化学修饰对多壁碳纳米管电学性质的影响

The Impact of Chemical Modification on the Electronic Properties of Multiwall Carbon Nanotubes

采用混酸和二甲亚砜对碳纳米管进行官能化修饰,实验发现经化学修饰后对多壁碳纳米管膜的电学性质有明显影响。经化学修饰后的碳纳米管膜电阻由结电阻和管电阻组成,未经化学修饰的碳纳米管膜电阻主要由碳纳米管管电阻决定。碳纳米管经化学修饰后,碳纳米管结增多,碳纳米管管电阻降低而碳纳米管结电阻增大。未经修饰的碳纳米管膜电阻随着温度的升高而略有增大,呈金属性;经混酸修饰的碳纳米管膜电阻随着温度的升高而减小,呈半导体性。

The functional modification of multiwall carbon and thionyl chloride treatment. Experimental result shows that the nanotubes （MWCNTs） is obtained by mixed acid electric properties of MWCNTs film strongly dependent on the pretreatment. The resistance of films consists of the resistance of MWCNTs junctions and tube resistance. The resistance of untreated MWCNTs films mostly consists of tube resistance. Chemical modification increases the resistance of MWCNTs films, and the resistance of treated MWCNTs films is decided by junctions resistance. The resistance of untreated ones is mostly decided by MWCNTs tube resistance, and is with metallicity. The resistance of treated ones is mostly decided by MWCNTs junction resistance and with the property of semiconductor, while temperature coefficient is negative.