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Investigation of physicochemical and electrical properties of $$\hbox {TiO}_{{2}}$$TiO2 nanotubes/graphene oxide nanocomposite
Bulletin of Materials Science ( IF 1.8 ) Pub Date : 2020-04-10 , DOI: 10.1007/s12034-020-2072-1
Marwa Hamandi , Mohamed Triki , Jordi Llorca , Fethi Jomni , Nuhad Aalomair , Hafedh Kochkar

Graphene oxide (GO)-based nanocomposites have received a great attention due to their emerging applications. Here, we thoroughly examined the structural, electronic and surface properties of $$\hbox {GO}/\hbox {TiO}_{2}$$ nanotubes nanocomposite. The nanocomposite is prepared by simple impregnation of $$\hbox {TiO}_{2}$$ nanotubes (HNT400) with GO dispersion. GO is elaborated by an improved Hummer’s method, while HNT400 is obtained using alkaline hydrothermal treatment of $$\hbox {TiO}_{2}$$ P25, followed by calcination at $$400^{\circ }\hbox {C}$$. XRD and Raman analyses show that GO nanosheets do not change the structural properties of $$\hbox {TiO}_{2}$$ nanotubes. TEM analysis confirms the formation of GO nanosheets assembled to $$\hbox {TiO}_{2}$$ nanotubes. XPS and EPR results confirm the electron transfer between GO and $$\hbox {TiO}_{2}$$ nanotubes. PL analysis reveals that GO inhibits the recombination of photogenerated electron–hole pairs in the nanocomposite. The ac conductivity measurements suggest the presence of grain and grain boundary effects in GO/HNT400.

中文翻译:

$$\hbox {TiO}_{{2}}$$TiO2纳米管/氧化石墨烯纳米复合材料的理化和电学性质研究

基于氧化石墨烯(GO)的纳米复合材料因其新兴的应用而受到极大关注。在这里,我们彻底检查了 $$\hbox {GO}/\hbox {TiO}_{2}$$ 纳米管纳米复合材料的结构、电子和表面特性。纳米复合材料是通过用 GO 分散体简单浸渍 $$\hbox {TiO}_{2}$$ 纳米管(HNT400)来制备的。GO 是通过改进的 Hummer 方法精心制作的,而 HNT400 是使用 $$\hbox {TiO}_{2}$$ P25 的碱性水热处理,然后在 $$400^{\circ }\hbox {C}$ 下煅烧获得的$. XRD 和拉曼分析表明,GO 纳米片不会改变 $$\hbox {TiO}_{2}$$ 纳米管的结构特性。TEM 分析证实了组装到 $$\hbox {TiO}_{2}$$ 纳米管上的 GO 纳米片的形成。XPS 和 EPR 结果证实了 GO 和 $$\hbox {TiO}_{2}$$ 纳米管之间的电子转移。PL 分析表明,GO 抑制了纳米复合材料中光生电子-空穴对的复合。交流电导率测量表明 GO/HNT400 中存在晶粒和晶界效应。
更新日期:2020-04-10
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