Department of Mechanical and Materials Engineering, The University of Western Ontario, London, ON, N6A 5B8, Canada.
Nanotechnology. 2011 Apr 22;22(16):165602. doi: 10.1088/0957-4484/22/16/165602. Epub 2011 Mar 11.
Atomic layer deposition (ALD) was used to synthesize graphene-based metal oxide nanocomposites. This strategy was fulfilled on the preparation of TiO(2)-graphene nanosheet (TiO(2)-GNS) nanocomposites using titanium isopropoxide and water as precursors. The synthesized nanocomposites demonstrated that ALD exhibited many benefits in a controllable means. It was found that the as-deposited TiO(2) was tunable not only in its morphologies but also in its structural phases. As for the former, TiO(2) was transferable from nanoparticles to nanofilms with increased cycles. With regard to the latter, TiO(2) was changeable from amorphous to crystalline phase, and even a mixture of the two with increased growth temperatures (up to 250 °C). The underlying growth mechanisms were discussed and the resultant TiO(2)-GNS nanocomposites have great potentials for many applications, such as photocatalysis, lithium-ion batteries, fuel cells, and sensors.
原子层沉积（ALD）被用于合成基于石墨烯的金属氧化物纳米复合材料。该策略在使用异丙醇钛和水作为前体制备 TiO(2)-石墨烯纳米片（TiO(2)-GNS）纳米复合材料方面得以实现。合成的纳米复合材料表明，ALD 在可控手段方面具有许多优势。研究发现，所沉积的 TiO(2)不仅在形貌上可调，而且在结构相上也可调。就前者而言，随着循环次数的增加，TiO(2)可以从纳米颗粒转变为纳米薄膜。至于后者，TiO(2)可以从非晶相向晶相转变，甚至在升高的生长温度下（高达 250°C）两者混合存在。讨论了潜在的生长机制，所得的 TiO(2)-GNS 纳米复合材料在光催化、锂离子电池、燃料电池和传感器等许多应用中具有很大的潜力。
