检索结果-南通市图书馆

Characterization of High Yield Graphene Oxide Synthesized by Simplified Hummers Method

Graphene 2017年第4期6卷 85-98页

作者： Kayode Oladele Olumurewa Bolutife Olofinjana Oladepo Fasakin marcus adebola eleruja Ezekiel Oladele Bolarinwa Ajayi Department of Physics and Engineering Physics Obafemi Awolowo University Ile-Ife Nigeria

Graphene oxide (GO) was chemically synthesized from natural flake graphite (NFG) using the simplified Hummers method. The synthesis was carried out using two routes. The first route involved stirring the one pot mixture continuously for three days at ambient temperature while the second route involved stirring another one pot mixture for six days also at ambient temperature. The two GOs were characterized using Fourier Transform Infrared Spectroscopy (FTIR), Energy Dispersive X-Ray Spectroscopy (EDX), Field Emission Scanning Electron Microscopy (FE-SEM), Raman Spectroscopy and UV-Visible Spectrometry. The FTIR spectra showed introduction of oxygen functionalities in both GO with a higher degree of oxidation in the 6-day synthesized GO while the EDX confirmed the presence of carbon and oxygen in the GOs. The SEM micrograph gave the typical wrinkle and crumpling present in the 3-day synthesized GO while the 6-day synthesized GO showed distortion in structures. The Raman spectra showed a slightly higher ID/IG ratio for the 3-day synthesized GO with the 6-day synthesized GO showing a greater disruption of the sp2 domains. The extended period of stirring and oxidation increased the band gap of the 6-day synthesized GO to 3.0 eV unlike the 3-day synthesized GO where 2.5 eV was observed.

关键词： Graphite Graphene Graphene Oxide Raman Spectroscopy Band Gap

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Synthesis and Characterization of Metal Organic Chemical Vapour Deposited Copper Titanium Oxide (Cu-Ti-O) Thin Films from Single Solid Source Precursor

引用

Journal of Modern Physics 2013年第12期4卷 1-6页

作者： Oladepo Fasakin marcus adebola eleruja Olumide Oluwole Akinwunmi Bolutife Olofinjana Emmanuel Ajenifuja Ezekiel Oladele Bolarinwa Ajayi Centre for Energy Research and Development Obafemi Awolowo University Ile-Ife Nigeria Department of Physics Obafemi Awolowo University Ile-Ife Nigeria

Thin films of copper titanium oxide were deposited by metal organic chemical vapour deposition technique from the synthesized single solid source precursor, copper titanium acetylacatonate Cu [Ti(C5H7O2)3] at the deposition temperature of 420°C. The deposited films were characterized using Rutherford Backscattering Spectroscopy, Scanning Electron Microscopy with Energy Dispersive X-Ray facility attached to it, X-Ray Diffractometry, UV-Visible Spectrometry and van-der Pauw Conductivity measurement. Results show that the thickness of the prepared film is determined as 101.236 nm and the film is amorphous in structure, having average grain size of approximately 1 μm. The optical behaviour showed that the absorption edge of the film was at 918 nm near infrared with corresponding direct energy band gap of 1.35 eV. The electrical characterization of the film gave the values of resistivity, sheet resistance and conductivity of the film as 3.43 × 10-1 Ω-cm, 3.39 × 106 Ω/square and 2.91 (Ω-cm)-1 respectively.

关键词： Thin Film Copper Titanium Oxide Metalorganic Chemical Vapour Deposition (MOCVD)

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Some Properties of Manganese Oxide （Mn-O） and Lithium Manganese Oxide （Li-Mn-O） Thin Films Prepared via Metal Organic Chemical Vapor Deposition （MOCVD） Technique

引用

材料科学与工程（中英文B版） 2015年第5期5卷 231-242页

作者： Kabir O. Oyedotun marcus adebola eleruja Bolutife Olofinjana Olumide Oluwole Akinwunmi Olusoji O.Ilori Ezekiel Omotoso Emmanuel. Ajenifuja Adetokunbo T. Famojuro Eusebius I. Obianjuwa Ezekiel Oladele Bolarlnwa Ajay Department of Physics and Engineering Physics Obafemi Awolowo University lle-Ife 220005 Nigeria Department of Electronic and Electrical Engineering Obafemi Awolowo University Ile-Ife 220005 Nigeria Centre for Energy Research and Development Obafemi Awolowo University Ile-lfe 220005 Nigeria Department of Chemistry Obafemi Awolowo University Ile-Ife 220005 Nigeria

Single solid source precursors, Manganese acetylacetonate (Mn[C5H7O2]2) and Lithium manganese acetylacetonate (Li-Mn[C5H7O2]3) were prepared and thin films of Mn-O and Li-Mn-O were deposited on sodalime glass substrates using MOCVD (Metal organic chemical vapour deposition) technique by pyrolysing Mn[C5H7O2]2 and Li-Mn[C5H7O2]3 respectively at a temperature of 420 °C for approximately 2 h. The films were characterized using RBS (Rutherford backscattering spectroscopy), SEM (Scanning electron microscopy), XRD (X-ray diffraction), van der Pauw method and Ultraviolet-Visible Spectroscopy. The compositional analysis showed that the Mn: O ratio is 0.2:0.8 while that of Li: Mn: O was found to be 0.47:0.24:0.29. SEM micrograph showed that Mn-O film is composed of hollow needle-like rods with coarse, continuous and uniformly distributed polycrystalline grains rod-like, having average grain size estimated to be below 10μm while those of Li-Mn-O showed that the film is dendritic and polycrystalline in which some of the grains were found to lump together. XRD also showed the polycrystalline nature of the films with orthorhombic MnO2 and orthorhombic Li3MnO4 structures for Mn-O and Li-Mn-O thin films respectively. Results of characterization also showed that the films are semiconducting, highly absorbing in the visible region with absorption edges observed at wavelengths of 525 nm and 550 nm, corresponding to direct optical band gaps of 2.36 eV and 2.25eV for Mn-O and Li-Mn-O thin films respectively.

关键词：金属有机化学气相沉积锂锰氧化物薄膜沉积 MOCVD 制备技术性质紫外可见光谱

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：