Pub Date : 2024-06-06DOI: 10.15251/djnb.2024.192.773
Y. Hordieiev, A. Zaichuk
Employing the melt quenching method, new bismuth borate glass compositions denoted as (40+x)Bi2O3–(60-x-y)B2O3–ySrO, with x and y ranging between 0 to 20 mol%, were synthesized. The X-ray Diffraction analyses confirmed the amorphous nature of all glass samples, indicating the absence of long-range order typically seen in crystalline materials. Concurrently, the Fourier-transform Infrared Spectroscopy examinations unveiled the existence of fundamental structural units within the glasses, including BO3 and BO4 trigonal and tetrahedral units, as well as BiO3 and BiO6 polyhedra, suggesting a complex network structure. Differential Thermal Analysis (DTA) and dilatometry assessed the glasses' thermal properties. DTA demonstrated the glasses' high thermal stability, with a stability value of up to 106°C, noting that stability improves with more SrO. Dilatometry analyses revealed these glasses exhibit a high thermal expansion coefficient, ranging from 8.69 to 10.7 ppm/°C, alongside relatively low glass transition temperatures between 362 and 432°C and dilatometric softening temperatures spanning from 380 to 447°C. Density measurements were conducted, followed by molar volume and oxygen packing density calculations, to glean further insights into the samples. Compared to other heavy-metal oxide glasses, the glasses examined in this study exhibited notably high-density values, ranging between 6.279 and 7.476 g/cm3 .
{"title":"Preparation and characterization of strontium-doped bismuth borate glasses","authors":"Y. Hordieiev, A. Zaichuk","doi":"10.15251/djnb.2024.192.773","DOIUrl":"https://doi.org/10.15251/djnb.2024.192.773","url":null,"abstract":"Employing the melt quenching method, new bismuth borate glass compositions denoted as (40+x)Bi2O3–(60-x-y)B2O3–ySrO, with x and y ranging between 0 to 20 mol%, were synthesized. The X-ray Diffraction analyses confirmed the amorphous nature of all glass samples, indicating the absence of long-range order typically seen in crystalline materials. Concurrently, the Fourier-transform Infrared Spectroscopy examinations unveiled the existence of fundamental structural units within the glasses, including BO3 and BO4 trigonal and tetrahedral units, as well as BiO3 and BiO6 polyhedra, suggesting a complex network structure. Differential Thermal Analysis (DTA) and dilatometry assessed the glasses' thermal properties. DTA demonstrated the glasses' high thermal stability, with a stability value of up to 106°C, noting that stability improves with more SrO. Dilatometry analyses revealed these glasses exhibit a high thermal expansion coefficient, ranging from 8.69 to 10.7 ppm/°C, alongside relatively low glass transition temperatures between 362 and 432°C and dilatometric softening temperatures spanning from 380 to 447°C. Density measurements were conducted, followed by molar volume and oxygen packing density calculations, to glean further insights into the samples. Compared to other heavy-metal oxide glasses, the glasses examined in this study exhibited notably high-density values, ranging between 6.279 and 7.476 g/cm3 .","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141376999","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 : 2024-06-06DOI: 10.15251/djnb.2024.192.785
F. M. Wang, Y. L. Li, C. L. Yan
BaCO3, SnO2 and TiO2 et al were used as crude materials, and Y2O3 was used as dopant, BaSnxTi1-xO3 (BTS) ceramics were prepared by solid-state reaction sintering technology. The results show that the doping of Y element does not change the lattice structure of barium tin titanate obviously, and there is no new phase, however, owing to the Y3+ ion doping, the diffraction peak position is changed as the Y3+ doping amount increasing. Interestingly, Curie temperature of the sample increased from 35 o C (blank sample) to 50 o C (0.05 mol%), and then the Curie temperature moved to low temperature as the doping amount increased continuously, which is related to the doping mechanism of Y3+ ion. After doping Y2O3, the dielectric loss of the samples decreases, especially when the doping amount reaches 0.10 mol%, the specimen shows excellent temperature stability of dielectric loss, making it superior candidates for applications.
