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":"89 1","pages":"0"},"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":"40 1","pages":"0"},"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.2023.183.1039
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":"21 1","pages":"0"},"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":"25 1","pages":"0"},"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 : 2023-09-20DOI: 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":"29 1","pages":"0"},"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 : 2023-07-20DOI: 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":" ","pages":""},"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}
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":" ","pages":""},"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.2023.183.813
H. W. Zhao, Yang Li, R. Zhao, Z. Li
(K0.48Na0.52)NbO3-0.03Bi0.5Na0.5ZrO3 (KNNS-0.03BNZ) ceramics were prepared doped with 3 mol% Bi0.5Na0.5ZrO3 (BNZ), and the effect of sintering temperature on dielectric and piezoelectric properties of KNNS-0.03BNZ was also investigated. KNNS-0.03BNZ ceramics at all sintering temperatures exhibit a single perovskite structure, and the change of sintering temperature has no significant effect on the phase composition of KNNS 0.03BNZ ceramics. The Raman shifts of the ν1 and ν5 vibration modes have irregular changes in all sintering temperature ranges, indicating that there are polycrystalline phases coexisting in this region. With the change of sintering temperature, Tc slightly shifts to the high temperature direction, and TR-T slightly shifts to the high temperature direction, dielectric constant εr continuously increases, while dielectric loss tanδ firstly decreasing and then increasing. Thanks to the presence of a small amount of liquid phase in the ceramics sintered at 1160 ℃, piezoelectric coefficient d33 reaches 280 pC/N.
{"title":"Effect of sintering temperature on the structure and electrical properties of KNNS-0.03BNZ ceramics","authors":"H. W. Zhao, Yang Li, R. Zhao, Z. Li","doi":"10.15251/djnb.2023.183.813","DOIUrl":"https://doi.org/10.15251/djnb.2023.183.813","url":null,"abstract":"(K0.48Na0.52)NbO3-0.03Bi0.5Na0.5ZrO3 (KNNS-0.03BNZ) ceramics were prepared doped with 3 mol% Bi0.5Na0.5ZrO3 (BNZ), and the effect of sintering temperature on dielectric and piezoelectric properties of KNNS-0.03BNZ was also investigated. KNNS-0.03BNZ ceramics at all sintering temperatures exhibit a single perovskite structure, and the change of sintering temperature has no significant effect on the phase composition of KNNS 0.03BNZ ceramics. The Raman shifts of the ν1 and ν5 vibration modes have irregular changes in all sintering temperature ranges, indicating that there are polycrystalline phases coexisting in this region. With the change of sintering temperature, Tc slightly shifts to the high temperature direction, and TR-T slightly shifts to the high temperature direction, dielectric constant εr continuously increases, while dielectric loss tanδ firstly decreasing and then increasing. Thanks to the presence of a small amount of liquid phase in the ceramics sintered at 1160 ℃, piezoelectric coefficient d33 reaches 280 pC/N.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48887558","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.2023.183.821
T. Khan, E. H. Mirza, N. J. Kurd, M. Naushad, M. U. Ul Haque
In this study, a novel composite is fabricated by incorporating Polyvinyl alcohol (PVA) and Bio-Glass (BG) via the freeze-thaw method. PVA pre-polymer is prepared in three different concentrations i.e. (2%, 5%, and 10%) by dissolving PVA powder in distilled water by using a hot plate magnetic stirrer at 80° C, and a constant concentration of BG i.e 2% is added into each PVA prepolymer. Total six specimens including (PVA (2%), PVA (5%), PVA (10%), PVA (2%)/BG (2%), PVA (5%)/BG (2%), and PVA (10%)/ BG (2%) were prepared in which pure PVA specimens acts as a control group. The physicochemical and mechanical properties of the specimens were examined. Various characterization tests such as scanning electron microscopy (SEM), swelling analysis, degradability analysis, hygroscopicity, pH sensitivity, tensile analysis, gel fraction test, water vapor transmission rate (WVTR), and, contact angle analysis were performed on the samples. SEM analysis showed that with the increase in PVA concentration, the material becomes smoother and more compact. Results from the current study showed that tensile strength, degradation rate, and get content are directly proportional to PVA concentration, while swelling capacity, pH sensitivity, hygroscopicity, WVTR, and hydrophilicity are inversely related to PVA concentration. Moreover, with the addition of BG, tensile strength, degradation rate, pH sensitivity, swelling capability, hydrophilicity, and, gel content of the specimens is increased, whereas, WVTR is decreased and, hygroscopicity remains unchanged. Furthermore, results from this study must be taken a step ahead & biocompatibility must be tested to evaluate the biological performance.
