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Nanoporous Gold Electrodes with Tuneable Pore Sizes for Bioelectrochemical Applications

机译：用于生物电化学应用的孔径可调的纳米多孔金电极

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Nanoporous gold (NPG) fabricated by sputtering is a material of versatile morphology with pores whose size can be tailored to accommodate enzymes. The process of pore formation and the size of the pores in NPG are influenced by the composition of Au and Ag in the alloy used to prepare the electrodes together with the temperature and time period of the dealloying process. On increasing the time from 1 to 60 min and the temperature from 0.5 degrees C to 60.5 degrees C in concentrated HNO3, significant increases in the average pore diameters from 4.4 to 78 nm were observed with simultaneous decreases in the roughness factor (R-f). The pores of NPG were fully addressable regardless of the diameter, with R-f increasing linearly up to an alloy thickness of 500 nm. The influence of the pore size on the bioelectrochemical response of redox proteins was evaluated using cytochrome c as a model system. The highest current densities of ca. 30 mu A cm(-2) were observed at cytochrome c modified NPG electrodes with an average pore size of ca. 10 nm. The pores in NPG were also tuned for the mediatorless immobilization of Myrothecium verrucaria bilirubin oxidase. High current densities of ca. 65 mu A cm(-2) were observed at MvBOD modified NPG electrodes prepared by dealloying at 0.5 degrees C for 5 min with an average pore size of 8 nm, which is too small to accommodate the enzyme into the pores, indicating that the response was from enzyme adsorbed on the electrode surface.
机译：通过溅射制造的纳米孔金（NPG）是一种具有多种形态的材料，其孔可以定制以容纳酶。 NPG中孔的形成过程和孔的大小受用于制备电极的合金中金和银的成分以及脱合金过程的温度和时间的影响。在浓硝酸中，将时间从1分钟增加到60分钟，温度从0.5摄氏度增加到60.5摄氏度，平均孔径显着增加，从4.4纳米增加到78纳米，同时粗糙度系数（R-f）减小。 NPG的孔可以完全寻址，而与直径无关，R-f线性增加直至合金厚度为500 nm。使用细胞色素c作为模型系统评估了孔径对氧化还原蛋白生物电化学反应的影响。最高电流密度约为在细胞色素c修饰的NPG电极上观察到30μA cm（-2），平均孔径约为。 10纳米还对NPG中的孔进行了调节，以用于无疣状Myrothecium v​​errucaria胆红素氧化酶的固定。高电流密度约在MvBOD修饰的NPG电极上观察到65μA cm（-2），该电极是通过在0.5摄氏度下脱合金5分钟而制备的，平均孔径为8 nm，该孔径太小，无法容纳酶进入孔中，表明该响应来源于电极表面吸附的酶。

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