State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene (NPU), Xi'an, 710072, PR China.
Xi'an Modern Chemistry Research Institute, Xi'an, 710065, PR China.
Anal Chim Acta. 2023 Apr 22;1251:341013. doi: 10.1016/j.aca.2023.341013. Epub 2023 Feb 27.
Aerogels derived from the colloidal nanoparticles featured with hierarchical interconnected pore-rich networks guarantee their great potentials in various applications. Herein, the controllable assembly of three-dimensional aerogels based on Au nanoparticles (Au NPs) and reduced graphene oxide (rGO) nanosheets as building blocks via a bottom-up approach have been systematically clarified. The difference of building blocks and their assembly sequence were crucially to the final aerogel morphologies and electrochemical properties. Specifically, the highly porous graphene-gold dual aerogels (rGO-Au DAGs) with interconnected rGO nanosheets and Au nanowires showed high conductivity, large surface area and good biocompatibility. Thus, it was employed as an excellent matrix to immobilize enzyme for high-efficient bioelectrocatalysis. Taking bilirubin oxidase as an example, a more positive on-set potential (0.60 V) and a larger catalytic current density (0.77 mA cm@0.40 V) than those of other rGO-Au assemblies were achieved for direct bioelectrocatalytic O reduction. This study will provide an efficient strategy for unique dual-structural aerogels design and shed light to develop new functional materials for bioelectrocatalytic applications such as biosensors and biofuel cells.
由具有分级互连通孔丰富网络的胶体纳米粒子衍生的气凝胶保证了它们在各种应用中的巨大潜力。在此，通过自下而上的方法，系统地阐明了基于金纳米粒子（Au NPs）和还原氧化石墨烯（rGO）纳米片作为构建块的三维气凝胶的可控组装。构建块的差异及其组装顺序对最终气凝胶形态和电化学性能至关重要。具体而言，具有互连通 rGO 纳米片和 Au 纳米线的高多孔石墨烯-金双气凝胶（rGO-Au DAG）具有高导电性、大比表面积和良好的生物相容性。因此，它被用作固定酶的优异基质，以实现高效的生物电化学催化。以胆红素氧化酶为例，与其他 rGO-Au 组装体相比，直接生物电化学 O 还原的起始电位（0.60 V）更正，催化电流密度（0.77 mA cm@0.40 V）更大。这项研究将为独特的双结构气凝胶设计提供一种有效的策略，并为生物电化学应用（如生物传感器和生物燃料电池）开发新型功能材料提供启示。
