Pub Date : 2023-09-20DOI: 10.15251/djnb.2023.183.1007
M. Ahmed, A. Alshahrie, E. R. Shaaban
This study used spray pyrolysis to create CdO films that were undoped and doped with Cu at varied concentrations (0, 1, 2, 3, 4 and 5%). The materials' polycrystalline cubic nature is confirmed by XRD examination. Rietveld refinement was used to get the lattice constant. In terms of energy dispersive more about the chemical makeup of materials. The structure, morphological, optical, and electrical properties of the film were investigated using the (XRD), (SEM), UV- spectrophotometer, and Hall arrangement. The band optical gaps, opt E g , of the CdO:Cu films were observed to decrease as the quantity of Cu doping increased. Also, effective Cu doping enhances the electrical characteristics of CdO, as shown by the film's 3 % resistivity. The carrier concentration is approximately 5x1020 of that 2.25x1020 of the undoped film, whereas the amount of Cu doping is approximately ten of that of the CdO film. To increase both optical and electrical properties in a variety of optoelectronic device applications, Cu-CdO films can be used as Transparent Conducting Oxide (TCO) materials.
{"title":"Investigations into the structural, morphology and optoelectronics properties of the CdO:Cu films produced by spray pyrolysis","authors":"M. Ahmed, A. Alshahrie, E. R. Shaaban","doi":"10.15251/djnb.2023.183.1007","DOIUrl":"https://doi.org/10.15251/djnb.2023.183.1007","url":null,"abstract":"This study used spray pyrolysis to create CdO films that were undoped and doped with Cu at varied concentrations (0, 1, 2, 3, 4 and 5%). The materials' polycrystalline cubic nature is confirmed by XRD examination. Rietveld refinement was used to get the lattice constant. In terms of energy dispersive more about the chemical makeup of materials. The structure, morphological, optical, and electrical properties of the film were investigated using the (XRD), (SEM), UV- spectrophotometer, and Hall arrangement. The band optical gaps, opt E g , of the CdO:Cu films were observed to decrease as the quantity of Cu doping increased. Also, effective Cu doping enhances the electrical characteristics of CdO, as shown by the film's 3 % resistivity. The carrier concentration is approximately 5x1020 of that 2.25x1020 of the undoped film, whereas the amount of Cu doping is approximately ten of that of the CdO film. To increase both optical and electrical properties in a variety of optoelectronic device applications, Cu-CdO films can be used as Transparent Conducting Oxide (TCO) materials.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136375038","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 : 2023-09-20DOI: 10.15251/djnb.2023.183.1017
H.A.T. Al-ogaili, S. F. Hathot
In the beginning, NiO/SnO2 nanocomposite thin film was prepared of nickel nitrate (1.5213) gm that was weighed and dissolved in distilled water to obtain a specific molar concentration at room temperature and prepared as nanoparticles and mixed with half mount (0.5121) gm of SnO2, in addition to other steps to obtain on the nanocomposite to study some features it. The structural properties of nanocomposite thin films using the chemical technique studied, such as XRD, FE-SEM, and AFM, were found that NiO/SnO2 Nano-composite crystallizes are hexagonal structures with an average crystallite size of 16.30nm. also, the FE-SEM images study the morphology of the NiO: SnO2 thin films, it catches sight of the nanostructure thin films of the NiO: SnO2 Clearly, the surface roughness of nanocomposite according to AFM noted that gets better as a result of the radical’s mobility. The FT-IR spectrum of the synthesized composite has been studied. UV-Spectral absorption of NiO: SnO2 where peak range of wavelength (225-550) nm and notice an increase in the absorption range towards the red wavelength after adding nickel oxide, and use the prepared sample in applied as photosensitive electrodes, voltage characteristics of chemical synthesized: SnO2 nanoparticles shows the current vs voltage plot of chemical-synthesized NiO: SnO2 nanoparticles coated onto glass substrates using dip coating method where add SnO2 due to increasing the conductivity of the nanocomposite.