以BaCO3、SnO2和TiO2等为粗料，以Y2O3为掺杂剂，采用固态反应烧结技术制备了BaSnxTi1-xO3（BTS）陶瓷。结果表明，Y 元素的掺入并没有明显改变钛酸钡锡的晶格结构，也没有出现新的相，但由于 Y3+ 离子的掺入，随着 Y3+ 掺入量的增加，衍射峰的位置发生了变化。有趣的是，样品的居里温度从 35 o C（空白样品）升高到 50 o C（0.05 mol%），然后随着掺杂量的不断增加，居里温度向低温移动，这与 Y3+ 离子的掺杂机理有关。掺杂 Y2O3 后，样品的介电损耗降低，特别是当掺杂量达到 0.10 mol% 时，样品的介电损耗表现出优异的温度稳定性，使其成为应用的上佳候选材料。
{"title":"Microstructure, dielectric properties and phase transition of Y2O3-doped barium tin titanate ceramics","authors":"F. M. Wang, Y. L. Li, C. L. Yan","doi":"10.15251/djnb.2024.192.785","DOIUrl":"https://doi.org/10.15251/djnb.2024.192.785","url":null,"abstract":"BaCO3, SnO2 and TiO2 et al were used as crude materials, and Y2O3 was used as dopant, BaSnxTi1-xO3 (BTS) ceramics were prepared by solid-state reaction sintering technology. The results show that the doping of Y element does not change the lattice structure of barium tin titanate obviously, and there is no new phase, however, owing to the Y3+ ion doping, the diffraction peak position is changed as the Y3+ doping amount increasing. Interestingly, Curie temperature of the sample increased from 35 o C (blank sample) to 50 o C (0.05 mol%), and then the Curie temperature moved to low temperature as the doping amount increased continuously, which is related to the doping mechanism of Y3+ ion. After doping Y2O3, the dielectric loss of the samples decreases, especially when the doping amount reaches 0.10 mol%, the specimen shows excellent temperature stability of dielectric loss, making it superior candidates for applications.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141381197","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 : 2024-06-06DOI: 10.15251/djnb.2024.192.793
M. F. Allawai, M. S. Sada, A. M. Jabbar, K. N. Hussein, N. Habubi, S. Chiad, M. Jadan
Thin films of zinc oxide and (ZnO:Mn) with 1% and 3% concentrations were created at 400 °C by spray pyrolysis. According to X-ray diffraction (XRD) investigation, ZnO films are polycrystalline and have a cubic structure with a distinct peak in one direction (101). The grain size increases as manganese content rise, from 12.66 nm to 14.66 nm. While the strain (ε) for ZnO reduced after manganese doping, it decreased from 27.36 to 23.63. Surface topography and nanostructure study reveal that as the manganese (Mn) content of ZnO films increased, cluster grain size, average roughness, and root mean square roughness (Rrms) all significantly reduced. SEM images show substantial morphological changes from flat islands to spherical nano-grains post-manganese via Mn content. The average transmittance was >70% in the visible area for Undoped ZnO and 1, 3% Manganese doping optical transmittance demonstrates exceptional optical transparency. When doping levels are increased by 1% or 3%, the absorption coefficient rises. The optical band gap widens in ZnO: Mn film for allowed direct transition has been decreased from (3.32 to 3.21) eV. Results illustrate that the films' refractive index and extinction coefficient decreases with increasing Mn Doped. Hydrogen gas decreases resistance in ZnO films, suggesting p-type behavior. Doping with 3% Mn increases resistance. Decreased sensitivity with higher Mn content after hydrogen gas exposure indicates increased electrical resistance in the film.
