Fabrication and electrical properties of nano-silver/graphene composite powders prepared in-situ by chemical reduction
ZHI Ying1, GAN Weiping1, ZHOU Jian2, WANG Xiaoqing1
1. School of Materials Science and Engineering, Central South University, Changsha 410083, China; 2. Key Laboratory of Jiangxi University for Applied Chemistry and Chemical Biology, Yichun University, Yichun 336000, China
Abstract：Nano-silver/graphene composite powders were prepared by chemical reduction method using hydrazine hydrate as reducing agent, PVP as dispersant, graphene oxide and silver nitrate as precursor at the reaction temperature of 60 ℃ and the pH of 6. The effects of silver nitrate concentration in solution on the morphology and structure of nano-silver/graphene composite powders were investigated by SEM, XRD, IR and RAMAN. Low temperature curing conductive silver paste was prepared by using graphene/nano-silver composite powder instead of some micron silver powder, and its conductive properties were studied. The results indicate that Ag nanoparticles uniformly distribute in the graphene sheets. Pherical silver particles with better dispersibility and uniform particle size can be obtained by using 0.75 g/L of silver nitrate, 0.25 g/L of graphene oxide. The size of Ag nanoparticles on the graphene sheets centralizes at 100 nm. When using graphene/nano-silver composite powder instead of 4% micron silver powder to prepare conductive paste, the volume resistivity of conductive paste is 1.8×10-5 Ω·cm. Compared with the conductive paste without graphene/nano-silver composite powder, the resistivity decreases by 61.7%.
支英, 甘卫平, 周健, 王晓庆. 化学还原法原位制备石墨烯/纳米银复合粉体及其导电性能[J]. 粉末冶金材料科学与工程, 2018, 23(4): 433-438.
ZHI Ying, GAN Weiping, ZHOU Jian, WANG Xiaoqing. Fabrication and electrical properties of nano-silver/graphene composite powders prepared in-situ by chemical reduction. Materials Science and Engineering of Powder Metallurgy, 2018, 23(4): 433-438.
[1] WU Songping.Preparation of micron size flake silver powders for conductive thick films[J]. Journal of Materials Science: Materials in Electronics, 2006, 18(4): 447-52. [2] 张文毓. 纳米银粉研究与应用[J]. 中国粉体工业, 2016(4): 7-11. ZHANG Wenyu.Research and application of nano silver powder[J]. China Powder Industry, 2016(4): 7-11. [3] 赵德强, 马立斌, 杨君, 等. 银粉及电子浆料产品的现状及趋势[J]. 电子元件与材料, 2005, 24(6): 54-56. ZHAO Deqiang, MA Libin, YANG Jun, et al.Status and trend of silver powder and electronic slurry products[J]. Electronic Components and Materials, 2005, 24(6): 54-56. [4] FENG Yi, YUAN Hailong, ZHANG Min.Fabrication and properties of silver-matrix composites reinforced by carbon nanotubes[J]. Materials Characterization, 2005, 55(3): 211-218. [5] GEIM A K, NOVOSELOV K S.The rise of graphene[J]. Nature Materials, 2007, 6(3): 183-191. [6] JIANG Lili, LU Xiong.Graphene applications in solar cells[J]. Journal of Inorganic Materials, 2013, 27(11): 1129-1137. [7] XIE Yunfei, LI Yan, LI Niu, et al.A novel surface-enhanced Raman scattering sensor to detect prohibited colorants in food by graphene/silver nanocomposite[J]. Talanta, 2012, 100(20): 32-37. [8] YOO E, KIM J, HOSONO E, et al.Large reversible Li storage of graphene nanosheet families for use in rechargeable lithium ion batteries[J]. Nano Lett, 2008, 8(8): 2277-2282. [9] WANG Guoxiu, WANG Bei, WANG Xianlong, et al.Sn/ graphene nanocomposite with 3D architecture for enhanced reversible lithium storage in lithium ion batteries[J]. Journal of Materials Chemistry, 2009, 19(44): 8378-8384. [10] 尹奎波, 朱逸宇, 韩宇龙, 等. Ag-石墨烯纳米复合材料的室温制备及其结构分析[J]. 电子显微学报. 2011, 30(3): 187-90. YIN Kuibo, ZHU Yiyu, HAN Yulong, et al.Room-temperature synthesis and structure characterization of silver-graphene nanocomposites[J]. Journal of Chinese Electron Microscopy Society, 2011, 30(3): 187-90. [11] HE Hongkun, GAO Chao, et al.Graphene nanosheets decorated with Pd, Pt, Au and Ag nanoparticles: Synthesis, characterization and catalysis applications[J]. Chinese Science: Chemistry, 2011, 54(2): 397-404. [12] STANKOVICH S, DIKIN D A, PINER R D, et al.Synthesis of graphene-based nanosheets via chemical reduction of exfoliated graphite oxide[J]. Carbon, 2007, 45(7): 1558-1565. [13] 周亚洲, 杨娟, 孙磊, 等. 石墨烯/银复合薄膜的制备及表征[J]. 无机化学学报, 2012, 28(1): 137-142. ZHOU Yazhou, YANG Juan, SUN Lei, et al.Synthesis and characterization of graphene/Ag composite films[J]. Chinese Journal of Inorganic Chemistry, 2012, 28(1): 137-142. [14] JR W S H, OFFEMAN R E. Preparation of graphitic oxide[J]. Journal of the American Chemical Society, 1958, 80(6): 1339-1339. [15] LIU S, TIAN J, WANG L, et al.Stable aqueous dispersion of graphene nanosheets: Noncovalent functionalization by a polymeric reducing agent and their subsequent decoration with Ag nanoparticles for enzymeless hydrogen peroxide detection[J]. Macromolecules, 2010, 43(23): 10078-10083. [16] PARK S, AN J, JUNG I, et al.Colloidal suspensions of highly reduced graphene oxide in a wide variety of organic solvents[J]. Nano Letters, 2009, 9(4): 1593-1597. [17] 黄桥, 孙红娟, 杨勇辉. 氧化石墨的谱学表征及分析[J]. 无机化学学报, 2011, 27(9): 1721-1726. HUANG Qiao, SUN Xiaojuan, YANG Yonghui.Spectroscopy characterization and analysis of graphite oxide[J]. Chinese Journal of Inorganic Chemistry, 2011, 27(9): 1721-1726. [18] SAITO R, HOFMANN M, DRESSELHAUS G.et al.Raman spectroscopy of graphene and carbon nanotubes[J]. Advances in Physics, 2011, 60(3): 413-550. [19] CAO A, LIU Z, CHU S, et al.A facile one-step method to produce graphene-CdS quantum dot nanocomposites as promising optoelectronic materials[J]. Advanced Materials, 2010, 22(1): 103-106.
2018, Vol. 23 
