Template-free synthesis of an electroactive Au-Calix-PPY nanocomposite for electrochemical sensor applications
Template-free synthesis of an electroactive Au-Calix-PPY nanocomposite for electrochemical sensor applications
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DOI：
10.1039/c2gc16232f
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发表时间：
2012-01
期刊：
影响因子：
9.8
通讯作者：
Shivani Tanwar;Min-Chieh Chuang;K. S. Prasad;J. Ho
中科院分区：
文献类型：
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作者：
Shivani Tanwar;Min-Chieh Chuang;K. S. Prasad;J. Ho
本文描述了一种伴随同时氧化还原反应的纳米复合材料的无模板合成的简单绿色方法。金（21.35%）和掺杂有4-磺基杯[4]芳烃的聚吡咯存在于所获得的具有在30至50 nm范围内的均匀尺寸的纳米珠中。选择通用溶剂（水）用于合成，当上述三种组分一个接一个地快速添加时，允许形成纳米复合材料。研究了反应时间、反应温度、掺杂剂、4-磺酸基杯[4]芳烃和金的浓度对纳米复合材料合成的影响。目前的工作集中在高度电活性的纳米复合材料，可以在没有外部添加剂/模板的情况下合成;和从绿色化学方法，其中HAuCl 4作为氧化剂以及聚合物的稳定剂，这使得合成更具建设性，以避免使用有害的有机溶剂。为了比较，我们还合成了掺杂有4-磺基杯[4]芳烃（Calix-PPY）的聚吡咯（PPY），但合成是在氧化剂（过硫酸铵）存在下进行的，其支持吡咯的聚合。Au-Calix-PPY修饰电极对甲醛和葡萄糖具有较好的传感性能。采用紫外-可见光谱、红外光谱、拉曼光谱、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、动态光散射（DLS）、能量色散X射线能谱（EDX）和X射线光电子能谱（XPS）对材料进行了表征。结果表明，所得的Au-Calix-PPY纳米复合材料具有显着的电化学活性，并成功地证明在传感甲醛和葡萄糖，分别。
A simple green approach to the template-free synthesis of a nanocomposite material accompanied with a simultaneous redox reaction is described herein. Gold (21.35%) and polypyrrole doped with 4-sulfocalix[4]arene consist in the as-obtained nanobeads with a uniform size in the range of 30 to 50 nm. Universal solvent (water) was selected for the synthesis, allowing the formation of the nanocomposite when the fast addition of the above three components takes place one after the other. The effects of reaction time, temperature, and the concentrations of the dopant, 4-sulfocalix[4]arene and gold on the synthesis of the nanocomposite were also investigated. The current work focuses on the highly electroactive nanocomposite which can be synthesized in the absence of an external additive/template; and from the green chemistry approach, where HAuCl4 serves as an oxidizing agent as well as a stabilizer for the polymer, which makes the synthesis more constructive to avoid the use of hazardous organic solvents. For comparison, we also synthesized polypyrrole (PPY) doped with 4-sulfocalix[4]arene (Calix-PPY), but the synthesis was carried out in the presence of the oxidizing agent (ammonium persulfate), that endorses polymerization of the pyrrole. The Au-Calix-PPY modified electrodes have long-time stability for sensing formaldehyde and glucose. The materials synthesized herein were characterized by UV-visible spectroscopy, FT-IR spectroscopy, Raman spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), dynamic light scattering (DLS), energy-dispersive X-ray spectroscopy (EDX) and X-ray photoelectron spectroscopy (XPS). It was revealed that the resulting Au-Calix-PPY nanocomposite exhibits significant electrochemical activity and is successfully demonstrated in sensing formaldehyde and glucose, respectively.