通过喷雾热解法，在 400 °C 下生成了浓度分别为 1% 和 3% 的氧化锌薄膜和（ZnO:Mn）薄膜。根据 X 射线衍射（XRD）研究，氧化锌薄膜为多晶体，具有立方结构，在一个方向上有明显的峰值（101）。晶粒尺寸随着锰含量的增加而增大，从 12.66 nm 增大到 14.66 nm。掺入锰后，氧化锌的应变（ε）减小，从 27.36 减小到 23.63。表面形貌和纳米结构研究表明，随着氧化锌薄膜中锰（Mn）含量的增加，晶簇粒度、平均粗糙度和均方根粗糙度（Rrms）都显著降低。扫描电子显微镜图像显示，锰含量增加后，纳米晶粒的形态发生了很大变化，从扁平的岛屿变成了球形。未掺杂 ZnO 在可见光区域的平均透射率大于 70%，而掺杂 1% 和 3% 锰的光学透射率则显示出卓越的光学透明度。当掺杂水平增加 1% 或 3% 时，吸收系数会上升。氧化锌的光带隙变宽：锰薄膜中允许直接转变的光带隙从 3.32 eV 减小到 3.21 eV。结果表明，薄膜的折射率和消光系数随着锰掺量的增加而降低。氢气降低了氧化锌薄膜的电阻，表明其具有 p 型行为。掺杂 3% 的锰会增加电阻。氢气暴露后，锰含量越高，灵敏度越低，这表明薄膜的电阻增加。
{"title":"Synthesis of Mn doped nanostructured zinc oxide thin films for H2 gas sensing","authors":"M. F. Allawai, M. S. Sada, A. M. Jabbar, K. N. Hussein, N. Habubi, S. Chiad, M. Jadan","doi":"10.15251/djnb.2024.192.793","DOIUrl":"https://doi.org/10.15251/djnb.2024.192.793","url":null,"abstract":"Thin films of zinc oxide and (ZnO:Mn) with 1% and 3% concentrations were created at 400 °C by spray pyrolysis. According to X-ray diffraction (XRD) investigation, ZnO films are polycrystalline and have a cubic structure with a distinct peak in one direction (101). The grain size increases as manganese content rise, from 12.66 nm to 14.66 nm. While the strain (ε) for ZnO reduced after manganese doping, it decreased from 27.36 to 23.63. Surface topography and nanostructure study reveal that as the manganese (Mn) content of ZnO films increased, cluster grain size, average roughness, and root mean square roughness (Rrms) all significantly reduced. SEM images show substantial morphological changes from flat islands to spherical nano-grains post-manganese via Mn content. The average transmittance was >70% in the visible area for Undoped ZnO and 1, 3% Manganese doping optical transmittance demonstrates exceptional optical transparency. When doping levels are increased by 1% or 3%, the absorption coefficient rises. The optical band gap widens in ZnO: Mn film for allowed direct transition has been decreased from (3.32 to 3.21) eV. Results illustrate that the films' refractive index and extinction coefficient decreases with increasing Mn Doped. Hydrogen gas decreases resistance in ZnO films, suggesting p-type behavior. Doping with 3% Mn increases resistance. Decreased sensitivity with higher Mn content after hydrogen gas exposure indicates increased electrical resistance in the film.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141379792","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 : 2024-06-06DOI: 10.15251/djnb.2024.192.761
M. J. Rao, K. S. R. Murthy, Ch. R. S. Kumar, B. P. Singh, G. Choudary, M. C. Varma, Mn CaWO4
This study presents the novel Mn doped CaWO4 nanophosphors as an excellent alternatives of rare earth free materials for display application. The Mn doped CaWO4 phosphor were characterized by various techniques, such as UV–Vis-DRS, Raman, PL analysis. Scheelite type tetragonal structure with space group I41/a has been confirmed. Rietveld analyses confirms the formation of single-phase solid solution. Lattice parameters for Mn free and Mn doped samples were calculated and observed that cell volume decreases after Mn incorporation. FTIR and Raman studies confirm the involvement of functional group and vibrational modes of vibration in the compound. Band gap values are estimated to be in the range of 4.2 to 4.33 eV with Mn doping. Photoluminescence study confirms the strong green emission at 450 and 515 nm (d-d transition in Mn2+) after Mn doping. Also, it was observed that strong emission peak appears ~422 nm is mainly due to the electronic transition, 1 T2 → 1 A1 in [WO4] 2- tetrahedron of CaWO4 host matrices. CIE study confirms that prepared nanophosphor exhibits strong blue colour after Mn incorporation. It can be employed as a potential material for blue phosphors in LEDs applications.
