湿化学法制备ATO/TiO2复合粉体电阻率及导电机理的研究

采用湿化学共沉淀法,在TiO2颗粒表面包覆ATO制备ATO/TiO2复合粉体.研究了复合粉体的形态结构、ATO含量对ATO/TiO2复合粉体电阻率的影响,并对导电机理进行了讨论.研究结果表明,ATO以非晶态的形态靠范德华力与静电引力吸附在TiO2表面,ATO含量决定TiO2颗粒表面能否形成完整的导电网络基本框架.渗滤阈...

Resistivity and Conductive Mechanism of ATO/TiO2 Composite Conductive Powder Manufactured by Wet Chemical Method

A kind of conductive composite powder of TiO2 coated with Sb-doped SnO2(ATO) were prepared by wet chemical method.The morphology,resistivity,conductive mechanism of the ATO/TiO2 conductive composite powder was studied.ATO was absorbed to the surface of TiO2 particles by Van Der Waals force and electrostatic force,The complete network of conductive basic framework was determined by ATO content in TiO2 particles surface.Before reaching a percolation threshold(VC < 0.0689),the conductive ATO content was relatively smaller,the large-scale conductive network has not yet formed,so the resistivity of ATO/ TiO2 powder changed slow with ATO content.When VC=0.0689-0.1562,the probability of the chain network of conductive channel was greater,the connection between the ATO has undergone a qualitative change,and a three-dimensional conductive network structure was gradually formed,the resistivity of ATO/TiO2 conductive composite powder changed dramatically with ATO content,and when VC>0.1562,the conductive network connection became full,again the change of the resistivity of ATO/TiO2 composite powder becamed slow with ATO content.