Fujian Key Lab of Medical Instrument & Pharmaceutical Technology, Yishan Campus, Fuzhou University, Fuzhou, Fujian 350002, China; Institute of Research for Functional Materials, Fuzhou University, Yishan Campus, Fuzhou University, Fuzhou, Fujian 350002, China; College of Chemistry and Chemical Engineering, Qishan Campus, Fuzhou University, Fuzhou, Fujian 350108, China.
Institute of Research for Functional Materials, Fuzhou University, Yishan Campus, Fuzhou University, Fuzhou, Fujian 350002, China; College of Chemistry and Chemical Engineering, Qishan Campus, Fuzhou University, Fuzhou, Fujian 350108, China.
Mater Sci Eng C Mater Biol Appl. 2014 May 1;38:39-45. doi: 10.1016/j.msec.2014.01.037. Epub 2014 Jan 29.
Hexagonal Ag nanoplates (NPs) were synthesized by polyvinylpyrrolidone (PVP) and trisodium citrate (TSC) which selectively absorbed to Ag (100) and Ag (111) surfaces, then were anchored to graphene (GN) to form novel Ag NPs/GN composite. The thickness of Ag NPs is ~4 nm and the length is 18-66 nm. Transmission electron microscopy (TEM) image shows that the plates are f-c-c crystals containing {111} facets on their two planar surfaces. Zeta potential indicated that the surface of Ag NPs/GN is negatively charged while vanillin is positively charged. Thus Ag NPs/GN modified on glass carbon electrodes (GCE) allowed abundant adsorption for vanillin and electron transfer between vanillin and Ag NPs/GN/GCE. Square wave voltammetry (SWV) results indicated that the over potential on Ag NPs/GN/GCE negatively shifts 52 mV than that on Ag NPs/GCE. Ag NPs/GN with enhanced surface area and good conductivity exhibited an excellent electrocatalytic activity toward the oxidation of vanillin. The corresponding linear range was estimated to be from 2 to 100 μM (R(2)=0.998), and the detection limit is 3.32×10(-7) M (S/N=3). The as-prepared vanillin sensor exhibits good selectivity and potential application in practical vanillin determination.
六方 Ag 纳米板 (NPs) 是通过聚乙烯吡咯烷酮 (PVP) 和柠檬酸三钠 (TSC) 合成的，它们选择性地吸附在 Ag (100) 和 Ag (111) 表面上，然后固定在石墨烯 (GN) 上，形成新型 Ag NPs/GN 复合材料。Ag NPs 的厚度约为 4nm，长度为 18-66nm。透射电子显微镜 (TEM) 图像显示，这些薄片是 fcc 晶体，在其两个平面表面上含有 {111} 面。Zeta 电位表明，Ag NPs/GN 的表面带负电荷，而香草醛带正电荷。因此，修饰在玻碳电极 (GCE) 上的 Ag NPs/GN 允许香草醛大量吸附，并促进香草醛与 Ag NPs/GN/GCE 之间的电子转移。方波伏安法 (SWV) 结果表明，Ag NPs/GN/GCE 的过电势比 Ag NPs/GCE 的过电势负移 52mV。Ag NPs/GN 具有增强的表面积和良好的导电性，对香草醛的氧化表现出优异的电催化活性。相应的线性范围估计为 2 至 100μM（R(2)=0.998），检测限为 3.32×10(-7)M（S/N=3）。所制备的香草醛传感器具有良好的选择性和在实际香草醛测定中的潜在应用。
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