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首页> 外文期刊>Applied Nanoscience >Efficient “turn-on” nanosensor by dual emission-quenching mechanism of functionalized Se doped ZnO nanorods for mercury (II) detection
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Efficient “turn-on” nanosensor by dual emission-quenching mechanism of functionalized Se doped ZnO nanorods for mercury (II) detection

机译：通过功能化Se掺杂的ZnO纳米棒的双重发射猝灭机理，用于汞（II）检测的高效“开启”纳米传感器

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Mercury, a highly toxic contaminant is a detrimental environmental pollutant that causes severe health problems in human beings and developing an economical, rapid, and efficient technique for determination of Hg2+ ions at low concentrations remains a challenge. Herein, we report the preparation and application of orange-red luminescent Se doped ZnO nanorods (NRs), by a mechanothermal method, that was coated with 3-mercaptopropionic acid (3MPA), a chelating ligand to detect mercury ions because of strong affinity of –SH functionality. The formation of nanosensor with MPA was confirmed by the presence of an S2p3/2 peak at 162.7?eV, an absence of –SH stretching bond at 2566?cm?1 and reduction of crystalline nature from XPS, FTIR and XRD techniques, respectively. In the presence of Hg2+ ions, 3MPA–Se doped ZnO nanoprobe show efficient turn-on (restoration) photoluminescence over dual emission-quenching phenomenon owing to increased zeta potential (??17.06?mV) and anti-aggregation effect induced by rapidly separated 3MPA surface ligands bound to selenium doped ZnO within 30?s. Additionally, a linear fit of photoluminescence (PL) spectrum for various concentrations of Hg2+ ions provide compelling evidence for emission ( R 2?=?0.990) over quenching ( R 2?=?0.888) mechanism which is in support of our proposed mechanism. Therefore, this “turn-on” MPA-coated Se doped ZnO nanosensor is employed for selective detection of Hg2+ ions with the lowest limit of concentration to 1?pM. These results demonstrate that our direct, rapid and effective approach for mercury detection using this nanoprobe will offer a great potential for monitoring Hg2+ ions from the environment and in healthcare applications.
机译：汞是一种剧毒污染物，是有害的环境污染物，会导致人类严重的健康问题，因此开发一种经济，快速，高效的技术来测定低浓度的Hg2 +离子仍然是一项挑战。本文中，我们报告了通过机械热法制备橙红色发光的Se掺杂的ZnO纳米棒（NRs）的制备和应用，该表面涂有螯合配体3-巯基丙酸（3MPA），可检测汞离子，因为–SH功能。分别通过XPS，FTIR和XRD技术在162.7？eV处存在S2p3 / 2峰，在2566？cm？1处不存在–SH伸缩键以及结晶性降低，证实了MPA纳米传感器的形成。在存在Hg2 +离子的情况下，掺杂3MPA-Se的ZnO纳米探针由于zeta电位增加（？17.06？mV）和快速分离的3MPA诱导的抗聚集效应，在双发射猝灭现象下显示出有效的开启（恢复）光致发光。表面配体在30？s内与掺杂硒的ZnO结合。另外，对于各种浓度的Hg2 +离子，光致发光（PL）光谱的线性拟合为猝灭（R2α=？0.888）机理的发射（R2α=？0.990）提供了令人信服的证据，这支持了我们提出的机理。因此，这种“开启”的MPA涂层的Se掺杂的ZnO纳米传感器被用于选择性检测Hg2 +离子，其最低浓度限制为1？pM。这些结果表明，我们使用这种纳米探针的直接，快速和有效的汞检测方法将为监测环境和医疗保健应用中的Hg2 +离子提供巨大潜力。

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