Faculty of Chemistry, Northeast Normal University, Changchun 130024, PR China.
Faculty of Chemistry, Northeast Normal University, Changchun 130024, PR China.
Biosens Bioelectron. 2014 Jun 15;56:223-30. doi: 10.1016/j.bios.2014.01.030. Epub 2014 Jan 24.
A series of highly dispersed bimetallic PtPd alloy nanoparticles (NPs) anchored on reduced graphene oxide (RGO) have been synthesized with the assistance of ionic liquid (IL: [VEIM]BF4). Different ratios of (PtCl6)(2-) and (PdCl4)(2-) ions were firstly attached to IL functionalized graphene oxide (GO) sheets in ethylene glycol (EG), and then the encased metal ions and graphene oxide sheets were reduced simultaneously by EG with the assistance of microwave. The characterization results of scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, and X-ray diffraction (XRD) demonstrate that PtPd alloy NPs with small particle sizes are uniformly dispersed on RGO. Electrochemical measurements reveal that PtPd-IL-RGO modified electrode can directly catalyze glucose oxidation and display enhanced current response compared with PtPd-RGO (such as: a response time within 3s, a linear range from 0.1 to 22 mM at 0 V, good reproducibility, considerable stability, and excellent anti-interference to electroactive molecules and Cl(-)). The superior catalytic activity and selectivity make PtPd-IL-RGO nanomaterials very promising for applications in direct detection of glucose.
一系列高度分散的负载在还原氧化石墨烯（RGO）上的双金属 PtPd 合金纳米粒子（NPs）已经通过离子液体（IL：[VEIM]BF4）的辅助作用合成。首先，不同比例的（PtCl6）（2-）和（PdCl4）（2-）离子附着在 IL 功能化的氧化石墨烯（GO）片上，然后通过微波辅助乙二醇（EG）将包裹的金属离子和氧化石墨烯片同时还原。扫描电子显微镜（SEM）、能谱（EDS）、透射电子显微镜（TEM）、X 射线光电子能谱（XPS）、拉曼光谱和 X 射线衍射（XRD）的表征结果表明，具有小粒径的 PtPd 合金 NPs 均匀分散在 RGO 上。电化学测量表明，PtPd-IL-RGO 修饰电极可以直接催化葡萄糖氧化，并显示出比 PtPd-RGO 更高的电流响应（例如：在 0 V 下 3s 内的响应时间、0.1 至 22 mM 的线性范围、良好的重现性、相当的稳定性和对电活性分子和 Cl（-）的出色抗干扰性）。优异的催化活性和选择性使 PtPd-IL-RGO 纳米材料在葡萄糖的直接检测中具有广阔的应用前景。
