Karthick R, Hou Xianhua, Ru Qiang, Chandrasekaran S Selva, Ramesh M, Chen Fuming
Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, Guangdong Engineering Technology Research Center of Efficient Green Energy, Environment Protection Materials, School of Physics and Telecommunication Engineering, South China Normal University Guangzhou 510006 P. R. China
Functional Materials Division, CSIR-Central Electrochemical Research Institute Karaikudi 600003 TamilNadu India
RSC Adv. 2019 Oct 21;9(58):33781-33788. doi: 10.1039/c9ra05529k. eCollection 2019 Oct 18.
Free-standing graphene (FSG) paper plays a vital role in a wide variety of applications as an electrode material. Specifically, the electrical properties of FSG are the most important factor affecting its use as an electrode material. Herein, the vacuum filtration technique is utilized to fabricate GO paper, which is then reductively treated with HI. Initially, the electrical conductivity is measured for GO papers with different thicknesses by varying the concentration of GO precursor as well as the reduction time. The FSG paper with a thickness of 3 microns exhibits the lowest sheet resistance and further characterization is carried out to reveal the origin of this enhancement of electrical properties. The low resistance is attributed to its crystalline nature, stacking height ( ), in-plane crystallite size ( ) and defect density ( ). Meanwhile, iodide ions intercalated into the graphene layers act as hole-carriers, and their intercalation is favoured over adsorption at the surface.
独立石墨烯（FSG）纸作为电极材料在各种应用中起着至关重要的作用。具体而言，FSG的电学性质是影响其作为电极材料使用的最重要因素。在此，利用真空过滤技术制备氧化石墨烯纸，然后用氢碘酸对其进行还原处理。首先，通过改变氧化石墨烯前驱体的浓度以及还原时间，测量不同厚度的氧化石墨烯纸的电导率。厚度为3微米的FSG纸表现出最低的面电阻，并进行了进一步表征以揭示这种电学性质增强的原因。低电阻归因于其晶体性质、堆叠高度（ ）、面内微晶尺寸（ ）和缺陷密度（ ）。同时，插入石墨烯层的碘离子充当空穴载流子，并且它们的插入比在表面的吸附更受青睐。
