Catalytic Growth Of Carbon Nanotubes By Inorganic Nanoparticles Prepared By Self-assembling On Substrate And Their Sensing Property

Since 1991 carbon nanotubes(CNTs) have been widely used in different fields because of their unique structure and excellent properties. CNT-based chem/biosensor for detection of biological macromolecules is one of the important fields. This type of sensor can improve the performance of traditional sensors including detection temperature, sensitivity and detection limitation etc., and also now type of sensor can be developed based on CNTs. The controlled growth of the CNTs is one of the key issues for realizing the goal. In this issues, a new method to prepare inorganic nanoparticles for growing CNTs on substrate by self-assembling that been developed. The method not only provide a way to grow single-walled CNTs(SWNTs) with high percentage of semiconductor-type SWNTs, but also broaden the catalyst system for CNTs growth. Meanwhile this thesis also construct a Au-SWNTs electrode as electrochemical sensor for detecting DNA. The main work is as follows:(1)A self-assemble method has been developed to fabricate inorganic nanoparticles on substrate which can be applied for the growth of semiconducting-riched SWNTs by CVD. Brodening the metal-free catalysts for growth CNTs.(2)A SWNTs-Au hybrid electrode based on autocatalytic growth of AuNPs which can be as a conductive bridge for regulating the electrical signal into a specific DNA detect has been constructed. In this scenario,AuNPs can be different degree of growth because of different force between ds-DNA and ss-DNA with AuNPs. So the conductivity of Au-SWNTs changes. Experimental results show that Au-SWNTs hybrid electrode can effectively detect the DNA.