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Key Words:Nickel oxide;Coordination reactions - Crystalline materials - Graphene - Graphene oxide - Hybrid materials - Metals - Nanosheets - Organic polymers - Organometallics

Abstract:This work reports a facile approach for the synthesis of a novel hybrid material consisting of Cu–Ni cyano-bridged coordination polymer (CP) nanoflakes and graphene oxide (GO) nanosheets (CuCNNi/GO hybrid). The functional groups present on the GO nanosheets (e.g., carboxylic acid and hydroxyl groups) can promote interactions with Cu²⁺ ions. The electrostatic interactions with positively-charged Cu²⁺ ions causes the surface of the GO nanosheets to become positively charged and the addition of [Ni(CN)<inf>4</inf>]^2- initializes the formation and growth of CuCNNi nanoflakes on the GO surface. The thermal treatment of the CuCNNi/GO hybrid at 300–600 °C results in their conversion to porous Cu–Ni oxide/GO hybrids. As the GO nanosheets can prevent the rapid crystallization and fusion of metal oxides during the calcination process, an optimized Cu–Ni oxide/GO composite with a high surface area of 145 m² g¹ can be realized. More importantly, this specific surface area is higher than that of individual Cu–Ni oxide nanoflakes (11.1 m² g⁻¹). It is expected that this approach can be extended for the preparation of other CP-derived metal oxide/GO hybrids for a wide variety of functional applications.<br/> © 2019 Elsevier Inc.

Volume:290

Issue:

Translation or Not:no

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