Oriented preparation and thermal conductivity of reduced graphene oxide-graphite phase carbon nitride composites by electrostatic self-assembly
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摘要: 采用NaOH溶液将块状多层石墨相氮化碳(B-g-C3N4)剥离成带负电的纳米片层石墨相氮化碳(g-C3N4),并与带正电(经聚二烯丙基二甲基氯化铵(PDDA)改性)的还原氧化石墨烯(RGO)通过静电自组装的方式,制得“面-面”定向结合的RGO-g-C3N4二维异质层状复合材料。Zeta电位研究表明,静电组装过程主要受电荷中和作用的主导,通过改变RGO和g-C3N4表面的Zeta电位可控制静电自组装材料的组成及形貌。拉曼光谱和XPS测试结果说明,RGO-g-C3N4复合材料具有g-C3N4和RGO共同的结构特征; SEM和TEM结果进一步说明,RGO和g-C3N4纳米片在垂直方向上“面对面”定向叠加结合,复合后仍为片层状结构,层厚度明显增加。RGO-g-C3N4复合材料的导热系数随RGO含量的增加而增大,RGO含量为24.4wt%时,其导热系数达到4.2 W/(mK),是相同质量分数简单物理混合RGO+g-C3N4复合材料导热系数(3.0 W/(mK))的1.4倍,由于RGO-g-C3N4复合材料形成有效导热链,使RGO-g-C3N4复合材料的导热系数高于简单物理混合RGO+g-C3N4复合材料的导热系数。
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关键词:
- 定向静电自组装 /
- 二维异质层 /
- RGO-g-C3N4 /
- 复合材料 /
- Zeta电位
Abstract: The 2D face-to-face oriented hetero-layered composites reduced graphene oxide-graphite phase carbon nitride(RGO-g-C3N4) was fabricated by electrostatic self-assembly of RGO and g-C3N4 nanosheet. The g-C3N4 nanosheet and RGO was obtained by stripping the bulk multi-layer graphite carbon nitride (B-g-C3N4) and modified graphene oxide (GO) with polydiallyldimethylammonium chloride (PDDA), respectively. Zeta potential study shows that the process of self-assembly is influenced obviously by the Zeta potentials of RGO and g-C3N4 and the process is mainly controlled by charge neutralization. The characterization results of Raman spectroscopy and XPS indicate that the 2D layered RGO-g-C3N4 composites behave the common structural features of both g-C3N4 and RGO. The results of SEM and TEM also demonstrate that the layers of RGO and g-C3N4 are combined face-to-face in vertical direction and the RGO-g-C3N4 composites remain layer structure but with thickness increase obviously. The thermal conductivity of RGO-g-C3N4 composites is higher than that of simple mixture RGO+g-C3N4 with the same mass fraction of components. And the thermal conductivity of the RGO-g-C3N4 composites increases when RGO increasing. When the RGO content is 24.4 wt%, the thermal conductivity of the RGO-g-C3N4 composites is 4.2 W/(mK), which is 1.4 times of the thermal conductivity of RGO+g-C3N4 composites mixed simply with the same mass fraction of components.-
Key words:
- oriented electrostatic self-assembly /
- 2D hetero layer /
- RGO-g-C3N4 /
- composite /
- Zeta potential
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