摘要
The aim of this research was to investigate the luminescent behavior of ultra-small Eu3+-activated phosphate and vanadate nanoparticles in the presence of pesticides.Nanoparticles have an average diameter of approximately 2 nm with a narrow size distribution.The monazite crystal structure of phosphate-based particles(space group P121/n1)and single tetragonal zircon-type structure of vanadate-based particles(space group of I41/amd)have been confirmed using X-ray diffraction measurements.All synthesized Eu3+-activated colloidal nanoparticles show sharp emission peaks in the red spectral region.Photoluminescence measurements revealed emission quenching upon addition of millimolar concentrations of following pesticides:4-Chloro-2-methyl-phenoxyacetic acid(MCPA),2,4-Dichlorophenoxyacetic acid(2,4-D)and N-(phosphonomethyl)glycine(Glyphosate).In both phosphate and vanadate-based colloidal nanoparticles luminescence quenching is more evident in the presence of 2,4-D pesticide with the lowest limit of detection(0.7μM)obtained for phosphate-based nanoparticles.
The aim of this research was to investigate the luminescent behavior of ultra-small Eu3+-activated phosphate and vanadate nanoparticles in the presence of pesticides. Nanoparticles have an average diameter of approximately 2 nm with a narrow size distribution. The monazite crystal structure of phosphate-based particles（space group P121/n1） and single tetragonal zircon-type structure of vanadate-based particles（space group of I41/amd） have been confirmed using X-ray diffraction measurements. All synthesized Eu3+-activated colloidal nanoparticles show sharp emission peaks in the red spectral region. Photoluminescence measurements revealed emission quenching upon addition of millimolar concentrations of following pesticides: 4-Chloro-2-methyl-phenoxyacetic acid（MCPA）, 2,4-Dichlorophenoxyacetic acid（2,4-D） and N-（phosphonomethyl）glycine（Glyphosate）. In both phosphate and vanadate-based colloidal nanoparticles luminescence quenching is more evident in the presence of 2,4-D pesticide with the lowest limit of detection（0.7 μM） obtained for phosphate-based nanoparticles.
基金
support from the National Recruitment Program of High-end Foreign Experts(Grant No.GDT20185200479)offered by the Chongqing University of Posts and Telecommunications(CQUPT),China
financial support of the Ministry of Education,Science and Technological Development of the Republic of Serbia(Nos.45020 and 172056).
