Selective and sensitive detection of copper(II) based on fluorescent zinc-doped AgInS2 quantum dots
Selective and sensitive detection of copper(II) based on fluorescent zinc-doped AgInS2 quantum dots
复制标题
基于荧光掺锌AgInS2量子点选择性灵敏检测铜(II)
DOI：
10.1016/j.jlumin.2018.04.046
复制
发表时间：
2018-09-01
影响因子：
3.6
通讯作者：
Qiu, Feng
中科院分区：
文献类型：
--
作者：
Liu, Yongfeng;Zhu, Tao;Qiu, Feng
对水溶液中有害重金属离子进行灵敏、选择性的快速检测具有重要意义。本研究采用热注射法制备了疏水锌掺杂AgInS2 （AIZS）量子点（QDs），并通过微乳液/溶剂蒸发技术将其通过十二烷基硫酸钠（SDS）转移到水分散状态。所制备的亲水量子点成功地应用于水中二价铜离子的检测。x射线光电子能谱（XPS）验证了亲水性AIZS量子点的光致发光（PL）被Cu2+离子猝灭，这可能是由于电子从量子点向Cu2+的有效转移所致。该探针相对标准偏差为2.1%，线性范围为0 ~ 340 μ M，检出限（LOD）低至27.3 nM。该传感系统不受其他阳离子的干扰，对Cu2+具有良好的选择性。基于qds的荧光传感器在饮用水和自然水资源中铜（II）浓度测定方面具有很大的实用潜力。
Sensitive and selective strategies for the rapid detection of hazardous heavy metal ions in aqueous solution are of great significance. In this study, hydrophobic zinc-doped AgInS2 (AIZS) quantum dots (QDs) are synthesized by hot-injection method, and then transferred into water-dispersible by sodium dodecyl sulfate (SDS) via miniemulsion/solvent evaporation technique. The as-prepared hydrophilic AIZS QDs are successfully applied for the detection of divalent copper ions in water. The photoluminescence (PL) of the hydrophilic AIZS QDs is quenched by Cu2+ ions, which could be contributed to effective electron transfer from QDs to Cu2+, as verified by corresponding X-ray photoelectron spectroscopy (XPS). The probe possesses low relative standard deviation of 2.1% and wide linear range from 0 to 340 mu M with a limit of detection (LOD) as low as 27.3 nM. What's more, the sensing system is not interfered by other cations, indicating its good selectivity toward Cu2+. The QDs-based fluorescent sensor possesses greatly practical potential to determine the concentration of copper(II) in drinking water and natural water resources.