{"title":"Fabrication and in vitro evaluation of polyvinyl alcohol/bio-glass composite for potential wound healing applications","authors":"T. Khan, E. H. Mirza, N. J. Kurd, M. Naushad, M. U. Ul Haque","doi":"10.15251/djnb.2023.183.821","DOIUrl":"https://doi.org/10.15251/djnb.2023.183.821","url":null,"abstract":"In this study, a novel composite is fabricated by incorporating Polyvinyl alcohol (PVA) and Bio-Glass (BG) via the freeze-thaw method. PVA pre-polymer is prepared in three different concentrations i.e. (2%, 5%, and 10%) by dissolving PVA powder in distilled water by using a hot plate magnetic stirrer at 80° C, and a constant concentration of BG i.e 2% is added into each PVA prepolymer. Total six specimens including (PVA (2%), PVA (5%), PVA (10%), PVA (2%)/BG (2%), PVA (5%)/BG (2%), and PVA (10%)/ BG (2%) were prepared in which pure PVA specimens acts as a control group. The physicochemical and mechanical properties of the specimens were examined. Various characterization tests such as scanning electron microscopy (SEM), swelling analysis, degradability analysis, hygroscopicity, pH sensitivity, tensile analysis, gel fraction test, water vapor transmission rate (WVTR), and, contact angle analysis were performed on the samples. SEM analysis showed that with the increase in PVA concentration, the material becomes smoother and more compact. Results from the current study showed that tensile strength, degradation rate, and get content are directly proportional to PVA concentration, while swelling capacity, pH sensitivity, hygroscopicity, WVTR, and hydrophilicity are inversely related to PVA concentration. Moreover, with the addition of BG, tensile strength, degradation rate, pH sensitivity, swelling capability, hydrophilicity, and, gel content of the specimens is increased, whereas, WVTR is decreased and, hygroscopicity remains unchanged. Furthermore, results from this study must be taken a step ahead & biocompatibility must be tested to evaluate the biological performance.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43524605","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.2023.183.793
S. Abbas, E. Hassan, O. Abdulmunem
In this study, RF-sputtering was used to hydrothermally produce zinc oxide nanorods (ZnO NRs) on the seed layer of ZnO/Glass substrates. at different thicknesses (t1 = 1135 nm, t2 = 1306 nm, t3 = 1437 nm, t4 = 1533 nm). The structural properties were studied by X-ray diffraction, which showed that ZnO NRs and the seed layer films are polycrystalline with the same preferred reflection for the (002) plane, and the grain size of the seed layer ranges between 19.51 nm and 30.45 nm for thicknesses t1 and t4, respectively. The measurements of the FESEM showed aspect ratios for ZnO NRs ranging from 3.03 for t1 to 4.9 for t4, with growth in different shapes: ZnO NR rods for t1, flowers and rod-like shapes for thicknesses of t2 and t3, and hexagonal-rod-like shapes in t4. Optical measurements showed a decrease in the transmittance and an increase in the energy gap values with increasing thickness.
{"title":"The difference in the type of zinc oxide nanostructures depending on the growth layer","authors":"S. Abbas, E. Hassan, O. Abdulmunem","doi":"10.15251/djnb.2023.183.793","DOIUrl":"https://doi.org/10.15251/djnb.2023.183.793","url":null,"abstract":"In this study, RF-sputtering was used to hydrothermally produce zinc oxide nanorods (ZnO NRs) on the seed layer of ZnO/Glass substrates. at different thicknesses (t1 = 1135 nm, t2 = 1306 nm, t3 = 1437 nm, t4 = 1533 nm). The structural properties were studied by X-ray diffraction, which showed that ZnO NRs and the seed layer films are polycrystalline with the same preferred reflection for the (002) plane, and the grain size of the seed layer ranges between 19.51 nm and 30.45 nm for thicknesses t1 and t4, respectively. The measurements of the FESEM showed aspect ratios for ZnO NRs ranging from 3.03 for t1 to 4.9 for t4, with growth in different shapes: ZnO NR rods for t1, flowers and rod-like shapes for thicknesses of t2 and t3, and hexagonal-rod-like shapes in t4. Optical measurements showed a decrease in the transmittance and an increase in the energy gap values with increasing thickness.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46892063","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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