{"title":"Photo-sensitive electrodes based on NiO: SnO2 Nano-composites prepared by chemical method","authors":"H.A.T. Al-ogaili, S. F. Hathot","doi":"10.15251/djnb.2023.183.1017","DOIUrl":"https://doi.org/10.15251/djnb.2023.183.1017","url":null,"abstract":"In the beginning, NiO/SnO2 nanocomposite thin film was prepared of nickel nitrate (1.5213) gm that was weighed and dissolved in distilled water to obtain a specific molar concentration at room temperature and prepared as nanoparticles and mixed with half mount (0.5121) gm of SnO2, in addition to other steps to obtain on the nanocomposite to study some features it. The structural properties of nanocomposite thin films using the chemical technique studied, such as XRD, FE-SEM, and AFM, were found that NiO/SnO2 Nano-composite crystallizes are hexagonal structures with an average crystallite size of 16.30nm. also, the FE-SEM images study the morphology of the NiO: SnO2 thin films, it catches sight of the nanostructure thin films of the NiO: SnO2 Clearly, the surface roughness of nanocomposite according to AFM noted that gets better as a result of the radical’s mobility. The FT-IR spectrum of the synthesized composite has been studied. UV-Spectral absorption of NiO: SnO2 where peak range of wavelength (225-550) nm and notice an increase in the absorption range towards the red wavelength after adding nickel oxide, and use the prepared sample in applied as photosensitive electrodes, voltage characteristics of chemical synthesized: SnO2 nanoparticles shows the current vs voltage plot of chemical-synthesized NiO: SnO2 nanoparticles coated onto glass substrates using dip coating method where add SnO2 due to increasing the conductivity of the nanocomposite.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136375037","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 : 2023-09-20DOI: 10.15251/djnb.2023.183.1065
J. Li, S. P. Qiu, H. F. Zhao, D. L. Guo, Z. Y. Yan, J. H. Wu, J. Li
In this study, the renewable magnetic lignin-based material with good properties and environmental friendliness was successfully prepared and used for the treatment of wastewater. Lignin nanospheres (LNS) were prepared from stearyl chloride esterified alkali lignin via self-assembly in the mixture and raspberry-like magnetic lignin microspheres (Fe3O4@SiO2-LNS) was successfully prepared by grafting LNS onto the surface of Fe3O4@SiO2 particles by chemical crosslinking, then was used as absorbent for Methylene blue (MB) and Rhodamine B (RhB) dyes. The results indicated that the Fe3O4@SiO2-LNS had excellent adsorptivity in alkaline solution, and the maximum adsorption capacities for MB and RhB were 258.40 mg·g-1 and 124.38 mg·g-1 , respectively. The Fe3O4@SiO2-LNS adsorbent can be recycled due to its good magnetism and the regeneration efficiency is over 85% after three cycles. Therefore, the prepared magnetic lignin-based adsorbent is a lowcost, high-efficiency and reusable adsorbent for wastewater treatment.
{"title":"Preparation of magnetic lignin-based adsorbents and its adsorption properties for dyes","authors":"J. Li, S. P. Qiu, H. F. Zhao, D. L. Guo, Z. Y. Yan, J. H. Wu, J. Li","doi":"10.15251/djnb.2023.183.1065","DOIUrl":"https://doi.org/10.15251/djnb.2023.183.1065","url":null,"abstract":"In this study, the renewable magnetic lignin-based material with good properties and environmental friendliness was successfully prepared and used for the treatment of wastewater. Lignin nanospheres (LNS) were prepared from stearyl chloride esterified alkali lignin via self-assembly in the mixture and raspberry-like magnetic lignin microspheres (Fe3O4@SiO2-LNS) was successfully prepared by grafting LNS onto the surface of Fe3O4@SiO2 particles by chemical crosslinking, then was used as absorbent for Methylene blue (MB) and Rhodamine B (RhB) dyes. The results indicated that the Fe3O4@SiO2-LNS had excellent adsorptivity in alkaline solution, and the maximum adsorption capacities for MB and RhB were 258.40 mg·g-1 and 124.38 mg·g-1 , respectively. The Fe3O4@SiO2-LNS adsorbent can be recycled due to its good magnetism and the regeneration efficiency is over 85% after three cycles. Therefore, the prepared magnetic lignin-based adsorbent is a lowcost, high-efficiency and reusable adsorbent for wastewater treatment.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136375026","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 : 2023-09-20DOI: 10.15251/djnb.2023.183.1051
