化学原位还原法制备石墨烯-铜纳米颗粒复合物

In situ chemical reduction method for graphene-copper nanoparticle composite

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。

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.