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首页> 外文期刊>Advanced Functional Materials >Gold-cluster sensors formed electrochemically at boron-doped-diamond electrodes: Detection of dopamine in the presence of ascorbic acid and thiols
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Gold-cluster sensors formed electrochemically at boron-doped-diamond electrodes: Detection of dopamine in the presence of ascorbic acid and thiols

机译：在掺杂硼的金刚石电极上电化学形成的金簇传感器：在抗坏血酸和硫醇的存在下检测多巴胺

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摘要

Gold clusters have been electrodeposited on a boron-doped diamond (131313) electrode by scanning the potential from 0.7 V to 0.0 V (vs. 3 M KCl-Ag/AgCl reference) in a solution of 0.5 mM KAuCl4 and 1.0 M KCl. The cluster-modified diamond (An/BDD) electrode has been used to investigate the oxidative properties of dopamine (DA) and ascorbate (AA). The modified diamond electrode shows a higher activity for DA oxidation than AA; the oxidation potential of DA shifted to a less-positive potential (0.11 V) than that of AA, which oxidized at 0.26 V, and DA possesses a much higher peak current than that of AA. The reversibility of the electrode reaction with DA is significantly improved at the Au/BDD electrode, which results in a large increase in the square-wave voltammetric peak current, with a detection limit of 0.1 mu M in the presence of a large excess of AA. The Au/BDD electrode shows excellent sensitivity and good selectivity for DA detection. A self-assembled monolayer (SAM) of mercaptoacetic acid on the Au clusters was used to provide an antifouling effect as the negative CO2- groups repulse negative ascorbate and attract positive dopamine in pH7.4 buffer. After pre-absorption, the SAM/Au/BDD electrode could detect 1.0 nM DA in a linear range from 10 nM to 10 mu M in the presence of 10(-4) M AA.
机译：通过在0.5 mM KAuCl4和1.0 M KCl的溶液中扫描0.7 V至0.0 V（相对于3 M KCl-Ag / AgCl参比）的电势，将金簇电沉积在掺硼金刚石（131313）电极上。团簇修饰金刚石（An / BDD）电极已用于研究多巴胺（DA）和抗坏血酸盐（AA）的氧化性能。改性的金刚石电极对DA的氧化活性高于AA。 DA的氧化电位转变为比AA更低的正电位（0.11 V），后者在0.26 V时被氧化，DA的峰值电流远高于AA的峰值电流。在Au / BDD电极上，电极与DA反应的可逆性得到显着改善，这导致方波伏安峰电流大大增加，在大量过量AA的存在下检测限为0.1μM 。 Au / BDD电极对DA检测显示出极好的灵敏度和良好的选择性。 Au簇上巯基乙酸的自组装单层（SAM）用于提供防污效果，因为负的CO2-排斥负的抗坏血酸盐并在pH7.4缓冲液中吸引正多巴胺。预吸收后，在存在10（-4）M AA的情况下，SAM / Au / BDD电极可在10 nM至10μM的线性范围内检测到1.0 nM DA。

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