Covalent graphite modification by low-temperature photocatalytic oxidation using a titanium dioxide thin film prepared by atomic layer deposition

Ostyn Niels R.; Sree Sreeprasanth Pulinthanathu; Li JinFeng Ji-YuRoeffaers Maarten B. J.De Feyter StevenDendooven JolienDetavernier ChristopheMartens Johan A.

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Covalent graphite modification by low-temperature photocatalytic oxidation using a titanium dioxide thin film prepared by atomic layer deposition

机译：通过低温共价石墨改性使用二氧化钛光催化氧化薄膜由原子层沉积

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Oxidative modification of graphene-based materials is an attractive route to functional materials. The use of strong oxidants to achieve surface modification of the carbon often leads to poor uniformity and limited reproducibility. Photocatalytic oxidation is a milder method. In this work, graphite is surface oxidized using an anatase thin photocatalytic film with a thickness of 22.5 nm facing the graphite surface to be oxidized. The high UV light transparency (95%) of the supported titania film simplified the experimental setup. The titania thin film was prepared using atomic layer deposition (ALD). Excellent oxidation uniformity and reaction reproducibility are achieved. By avoiding the use of chemical reagents there is no chemical contamination. Graphite photo-oxidation with the titania film prepared with ALD is much faster than with a powdery photocatalyst. The photocatalytic process runs efficiently with air containing water vapor. High resolution scanning electron microscopy (HRSEM), Raman and X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM) confirmed the formation of hydroxyl, epoxy and carbonyl functional groups. ALD is a suitable method for thin film preparation rendering this photocatalytic process suitable for scale-up and automation. Photocatalytically oxidized graphite (POG) electrodes are a potential application.

机译：氧化石墨烯材料的改性是一个有吸引力的功能材料。强氧化剂的使用来实现表面改性的碳常常会导致贫穷一致性和再现性有限。光催化氧化是一种温和的方法。这项工作,使用一个石墨表面氧化锐钛矿光催化薄膜厚度面临的22.5纳米石墨表面氧化了。支持的二氧化钛膜简化了实验设置。准备使用原子层沉积(ALD)。优秀的一致性和氧化反应再现性。化学试剂没有化学污染。二氧化钛薄膜制备与ALD要快得多比粉末光催化剂。光催化过程的运行效率与空气含有水蒸气。电子显微镜(HRSEM)、拉曼光谱和x射线光电子能谱(XPS)、原子力显微镜(AFM)证实的形成羟基、环氧和羰基官能团。“肾上腺脑白质退化症”是一种适合薄膜的方法准备渲染这光催化过程适合扩大和自动化。保留氧化石墨(POG)电极是一个潜在的应用程序。

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来源
《Catalysis science & technology》 |2021年第20期|6724-6731|共8页
作者
Ostyn Niels R.; Sree Sreeprasanth Pulinthanathu; Li JinFeng Ji-YuRoeffaers Maarten B. J.De Feyter StevenDendooven JolienDetavernier ChristopheMartens Johan A.;
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作者单位

Katholieke Univ Leuven, Ctr Surface Chem & Catalysis Characterizat & Appl, Celestijnenlaan 200F,Box 2461, B-3001 Heverlee, Belgium;

Katholieke Univ Leuven, Ctr Membrane Separat Adsorpt Catalysis & Spect Su, Celestijnenlaan 200F,Box 2461, B-3001 Heverlee, Belgium;

Katholieke Univ Leuven, Div Mol Imaging & Photon, Dept Chem, Celestijnenlaan 200F, B-3001 Heverlee, BelgiumUniv Ghent, Dept Solid State Sci, Conformal Coating Nanostruct CoCooN, Krijgslaan 281-S1, B-9000 Ghent, Belgium;

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正文语种英语
中图分类汉语教学;
关键词
mealiness; graphene; atomic layer depositionOxidationtitanium dioxideGraphitethin filmsCHEMICAL REAGENT;

机译：粉状;石墨烯原子层depositionOxidationtitanium dioxideGraphitethinfilmsCHEMICAL试剂;

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Covalent graphite modification by low-temperature photocatalytic oxidation using a titanium dioxide thin film prepared by atomic layer deposition

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