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Facile synthesis of up‐conversion Cit‐NaYF 4 :Yb,Tm @phenol‐formaldehyde resin@Ag composites for the sensitive detection of S 2 −
Author(s) -
Sun Xiangfei,
Yang Ping,
Wang Shaohua,
Feng Lina,
Shi Jianjun
Publication year - 2021
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.49710
Subject(s) - formaldehyde , phenol , nanoparticle , materials science , citric acid , detection limit , nuclear chemistry , fluorescence , composite material , chemistry , nanotechnology , organic chemistry , chromatography , physics , quantum mechanics
In this work, we synthesized the core‐shell structure citric acid‐modified up‐conversion luminescent nanoparticles (Cit‐NaYF 4 :Yb,Tm) (denoted as UC)@ polymer of phenol‐formaldehyde resin (PFR) particles. Ag nanoparticles were successfully loaded onto the PFR's shell by direct reduction of AgNO 3 in situ with rich hydroxyl groups in PFR and a new application of the UC@PFR@Ag composites for detection of S 2− was investigated. A good linear relationship between the fluorescence intensity of as‐synthesis of UC@PFR@Ag composites and the concentration of S 2− could be found within the range of 2–100 nM ( R 2 = 0.9929) with a limit of detection of 0.67 nM. The values of S 2− content in actual water samples obtained with the proposed method are much closer to unity as compared to the corresponding values obtained with the UV method.