{"title":"Photoluminescence properties of manganese activated calcium tungstate phosphors","authors":"M. J. Rao, K. S. R. Murthy, Ch. R. S. Kumar, B. P. Singh, G. Choudary, M. C. Varma, Mn CaWO4","doi":"10.15251/djnb.2024.192.761","DOIUrl":"https://doi.org/10.15251/djnb.2024.192.761","url":null,"abstract":"This study presents the novel Mn doped CaWO4 nanophosphors as an excellent alternatives of rare earth free materials for display application. The Mn doped CaWO4 phosphor were characterized by various techniques, such as UV–Vis-DRS, Raman, PL analysis. Scheelite type tetragonal structure with space group I41/a has been confirmed. Rietveld analyses confirms the formation of single-phase solid solution. Lattice parameters for Mn free and Mn doped samples were calculated and observed that cell volume decreases after Mn incorporation. FTIR and Raman studies confirm the involvement of functional group and vibrational modes of vibration in the compound. Band gap values are estimated to be in the range of 4.2 to 4.33 eV with Mn doping. Photoluminescence study confirms the strong green emission at 450 and 515 nm (d-d transition in Mn2+) after Mn doping. Also, it was observed that strong emission peak appears ~422 nm is mainly due to the electronic transition, 1 T2 → 1 A1 in [WO4] 2- tetrahedron of CaWO4 host matrices. CIE study confirms that prepared nanophosphor exhibits strong blue colour after Mn incorporation. It can be employed as a potential material for blue phosphors in LEDs applications.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141375968","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 : 2024-05-15DOI: 10.15251/djnb.2024.192.707
T. A. Mohammed, M. W. Aziz, H. W. Hamed, J. M. Rzaij
This work involved designing a solar cell with layers of fluorine-doped tin oxide, titanium dioxide, methylammonium tin bromide, and cuprous iodide. The impact of absorbent layer thicknesses ranging from 0.2 μm to 2.5 μm on developed PSC properties was examined. The thickness of the absorption layer that performs the optimally is discovered to be 0.2 μm. The synthetic solar cell provided an open circuit voltage of 1.07 V, a short circuit current of 34.356 mA/cm2 , an efficiency of 30.68%, and a fill factor of 83.404 at an optimal thickness of 0.2 μm. The findings proved the developed PSC's cost-effectiveness, increased environmental sustainability, and robustness compared to traditional counterparts.
{"title":"Investigating the impact of MASnBr3 absorbent layer thickness on FTO/TiO2/MASnBr3/CuI perovskite solar cells characteristics","authors":"T. A. Mohammed, M. W. Aziz, H. W. Hamed, J. M. Rzaij","doi":"10.15251/djnb.2024.192.707","DOIUrl":"https://doi.org/10.15251/djnb.2024.192.707","url":null,"abstract":"This work involved designing a solar cell with layers of fluorine-doped tin oxide, titanium dioxide, methylammonium tin bromide, and cuprous iodide. The impact of absorbent layer thicknesses ranging from 0.2 μm to 2.5 μm on developed PSC properties was examined. The thickness of the absorption layer that performs the optimally is discovered to be 0.2 μm. The synthetic solar cell provided an open circuit voltage of 1.07 V, a short circuit current of 34.356 mA/cm2 , an efficiency of 30.68%, and a fill factor of 83.404 at an optimal thickness of 0.2 μm. The findings proved the developed PSC's cost-effectiveness, increased environmental sustainability, and robustness compared to traditional counterparts.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141127953","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 : 2024-05-15DOI: 10.15251/djnb.2024.192.679
N. A. Noor, F. Nasrullah, U. Afzaal, S. Mumtaz, M. Imran, I. M. Moussa
In this emerging technological era, lead-free (Li-based) inorganic halides have drawn a lot of researchers’ consideration due to their optoelectronic applications. Based on this, we explored theoretically mechanical, optical, and thermoelectric features of halides Li2TlBiY6 (Y = Cl, Br, I) by employing first-principle simulations (Wien2k code). Our finding of optoelectronic parameters using appropriate mBJ approach is in favorable alignment to previously reported data, and PBEsol is employed to scrutinize structural as well as mechanical features of these materials. The Born stability and formation energy are examined concerning the structural stability associated with all halides. The distinction between brittle and ductile nature is investigated concerning the calculation of elastic constants of the cubic symmetry. Being based on the mBJ potential, the bandgasps for Li2TlBiCl6, Li2TlBiBr6, and Li2TlBiI6 are 2.8 eV, 2.3 eV, and 1.9 eV, correspondingly. To confirm their optimal absorbability in the electromagnetic domain (visible), all halides were further analyzed concerning dielectric parameters. Additionally, thermoelectric properties are explained in detail within the temperature range of 300-800K using classical Boltzmann theory, making them promising materials for thermoelectric applications.
