Gai Pengbo, Zhang Hejing, Zhang Yunsong, Liu Wei, Zhu Gangbing, Zhang Xiaohua, Chen Jinhua
State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, P.R. China.
J Mater Chem B. 2013 Jun 7;1(21):2742-2749. doi: 10.1039/c3tb20215a. Epub 2013 Apr 25.
Nitrogen doped porous carbon nanopolyhedra (N-PCNPs) were prepared from direct carbonization of ZIF-8 nanopolyhedra. The N-PCNPs showed uniform morphology, narrow pore-size distribution centered at 3.7 nm, high surface area (2221 m g) and good electrochemical properties and were used to modify a glassy carbon electrode to electrochemically detect ascorbic acid (AA), dopamine (DA) and uric acid (UA). Compared with the bare GC electrode and reduced graphene oxide modified glassy carbon (rGO/GC) electrode, the N-PCNPs modified GC electrode (N-PCNPs/GC) was found to perform better toward electrocatalytic oxidation of AA, DA and UA. For simultaneous sensing of three analytes, three well-separated voltammetry peaks were obtained using the N-PCNPs/GC electrode in differential pulse voltammetry measurements, and the corresponding peak separations between AA and DA, DA and UA were 228 mV, 124 mV respectively. The linear response ranges for the determination of AA, DA and UA were 80-2000 μM, 0.5-30 μM and 4-50 μM, respectively, and the detection limits (S/N = 3) were 740 nM, 11 nM and 21 nM, respectively. Furthermore, the N-PCNPs/GC electrode showed good reproducibility and stability. The attractive features of N-PCNPs provided potential applications in the simultaneous determination of UA, AA and DA.
氮掺杂多孔碳纳米多面体（N-PCNPs）通过ZIF-8纳米多面体的直接碳化制备而成。N-PCNPs呈现出均匀的形态，孔径分布狭窄，中心位于3.7 nm，具有高比表面积（2221 m²/g）和良好的电化学性能，并被用于修饰玻碳电极以电化学检测抗坏血酸（AA）、多巴胺（DA）和尿酸（UA）。与裸玻碳电极和还原氧化石墨烯修饰的玻碳（rGO/GC）电极相比，发现N-PCNPs修饰的玻碳电极（N-PCNPs/GC）对AA、DA和UA的电催化氧化表现更佳。对于三种分析物的同时传感，在差分脉冲伏安法测量中使用N-PCNPs/GC电极获得了三个完全分离的伏安峰，AA与DA、DA与UA之间的相应峰间距分别为228 mV、124 mV。测定AA、DA和UA的线性响应范围分别为80 - 2000 μM、0.5 - 30 μM和4 - 50 μM，检测限（S/N = 3）分别为740 nM、11 nM和21 nM。此外，N-PCNPs/GC电极表现出良好的重现性和稳定性。N-PCNPs的诱人特性为UA、AA和DA的同时测定提供了潜在应用。
