Wang Suiping, Lu Limin, Yang Minghui, Lei Yong, Shen Guoli, Yu Ruqin
State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, PR China.
Anal Chim Acta. 2009 Oct 5;651(2):220-6. doi: 10.1016/j.aca.2009.09.004. Epub 2009 Sep 6.
In this paper, for the first time, we introduced the seed-mediated method to the growth of cobalt hexacyanoferrate nanoparticles (CoNPs), using 3.5 nm gold nanoparticles as seeds and multiwalled carbon nanotubes (MWCNTs) as growth scaffold which would both show synergistic action toward the reduction of H2O2. Via gold seeds, the one-step fabrication of CoNPs on the glassy carbon electrode is simple without any linking reagents, which will ingeniously exert the electrochemical properties of cobalt hexacyanoferrate. Combined with glucose oxidase, the sensing surface is applied as a biosensor for glucose. The growth of CoNPs is a chemical deposition process around the small Au nanoseed particles. The nanoseeds bridge the CoNPs and CNTs to form a smart nanocomposite. Spherical CoNPs have a relatively moderate dispersion on the three-dimensional network of CNTs with relatively even diameter ca. 100 nm. Whereas, in the control experiments without gold seeds cobalt hexacyanoferrate can only form continuous films, of which the size is far from nanolevel and the catalytic ability is poor. The synthesis and fabrication/modification of CoNPs are simple and fast without prior preparation of CoNPs and lengthy process of cross-linking. The amount of the seeds and CNTs, growth time and concentration of growth solution were investigated. Scanning electron microscopy (SEM) and electrochemical method were used.
在本文中，我们首次将种子介导法引入到六氰合铁酸钴纳米颗粒（CoNPs）的生长过程中，使用3.5纳米的金纳米颗粒作为种子，并以多壁碳纳米管（MWCNTs）作为生长支架，二者对过氧化氢的还原均表现出协同作用。通过金种子，在玻碳电极上一步制备CoNPs简单易行，无需任何连接试剂，这将巧妙地发挥六氰合铁酸钴的电化学性质。结合葡萄糖氧化酶，该传感表面被用作葡萄糖生物传感器。CoNPs的生长是围绕小的金纳米种子颗粒的化学沉积过程。纳米种子将CoNPs和CNTs连接起来形成一种智能纳米复合材料。球形CoNPs在直径约100纳米且相对均匀的CNTs三维网络上具有相对适中的分散性。然而，在没有金种子的对照实验中，六氰合铁酸钴只能形成连续的膜，其尺寸远非纳米级别且催化能力较差。CoNPs的合成及制备/修饰简单快速，无需预先制备CoNPs以及冗长的交联过程。研究了种子和CNTs的用量、生长时间以及生长溶液的浓度。使用了扫描电子显微镜（SEM）和电化学方法。