{"title":"First-principle simulations of inorganic halides Li2TlBiY6 (Y = Cl, Br, I) for optoelectronic applications","authors":"N. A. Noor, F. Nasrullah, U. Afzaal, S. Mumtaz, M. Imran, I. M. Moussa","doi":"10.15251/djnb.2024.192.679","DOIUrl":"https://doi.org/10.15251/djnb.2024.192.679","url":null,"abstract":"In this emerging technological era, lead-free (Li-based) inorganic halides have drawn a lot of researchers’ consideration due to their optoelectronic applications. Based on this, we explored theoretically mechanical, optical, and thermoelectric features of halides Li2TlBiY6 (Y = Cl, Br, I) by employing first-principle simulations (Wien2k code). Our finding of optoelectronic parameters using appropriate mBJ approach is in favorable alignment to previously reported data, and PBEsol is employed to scrutinize structural as well as mechanical features of these materials. The Born stability and formation energy are examined concerning the structural stability associated with all halides. The distinction between brittle and ductile nature is investigated concerning the calculation of elastic constants of the cubic symmetry. Being based on the mBJ potential, the bandgasps for Li2TlBiCl6, Li2TlBiBr6, and Li2TlBiI6 are 2.8 eV, 2.3 eV, and 1.9 eV, correspondingly. To confirm their optimal absorbability in the electromagnetic domain (visible), all halides were further analyzed concerning dielectric parameters. Additionally, thermoelectric properties are explained in detail within the temperature range of 300-800K using classical Boltzmann theory, making them promising materials for thermoelectric applications.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141128302","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 : 2024-05-15DOI: 10.15251/djnb.2024.192.751
K. Hou, Y. W. Meng, D. Q. Liu, X. D. Zhu, Y. B. Yun
In this research work, a fluorine-free, durable, and excellent self-cleaning and oil-water separation performance kaolin/polydimethylsiloxane/cotton fabrics (Kaolin/PDMS/cotton) superhydrophobic surface was successfully prepared. The morphology, wettability, and phase composition of the coating were characterized and tested using scanning electron microscopy (SEM), dynamic contact angle measuring instrument, and X-ray diffraction (XRD). The experimental results showed that the organic composite of hydrophobic modified kaolin particles and cotton fabrics was successfully achieved through the bridging effect of PDMS. A dense superhydrophobic micro-nano structure coating was constructed on the surface of cotton fibers, and the tested performance was excellent. Has good local anti-pollution performance for common coffee, Coca-Cola, dyeing water, and simulated dust; After being worn for a distance of 1200 centimeters under a load of 10KPa, the contact angle with water remained above 150°, indicating excellent durability of the coating; In addition, kaolin/PDMS/cotton also exhibited good oil/water separation performance. After 15 cycles of oil-water separation tests, the separation efficiency for gasoline and dichloromethane both exceeded 96%.
