Visible-light-driven photoelectrochemical determination of Cu2+ based on CdS sensitized hydrogenated TiO2 nanorod arrays
Visible-light-driven photoelectrochemical determination of Cu2+ based on CdS sensitized hydrogenated TiO2 nanorod arrays
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基于CdS敏化氢化TiO2纳米棒阵列的可见光驱动光电化学测定Cu2
DOI：
10.1016/j.snb.2018.05.056
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发表时间：
2018-10
期刊：
影响因子：
--
通讯作者：
Yueping Fang
中科院分区：
文献类型：
--
作者：
Yueping Fang
制备了CdS敏化的氢化TiO 2纳米棒阵列（CdS@HTNRs）薄膜，用于可见光驱动的Cu 2+光电化学（PEC）传感。这种灵敏的测定是基于所制备的CdS@HTNRs具有极高的光电转换活性，即所制备的CdS@HTNRs电极的光电流密度可高达10.1 mA cm-2，是纯HTNRs膜的33.7倍。将CdS@HTNRs电极浸入Cu 2+溶液中后，观察到剧烈的光电流猝灭。分析原理是基于光电流的显著猝灭，即在光照下在电极表面形成CuS和随后的CuxS（x= 1，2），分别减少光的吸收和促进电子-空穴复合。由于所制备的CdS@HTNRs具有很大的光电流密度和CdS与Cu ~（2+）之间化学识别反应的高选择性，CuxS的光电流猝灭被认为是检测Cu ~（2+）离子的灵敏和选择性。通过控制识别反应时间为7 min，线性检测范围为0.8 nM ~ 82.0 μM，检测限为0.3 nM。该传感器还成功地应用于自来水、湖水、尿液等真实的样品中Cu ~（2+）的检测。
A CdS sensitized hydrogenated TiO2nanorod arrays (CdS@HTNRs) film was developed for the selective visible-light-driven photoelectrochemical (PEC) sensing of Cu2+ion. The sensitive determination was based on extremely high PEC activity of the as-prepared CdS@HTNRs, i.e, the photocurrent density of the as-prepared CdS@HTNRs electrode could reach up to 10.1 mA cm−2, which was 33.7 times higher than that of the pure HTNRs film. Dramatic photocurrent quenching was observed upon immersion of the CdS@HTNRs electrode into Cu2+solution. The analytical principle is based on significant quenching of photocurrent, i.e, the formation of CuS and subsequent CuxS (x= 1, 2) produced on the electrode surface under illumination reduces the absorption of light and boosts the electron-hole recombination, respectively. Due to the large photocurrent density of the as-prepared CdS@HTNRs and the high selectivity of chemical recognition reaction between CdS and Cu2+, the photocurrent quenching of CuxS, is proposed to be sensitive and selective in detecting Cu2+ion. The linear detection range could be 0.8 nM to 82.0 μM with the detection limit of 0.3 nM via controlling recognition reaction time to be 7 min. The sensor was also successfully applied in the detecting Cu2+ion in real samples such as tap water, lake water and urine.
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