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Study of High field conduction in Se based Chalcogenide glasses 硒基硫系玻璃的高场导电性研究
IF 1.1 Pub Date : 2022-07-01 DOI: 10.15251/jobm.2022.143.129
N. Yaduvanshi
The present work reports the study of high field conduction in thin films of Se90Ge10-x Inx (x=2,6) because high field conduction in chalcogenide glasses is affected by the presence of localised states at the band edges as well as the defect states present in the mobility gap.To measure the density of states in these thin films , space charge limited conduction technique is used. I-V characteristics have been measured at various fixed temperatures. An ohmic behaviour is observed at low electric fields upto 102V/cm. Superohmic behaviour is observed at high electric fields (103 -104 V/cm).High field conduction theory of space charge limited conduction for uniform distribution of localised states in the mobility gap fits well with the experimental data.Using this theory, the density of defect states near Fermi level is calculated for all glassy alloys.
本文报道了Se90Ge10-x Inx (x=2,6)薄膜中的高场导电性,因为硫系玻璃中的高场导电性受到带边缘局域态的存在以及迁移率间隙中存在的缺陷态的影响。为了测量这些薄膜的态密度,采用了空间电荷限制传导技术。在不同的固定温度下测量了I-V特性。在低至102V/cm的电场中观察到欧姆行为。在高电场(103 -104 V/cm)下观察到超高压行为。在迁移率间隙中局域态均匀分布的空间电荷限制高场传导理论与实验数据吻合良好。利用这一理论,计算了所有玻态合金在费米能级附近的缺陷态密度。
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引用次数: 0
Enhanced photocatalytic degradation of Gd-doped Bi2O3 for selective dyes under UV light irradiation 紫外光照射下Gd掺杂Bi2O3对选择性染料的光催化降解
IF 1.1 Pub Date : 2022-07-01 DOI: 10.15251/jobm.2022.143.77
E. Dhanasekaran, N. Sivakumar, N. Sriharan
Nanorod like structured bare Bi2O3 and Gd-doped Bi2O3 (Gd-Bi2O3) are synthesized by simple hydrothermal method. The crystal structure, compositions and surface morphology of the synthesized nanoparticles are characterized by X-ray powder diffraction (XRD), Scanning electron microscopy (SEM), Energy Dispersive X-ray spectroscopy (EDS) and UV-visible absorbance spectroscopy (UV). The photocatalytic efficiency of as synthesized samples is evaluated by degradation of aqueous solution of dyes from different classes under the pH = 4, 6, 8 in presence of UV light. Comparatively, Gd-Bi2O3 exhibits significant degradation of dye stuffs than bare Bi2O3. In our present study, the factors which are emphasis the photocatalytic activity of Gd-Bi2O3 and possible mechanism for photocatalytic degradation also narrated briefly.
采用简单水热法合成了纳米棒状结构裸Bi2O3和gd掺杂Bi2O3 (Gd-Bi2O3)。采用x射线粉末衍射(XRD)、扫描电子显微镜(SEM)、x射线能谱(EDS)和紫外可见吸收光谱(UV)对合成的纳米颗粒的晶体结构、组成和表面形貌进行了表征。通过在pH = 4、6、8的紫外光作用下对不同类别染料水溶液的降解,评价了合成样品的光催化效率。与裸Bi2O3相比,Gd-Bi2O3对染料有明显的降解作用。本文简要介绍了影响Gd-Bi2O3光催化活性的主要因素及可能的光催化降解机理。
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引用次数: 0
ZnO nanoparticles and their properties as surface coating materials against coronavirus: viewpoint ZnO纳米颗粒及其作为冠状病毒表面涂层材料的性能:观点
IF 1.1 Pub Date : 2022-04-01 DOI: 10.15251/jobm.2022.142.53
H. Idriss, M. Habib, A. Alakhras, H. M. El Khair
A pandemic of coronavirus infection is causing a significant public health hazard globally, putting millions of people at risk in an increasing amount of countries. Nanostructured materials have been recognized to be highly efficient against coronaviruses. ZnO nanoparticles possess unique features that enable to act as anti-bacterial and anti-viral. Hence, the aim of the current investigation is to produce zinc oxide nanoparticles and utilized as surface coating materials against COVID-19. Thermal decomposition has been utilized in this investigation to fabricate ZnO nanoparticles with crystallite of 41 and 55 nm. The study outcomes demonstrated that Zinc nanoparticles is a favorable material for future usage as an anti-coronavirus surface due to their ecologically friendly features and exceptional physical and chemical functionality.