{"title":"Preparation and performance study of environmentally friendly and durable kaolin/PDMS/cotton fabrics superhydrophobic surface","authors":"K. Hou, Y. W. Meng, D. Q. Liu, X. D. Zhu, Y. B. Yun","doi":"10.15251/djnb.2024.192.751","DOIUrl":"https://doi.org/10.15251/djnb.2024.192.751","url":null,"abstract":"In this research work, a fluorine-free, durable, and excellent self-cleaning and oil-water separation performance kaolin/polydimethylsiloxane/cotton fabrics (Kaolin/PDMS/cotton) superhydrophobic surface was successfully prepared. The morphology, wettability, and phase composition of the coating were characterized and tested using scanning electron microscopy (SEM), dynamic contact angle measuring instrument, and X-ray diffraction (XRD). The experimental results showed that the organic composite of hydrophobic modified kaolin particles and cotton fabrics was successfully achieved through the bridging effect of PDMS. A dense superhydrophobic micro-nano structure coating was constructed on the surface of cotton fibers, and the tested performance was excellent. Has good local anti-pollution performance for common coffee, Coca-Cola, dyeing water, and simulated dust; After being worn for a distance of 1200 centimeters under a load of 10KPa, the contact angle with water remained above 150°, indicating excellent durability of the coating; In addition, kaolin/PDMS/cotton also exhibited good oil/water separation performance. After 15 cycles of oil-water separation tests, the separation efficiency for gasoline and dichloromethane both exceeded 96%.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141128195","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 : 2024-05-15DOI: 10.15251/djnb.2024.192.693
Q. Lou, S. Zhong, T. Li, S. Ling
Hydrogen gas generated through water electrolysis can replace fossil fuels. Thus, developing cost-effective and efficient water-splitting electrocatalysts for oxygen evolution reaction is highly important. Herein, biomass-porous-carbon-supported sulphur-doped flower-like NiFe-based alloy composites are prepared using an in situ impregnation–heat treatment technology. The spherical flower (diameter ≈ 1 μm, petal thickness ≈ 20 nm) main components are Ni0.5Fe0.5 and Fe9Ni9S16. The 800 °C heat-treated catalyst demonstrates outstanding catalytic performance in oxygen evolution reactions. At a current density of 10 mA cm−2 , it exhibits a minimal overpotential of 298.62 mV
通过水电解产生的氢气可以替代化石燃料。因此，开发具有成本效益且高效的用于氧进化反应的分水电催化剂非常重要。本文采用原位浸渍-热处理技术制备了生物质多孔碳支撑硫掺杂花状镍铁合金复合材料。球形花朵（直径≈ 1 μm，花瓣厚度≈ 20 nm）的主要成分是 Ni0.5Fe0.5 和 Fe9Ni9S16。经过 800 °C 热处理的催化剂在氧进化反应中表现出卓越的催化性能。在 10 mA cm-2 的电流密度下，它的过电位为 298.62 mV。
{"title":"Preparation and oxygen-evolution-reaction performance of sulphur-doped flower-like NiFe-based composites supported on biomass porous carbon","authors":"Q. Lou, S. Zhong, T. Li, S. Ling","doi":"10.15251/djnb.2024.192.693","DOIUrl":"https://doi.org/10.15251/djnb.2024.192.693","url":null,"abstract":"Hydrogen gas generated through water electrolysis can replace fossil fuels. Thus, developing cost-effective and efficient water-splitting electrocatalysts for oxygen evolution reaction is highly important. Herein, biomass-porous-carbon-supported sulphur-doped flower-like NiFe-based alloy composites are prepared using an in situ impregnation–heat treatment technology. The spherical flower (diameter ≈ 1 μm, petal thickness ≈ 20 nm) main components are Ni0.5Fe0.5 and Fe9Ni9S16. The 800 °C heat-treated catalyst demonstrates outstanding catalytic performance in oxygen evolution reactions. At a current density of 10 mA cm−2 , it exhibits a minimal overpotential of 298.62 mV","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141128253","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 : 2024-05-15DOI: 10.15251/djnb.2024.192.743
N. Giagkas, J. Nasr, D. Matei, S. Vizireanu, D. Cursaru, S. Mihai
This paper focuses on synthesis and characterization of Zr/Ti and Ti/Zr nitride multilayer coatings by magnetron plasma sputtering to enhance the tribologic properties. The synthesis of nitrides was achieved by non-reactive deposition using Ti or Zr nitride targets or by reactive deposition using Ti or Zr targets in the presence of nitrogen. The formation of nitride layers was highlighted by XRD, EDX and XPS investigations, while the tribologic properties were made with HFRR equipment. The tribological study showed that the coefficient of friction and wear scar diameter decrease in multilayer films with zirconium nitride as the upper layer.
