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通过不同官能团功能化,在单壁碳纳米管(SWNTs)上连接不同基团并制成薄膜。采用恒定电位法,将它们暴露在NO2中,N2作为载气,不同温度下(30℃、50℃、70℃、90℃)检测电流随时间的变化情况(I-t图)。结果表明,随着温度的升高各薄膜对NO2的响应速率加快;含对苯基的SWNTs薄膜在50℃灵敏度最大,而连接有羧基、氨基的SWNTs薄膜在30℃灵敏度最大;对硝基苯基功能化后的SWNTs对NO2的响应程度最大,明显强于其他薄膜。
Functionalized by different functional groups, different groups are connected to SWNTs and made into thin films. They were exposed to NO2 using constant potential method, and N2 was used as a carrier gas to measure the change of current with time at different temperatures (30 ℃, 50 ℃, 70 ℃, 90 ℃) (Fig. I-t). The results showed that the response speed of NO2 films increased with the increase of temperature. The SWNTs films containing p-phenyl groups showed the highest sensitivity at 50 ℃, while the SWNTs films with carboxyl groups and amino groups attached at 30 ℃ showed the highest sensitivity. The functionalized SWNTs have the highest response to NO2, which is obviously stronger than other films.