大尺寸银纳米片的可控、高效制备及在导电胶中的应用  

Controllable and efficient preparation of large-sized silver nanosheets and their application in conductive adhesives

作　　者：邱择栋 季鑫 魏玉杭 杨向民[2] 张震[2] 方斌[2] QIU ZeDong;JI Xin;WEI YuHang;YANG XiangMin;ZHANG Zhen;FANG Bin(School of Materials Science and Engineering,East China University of Science and Technology,Shanghai 200237,China;School of Physics,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]华东理工大学材料科学与工程学院,上海200237 [2]华东理工大学物理学院,上海200237

出　　处：《北京化工大学学报（自然科学版）》2024年第2期57-65,共9页Journal of Beijing University of Chemical Technology(Natural Science Edition)

摘　　要：具有二维片状结构的银纳米片表现出优异的电学、光学和化学性质,广泛应用于电子、催化、生物等领域。化学还原法制备的银纳米片直径通常小于1μm,且产量低。为了解决上述问题,以鸟嘌呤为结构诱导剂,硝酸银为银源,通过化学还原法制备了大尺寸银纳米片,并得到优化的制备条件:在0℃下,滴加速度为1.0~1.3 mL/min,搅拌速度为300 r/min,B液中鸟嘌呤浓度为16.56 mmol/L、AgNO3浓度为0.50 mol/L,在最优条件下制得10~20μm的大尺寸银纳米片,单位体积反应液中银纳米片产量高达15 g/L。X射线衍射(XRD)和Raman光谱测试结果表明,银纳米片的生长机理为鸟嘌呤分子的羰基氧原子选择性吸附于银晶体的(111)晶面,形成包覆,还原生长的银原子沉积于(110)和(100)晶面,横向生长形成银纳米片。以最优条件下制备的大尺寸银纳米片作为填料,分别以二乙二醇单丁醚和乙醇为溶剂制得导电胶,其渗流阈值低至30%~40%(质量分数)。Silver nanosheets with a two-dimensional sheet structure exhibit excellent electrical,optical and chemical properties and are widely used in electronics,catalysis,biology and other fields.The diameter of silver nanosheets prepared by chemical reduction methods is usually less than 1μm,and the yield is low.In order to solve the above problems,large-sized silver nanosheets were prepared by a chemical reduction method with guanine as the structural inducer and silver nitrate as the silver source.The optimized preparation conditions were as follows:at 0℃,the dropping speed was 1.0-1.3 mL/min,the stirring speed was 300 r/min,and the concentrations of guanine and AgNO3 in solution B were 16.56 mmol/L and 0.50 mol/L,respectively.Under the optimal conditions,large-sized silver nanosheets with a diameter of 10-20μm were prepared,and the yield of silver nanosheets per unit volume of reaction solution was as high as 15 g/L.The results of X-ray diffraction(XRD)and Raman spectroscopy show that the growth mechanism of silver nanosheets is that the carbonyl oxygen atoms of guanine molecules are selectively adsorbed on the(111)crystal plane of silver crystals to form a coating,and the reduced silver atoms are deposited on the(110)and(100)crystal planes to form silver nanosheets by lateral growth.A conductive adhesive was prepared using the large-sized silver nanosheets prepared under the optimal conditions as fillers with diethylene glycol monobutyl ether and ethanol as solvents.The percolation threshold of the resulting materials was as low as 30%-40%(mass fraction).

关 键 词：银纳米片 鸟嘌呤 化学还原 导电胶 

分 类 号：TB333[一般工业技术—材料科学与工程]