本文的重点是通过磁控等离子体溅射合成和表征 Zr/Ti 和 Ti/Zr 氮化物多层涂层，以提高其摩擦学性能。氮化物的合成是通过使用 Ti 或 Zr 氮化物靶材进行非反应沉积或在氮气存在下使用 Ti 或 Zr 靶材进行反应沉积实现的。通过 XRD、EDX 和 XPS 研究了氮化物层的形成，并使用 HFRR 设备进行了摩擦学特性研究。摩擦学研究表明，以氮化锆为上层的多层薄膜的摩擦系数和磨损痕直径都有所下降。
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Pub Date : 2024-05-15DOI: 10.15251/djnb.2024.192.717
E. H. Hadia, F. H. Jasim, S. S. Chiad, K. N. Hussein, N. F. Habubi, Y. H. Kadhim, M. Jadan
In these studies, radio frequency (RF) magnetron sputtering was used to produce nanostructured CuO thin films on glass bases with different thicknesses of (250, 300, and 350 nm). X-ray diffraction (XRD) analysis of these films revealed a polycrystalline structure with a preferred peak along the (111) plane. The Scherrer formula was used to compute the grain size. It was found that the average grain sizes are 10.78 nm, 11.36 nm, and 11.84 nm for film thicknesses of 250, 3000, and 300 nm, respectively, while the dislocation density and strain values decline. The surface roughness decreased from 9.30 nm to 4.71 nm as the thickness increased, according to atomic force microscopy (AFM) data. As the thickness of the film grew, the root mean square (RMS) roughness likewise decreased from 9.18 nm to 4.29 nm. The homogenous, semi-spherical structure comprises uniformly distributed particles, as demonstrated by SEM images. The optical properties of the grown films showed that the absorption coefficient considerably increased with film thickness. Transmittance, band gap, refractive index, and extinction coefficient all decrease with increasing film thickness. The hydrogen gas measurements, indicated a reduction in sensitivity as the thickness and gas concentration increased at 30°C.
{"title":"Thickness effects on the physical characterization of nanostructured CuO thin films for hydrogen gas sensor","authors":"E. H. Hadia, F. H. Jasim, S. S. Chiad, K. N. Hussein, N. F. Habubi, Y. H. Kadhim, M. Jadan","doi":"10.15251/djnb.2024.192.717","DOIUrl":"https://doi.org/10.15251/djnb.2024.192.717","url":null,"abstract":"In these studies, radio frequency (RF) magnetron sputtering was used to produce nanostructured CuO thin films on glass bases with different thicknesses of (250, 300, and 350 nm). X-ray diffraction (XRD) analysis of these films revealed a polycrystalline structure with a preferred peak along the (111) plane. The Scherrer formula was used to compute the grain size. It was found that the average grain sizes are 10.78 nm, 11.36 nm, and 11.84 nm for film thicknesses of 250, 3000, and 300 nm, respectively, while the dislocation density and strain values decline. The surface roughness decreased from 9.30 nm to 4.71 nm as the thickness increased, according to atomic force microscopy (AFM) data. As the thickness of the film grew, the root mean square (RMS) roughness likewise decreased from 9.18 nm to 4.29 nm. The homogenous, semi-spherical structure comprises uniformly distributed particles, as demonstrated by SEM images. The optical properties of the grown films showed that the absorption coefficient considerably increased with film thickness. Transmittance, band gap, refractive index, and extinction coefficient all decrease with increasing film thickness. The hydrogen gas measurements, indicated a reduction in sensitivity as the thickness and gas concentration increased at 30°C.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141127762","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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