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首页> 外文期刊>Advanced Functional Materials >Heme Cofactor-Resembling Fe-N Single Site Embedded Graphene as Nanozymes to Selectively Detect H_2O_2 with High Sensitivity
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Heme Cofactor-Resembling Fe-N Single Site Embedded Graphene as Nanozymes to Selectively Detect H_2O_2 with High Sensitivity

机译：血红素辅因子修饰Fe-N单点嵌入石墨烯作为纳米酶，可选择性检测高灵敏度的H_2O_2

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摘要

Over the past decade, the catalytic activity of nanozymes has been greatly enhanced, but their selectivity is still low and considered a critical issue to overcome. Herein, Fe-N-4 single site embedded graphene (Fe-N-rGO), which resembles the heme cofactor present in natural horseradish peroxidase, shows a marked enhancement in peroxidase-like catalytic efficiency of up to approximate to 700-fold higher than that of undoped rGO as well as excellent selectivity toward target H2O2 without any oxidizing activity. Importantly, when Fe or N is doped alone or when Fe is replaced with another transition metal in the Fe-N-4 site, the activity is negligibly enhanced, showing that mimicking the essential cofactor structure of natural enzyme might be essential to design the catalytic features of nanozymes. Density functional theory results for the change in Gibbs free energy during the peroxide decomposition reaction explain the high catalytic activity of Fe-N-rGO. Based on the high and selective peroxidase-like activity of Fe-N-rGO, trace amounts of H2O2 produced from the enzymatic reactions from acetylcholine and cancerous cells are successfully quantified with high sensitivity and selectivity. This work is expected to encourage studies on the rational design of nanozymes pursuing the active site structure of natural enzymes.
机译：在过去的十年中，纳米酶的催化活性已经大大提高，但是它们的选择性仍然很低，被认为是需要克服的关键问题。在此，类似于天然辣根过氧化物酶中存在的血红素辅因子的Fe-N-4单点嵌入石墨烯（Fe-N-rGO）表现出明显的过氧化物酶样催化效率增强，其最高可达约700倍。具有非掺杂rGO的选择性以及对目标H2O2的优异选择性，而无任何氧化活性。重要的是，当单独掺杂Fe或N或当Fe-N-4位点中的Fe被另一种过渡金属替代时，其活性可以忽略不计地提高，这表明模仿天然酶的必需辅因子结构可能对设计催化活性至关重要。纳米酶的特点。在过氧化物分解反应期间吉布斯自由能变化的密度泛函理论结果解释了Fe-N-rGO的高催化活性。基于Fe-N-rGO的高选择性过氧化物酶样活性，可以高灵敏度和高选择性成功地定量分析乙酰胆碱和癌细胞的酶促反应产生的痕量H2O2。预期这项工作将鼓励对追求天然酶活性位点结构的纳米酶进行合理设计的研究。

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