Fluorescent methylammonium lead halide perovskite quantum dots as a sensing material for the detection of polar organochlorine pesticide residues. Issue 20 (19th August 2020)

• Record Type: Journal Article
• Authors: Yang, Yayu; Han, Ailing; Hao, Sijia; Li, Xia; Luo, Xiaoyu; Fang, Guozhen; Liu, Jifeng; Wang, Shuo
• Is Part Of: Analyst. Volume 145:Issue 20(2020)
• Page Start: 6683
• Page End: 6690
• Publication Date: 2020-08-19
• Subjects: Chemistry, Analytic -- Periodicals; 543
• DOI: 10.1039/d0an01127d
• Languages: English
• ISSNs: 0003-2654

Abstract

Abstract : The doping of polar OCPs in MAPB-QDs induced the change in the crystal structure and blue-shift of fluorescence. Abstract : Methylammonium lead halide perovskite quantum dots (MAPB-QDs) have been widely used for photovoltaic devices due to their special electronic structures. In this work, MAPB-QDs were used for the first time to detect polar organochlorine pesticides (OCPs) based on the phenomenon that the fluorescence spectra of MAPB-QDs were blue-shifted in the presence of polar OCPs. Furthermore, 1 H NMR, FTIR, XPS and XRD were performed first to illustrate the sensing mechanism. In the presence of polar OCPs, the MAPB-QDs' capping ligands, oleic acid (OA) and oleylamine (OAm), were replaced with OCPs and then the chlorine element was adequately doped into QDs, resulting in the increase of the MAPB-QDs' bandgap. As result of the insufficient stability of MAPB-QDs in the presence of moisture, MAPB-QDs were mixed with PDMS and used as the colorimetric cards for fast detection of OCPs in real samples.