Tseng Chun-Hao, Chen Chuh-Yung
Department of Chemical Engineering, National Cheng Kung University, 70101, Tainan, Taiwan.
Nanotechnology. 2008 Jan 23;19(3):035606. doi: 10.1088/0957-4484/19/03/035606. Epub 2007 Dec 11.
This study presents a novel method for preparing multi-walled carbon nanotubes (MWNTs) grafted with a poly(2-hydroxyethyl methacrylate) (HEMA)-silver complex (CNTs-HEMA-Ag complex) through plasma-induced grafting polymerization. The characteristics of the MWNTs after being grafted with HEMA polymer are monitored by Fourier transform infrared (FT-IR) spectroscopy. The chelating groups in the HEMA polymer grafted on the surface of the CNTs-HEMA are the coordination sites for chelating silver ions, and are further used as nanotemplates for the growing of Ag nanoparticles (quantum dots). Transmission electron microscopy (TEM) reveals that the particle size of Ag nanoparticles on the CNT surfaces increases with the Ag(+) chelating concentration, reaction time, and reaction temperature. Moreover, the crystalline phase of Ag nanoparticles is identified by using x-ray diffraction (XRD). In addition, high-resolution x-ray photoelectron spectroscopy (XPS) is used to characterize the functional groups on the surface of the MWNTs after chemical modification through plasma treatment; it demonstrates that the growing amount of the Ag nanoparticles on the nanotubes increases with the Ag(+) chelating concentration due to the blocking effect of the Ag particles forming on the MWNTs.
本研究提出了一种通过等离子体诱导接枝聚合制备接枝有聚（甲基丙烯酸2-羟乙酯）（HEMA）-银络合物（CNTs-HEMA-Ag络合物）的多壁碳纳米管（MWNTs）的新方法。通过傅里叶变换红外（FT-IR）光谱监测接枝HEMA聚合物后的MWNTs的特性。接枝在CNTs-HEMA表面的HEMA聚合物中的螯合基团是螯合银离子的配位位点，并进一步用作Ag纳米颗粒（量子点）生长的纳米模板。透射电子显微镜（TEM）显示，CNT表面上Ag纳米颗粒的粒径随Ag(+)螯合浓度、反应时间和反应温度的增加而增大。此外，通过X射线衍射（XRD）确定Ag纳米颗粒的晶相。另外，高分辨率X射线光电子能谱（XPS）用于表征经等离子体处理化学改性后的MWNTs表面的官能团；结果表明，由于在MWNTs上形成的Ag颗粒的阻挡作用，纳米管上Ag纳米颗粒的生长量随Ag(+)螯合浓度的增加而增加。
