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Ice-templated hybrid graphene oxide-graphene nanoplatelet lamellar architectures: tuning mechanical and electrical properties

机译：冰晶化杂交石墨烯氧化物 - 石墨烯纳米克罗特板架构：调整机械和电气性能

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The traditional freeze-casting route for processing graphene-based aerogels is generally restricted to aqueously dispersed flakes of graphene oxide (GO) and post-processing reduction treatments, which brings restrictions to the aerogels electrical properties. In this work, we report a versatile aqueous processing route that uses the ability of GO todisperse graphene nanoplatelets (GNP) to produce rGO-GNP lamellar aerogels via unidirectional freeze-casting. In order to optimise the properties of the aerogel, GO-GNP dispersions were partially reduced by L-ascorbic acid prior to freeze-casting to tune the carbon and oxygen (C/O) ratio. The aerogels were then heat treated after casting to fully reduce the GO. The chemical reduction time was found to control the microstructure of the resulting aeorgels and thus to tune their electrical and mechanical properties. An rGO-GNP lamellar aerogel with density of 20.8 0.8 mg cm(-3) reducing using a reduction of 60 min achieved an electrical conductivity of 42.3 S m(-1). On the other hand, an optimal reduction time of 35 min led to an aerogel with compressive modulus of 0.51 0.06 MPa at a density of 23.2 0.7 mg cm(-3), revealing a compromise between the tuning of electrical and mechanical properties. We show the present processing route can also be easily applied to produce lamellar aerogels on other graphene-based materials such as electrochemically exfoliated graphene.
机译：传统的冷冻铸造法加工石墨烯基气凝胶通常仅限于水分散的氧化石墨烯薄片（GO）和后处理还原处理，这对气凝胶的电性能带来了限制。在这项工作中，我们报道了一种通用的水处理方法，该方法利用石墨烯纳米片（GNP）的分散能力，通过单向冷冻浇铸制备rGO-GNP层状气凝胶。为了优化气凝胶的性能，GO-GNP分散体在冷冻浇铸前被L-抗坏血酸部分还原，以调整碳氧比（C/O）。然后在铸造后对气凝胶进行热处理，以完全减少GO。研究发现，化学还原时间可以控制生成的凝胶的微观结构，从而调整其电气和机械性能。密度为20.8 0.8 mg cm（-3）的rGO GNP层状气凝胶通过60分钟的还原获得42.3 S m（-1）的电导率。另一方面，最佳还原时间为35分钟，在密度为23.2 0.7 mg cm（-3）的条件下，得到压缩模量为0.51 0.06 MPa的气凝胶，揭示了电性能和机械性能调节之间的折衷。我们表明，目前的工艺路线也可以很容易地应用于在其他石墨烯基材料（如电化学剥离石墨烯）上制备层状气凝胶。

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