INSTM Bergamo R.U. and Department of Engineering and Applied Sciences, University of Bergamo, I-24044 Dalmine (BG), Italy.
Nanotechnology. 2017 Mar 1;28(13):135501. doi: 10.1088/1361-6528/aa5e80. Epub 2017 Feb 6.
In this study, we report the preparation of a novel nanocomposite, 5-aza[5]helicene-CHO-CO-MWCNTs, obtained by grafting the 5-aza[5]helicene moiety on the surface of multi-walled carbon nanotubes (MWCNTs). Thermogravimetry (TGA), Fourier transform-infrared spectroscopy (FTIR), ultraviolet (UV), and photoluminescence (PL) measurements provided evidence that the organic moiety is covalently grafted to the MWCNTs. The 5-aza[5]helicene-CHO-CO-MWCNTs nanocomposite was utilized to fabricate modified commercial screen-printed carbon electrodes. Its electrochemical behavior was studied in neutral buffer solution in the presence of ferricyanide and hydroquinone (HQ). Finally, the electrochemical sensing of epinephrine in the presence of ascorbic acid by using the linear sweep voltammetry (LSV) technique was investigated. Results have demonstrated the enhanced electrocatalytic activity and excellent ability of the 5-aza[5]helicene-CHO-CO-MWCNTs-modified electrode in the separation between the anodic peaks of epinephrine (EP) and ascorbic acid (AA), even in the presence of a high amount of AA, with a detection limit (S/N = 3) of 5 μmol l.
在这项研究中，我们报告了一种新型纳米复合材料的制备，该复合材料是通过将 5-氮杂[5]螺旋-CH0-CO-MWCNTs 部分接枝到多壁碳纳米管 (MWCNTs) 表面而得到的。热重分析 (TGA)、傅里叶变换红外光谱 (FTIR)、紫外 (UV) 和光致发光 (PL) 测量结果表明，有机部分通过共价键接枝到 MWCNTs 上。将 5-氮杂[5]螺旋-CH0-CO-MWCNTs 纳米复合材料用于制备修饰的商用丝网印刷碳电极。在中性缓冲溶液中存在铁氰化物和对苯二酚 (HQ) 的情况下，研究了其电化学行为。最后，通过线性扫描伏安法 (LSV) 技术研究了在抗坏血酸存在下肾上腺素的电化学传感。结果表明，5-氮杂[5]螺旋-CH0-CO-MWCNTs 修饰电极具有增强的电催化活性和优异的分离能力，即使在存在大量抗坏血酸的情况下，也能分离肾上腺素 (EP) 和抗坏血酸 (AA) 的阳极峰，检测限 (S/N = 3) 为 5 μmol l。
