Kusiak-Nejman Ewelina, Moszyński Dariusz, Kapica-Kozar Joanna, Wanag Agnieszka, Morawski Antoni W
Institute of Inorganic Technology and Environment Engineering, Faculty of Chemical Engineering, West Pomeranian University of Technology, Szczecin, Pułaskiego 10, 70-322 Szczecin, Poland.
Nanomaterials (Basel). 2018 Aug 23;8(9):647. doi: 10.3390/nano8090647.
A hybrid nanocomposites containing nanocrystalline TiO₂ and graphene-related materials (graphene oxide or reduced graphene oxide) were successfully prepared by mechanical mixing and the hydrothermal method in the high-pressure atmosphere. The presented X-ray photoelectron spectroscopy (XPS) study and quantitative elemental analysis confirm similar content of carbon in graphene oxide GO (52 wt% and 46 wt%, respectively) and reduced graphene oxide rGO (92 wt% and 98 wt%, respectively). No chemical interactions between TiO₂ and GO/rGO was found. TiO₂ nanoparticles were loaded on GO or rGO flakes. However, Fourier transform infrared-diffuse reflection spectroscopy (FTIR/DRS) allowed finding peaks characteristic of GO and rGO. XPS study shows that since the concentration of TiO₂ in the samples was no less than 95 wt%, it was assumed that the interactions between TiO₂ and graphene should not influence the lower layers of titanium atoms in the TiO₂ and they occurred as Ti ions. Hydrothermal treatment at 200 °C did not cause the reduction of GO to rGO in TiO₂-GO nanocomposites. In general, the one-step hydrothermal method must be considered to be inefficient for preparation of chemically-bonded composites synthesized from commercially available TiO₂ and unfunctionalized graphene sheets obtained from graphite powder.
通过机械混合和高压气氛下的水热法，成功制备了一种包含纳米晶TiO₂和石墨烯相关材料（氧化石墨烯或还原氧化石墨烯）的混合纳米复合材料。所呈现的X射线光电子能谱（XPS）研究和定量元素分析证实，氧化石墨烯GO中碳的含量相似（分别为52 wt%和46 wt%），还原氧化石墨烯rGO中碳的含量也相似（分别为92 wt%和98 wt%）。未发现TiO₂与GO/rGO之间存在化学相互作用。TiO₂纳米颗粒负载在GO或rGO薄片上。然而，傅里叶变换红外漫反射光谱（FTIR/DRS）能够检测到GO和rGO的特征峰。XPS研究表明，由于样品中TiO₂的浓度不低于95 wt%，因此可以认为TiO₂与石墨烯之间的相互作用不会影响TiO₂中钛原子的下层，且它们以Ti离子的形式发生。在TiO₂-GO纳米复合材料中，200℃的水热处理并未导致GO还原为rGO。总体而言，对于由市售TiO₂和从石墨粉获得的未功能化石墨烯片合成化学键合复合材料，一步水热法必须被认为是低效的。
