金-钯纳米粒子/质子化碳化氮/MXene复合材料的制备及对核黄素、槲皮素同步电化学检测

Preparation of protonated carbon nitride/transition metal carbide composites loaded with gold-palladium bimetallic metal nanoparticles and simultaneous electrochemical response to riboflavin and quercetin

采用逐步静电自组装及冰晶模板法制备了负载有金-钯双金属纳米颗粒(Au-Pd NPs)的Au-Pd/H-C_(3)N_(4)/Ti_(3)C_(2)T_(x)复合材料,并用于对核黄素(Rf)和槲皮素(Qu)的定量同步电化学检测研究。结果表明,Au-Pd NPs的引入进一步改善了材料的导电性和电催化活性,加快了H-C_(3)N_(4)与Ti_(3)C_(2)T_(x)之间的电子转移并提供了部分活性位点,提高了复合材料的电化学性能。该复合材料对Rf和Qu具有良好的电化学传感性能,实现了对Rf和Qu的单独电化学检测。结合不同浓度比条件下Rf和Qu的电流响应矩阵模型及对应拟合方程,表明该复合材料能够实现对Rf和Qu的同步定量电化学检测,在最佳实验条件下对Rf和Qu的检测限能够达到5.62 nM(Rf)和20.1 nM(Qu)。

With the help of electrostatic self-assembly and ice-crystal template,bimetallic metal nanoparticles(Au-Pd NPs)were introduced into the H-C_(3)N_(4)/Ti_(3)C_(2)T_(x)for the synthesis of Au-Pd/H-C_(3)N_(4)/Ti_(3)C_(2)T_(x),which is used for quantitative simultaneous electrochemical detection of riboflavin(Rf)and quercetin(Qu).The introduction of Au-Pd NPs increased the electrical conductivity and provided some active sites,which accelerated the electron transfer between H-C_(3)N_(4)and Ti_(3)C_(2)T_(x)and enhanced electrocatalytic activity of the material.Therefore,the electrochemical performance of the composite was improved.The composite with good electrochemical sensing performance achieved separate electrochemical detection of Rf and Qu.The current response matrix model and corresponding fitting equations for Rf and Qu at different concentration ratios showed that the composite material was capable of simultaneous quantitative electrochemical detection of Rf and Qu,with detection limits of 5.62 nM(Rf)and 20.1 nM(Qu)under optimal experimental conditions.