基于分子的六氰合铁酸钴纳米粒子：合成，表征及其电化学性质

采用直接混合法制得平均尺寸小于50 nm的六氰合铁酸钴纳米粒子，元素分析表明其计量学分子式为K_0.2Co_1.4Fe(CN)₆]•xH₂O，红外光谱证明此物质是由铁磁性的Co^II_1.5Fe^III(CN)₆]和反铁磁性的KCo^IIIFe^II(CN)₆]组成，并含有一定量的结晶水。用六氰合铁酸钴纳米粒子修饰的玻碳电极具有良好的稳定性和可逆的循环伏安行为，其电化学特征受溶液中配对阳离子种类和支持电解质浓度的影响。作为电极表面的媒介体，该薄膜对多巴胺的氧化还原具有电催化作用。

Molecule‐Based Cobalt Hexacyanoferrate Nanoparticle: Synthesis,Characterization, and Its Electrochemical Properties

Cobalt hexacyanoferrate (CoHCF) nanoparticles, with an average size of less than 50 nm for individual crystallite, were synthesized by simply mixing appropriate reactants in the absence of surfactant or template. Elemental analysis provided a stoichiometric formula, K_0.2Co_1.4Fe(CN)₆]·xH₂O for this compound. The involvement of both ferromagnetic Co_1.5^IIFe^III(CN)₆] and antiferromagnetic KCo^IIIFe^II(CN)₆] species in the CoHCF complex was effectively proved by Fourier transform infrared spectroscopy, so was the existence of certain amounts of interstitial water molecules. A glassy carbon electrode modified with these CoHCF nanoparticles had high stable and reversible cyclic voltammetric responses even at high scan rates and its electrochemical properties were affected by the nature of counter cations and the concentration of supporting electrolyte. The prepared nanoparticle films, as a mediator on electrode surface, exhibited considerable electrocatalytic activity toward the oxidation of dopamine.