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Graphene Oxide‐Hyperbranched Polyethyleneimine Fabricated and Stabilized AuNPs Nanocomposites for Colorimetric Detection of Silver Ions Based on a Non‐Aggregation Mechanism
Author(s) -
Bian Jie,
Li Yuxi,
Zhu Chenxue,
Liu Xunyong,
Liu Yi
Publication year - 2021
Publication title -
chemnanomat
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.947
H-Index - 32
ISSN - 2199-692X
DOI - 10.1002/cnma.202000593
Subject(s) - polyethylenimine , zeta potential , oxide , graphene , materials science , colorimetry , colloidal gold , reducing agent , nanocomposite , metal ions in aqueous solution , fourier transform infrared spectroscopy , nanomaterials , x ray photoelectron spectroscopy , chemical engineering , nuclear chemistry , metal , nanoparticle , nanotechnology , chemistry , chromatography , engineering , metallurgy , transfection , biochemistry , gene
Highly water‐soluble GO‐HPEI was prepared by modifying graphene oxide (GO) with hyperbranched polyethylenimine (HPEI) containing a large number of amines to solve the problem of poor water‐solubility of GO. Using GO‐HPEI as reducing agent and stabilizer, Au nanoparticles (AuNPs) based colorimetric probe (GO‐HPEI/AuNPs) with thermal stability up to 130 °C and high salt resistance was prepared in situ. The morphology and structure of GO‐HPEI/AuNPs were characterized by XPS, FTIR, TEM, DLS and Zeta potential. The GO‐HPEI/AuNPs can detect silver ions (Ag + ) through the formation of non‐aggregated and stabilized Au−Ag core‐shell nanoparticles. The unusual sensing mechanism endowed this sensor with unique color variation and high selectivity. The GO‐HPEI/AuNPs sensor exhibited an obvious color change from red to ochre yellow and high sensitivity (LOD=54.9 nM) with a good linear relationship in the range of 0–65.7 μM (R 2 =0.9903). Furthermore, this colorimetric sensor was successfully applied to detect Ag + in real water samples. Therefore, the GO‐HPEI/AuNPs sensor based on the formation of new nanomaterials has great potential for detecting Ag + and analytical applications.