B. M. Alotaibi, H. A. Al-Yousef, A. Atta, F. Taher
In this research, various concentrations of manganese dioxide (MnO2) is composed by polyvinyl alcohol (PVA) to forming PVA /MnO2 films. The XRD and SEM are respectively demonstrated the structure and morphological characteristics of the films. The XRD results show that the PVA/MnO2 films is fabricated successfully. The SEM results demonstrate that MnO2 is dispersed evenly along the PVA polymeric chains. The conductivity, impedance and energy density were measured via an LCR bridge with frequency 102 to 106 Hz. There is an increase in dielectric from 64 for PVA to 95 for PVA/0.06MnO2 at 105 Hz, and also the conductivity increases from 3.61x10-3 S/cm for PVA to 5.33x10-3 S/cm for PVA/0.06MnO2. The optical characteristics of PVA and PVA/MnO2 films were recorded by UV/Vis spectroscopy. The band gap reduced from 5.01 eV for PVA to 4.85, 4.71, 4.59 eV respectively for PVA/0.02MnO2, PVA/0.04MnO2, and PVA/0.06MnO2. And the Urbach tail is modified from 1.72 eV for PVA to 3.12, 3.453, and 3.66 eV respectively. The results of the present work open the possibility for applied in different devices as energy storage systems and optoelectronics.
{"title":"Characterization, electrical and optical properties of PVA/MnO2 nanocomposite materials","authors":"B. M. Alotaibi, H. A. Al-Yousef, A. Atta, F. Taher","doi":"10.15251/djnb.2023.183.1051","DOIUrl":"https://doi.org/10.15251/djnb.2023.183.1051","url":null,"abstract":"In this research, various concentrations of manganese dioxide (MnO2) is composed by polyvinyl alcohol (PVA) to forming PVA /MnO2 films. The XRD and SEM are respectively demonstrated the structure and morphological characteristics of the films. The XRD results show that the PVA/MnO2 films is fabricated successfully. The SEM results demonstrate that MnO2 is dispersed evenly along the PVA polymeric chains. The conductivity, impedance and energy density were measured via an LCR bridge with frequency 102 to 106 Hz. There is an increase in dielectric from 64 for PVA to 95 for PVA/0.06MnO2 at 105 Hz, and also the conductivity increases from 3.61x10-3 S/cm for PVA to 5.33x10-3 S/cm for PVA/0.06MnO2. The optical characteristics of PVA and PVA/MnO2 films were recorded by UV/Vis spectroscopy. The band gap reduced from 5.01 eV for PVA to 4.85, 4.71, 4.59 eV respectively for PVA/0.02MnO2, PVA/0.04MnO2, and PVA/0.06MnO2. And the Urbach tail is modified from 1.72 eV for PVA to 3.12, 3.453, and 3.66 eV respectively. The results of the present work open the possibility for applied in different devices as energy storage systems and optoelectronics.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136375036","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 : 2023-09-20DOI: 10.15251/djnb.2023.183.1079
S. Haq, W. Rehman, M. Waseem, Kh. Elmnasri, A. Hedfi, M. Ben Ali, E. Mahmoudi, M. Ur Rehman, B. Khan
This study is focused on the effects of annealing temperature and pH on the crystallinity of cobalt oxide (Co3O4) nanoparticles (NPs) synthesized via sol-gel method. X-ray diffraction (XRD) analysis was carried out to investigate the crystalline structure and size of the NPs. The results indicated that increasing the pH from 10 to 14 during NPs synthesis led to an increase in crystallinity, as evidenced by the appearance of Bragg reflections upon calcination. On the other hand, increasing the calcination temperature from 120°C to 800°C also increased the crystallinity of Co3O4 NPs, as seen by the appearance of additional Bragg reflections and an increase in crystallite size. These findings demonstrate the significance of pH and calcination temperature in controlling the crystallinity and properties of Co3O4 NPs.
