parameter exceeds a certain value.
{"title":"Molecular interactions in Copper chemical mechanical planarization: A Phenomenological study","authors":"Mahadevaiyer Krishnan, Donald Capaneri, Sarukkai K Rangarajan","doi":"10.1149/2162-8777/ad5fe4","DOIUrl":"https://doi.org/10.1149/2162-8777/ad5fe4","url":null,"abstract":"\u0000 Abstract In this study, the molecular interactions occurring during Chemical Mechanical planarization of Copper in Ferric nitrate – Alumina – Benzotriazole system is investigated. This system is characterized by sudden and dramatic transitions in removal rates when experimental parameters such as downforce and concentrations of the slurry components (Benzotriazole, abrasive, oxidizer) are varied. This behavior is interpreted in terms of the three surface kinetic processes viz. Cu dissolution, film formation and film removal by abrasion, that determine the overall removal rate. A phenomenological model incorporating Frumkin isotherm for the adsorption of Benzotriazole molecules and Langmuir isotherm for the adsorption of surfactants/ions is proposed. Mathematical equations relating the rates of film formation, film removal and metal dissolution to the over all removal rates are derived. The Model is validated by comparing the model predictions with experimental data. The non-linear equations describing the sudden transitions are shown to exhibit a cusp catastrophe when the interaction parameter exceeds a certain value.","PeriodicalId":11496,"journal":{"name":"ECS Journal of Solid State Science and Technology","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141672435","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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