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Effect of Morphology of Titanium Dioxide Nanoparticles on Photocatalytic Activity

机译：二氧化钛纳米粒子形态对光催化活性的影响

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Dispersing nanoparticles into the matrix is a simple but effective method to improve properties of coating layer.Titanium dioxide (TiO2),known for its photocatalytic activity (PCA) to degrade organic substances and to protect microbial infection,is considered to be potential candidate.However,intense light is required to achieve high PCA.Scattering layer composing of hollow TiO2 nanoparticles,known as light harvester in solar cell devices,may be suitable for photocatalysis at lower light intensity.In this work,we studied the effect of hollow morphology to the PCA of TiO2 nanoparticles.Hollow TiO2 nanoparticles were successfully synthesized using hard-template-assisted sol-gel method.Transmission Electron Microscope (TEM) images show hollow TiO2 nanoparticles possessing 125-nm hollow core and 50-nm TiO2 shell.X-ray Diffraction (XRD) results revealed no crystalline peak for both calcined and non-calcined samples,but difference for each sample was reported by Ultraviolet-Visible Diffuse Reflectance Spectroscopy (UV-DRS).UV-DRS spectrum showed the higher diffuse reflectance for both hollow TiO2 samples than the dense counterpart,suggesting multiple light scattering and high reflection.However,energy bandgaps of amorphous and calcined hollow TiO2 samples are higher than dense counterparts.
机译：将纳米颗粒分散到基质中是一个简单而有效的方法来改善涂布layer.Titanium氧化钛（TiO2），其光催化活性（PCA）来降解的有机物质，并保护微生物感染已知的特性，被认为是潜在的candidate.However时，需要强的光，以实现高PCA.Scattering层中空TiO 2纳米颗粒，被称为太阳能电池装置的光采集器的构成，可以适用于光催化在较低光intensity.In这项工作中，我们研究了中空形态的效果的二氧化钛nanoparticles.Hollow TiO 2纳米颗粒的PCA使用成功地合成硬模板辅助溶胶 - 凝胶method.Transmission电子显微镜（TEM）图像示出中空TiO 2纳米颗粒具有125纳米的中空芯和50纳米的TiO 2 shell.X射线衍射（XRD）结果显示两种煅烧和非煅烧的样品没有发现结晶峰，但是对于每个样品差异通过紫外光可见光的扩散 - [R报道eflectance光谱（UV-DRS）.UV-DRS光谱显示两个中空的TiO2样品较密对应较高的漫反射率，表明多个光散射和高reflection.However，无定形的和煅烧的TiO 2中空样本的能带隙比致密更高同行。

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