冠状病毒感染大流行正在全球造成重大公共卫生危害,使越来越多的国家的数百万人面临风险。纳米结构材料已被认为是对抗冠状病毒的高效材料。氧化锌纳米颗粒具有独特的抗菌和抗病毒功能。因此,本研究的目的是制备氧化锌纳米颗粒,并将其用作抗COVID-19的表面涂层材料。本研究利用热分解法制备了41 nm和55 nm的ZnO纳米颗粒。研究结果表明,锌纳米颗粒由于其生态友好的特性和卓越的物理和化学功能,是未来用作抗冠状病毒表面的有利材料。
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引用次数: 1
Antibacterial activity of biosynthesized ZnO nanoflakes using Pandanus tectorius leaf extracts 虎芋叶提取物生物合成ZnO纳米片的抑菌活性研究
IF 1.1 Pub Date : 2022-04-01 DOI: 10.15251/jobm.2022.142.35
S. Florence, C. Manna, K. Prabha, M. Bakri, R. A. Hagazy, M. Sowjanya, M. Shariq
The crystalline structure and morphology of semiconductor nanoparticles are important factors for determining their optical properties. To synthesis such nanoparticles, green synthesis is one of the most popular methods. In these green synthesis procedures, the plant extracts can be added to control the growth and particle size. In this present work, ZnO nanoflakes are synthesized in a cost-effective green synthsis method using pandamus tecctorius leaf extract. The structure and morphology of as synthesized ZnO nanoflakes have been characterized by X-ray diffraction (XRD), Raman Spectroscopy, scanning electron microscopy (SEM), photoluminescence (PL) spectrophotometry and transmission electron microscopy (TEM). The SEM and TEM images reveal the formation of ZnO nanoflakes. The hexagonal wurtzite structure has been predicted from XRD results. Strong blue absorption and the enhanced luminescence property with respect to bulk have been observed from PL studies.
半导体纳米粒子的晶体结构和形貌是决定其光学性能的重要因素。绿色合成是合成此类纳米粒子最常用的方法之一。在这些绿色合成过程中,可以添加植物提取物来控制生长和颗粒大小。本研究以菖蒲叶提取物为原料,采用经济高效的绿色合成方法合成了氧化锌纳米片。采用x射线衍射(XRD)、拉曼光谱(Raman Spectroscopy)、扫描电子显微镜(SEM)、光致发光(PL)分光光度法和透射电子显微镜(TEM)对合成的ZnO纳米片的结构和形貌进行了表征。SEM和TEM图像显示ZnO纳米片的形成。通过XRD结果预测了六方纤锌矿结构。从PL研究中观察到强蓝光吸收和相对于体积增强的发光特性。
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引用次数: 0
Synthesis, characterization with optical property of Zn-O NPs using sol-gel route in alkaline medium 碱性介质中溶胶-凝胶法合成Zn-O纳米颗粒及其光学性能
IF 1.1 Pub Date : 2022-04-01 DOI: 10.15251/jobm.2022.142.69
D. Tamilselvi, N. Velmani, K. Rathidevi, V. Geethalakshmi, R. Nandhini
Zn-O nanoparticles were successfully synthesized by sol-gel route using ZnSO4.7H2O as precursor in alkaline medium. Structural, morphological and optical property of Zn-O NPs was analyzed. Zn-O NPs were characterized by using X-ray diffraction (XRD), Fourier transform infrared spectral (FTIR), UV-Visible spectrophotometer, scanning electron microscopy (SEM) and Energy Dispersive X-ray analysis (EDAX).XRD pattern shows the purity of synthesized Zn-O nanoparticles particle size. Scanning electron microscopy (SEM) observations revealed remarkable change in morphological structure of Zn-O NPs. Analysis studies was confirmed, the functional groups and chemical bonding present in the synthesized Zn-O nanoparticles.
