将多壁碳纳米管(MWCNT)置于混酸(硝酸∶硫酸=1∶3)中,利用超声波振荡截短碳纳米管、并使其与羧基链接,而后基于阳离子聚合电解质壳聚糖(CS)和阴离子短切碳纳米管之间的静电作用,在玻璃衬底上通过层层的模式均匀稳定地自组装形成复合壳聚糖多层膜.UV-vis 光谱显示:组装过程呈现均匀而连续的生长.AFM和SEM观察表明:CS/MWCNT多层膜具有良好的光学特性,在生物传感器方面具有潜在的应用前景.
Multiwalled carbon nanotubes (MWCNTs) were treated in 1∶3 concentrated nitric-sulfuric acid to cut them into short tubes and to create carboxyl groups at their ends. Homogeneous multilayer films of the shortened MWCNTs were assembled on a silica glass substrate by a layer-by-layer method, based on electrostatic interaction of positively charged cationic polyelectrolyte chitosan (CS) and the negatively charged and shortened MWCNTs. The film assembly and characteristics of the CS/MWCNT multilayer films were investigated. The process of assembly was monitored through ultraviolet-visible spectroscopy, which indicated homogeneous and consecutive growth. Atomic force microscopy and scanning electron microscopy were used to characterize the surface of the films. The films showed stable optical properties and were promising as biosensors.
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