Noncovalent functionalization of carbon nanotubes with sodium lignosulfonate and subsequent quantum dot decoration
Noncovalent functionalization of carbon nanotubes with sodium lignosulfonate and subsequent quantum dot decoration
复制标题
木质素磺酸钠对碳纳米管的非共价功能化及随后的量子点修饰
DOI：
10.1021/jp066018z
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发表时间：
2007-01-25
影响因子：
3.7
通讯作者：
Sun, Jing
中科院分区：
文献类型：
--
作者：
Liu, Yangqiao;Gao, Lian;Sun, Jing
开发了一种新的非共价方法，利用纤维素工业中获得的一种生物聚合物-木质素磺酸钠(SLS)来功能化多壁碳纳米管(MWNTs)。采用简单的物理研磨技术，制备的SLS功能化多壁碳纳米管在水中分散良好，当量溶解度高达1.5 mg/m L，并可保持3个月以上的稳定性。用透射电子显微镜、拉曼光谱和Zeta电位测量对SLS功能化的多壁碳纳米管进行了表征。认为pi-pi堆积和疏水相互作用是SLS与MWNTs相互作用的主要机制，SLS的阴离子聚合性通过空间位阻赋予了MWNTs的高稳定性。利用SLS功能化的多壁碳纳米管表面的各种阴离子基团作为锚定中心，采用原位形成的方法，在多壁碳纳米管表面可控地、均匀地修饰尺寸为4-6 nm的SnO2和CDS量子点。这些多壁碳纳米管/量子点杂化材料在水中高度分散，从而为其潜在的技术应用打开了可能性。
A novel noncovalent approach is developed for the functionalization of multimalled carbon nanotubes (MWNTs) using a biopolymer obtained in the cellulose industry-sodium lignosulfonate (SLS). Using a simple physical grinding technique, the SLS-functionalized MWNTs can be well-dispersed in water with a MWNTs-equivalent solubility as high as 1.5 mg/mL, and the high stability can be maintained for more than 3 months. The SLS-functionalized MWNTs have been characterized by transmission electron microscopy (TEM), Raman spectra, and zeta-potential measurements. It is proposed that pi-pi stacking and the hydrophobic interactions are dominant mechanisms for the interaction between SLS and MWNTs, and the anionic polymeric nature of SLS imparts the high stability of MWNTs via the electrosteric repulsion. By taking advantage of the diverse anionic groups on the SLS-functionalized MWNTs as anchorage centers, SnO2 and CdS quantum dots with the size of 4-6 nm are controllably and uniformly decorated on the MWNTs surface using an in-situ formation method. These MWNTs/quantum dot hybrid materials are highly dispersible in water, thus opening possibilities for their prospective technological applications.