PdCu alloy nanosheets-constructed 3D flowers: New highly sensitive materials for H2S detection
PdCu alloy nanosheets-constructed 3D flowers: New highly sensitive materials for H2S detection
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PdCu合金纳米片构建的3D花：用于H2S检测的新型高灵敏材料
DOI：
10.1016/j.snb.2019.03.101
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发表时间：
2019-06-15
影响因子：
8.4
通讯作者：
Du, Yukou
中科院分区：
文献类型：
--
作者：
Shang, Hongyuan;Xu, Hui;Du, Yukou
硫化氢(H_2S)可以在哺乳动物体内直接产生，被认为是第三种气体递质，与生理和病理过程密切相关。然而，具体的作用机制尚不清楚，主要是因为缺乏可靠的传感器来准确和定量地检测生物样品中的它的浓度。在这里，我们首次研制了一种基于中性溶液(pH 7.4)中氧化铜(CuO和Cu2O)与硫化氢(包括硫化氢和HS-)的化学反应来检测硫化氢的电化学传感器。有趣的是，当Na2S存在时，铜及其氧化物可以转化为Cu2S和CuS，导致Cu2S-CuS的氧化峰电流随着Na2S浓度的增加而增加，这直接证明了Cu2S是检测硫化氢的优良传感器。更重要的是，Cu2S-CuS的氧化峰电流与Na2S浓度在0.4~400µM范围内呈良好的线性关系，检测下限为0.2µM，具有较好的选择性。开发的策略可能会对进一步了解生物硫化氢在生物系统中所起的作用具有巨大的潜力。
Hydrogen sulfide (H2S) could be directly produced in mammals and recognized as a third gasotransmitter, which are closely associated with physiological and pathological processes. However, the detailed mechanism remains unclear, mainly due to a lack of robust sensors to accurately and quantitatively detect its concentrations in biological samples. Herein, for the first time, we develop a new electrochemical sensor for the detection of H2S based on the chemical reaction between copper oxide (CuO and Cu2O) and hydrogen sulfide (including H2S and HS-) at a neutral solution (pH 7.4). Interestingly, when Na2S exists, copper and its oxide can be converted into Cu2S and CuS, resulting in an increase in the oxidation peak current of Cu2S-CuS with the increase of Na2S concentration, which is a direct evidence confirming the excellent sensor for the H2S detection. More importantly, the linear relationship between the oxidation peak currents of Cu2S-CuS and Na2S concentration is observed from 0.4 mu M to 400 mu M with a low detection limit of 0.2 mu M, and satisfying selectivity. The developed strategy may have a great potential for further understanding the roles that biological H2S plays in biological systems.