{"title":"Variation in the crystallinity of cobalt oxide nanoparticles with increasing annealing temperature and pH","authors":"S. Haq, W. Rehman, M. Waseem, Kh. Elmnasri, A. Hedfi, M. Ben Ali, E. Mahmoudi, M. Ur Rehman, B. Khan","doi":"10.15251/djnb.2023.183.1079","DOIUrl":"https://doi.org/10.15251/djnb.2023.183.1079","url":null,"abstract":"This study is focused on the effects of annealing temperature and pH on the crystallinity of cobalt oxide (Co3O4) nanoparticles (NPs) synthesized via sol-gel method. X-ray diffraction (XRD) analysis was carried out to investigate the crystalline structure and size of the NPs. The results indicated that increasing the pH from 10 to 14 during NPs synthesis led to an increase in crystallinity, as evidenced by the appearance of Bragg reflections upon calcination. On the other hand, increasing the calcination temperature from 120°C to 800°C also increased the crystallinity of Co3O4 NPs, as seen by the appearance of additional Bragg reflections and an increase in crystallite size. These findings demonstrate the significance of pH and calcination temperature in controlling the crystallinity and properties of Co3O4 NPs.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136375027","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 : 2023-09-20DOI: 10.15251/djnb.2023.183.1093
G. S. Aguilar-Moreno, T. Espinosa-Solares, J. M. Santos-Gaspar, E. Montes-Ramírez, M. Á. Aguilar-Méndez, L. Martinez-Maestro, E. Navarro-Cerón
The NaGdF4:Nd3+@Ni core@shell nanoparticles were synthesized and characterized. First, core@shell nanoparticles were synthesized using a solvothermal method to obtain the NaGdF4:Nd3+ core with hexagonal phase; subsequently, a chemical reduction was performed to stimulate the growth of the Ni shell with cubic phase. NaGdF4:Nd3+@Ni nanoparticles were characterized by transmission electron microscope, zeta potential, X-ray diffraction, scattered energy spectroscopy, UV-Vis, and photoluminescence emission spectra. The nanoparticles were round in shape, with mean sizes around 250 nm. The core@shell nanoparticles presented a homogenous composition and good stability. The photoluminescent emission of the nanoparticles was recorded at 1059 nm in the nearinfrared spectral range; this band corresponds to the 4 F3/2→4 I11/2 radiative transitions of Nd3+ ions. The synthesized nanoparticles, being hydrophilic, have potential for use in different areas, one of them could be in anaerobic digestion.
{"title":"Synthesis and characterization of NaGdF4:Nd3+@Ni Core@Shell nanoparticles with potential applications in anaerobic digestion","authors":"G. S. Aguilar-Moreno, T. Espinosa-Solares, J. M. Santos-Gaspar, E. Montes-Ramírez, M. Á. Aguilar-Méndez, L. Martinez-Maestro, E. Navarro-Cerón","doi":"10.15251/djnb.2023.183.1093","DOIUrl":"https://doi.org/10.15251/djnb.2023.183.1093","url":null,"abstract":"The NaGdF4:Nd3+@Ni core@shell nanoparticles were synthesized and characterized. First, core@shell nanoparticles were synthesized using a solvothermal method to obtain the NaGdF4:Nd3+ core with hexagonal phase; subsequently, a chemical reduction was performed to stimulate the growth of the Ni shell with cubic phase. NaGdF4:Nd3+@Ni nanoparticles were characterized by transmission electron microscope, zeta potential, X-ray diffraction, scattered energy spectroscopy, UV-Vis, and photoluminescence emission spectra. The nanoparticles were round in shape, with mean sizes around 250 nm. The core@shell nanoparticles presented a homogenous composition and good stability. The photoluminescent emission of the nanoparticles was recorded at 1059 nm in the nearinfrared spectral range; this band corresponds to the 4 F3/2→4 I11/2 radiative transitions of Nd3+ ions. The synthesized nanoparticles, being hydrophilic, have potential for use in different areas, one of them could be in anaerobic digestion.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136377360","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 : 2023-09-20DOI: 10.15251/djnb.2023.183.1039
F. A. Jasim, Z. S. A. Mosa, N. F. Habubi, Y. H. Kadhim, S. S. Chiad
Thermal evaporation technique has been used to produce silver oxide (AgO). The findings demonstrate that the crystal quality of the AgO film was dominated by the thin and sharp peaks at (111) plans. Atomic Force Microscopy (AFM) confirm that the distribution grains size appears nanostructure and homogeneous in all films. RMS decreased from 6.84 nm to 2.17 nm with thicknesses 200 nm. The surface roughness decreased from 7.82 nm to 3.22 nm. The distribution of grains size appears nanostructured and homogeneous in all films, and a slight decrease in average particle size. The surface displayed that the roughness decreased with the increase in thicknesses. The spectrum fluctuation of their optical constants has been calculated using transmittance and absorption data. In the visible region of the wavelength, all films have a high absorption coefficient with a value of 104 (cm-1 ). According to the optical measurements, the films have a band gap between 1.73 and 1.61 eV. The Extinction coefficient and refractive index drop as film thickness rises.
