高疏水及超黏着性石墨烯薄膜的制备及表征

Synthesis and Characterization of Strong Hydrophobic and Adhesive Graphene Films

石墨烯因其特殊的二维结构和优异的力热光电性能而备受关注,因此研究石墨烯薄膜的表面性能具有重要的意义。以天然鳞片石墨为前驱体,采用化学氧化还原工艺制备石墨烯纳米片,利用原子力显微镜、拉曼光谱和红外吸收光谱等测试手段对样品进行表征。采用真空抽滤和喷涂两种方法制备石墨烯薄膜,并用光学接触角测量仪对其表面性能进行测试。结果表明:石墨烯纳米片的厚度约为0.8nm,并且表面有C=O、C-O、O-H等基团和缺陷。真空抽滤制备的石墨烯薄膜具有微纳结构,表现为高疏水性;喷涂法制备的石墨烯薄膜结构较为平整,其疏水性受基底影响。两种方法制备的石墨烯薄膜皆具有高黏着性。石墨烯薄膜所具有的优异性能为其在微纳功能部件、微流输运等高新技术领域的应用奠定了基础。

Graphene has been paid much attention for its special two-dimensional structure and excellent e- lectronic transport performance, mechanical strength and electron mobility, thus the research about the sur- face properties of graphene films is significant. Graphene was synthesized via chemical exfoliation of natural flake graphite following redox process. The characteristics of graphene were investigated by atomic force mi- croscopy （AFM）, raman microscopy and fourier transport infrared microscopy （FTIR）. Subsequently, gra- phene films were fabricated via two methods that were suction filtration and spray coating, and measured via optical contact angle meter. The results show that the graphene nanosheets are 0.8 nm height, and C= O, C-O, O-H groups and defects on the surface of graphene. Graphene films prepared via suction filtration show high hydrophohicity, while that via spray coating prove hydrophobicity concerning on the substrate, and both the graphene films show high adhesive performance. The excellent performances of graphene films are impor- tant to their application in devices and microfluidic transport, and so on.