以ZnSO4.7H2O为前驱体,在碱性介质中通过溶胶-凝胶法成功合成了Zn-O纳米颗粒。分析了Zn-O纳米颗粒的结构、形态和光学性质。利用X射线衍射(XRD)、傅立叶变换红外光谱(FTIR)、紫外可见分光光度计、扫描电子显微镜(SEM)和能量分散X射线分析(EDAX)对Zn-O纳米粒子进行了表征。扫描电子显微镜(SEM)观察显示Zn-O NPs的形态结构发生了显著变化。分析研究证实了合成的Zn-O纳米颗粒中存在的官能团和化学键。
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引用次数: 0
Synthesis and characterization of new solid polymer electrolyte (PEG + CH3COONa) for solid-state sodium batteries 固态钠电池用新型固体聚合物电解质(PEG + CH3COONa)的合成与表征
IF 1.1 Pub Date : 2022-04-01 DOI: 10.15251/jobm.2022.142.63
A. Polu, V. Mekala, T. Ramesh
Using the solution-cast approach, new solid polymer electrolyte films containing sodium acetate (CH3COONa) in poly (ethylene glycol) were prepared. These polymer electrolyte systems have been characterized using a variety of experimental approaches, including temperature-dependent conductivity and DSC. The endothermic peak at 59.42°C, which corresponds to the melting temperature of pure PEG, is revealed by DSC measurements. Due to the addition of salt to the polymer, a minor movement in the melting point, Tm, towards lower temperatures has been detected. At 30°C, the 80PEG+20CH3COONa electrolyte system had a maximum conductivity of 7.9 × 10-6 S/cm. When compared to pure PEG, the conductivity enhanced by two orders of magnitude. The magnitude of conductivity increased as the temperature raised.
采用溶液浇铸法,制备了含有醋酸钠(CH3COONa)和聚乙二醇的新型固体聚合物电解质膜。这些聚合物电解质系统已经使用各种实验方法进行了表征,包括温度相关的电导率和DSC。DSC测量显示,59.42°C处的吸热峰对应于纯PEG的熔融温度。由于向聚合物中添加了盐,已经检测到熔点Tm向较低温度的微小移动。在30°C下,80PEG+20CH3COONa电解质体系的最大电导率为7.9×10-6S/cm。与纯PEG相比,电导率提高了两个数量级。电导率的大小随着温度的升高而增加。
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引用次数: 2
DSSCs based on ZnO photoelectrodes sensitized with natural dyes extracted from the bark of Brazil and Taray 基于用从巴西和Taray树皮中提取的天然染料敏化的ZnO光电极的DSSC
IF 1.1 Pub Date : 2022-04-01 DOI: 10.15251/jobm.2022.142.29
A. G. Flota Robledo, J. Pantoja Enríquez, C. A. Meza Avendaño, G. Pérez Hernández, P. J. Juárez Gutiérrez
We report the extraction of natural dyes from Brazil and Taray bark, the impregnation of these dyes in thin films of ZnO synthesized via sol-gel method and deposited by Doctor Blade and finally the fabrication of dye sensitized solar cells (DSSC). The ZnO/dyes structures were characterized using UV-Visible and infrared spectroscopy. The analysis of the infrared spectra shows that the semiconductors impregnated with the extracted dyes exhibit the characteristic of dye anchorage in ZnO. The photovoltaic performance and efficiency of the assembled DSSCs was evaluated.
我们报道了从巴西和Taray树皮中提取天然染料,将这些染料浸渍在通过溶胶-凝胶法合成并由Doctor Blade沉积的ZnO薄膜中,最后制备染料敏化太阳能电池(DSSC)。利用紫外可见光谱和红外光谱对ZnO/染料的结构进行了表征。红外光谱分析表明,用提取的染料浸渍的半导体在ZnO中表现出染料锚定的特性。对组装的DSSC的光伏性能和效率进行了评估。
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引用次数: 1
Synthesis of PVA-Fe2O3-TiO2 hybrid structure for biomedical application 生物医学用PVA-Fe2O3-TiO2杂化结构的合成
IF 1.1 Pub Date : 2022-04-01 DOI: 10.15251/jobm.2022.142.43
H. M. A. Algelal, S. Kareem, K. A. Mohammed, E. J. Khamees, A. S. Abed, A. H. Alkhayatt, R. R. Al-Okbi
This work investigates the structure, morphology, and optical properties of TiO2 nanoparticles embedded in a Fe2O3–PVA composite matrix. The samples were examined using a variety of techniques, including field-emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), absorption and transmission spectra, and Fourier transformation infrared (FTIR). Crystallography information revealed the presence of TiO2 doesn’t effect in the crystal structure of PVA-Fe2O3. The manufactured composites demonstration strong absorption in the range of 440–570 nm. It is important that the highest absorption of these composites gradually shifted to the shorter wavelength region with presence of TiO2. PVA-Fe2O3 is highly transparent with transmittance of around 85 % in range 600-800 nm. After addition of 2.5 % by weight of TiO2 nanoparticles, the transmittance of nanocomposite drops to 75% in the same range of wavelength . Further addition of nanoparticles reduced the percentage transmittance to 68%. The results specify that as the TiO2 ratio increases, the band gap be wider.
