独立式碳纳米管-二氧化钛光活性片材
Free-standing carbon nanotube-titania photoactive sheets.
作者信息
Koo Youngmi, Malik Rachit, Alvarez Noe, Shanov Vesselin N, Schulz Mark, Sankar Jag, Yun Yeoheung
机构信息
Engineering Research Center, Department of Chemical, Biological, and Bio Engineering, North Carolina A&T State University, Greensboro, NC 27411, USA.
Department of Chemical and Materials Engineering, University of Cincinnati, Cincinnati, OH 45221, USA.
出版信息
J Colloid Interface Sci. 2015 Jun 15;448:148-55. doi: 10.1016/j.jcis.2015.02.022. Epub 2015 Feb 14.
We report on the development of a new photoactive material via titania (TiO2) nanoparticle deposition on free-standing aligned carbon nanotube (CNT) sheets. Controlling homogeneous dispersion of negatively charged TiO2 nanoparticles, achieved by adjusting pH higher than the point of zero charge (PZC), influenced electrochemical deposition of TiO2 on CNT sheets substrate. Varying deposition time with constant voltage, 5 V allowed different thickness of TiO2 to be deposited layer on the CNT sheets. The thickness and morphology of CNT-TiO2 sheets was verified by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD). Electrochemical experiments show that diffusion coefficient of Fe(CN)6(3-) was 5.56×10(-6) cm(2) s(-1) at pristine CNT sheets and 2.19×10(-6) cm(2) s(-1) at the CNT-TiO2 sheets. Photocatalytic activity for CNT-TiO2 sheets exhibits high photocurrent density (when deposition time=30 min, 4.3 μA cm(-2) in N2, 13.4 μA cm(-2) in CO2). This paper proved a possibility to use CNT-TiO2 sheets based on highly-aligned CNT sheets substrate as new photoactive material.
我们报道了一种通过在独立排列的碳纳米管（CNT）片材上沉积二氧化钛（TiO₂）纳米颗粒来开发新型光活性材料的方法。通过将pH值调节至高于零电荷点（PZC）来控制带负电荷的TiO₂纳米颗粒的均匀分散，这会影响TiO₂在CNT片材基底上的电化学沉积。在恒定电压5V下改变沉积时间，可以在CNT片材上沉积不同厚度的TiO₂层。通过扫描电子显微镜（SEM）、能量色散X射线光谱（EDS）和X射线衍射（XRD）对CNT-TiO₂片材的厚度和形态进行了验证。电化学实验表明，在原始CNT片材上Fe(CN)₆³⁻的扩散系数为5.56×10⁻⁶ cm² s⁻¹，在CNT-TiO₂片材上为2.19×10⁻⁶ cm² s⁻¹。CNT-TiO₂片材的光催化活性表现出高光电流密度（当沉积时间 = 30分钟时，在N₂中为4.3 μA cm⁻²，在CO₂中为13.4 μA cm⁻²）。本文证明了基于高度排列的CNT片材基底的CNT-TiO₂片材作为新型光活性材料的可能性。
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