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用于增强光催化活性的CuO/TiO纳米管结的光还原途径。

Photoreduction route for CuO/TiO nanotubes junction for enhanced photocatalytic activity.

作者信息

Pham Van Viet, Bui Dai Phat, Tran Hong Huy, Cao Minh Thi, Nguyen Tri Khoa, Kim Yong Soo, Le Van Hieu

机构信息

Nanomaterials for Environmental Applications Laboratory, Faculty of Materials Science and Technology, University of Science, VNU-HCMC Ho Chi Minh City 700000 Vietnam

CM Thi Laboratory, Ho Chi Minh City University of Technology (HUTECH) Ho Chi Minh City 700000 Vietnam.

出版信息

RSC Adv. 2018 Apr 3;8(22):12420-12427. doi: 10.1039/c8ra01363b. eCollection 2018 Mar 26.

DOI:10.1039/c8ra01363b
PMID:35539414
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9079757/
Abstract

Here, we synthesized copper(i) oxide and titanium dioxide nanotubes (TNTs) heterojunctions (HJs) by a photoreduction method using a low-power UV lamp without involving any additional steps, such as chemical reduction, surfactant, or protection agents. Transmission electron microscopy, X-ray diffraction, Raman scattering, X-ray photoelectron spectroscopy, diffuse reflectance spectra, and photoluminescence spectroscopy were carried out to verify the formation of a HJ between the CuO nanoparticles (CuO NPs) and TNTs. The efficiency and the rate of methylene blue photo-degradation over the CuO/TNTs HJ were found to be nearly double and triple compared to the isolated TNTs. The enhanced efficiency is attributed to the narrow band gap and defect states caused by the oxygen vacancies in the vicinity of HJs. Moreover, the type II band alignment of CuO NPs and TNTs naturally separates the photo-generated carriers and constrains the recombination process owing to the internal electric field across the CuO/TNTs interface.

摘要

在此，我们通过使用低功率紫外灯的光还原方法合成了氧化铜（I）与二氧化钛纳米管（TNTs）异质结（HJs），无需涉及任何额外步骤，如化学还原、表面活性剂或保护剂。进行了透射电子显微镜、X射线衍射、拉曼散射、X射线光电子能谱、漫反射光谱和光致发光光谱分析，以验证氧化铜纳米颗粒（CuO NPs）与TNTs之间形成了异质结。结果发现，与孤立的TNTs相比，CuO/TNTs异质结上亚甲基蓝光降解的效率和速率几乎提高了一倍和两倍。效率的提高归因于异质结附近氧空位导致的窄带隙和缺陷态。此外，CuO NPs和TNTs的II型能带排列自然地分离了光生载流子，并由于CuO/TNTs界面上的内电场抑制了复合过程。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6ee2/9079757/53a204663f53/c8ra01363b-f7.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6ee2/9079757/53a204663f53/c8ra01363b-f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6ee2/9079757/8aee12215ea1/c8ra01363b-f1.jpg
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