{"title":"Characterization of silver oxide thin films with thickness variation prepared by thermal evaporation method","authors":"F. A. Jasim, Z. S. A. Mosa, N. F. Habubi, Y. H. Kadhim, S. S. Chiad","doi":"10.15251/djnb.2023.183.1039","DOIUrl":"https://doi.org/10.15251/djnb.2023.183.1039","url":null,"abstract":"Thermal evaporation technique has been used to produce silver oxide (AgO). The findings demonstrate that the crystal quality of the AgO film was dominated by the thin and sharp peaks at (111) plans. Atomic Force Microscopy (AFM) confirm that the distribution grains size appears nanostructure and homogeneous in all films. RMS decreased from 6.84 nm to 2.17 nm with thicknesses 200 nm. The surface roughness decreased from 7.82 nm to 3.22 nm. The distribution of grains size appears nanostructured and homogeneous in all films, and a slight decrease in average particle size. The surface displayed that the roughness decreased with the increase in thicknesses. The spectrum fluctuation of their optical constants has been calculated using transmittance and absorption data. In the visible region of the wavelength, all films have a high absorption coefficient with a value of 104 (cm-1 ). According to the optical measurements, the films have a band gap between 1.73 and 1.61 eV. The Extinction coefficient and refractive index drop as film thickness rises.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136377806","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 : 2023-09-20DOI: 10.15251/djnb.2023.183.1025
S. Kanwal, M. T. Khan, A. Zaman, V. Tirth, A. Algahtani, T. Al-Mughanam
In current study, ZnO and Fe/Co co-doped ZnO (Zn1-x Fe0.05 Cox O where x = 0, 0.005) nanoparticles were prepared by using two different methodologies: sol gel method and coprecipitation method. The structural properties were determined by X-Ray diffraction technique which verifies the hexagonal wurtzite structure of prepared nanoparticles. Crystallite size varies from 18.68-37.43 nm for the samples synthesized by co-precipitation method and it varies from 19.97-38.45 nm for sol-gel method. Fourier transform infrared transmittance spectra were used to investigate the type of functional groups present in all the prepared nanoparticles. The UV-Visible absorption spectroscopy was employed to investigate the optical properties of ZnO and doping of Fe/Co in ZnO semiconducting host. The energy band gap varies from 3.03 - 3.68 eV for the samples synthesized by coprecipitation method and for sol-gel method, it ranges from 3.13 - 3.86 eV, by increasing dopant concentration. Vibrating sample magnetometer was used to inquire the magnetic behavior of synthesized nanoparticles which shows the weak ferromagnetic behavior of the doped nanoparticles prepared by both the techniques. Samples prepared by co-precipitation method showed higher values of saturation magnetization and coercivity as compared to the samples prepared by the sol-gel method. In comparison of two synthesis techniques, a slight change was observed in the particle size, energy band gap and magnetization values. The improved optical and magnetic behavior favors the co-precipitation method rather than sol gel method for obtaining room temperature ferromagnetism for practical applications in spintronics field.
