Guo Qiaohui, Wu Tingting, Liu Lijuan, Hou Haoqing, Chen Shuiliang, Wang Li
Department of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang, Jiangxi 330022, China.
J Mater Chem B. 2018 Jul 28;6(28):4610-4617. doi: 10.1039/c8tb00938d. Epub 2018 Jul 2.
The development of novel materials for facile, cost-effective and quick practical application is a demanding research interest in electroanalytical chemistry. Titanium carbide (TiC), as one of the most important transition metal carbides, exhibits good chemical stability and electrical conductivity, and its electrocatalytic activity resembles that of metals, but is much cheaper. In this work, TiC nanoparticle (NP) loaded carbon nanofiber (CNF) films (TCNFs) are synthesized using an electrospinning and carbothermal technique, which facilely maintains their structural integrity with robust adhesion. Uniform TiC NPs are firmly embedded in the surface of CNFs, which integrates the large surface area and unique 3D, porous network structure of CNFs with the good conductivity and excellent electrocatalytic activity of TiC NPs. Simultaneous electrochemical sensing of ascorbic acid (AA), dopamine (DA) and uric acid (UA) at TCNFs displays excellent peak current signals with well-defined peak potentials. The linear ranges are 0.001-1.5 mM, 0.05-160 μM and 0.001-0.875 mM for AA, DA and UA, and the corresponding detection limits are 0.3 μM, 20 nM and 0.3 μM, respectively. In addition, TCNFs show long-term sensing stability and potential applications in real samples, and behave as good anti-interference agents towards KNO, ZnSO, glucose, etc. Most importantly, unlike some common carbon-based electrochemical sensor systems, an adsorption-less response is observed for the test analytes at the TCNF electrode. TCNFs show interesting potential as candidates for the construction of electrochemical sensors.
开发用于简便、经济高效且快速实际应用的新型材料是电分析化学中一项具有挑战性的研究兴趣点。碳化钛（TiC）作为最重要的过渡金属碳化物之一，具有良好的化学稳定性和导电性，其电催化活性类似于金属，但成本要低得多。在这项工作中，采用静电纺丝和碳热技术合成了负载碳化钛纳米颗粒（NP）的碳纳米纤维（CNF）薄膜（TCNFs），该技术能轻松保持其结构完整性并具有牢固的附着力。均匀的TiC NPs牢固地嵌入CNFs表面，将CNFs的大表面积和独特的三维多孔网络结构与TiC NPs的良好导电性和优异电催化活性结合在一起。在TCNFs上同时对抗坏血酸（AA）、多巴胺（DA）和尿酸（UA）进行电化学传感显示出具有明确峰电位的优异峰值电流信号。AA、DA和UA的线性范围分别为0.001 - 1.5 mM、0.05 - 160 μM和0.001 - 0.875 mM，相应的检测限分别为0.3 μM、20 nM和0.3 μM。此外，TCNFs在实际样品中表现出长期传感稳定性和潜在应用，并且对KNO、ZnSO、葡萄糖等具有良好的抗干扰能力。最重要的是，与一些常见的基于碳的电化学传感器系统不同，在TCNF电极上对测试分析物观察到无吸附响应。TCNFs作为构建电化学传感器的候选材料显示出有趣的潜力。
