为开发NO气敏传感器,采用β-环糊精对模板法制备的多壁碳纳米管进行了表面修饰改性.利用扫描电镜、红外光谱、X-射线衍射、热分析-质谱等表征手段研究了改性的MWCNTs的结构性能,并对NO的吸附-脱附作用机理进行了讨论.结果表明:环糊精的小口端易与多壁碳纳米管的管壁相互作用并结合在一起,使环糊精包覆在多壁碳纳米管的表面.多壁碳纳米管外或内层的环糊精可以通过氢键与环糊精以层与层的方式进行连接,达到对MWCNTs的多层改性修饰作用.XRD研究证明经环糊精改性的多壁碳纳米管其结构并没有发生变化.热分析质谱研究发现,β-环糊精改性的MWCNTs对NO的吸附-脱附能力均大于未改性的MWCNTs,其中MWCNTs吸附NO主要是表面物理吸附和管体空腔内的化学吸附;而经β-环糊精修饰的MWCNTs除本身能够吸附NO外,其表面包覆的β-环糊精空腔也能够吸附NO分子,并与NQ形成非共价键吸附.β-环糊精与MWCNs质量比为10:1时,其吸附NO的量最大,是未改性MWCNTs的1.69倍.
Multi-walled carbon nanotubes (MWCNTs) modified by β-cyclodextrin were synthesized in order to provide a theoretical basis for developing gas sensors for NO detection. The MWCNTs were characterized by SEM, FT-IR and XRD. NO adsorption-desorption was detected by TG-MS, and the mechanism of NO adsorption was discussed. Results demonstrate that the small tip of cone-shaped β-cyclodextrin reacts with walls of MWCNTs, and p-cyclodextrin located on MWCNTs inside or outside has strong interactions act as hydrogen-bonding and binds each other layer by layer, which makes MWCNTs modified by β-cyclodextrin in a multilateral layer way. XRD results show that the structure of MWCNTs has no change. The capability of NO adsorption-desorption of MWCNTs modified by p-cyclodextrin is obviously higher than that of pure MWCNTs. NO adsorption can be attributed to the physical adsorption on the surface of MWCNTs and the chemical adsorption inside MWCNTs. At the same time, NO can be also adsorbed in the cavity of β-CD on MWCNTs, which forms non-covalent bond with NO molecule. While the mass ratio ofβ -CD to MWCNTs is 10:1, the best NO adsorption can be achieved.
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