The Application Of Ordered Mesoporous Carbon And Its Composite Materials In Electrochemical Sensor

In recent years, there has been considerable interest in a novel material, i.e., ordered mesoporous carbon (OMC), which was first synthesized in 1999. OMC could be promising candidates for catalyst supports, adsorbents, energy storage media especially because of its admirable properties, such as extremely high specific surface area, large pore volume as well as electrical conductivity. The mesoporous carbons are intrinsically conductors and easy to synthesize. Hence, more and more attention was focused on the electrochemistry and electrocatalysis of OMC and the composite materials as advanced electrode materials. So we have investigated the electrochemistry and electrocatalysis of OMC and the composite materials based on it. This dissertation mainly consists of the following several aspects:(1) In this work, we reported on simultaneous determination of nitrophenol isomers by voltammetry with OMC modified glassy carbon electrode.The ordered mesoporous carbon modified electrode showed a good electrocatalytic response towards nitrophenol isomers and the detection sensitivity was improved dramatically. The reduction peak potential difference between o-nitrophenol and m-nitrophenol was 224 mV, m-nitrophenol and p-nitrophenol 188 mV, which indicated that the o-nitrophenol, m-nitrophenol and p-nitrophenol could be identified entirely at the ordered mesoporous carbon modified electrode. There is a good linear correlation between peak current (Ip) and concentration (C) of each nitrophenol in the presence of other two nitrophenol compounds.(2) We investigated the electrochemical behaviors of guanine (G) and adenine (A) on the OMC/GC electrode by voltammetry. The voltammtric studies suggested that the OMC film exhibited excellent electrocatalytic activity to the oxidation of G and A. The modified electrode exhibited good stability, reproducibility and sensitivity, G and A can effectively accumulate at this electrode. In the presence of 1.0×10-4 mol L-1 A, a linear range of 0.4×10-5 mol L-1 to 1.0×10-3 mol L-1 for G with the detection limit about 5.80×10-8 mol L-1; a linear range of 0.4×10-5 mol L-1 to 7.0×10-4 mol L-1 for A coexisting with 0.5×10-4 mol L-1 G, and its detection limit is 7.45×10-8 mol L-1 (S/N= 3).(3) Cerium (Ⅲ) 12-tungstophosphoric acid (CePW)/OMC composite was fabricated by dipping acid - OMC in the mixing solution of Cerium (Ⅲ) nitrate and 12-tungstophosphoric acid, and the composite was characterized by FT infrared spectroscopy (FTIR), X-ray powder diffraction (XRD) and Raman spectroscopy. CePW was deposited on OMC, and linked with each other, which enhanced the specific surface area and the electrocatalytic activity. With these advantages of OMC and good catalytic activities of CePW, we fabricated CePW/OMC modified electrode. The voltammetry studies demonstrated that CePW/OMC/GC electrode has high stability, fast response and good electrocatalytic activity to guanine, adenine, acetaminophen and dopamine.