Department of Chemistry, University of North Bengal, Raja Rammohunpur, Darjeeling, West Bengal 734013, India.
Langmuir. 2021 May 11;37(18):5506-5512. doi: 10.1021/acs.langmuir.1c00194. Epub 2021 Apr 30.
Ratiometric and visual sensing of phosphate by using a white light emitting quantum dot complex (WLE QDC) is reported herein. The WLE QDC comprised of Mn-doped ZnS quantum dot (with λ = 585 nm) and surface zinc quinolate (ZnQS) complex (with λ= 480 nm). The limit of detection was estimated to be of 5.9 nM in the linear range of 16.6-82.6 nM. This was accomplished by monitoring the variations in the photoluminescence color, intensity ratio (/), chromaticity and hue of the WLE QDC in the presence of phosphate. The high selectivity and sensitivity of WLE QDC toward phosphate was observed. The chemical interaction of ZnQS (present in WLE QDC) with phosphate might have led to the observed specificity in photoluminescence changes. The presented WLE QDC was successfully employed for the quantification of phosphate in samples prepared using environmental water and commercial fertilizer.
本文报道了一种利用白光发射量子点复合物（WLE QDC）进行磷酸盐的比色和可视化传感的方法。该 WLE QDC 由 Mn 掺杂的 ZnS 量子点（λ=585nm）和表面锌喹啉酸盐（ZnQS）复合物（λ=480nm）组成。在 16.6-82.6 nM 的线性范围内，检测限估计为 5.9 nM。这是通过监测在存在磷酸盐的情况下，WLE QDC 的光致发光颜色、强度比（I/I0）、色度和色调的变化来实现的。WLE QDC 对磷酸盐具有高选择性和灵敏度。ZnQS（存在于 WLE QDC 中）与磷酸盐的化学相互作用可能导致了观察到的光致发光变化的特异性。所提出的 WLE QDC 成功地用于环境水样和商业肥料制备样品中磷酸盐的定量。