本工作研究了嵌入Fe2O3–PVA复合基体中的TiO2纳米颗粒的结构、形态和光学性能。使用多种技术对样品进行了检查,包括场发射扫描电子显微镜(FESEM)、X射线衍射(XRD)、吸收和透射光谱以及傅里叶变换红外光谱(FTIR)。晶体学信息显示TiO2的存在对PVA-Fe2O3的晶体结构没有影响。制造的复合材料在440–570 nm范围内表现出较强的吸收能力。重要的是,随着TiO2的存在,这些复合材料的最高吸收逐渐转移到较短的波长区域。PVA-Fe2O3是高度透明的,在600-800nm的范围内具有约85%的透射率。在加入2.5重量%的TiO2纳米颗粒后,在相同波长范围内,纳米复合材料的透射率降至75%。进一步添加纳米颗粒将透射率百分比降低到68%。结果表明,随着TiO2比例的增加,带隙变宽。
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引用次数: 1
Transparent glass coated with silver colloid nanoparticles candidate as an antiCoronavirus surface - Perspective 涂覆银胶体纳米粒子的透明玻璃作为抗冠状病毒表面的候选材料——展望
IF 1.1 Pub Date : 2022-01-01 DOI: 10.15251/jobm.2022.141.19
A. Alakhras, H. M. El Khair, M. Habib, T. Odeh, H. Idriss
Silver nanoparticles have a wide range of anti-bacterial, anti-fungal, and anti-viral effects due to their unique properties. In this work, citrate reduction has been employed to fabricate silver colloidal nanoparticles with 12 nm. The plasmon resonance spectra of nanoscopic silver particles adsorbed onto transparent electrodes in contact with various electrolyte solutions and concentrations of NaC1O4, KPF6, and NaCl were studied. Potentials were controlled with a galvanostat, and UV/visible spectrophotometer was employed to obtain the optical spectra. The results showed the electrolyte identity, potential-induced redshifts, and damping is most pronounced for NaCl, whereas spectral changes are weaker in the cases of NaC1O4 and KPF6 solutions. Hence, due to the noble physical and biological properties of silver colloid nanoparticles, it becomes a great candidate and promising in the future to be used as an anti-coronavirus surface.
银纳米粒子由于其独特的特性,具有广泛的抗菌、抗真菌和抗病毒作用。在这项工作中,柠檬酸盐还原已经被用于制备12nm的银胶体纳米颗粒。研究了吸附在透明电极上的纳米银颗粒在不同电解质溶液和NaC1O4、KPF6和NaCl浓度下的等离子体共振光谱。用恒电流计控制电势,并使用紫外/可见光分光光度计获得光谱。结果表明,NaCl的电解质特性、电位诱导的红移和阻尼最为明显,而NaC1O4和KPF6溶液的光谱变化较弱。因此,由于银胶体纳米颗粒具有崇高的物理和生物特性,它成为一种很好的候选物,在未来很有前景用作抗冠状病毒表面。
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引用次数: 0
Synthesis, characterization and applications of sodium alginate and polyvinyl pyrollidine based clay reinforced biopolymers nanocomposites 海藻酸钠和聚乙烯醇软酯基粘土增强生物聚合物纳米复合材料的合成、表征及应用
IF 1.1 Pub Date : 2022-01-01 DOI: 10.15251/jobm2022.1411
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引用次数: 0
期刊
Journal of Optoelectronic and Biomedical Materials
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