【作者】 张燕； 李英； 李德春；

【Author】 Yan Zhang;Ying Li;Dechun Li;Key Laboratory of Colloid and Interface Chemistry of State Education Ministry,Shandong University;School of Information Science and Engineering,Shandong University;

【机构】 山东大学； 山东大学化学与化工学院胶体与界面教育部重点实验室； 山东大学信息科学与工程学院；

【摘要】 单壁碳纳米管独特的光电及机械性能使其在高性能的纳米电子器件及柔性传感器领域具有潜在的应用前景。由于管间范德华力所导致的聚集是限制单壁碳纳米管实际应用的主要因素。目前,单壁碳纳米管的分散主要是利用表面活性剂,聚合物或者生物分子作为分散剂在水溶液或者有机溶剂中通过超声辅助实现。吸附在碳纳米管表面的分散剂可对碳纳米管的光电性能带来影响,而且很难去除。本文中,我们利用四氢呋喃-水的混合溶液为溶剂,通过超声产生纳米气泡,在无表面活性剂和聚合物等分散剂的条件下,实现了单壁碳纳米管的分散。四氢呋喃-水的混合溶液的共沸点较低,在超声作用下,单壁碳纳米管的疏水表面有利于纳米气泡成核,而且溶液中高能量的输入有利于大量气液界面的形成,使单壁碳纳米管的表面和溶液中产生大量的纳米气泡而将单壁碳纳米管进行分散。纳米气泡较小的密度使其在体相中快速运动而保持单壁碳纳米管分散液的稳定性。紫外-可见-近红外吸收光谱和荧光光谱用于表征单壁碳纳米管的单分散性。由于体系中不含分散剂,而碳纳米管表面的纳米气泡不会影响分散的单壁碳纳米管的电子结构,由此保证了碳纳米管优异的光电性能。更多还原

【Abstract】 The unique optoelectrical and mechanical properties of single-walled carbon nanotubes(SWNTs) made them promising materials for high-performance nanoelectronic devices and flexible sensors.However,the aggregation of SWNTs due to strong intertube van der Waals interaction greatly limited their practical applications.So far,SWNTs was dispersed mainly by the covalent or noncovalent functionalization of surfactants,polymers orbiomolecules in aqueous or organic solvents under sonication.The dispersants on the surface of SWNTs might affecte theoptoelectric performance of SWNTs,and the subsequent removal is challenging.Here,we proposed a novel method to disperse SWNTs by nanobubbles generated in tetrahydrofuran(THF)-water mixture under sonication,without the surfactants or polymers.The low azeotropic point of the THF-water mixture and the hydrophobic surface of SWNTs were in favor of the nanobubble nucleation,under high-power sonication;the importation of the high power in the SWNTs-THF-H2 O induced the formation of gas-liquid interface.The nanobubbles generated in the surface of SWNTs and in bulk effectively dispersed the SWNTs and the rapid movement of the nanobubbles in bulk due to the low density made the dispersion of SWNTs stability.The electronic structure of SWNTs were not disturbed by nanobubbles,which ensured their excellent performance.更多还原