化学原位还原法制备石墨烯－铜纳米颗粒复合物

石墨烯－铜纳米颗粒复合物具有良好的电导率、电催化活性和化学可修饰性，在电化学和生物传感器等方面有广泛的应用前景。本文采用水合肼和KBH4原位化学还原氧化石墨烯和Cu2＋混合溶液制备石墨烯－铜纳米颗粒复合物。结果表明：石墨烯－铜纳米颗粒复合物只有在碱性或中性溶液中才能制备成功，水合肼比KBH4的还原效果好。水合肼还原后的石墨烯呈半透明薄纱状，铜纳米颗粒成功地、均匀地沉积在石墨烯纳米片上，独立存在不团聚，大小均匀，边长≈1μm，呈三角形或者六边形纳米片，正六边形纳米片的｛111｝面、不规则六边形和三角形纳米片的｛110｝面平行于石墨烯的二维平面。

In situ chemical reduction method for graphene-copper nanoparticle composite

Graphene?copper nanoparticle composite has broad application prospects in electrochemical biosensors owing to its good conductivity, electro?catalytic activity and chemical modification. In this paper, graphene?copper nanoparticle composite was prepared by in situ chemical reduction of a mixture containing graphene oxide and copper ( II ) ions using hydrazine hydrate or potassium borohydride as a reductant. It is revealed that graphene?copper nanoparticle composite can only successfully prepared in alkaline or neutral solution. Graphene reduced by hydrazine hydrate is translucent chiffon?like. Copper nanoparticles with a uniform size ( side length ≈1 μm) are non?agglomerated triangular or hexagonal, and uniformly deposited on graphene nanosheets. {111} surface of hexagonal copper nano?sheets and {110} surface of triangular copper nano?sheets parallel to the graphene plane.