A cost-effective method is essential for the applications of graphene platelets (GnPs) in polymer processing industry. Herein, a simple microwave expansion method was introduced to prepare graphene platelets (GnPs) of 11.7 ± 4.3 nm in thickness. By controlling the concentration of nitric acid, the surface of GnPs was tuned to be hydrophilic without causing severe damage to their structural integrity; the modified GnPs had thickness of 4.6 ± 2.1 nm, Raman I_D/I_G ratio of 0.09 and electrical conductivity of 570 S cm⁻¹. The platelets' high crystallinity before and after the surface modification was proved by TEM and SAED analysis. A percolation threshold of electrical conductivity was found at 0.89 vol% for poly (vinyl alcohol)/modified GnP nanocomposites. The platelets at 0.5 vol% improved tensile strength by 91.1% and Young's modulus by 66.7% due to relatively uniform dispersion and strong interfacial interactions with the matrix.

对于石墨烯血小板（GnP）在聚合物加工行业中的应用而言，一种具有成本效益的方法至关重要。在此，介绍了一种简单的微波膨胀方法来制备厚度为11.7±4.3 nm的石墨烯血小板（GnPs）。通过控制硝酸的浓度，可以将GnPs的表面调整为亲水性，而不会对其结构完整性造成严重损害。修饰的GnPs的厚度为4.6±2.1 nm，拉曼I _D / I _G比为0.09，电导率为570 S cm ^-1。通过TEM和SAED分析证明了表面改性前后血小板的高结晶度。对于聚乙烯醇/改性的GnP纳米复合材料，发现电导率的渗透阈值为0.89vol％。由于相对均匀的分散和与基质的强界面相互作用，0.5％（体积）的血小板使抗张强度提高了91.1％，杨氏模量提高了66.7％。