摘要
本论文采用直流复合电沉积技术实现了常温下铜(氧化铜)与碳纳米管、镍(氧化镍)与碳纳米管的复合,制备了铜(氧化铜)／单壁碳纳米管和镍(氧化镍)／单壁碳纳米管复合材料。采用UV-vis-NIR, Raman、SEM、TEM等表征方法对上述复合材料进行了表征。
Raman、SEM、TEM研究表明：在电沉积过程中,阴极得到的大部分金属(金属氧化物)／半导体型碳纳米管复合物；电解液中得到的大部分是金属(金属氧化物)／金属型碳纳米管复合物。本实验能够在一定程度上实现了金属型和半导体型碳纳米管的分离。
研究表明,金属及其氧化物是以两种方式与碳纳米管结合的：第一种方式为金属及其氧化物粒子被包裹在碳纳米管管束之间；第二种方式为金属及其氧化物粒子均匀分布在碳纳米管管束的外侧。
实验中还尝试使用多壁碳纳米管、功能化的碳纳米管进行直流电沉积。接着,又将上述所有复合物材料进行了NO气氛下的气敏性能测试,研究发现金属氧化物／半导体型碳纳米管复合物所制成的气敏材料,响应时间短,灵敏度高,可用于制备性能优良的检测NOx含量的电化学传感器。
In this paper, Cu(CuO)/Single wall carbon nanotubes(SWCNTs), Ni(NiO)/Single wall carbon nanotubes(SWCNTs) composites were synthesized by electrodeposition method at room temperature. The as-produced composites were characterized by UV-vis-NIR, Raman, SEM and TEM for the study of their content and morphology.
The results of Raman, SEM and TEM showed that in the electrodeposition most of metal(metal oxide)/semiconducting SWCNTs was deposited onto the cathode, and most of the metal(metal oxide)/metallic SWCNTs remained in the electrolyte. So the semiconducting and metallic SWCNTs were separated to a certain extent, and at the same time the semiconducting SWCNTs composite material was produced.
It was investigated that the metal and metal oxide particles contacting with SWCNTs in two ways:One was through which metal oxide particles were uniformly located on the outside of the thin SWCNTs bundles; the other way was through which metal oxide particles were wrapped into the interspace of the SWCNTs bundles.
In the electrodeposition process, other types of CNTs such as MWCNTs, functionalized CNTs were attempted. All the above composites were tested in the NO atmosphere for the study of their gas-sensor determinating characteristics. And the results showed that the above composites behaved well in the gas-determinating tests, they were suitable for the application in the electrical gas sensor instruments for NOx with high sensitivity and short response time.
引文
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