基于SERS的rGO-TiO_2纳米复合体的电荷转移研究
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摘要
在还原的氧化石墨烯(rGO)和TiO_2纳米复合体(rGO-TiO_2)中,rGO与TiO_2之间强烈的界面相互作用赋予了该复合体在实际应用中优异的性能。目前为止,对于如何提高rGO-TiO_2纳米复合体实际应用效率的主要理论基础还没有得到充分的探索。采用一种简单且传统的方法制备出rGO-TiO_2纳米复合体,并且,通过表面增强拉曼散射光谱(SERS)作为探测手段,4-MBA作为探针分子,来探测所制备的纳米复合体界面处的电荷转移(CT)过程。结果显示,由于rGO-TiO_2纳米复合材料中接触界面的改变,使得界面处发生CT过程,并且随着rGO量的增加,rGO-TiO_2和4-MBA组装体系统中的CT度随之增加。
In the reduced graphene oxide(rGO)-TiO_2 nanocomposite,the strong interfacial interaction between rGO and TiO_2 confers a broad prospect for this complex in basic research and industrial applications.However,so far,the main oretical basis for how to improve the practical application efficiency of rGO-TiO_2 nanocomposite has not been fully explored.Based on this,this article adopts a simple and traditional method to prepare the rGO-TiO_2 nanocomposite.Moreover,the surface enhanced Raman scattering spectrum(SERS)was used as the detection method and 4-MBA as a probe molecule to detect the charge transfer(CT)process at the nanocomposite interface.The result shows that due to the change of the contact interface in the rGOTiO_2 nanocomposites,the CT process occurs at the interface and the CT degree of the 4-MBA@rGO-TiO_2 system increases with the increase of rGO.
In the reduced graphene oxide(rGO)-TiO_2 nanocomposite,the strong interfacial interaction between rGO and TiO_2 confers a broad prospect for this complex in basic research and industrial applications.However,so far,the main oretical basis for how to improve the practical application efficiency of rGO-TiO_2 nanocomposite has not been fully explored.Based on this,this article adopts a simple and traditional method to prepare the rGO-TiO_2 nanocomposite.Moreover,the surface enhanced Raman scattering spectrum(SERS)was used as the detection method and 4-MBA as a probe molecule to detect the charge transfer(CT)process at the nanocomposite interface.The result shows that due to the change of the contact interface in the rGOTiO_2 nanocomposites,the CT process occurs at the interface and the CT degree of the 4-MBA@rGO-TiO_2 system increases with the increase of rGO.
引文
[1] Ye Zongbiao,Tai Huiling,Xie Tao,et al.Sensors and Actuators B,2016,223:149.
[2] John R Lombardi,Ronald L Birke.J.Phys.Chem.C,2008,112:5605.
[2] John R Lombardi,Ronald L Birke.J.Phys.Chem.C,2008,112:5605.