Graphene-Like Carbon Nitride Nanosheets for Improved Photocatalytic Activities
Graphene-Like Carbon Nitride Nanosheets for Improved Photocatalytic Activities
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类石墨烯氮化碳纳米片可改善光催化活性
DOI：
10.1002/adfm.201200922
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发表时间：
2012-11-21
影响因子：
19
通讯作者：
Cheng, Hui-Ming
中科院分区：
文献类型：
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作者：
Niu, Ping;Zhang, Lili;Cheng, Hui-Ming
具有层状结构的石墨（g）-C3 N4由于层间弱的货车范德华力而具有形成具有不寻常的物理化学性质的石墨烯样纳米片的潜力。本文中示出的g-C3 N4纳米片的厚度约为2 nm，可以很容易地获得通过一个简单的自上而下的策略，即，在空气中的大块g-C3 N4的热氧化蚀刻。与块状g-C3 N4相比，高度各向异性的2D纳米片具有306 m2 g-1的高比表面积、更大的带隙（0.2 eV）、改善的电子沿面内方向的传输能力沿着，以及由于量子限制效应而增加的光激发电荷载流子的寿命。因此，g-C3 N4纳米片的光催化活性在OH自由基产生和光催化析氢方面得到了显着提高。
Graphitic (g)-C3N4 with a layered structure has the potential of forming graphene-like nanosheets with unusual physicochemical properties due to weak van der Waals forces between layers. Herein is shown that g-C3N4 nanosheets with a thickness of around 2 nm can be easily obtained by a simple top-down strategy, namely, thermal oxidation etching of bulk g-C3N4 in air. Compared to the bulk g-C3N4, the highly anisotropic 2D-nanosheets possess a high specific surface area of 306 m2 g-1, a larger bandgap (by 0.2 eV), improved electron transport ability along the in-plane direction, and increased lifetime of photoexcited charge carriers because of the quantum confinement effect. As a consequence, the photocatalytic activities of g-C3N4 nanosheets have been remarkably improved in terms of OH radical generation and photocatalytic hydrogen evolution.