本研究采用溶胶凝胶法和共沉淀法制备了ZnO和Fe/Co共掺杂ZnO纳米粒子(Zn1-x Fe0.05 Cox O, x = 0,0.005)。用x射线衍射技术测定了纳米颗粒的结构性质，证实了纳米颗粒的六方纤锌矿结构。共沉淀法合成的样品晶粒尺寸为18.68 ~ 37.43 nm，溶胶-凝胶法合成的样品晶粒尺寸为19.97 ~ 38.45 nm。利用傅里叶变换红外透射光谱研究了所制备的纳米颗粒中官能团的类型。利用紫外-可见吸收光谱研究了ZnO的光学性质和Fe/Co在ZnO半导体基体中的掺杂。随着掺杂剂浓度的增加，共沉淀法合成的样品带隙在3.03 ~ 3.68 eV之间，溶胶-凝胶法合成的样品带隙在3.13 ~ 3.86 eV之间。用振动样品磁强计对合成的纳米粒子的磁性行为进行了研究，结果表明两种方法制备的掺杂纳米粒子具有弱铁磁性。与溶胶-凝胶法制备的样品相比，共沉淀法制备的样品具有更高的饱和磁化强度和矫顽力。在两种合成方法的比较中，观察到颗粒尺寸，能带隙和磁化值略有变化。在自旋电子学领域的实际应用中，光学和磁性行为的改善有利于共沉淀法而不是溶胶-凝胶法获得室温铁磁性。
{"title":"Comparison the effect of co-precipitation and sol-gel techniques on the structural and magnetic attributes of ZnO and Zn(1-x)Fe0.05CoxO nanoparticles for attaining room temperature ferromagnetism (RTFM)","authors":"S. Kanwal, M. T. Khan, A. Zaman, V. Tirth, A. Algahtani, T. Al-Mughanam","doi":"10.15251/djnb.2023.183.1025","DOIUrl":"https://doi.org/10.15251/djnb.2023.183.1025","url":null,"abstract":"In current study, ZnO and Fe/Co co-doped ZnO (Zn1-x Fe0.05 Cox O where x = 0, 0.005) nanoparticles were prepared by using two different methodologies: sol gel method and coprecipitation method. The structural properties were determined by X-Ray diffraction technique which verifies the hexagonal wurtzite structure of prepared nanoparticles. Crystallite size varies from 18.68-37.43 nm for the samples synthesized by co-precipitation method and it varies from 19.97-38.45 nm for sol-gel method. Fourier transform infrared transmittance spectra were used to investigate the type of functional groups present in all the prepared nanoparticles. The UV-Visible absorption spectroscopy was employed to investigate the optical properties of ZnO and doping of Fe/Co in ZnO semiconducting host. The energy band gap varies from 3.03 - 3.68 eV for the samples synthesized by coprecipitation method and for sol-gel method, it ranges from 3.13 - 3.86 eV, by increasing dopant concentration. Vibrating sample magnetometer was used to inquire the magnetic behavior of synthesized nanoparticles which shows the weak ferromagnetic behavior of the doped nanoparticles prepared by both the techniques. Samples prepared by co-precipitation method showed higher values of saturation magnetization and coercivity as compared to the samples prepared by the sol-gel method. In comparison of two synthesis techniques, a slight change was observed in the particle size, energy band gap and magnetization values. The improved optical and magnetic behavior favors the co-precipitation method rather than sol gel method for obtaining room temperature ferromagnetism for practical applications in spintronics field.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136377811","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 : 2023-07-20DOI: 10.15251/djnb.2023.183.805
M. A. Bello, R. Azis, M. K. Shabdin, N. Osman, A. Yakubu
This study explored the microwave attenuation and shielding properties of PTFE/Fe2O3/OPEFB composites in the X-band frequency range. Fe2O3 nanoparticles were incorporated into the PTFE/OPEFB matrix using a powder-dry mixing technique. The composites were characterized using XRD and FESEM, and attenuation performance was evaluated using a VNA. The results indicated that the addition of Fe2O3 nanoparticles improved microwave attenuation and shielding properties, with the composite containing 15 wt% Fe2O3 exhibiting the highest attenuation of 16.02 dB. The homogeneous dispersion of Fe2O3 nanoparticles was confirmed through FESEM analysis, and XRD analysis confirmed the presence of Fe2O3 nanoparticles in the composites. The study concludes that PTFE/ Fe2O3/OPEFB composites have potential for electromagnetic interference shielding applications in aerospace, telecommunications, and electronics industries.
