A novel cobalt hexacyanoferrate nanocomposite on CNT scaffold by seed medium and application for biosensor.
A novel cobalt hexacyanoferrate nanocomposite on CNT scaffold by seed medium and application for biosensor.
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DOI：
10.1016/j.aca.2009.09.004
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发表时间：
2009-10
影响因子：
6.2
通讯作者：
Suiping Wang;Limin Lu;Minghui Yang;Y. Lei;Guoli Shen;R. Yu
中科院分区：
文献类型：
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作者：
Suiping Wang;Limin Lu;Minghui Yang;Y. Lei;Guoli Shen;R. Yu
本文首次将种子介导的方法引入到六氰高铁酸钴纳米颗粒（CoNPs）的生长中，以3.5nm的金纳米颗粒为种子，多壁碳纳米管（MWCNTs）为生长支架，两者对H2O2的还原均表现出协同作用。通过金籽在玻碳电极上一步制备CoNPs，简单，无需任何连接试剂，巧妙地发挥了六氰高铁酸钴的电化学性能。该传感表面与葡萄糖氧化酶结合，作为葡萄糖的生物传感器。CoNPs的生长是一个围绕小金纳米粒子的化学沉积过程。纳米种子将CoNPs和cnt连接起来，形成智能纳米复合材料。球形CoNPs在直径约为100nm的相对均匀的CNTs三维网络上具有相对温和的分散。而在没有金种子的对照实验中，六氰高铁酸钴只能形成连续膜，且膜的尺寸远未达到纳米级，催化能力较差。CoNPs的合成和制备/改性简单、快速，无需事先制备CoNPs，也无需漫长的交联过程。考察了种子和碳纳米管的用量、生长时间和生长液浓度。采用扫描电子显微镜（SEM）和电化学方法。
In this paper, for the first time, we introduced the seed-mediated method to the growth of cobalt hexacyanoferrate nanoparticles (CoNPs), using 3.5nm 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. 100nm. 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.