超声剥离制备石墨烯纳米片及其结构表征

Preparation and Characterization of Graphene Nanoplatelets by Ultrasonic Stripping

以鳞片石墨为原料,采用插层氧化法制得可膨胀氧化石墨,然后经高温热解获得膨胀石墨,再通过超声剥离得到石墨烯纳米片,采用FTIR、XRD、SEM、TEM和Raman对所得石墨烯纳米片的微观结构进行表征。结果表明,可膨胀氧化石墨在800℃高温热解30 s得到膨胀体积最大的膨胀石墨,由80目和100目鳞片石墨制得的膨胀石墨的最大体积分别为215 mL/g和85 mL/g,且在50℃条件下超声剥离5 h分别得到30~50层和6~20层的石墨烯纳米片。

Flake graphite was used as raw material to make expandable oxidized graphite by intercalation oxidation, then the ex- panded graphite was obtained when expandable oxidized graphite was pyrolyzed at high temperature, and the graphene nano- platelet was obtained by ultrasonic stripping of expanded graphite. FrIR, XRD, SEM, TEM and Raman were adopted to char- acterize the graphene nanoplatelet. The results indicated that expanded graphite with the largest expansion volume could be a- chieved with the expandable oxidized graphite being pyrolyzed at 800 ℃ for 30 s. The maximum volums of the expanded graph- ites from the 80 and 100 mesh flake graphites were 215 mL/g and 85 mL/g, and when they were ultrasonic stripped at 50 ℃ for 5 hrs, graphene nanoplatelets of 30 ~ 50 layers and 6 - 20 layers could be gained, respectively.