{"title":"Investigation of microwave attenuation and shielding performance of PTFE/Fe2O3/OPEFB composites at X-band frequency","authors":"M. A. Bello, R. Azis, M. K. Shabdin, N. Osman, A. Yakubu","doi":"10.15251/djnb.2023.183.805","DOIUrl":"https://doi.org/10.15251/djnb.2023.183.805","url":null,"abstract":"This study explored the microwave attenuation and shielding properties of PTFE/Fe2O3/OPEFB composites in the X-band frequency range. Fe2O3 nanoparticles were incorporated into the PTFE/OPEFB matrix using a powder-dry mixing technique. The composites were characterized using XRD and FESEM, and attenuation performance was evaluated using a VNA. The results indicated that the addition of Fe2O3 nanoparticles improved microwave attenuation and shielding properties, with the composite containing 15 wt% Fe2O3 exhibiting the highest attenuation of 16.02 dB. The homogeneous dispersion of Fe2O3 nanoparticles was confirmed through FESEM analysis, and XRD analysis confirmed the presence of Fe2O3 nanoparticles in the composites. The study concludes that PTFE/ Fe2O3/OPEFB composites have potential for electromagnetic interference shielding applications in aerospace, telecommunications, and electronics industries.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44019337","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 : 2023-07-20DOI: 10.15251/djnb.2023.183.841
M. Basir, S. Supardan, S. A. Kamil
The effect of annealing temperature on the photocatalyst's structural, morphological, photocatalytic and optical properties have been extensively studied. In this work, the Cu-Ni co-doped TiO2 powder was prepared by the sol-gel technique and annealed at temperatures 400°C, 500°C, 600°C, 700°C, and 800°C. The structural phase of the Cu-Ni/TiO2 changed from anatase to rutile after the annealing temperature increased from 400°C to 800°C. The anatase phase was found at 400°C and 500°C, the mixed phase at 600 and 700°C, and the rutile phase at 800°C. The specific surface area and band gap of Cu-Ni/TiO2 were decreased with the increment of annealing temperatures from 70.00 to 24.89 m2 /g and 3.36 eV to 3.04 eV, respectively. Meanwhile, as the annealing temperature rises, the average particle size increases from 38.52 to 173.59 nm. The anatase-rutile mixed phase of Cu-Ni/TiO2 annealed at 600°C exhibited the highest photocatalytic degradation of methylene blue (MB) with 62.81% MB removal. Experimental results indicated that the annealing temperature could alter the structural, morphological, and optical properties of the Cu-Ni/TiO2, affecting the photocatalytic activity performance.
{"title":"Effect of annealing temperature on the structural, morphological, photocatalytic and optical properties of the Cu-Ni co-doped TiO2 nanoparticles","authors":"M. Basir, S. Supardan, S. A. Kamil","doi":"10.15251/djnb.2023.183.841","DOIUrl":"https://doi.org/10.15251/djnb.2023.183.841","url":null,"abstract":"The effect of annealing temperature on the photocatalyst's structural, morphological, photocatalytic and optical properties have been extensively studied. In this work, the Cu-Ni co-doped TiO2 powder was prepared by the sol-gel technique and annealed at temperatures 400°C, 500°C, 600°C, 700°C, and 800°C. The structural phase of the Cu-Ni/TiO2 changed from anatase to rutile after the annealing temperature increased from 400°C to 800°C. The anatase phase was found at 400°C and 500°C, the mixed phase at 600 and 700°C, and the rutile phase at 800°C. The specific surface area and band gap of Cu-Ni/TiO2 were decreased with the increment of annealing temperatures from 70.00 to 24.89 m2 /g and 3.36 eV to 3.04 eV, respectively. Meanwhile, as the annealing temperature rises, the average particle size increases from 38.52 to 173.59 nm. The anatase-rutile mixed phase of Cu-Ni/TiO2 annealed at 600°C exhibited the highest photocatalytic degradation of methylene blue (MB) with 62.81% MB removal. Experimental results indicated that the annealing temperature could alter the structural, morphological, and optical properties of the Cu-Ni/TiO2, affecting the photocatalytic activity performance.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43660519","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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