Centre for Nanochemistry, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry & Molecular Engineering, Peking University, Beijing, People's Republic of China.
J Am Chem Soc. 2011 Mar 2;133(8):2706-13. doi: 10.1021/ja109934b. Epub 2011 Feb 3.
TiO(2)-based photocatalysis has been widely used to decompose various organic pollutants for the purpose of environmental protection. Such a "green" photochemical process can ultimately degrade organic compounds into CO(2) and H(2)O under ambient conditions. We demonstrate here its extended application on the engineering of single- or few-layer graphene. Using a patterned TiO(2) photomask, we have achieved various photochemical tailorings of graphene, including ribbon cutting, arbitrary patterning on any substrate, layer-by-layer thinning, and localized graphene to graphene oxide conversion. UV-visible spectroscopic studies indicate that the photogenerated, highly reactive ·OH radicals work as sharp chemical scissors. Being a solution-free, cost-effective, scalable, and easy handling technique, the presented photocatalytic patterning and modification approach allows for the versatile design and fabrication of graphene-based devices and circuits, compatible with current microelectronic technology, as demonstrated by this fabricated all-carbon field effect transistor (FET) array.
基于 TiO(2) 的光催化已被广泛用于分解各种有机污染物，以达到环境保护的目的。这种“绿色”光化学过程可以在环境条件下将有机化合物最终降解为 CO(2) 和 H(2)O。我们在这里展示了它在单原子层或少数层石墨烯工程方面的扩展应用。使用图案化的 TiO(2) 光掩模，我们已经实现了对石墨烯的各种光化学裁剪，包括带状切割、在任何基底上进行任意图案化、逐层变薄以及局部石墨烯到氧化石墨烯的转化。紫外可见光谱研究表明，光生的高反应性·OH 自由基充当锐利的化学剪刀。作为一种无溶液、经济高效、可扩展和易于处理的技术，所提出的光催化图案化和修饰方法允许基于石墨烯的器件和电路的多功能设计和制造，与当前微电子技术兼容，如通过这个制造的全碳场效应晶体管 (FET) 阵列所示。
