Citation: CHEN Xin-Yue, HA Wei, SHI Yan-Ping. A Sensitive Colorimetric Detection Method for Aluminium Ion (Ⅲ) Based on Asymmetrically PEGylated Gold Nanoparticles[J]. Chinese Journal of Analytical Chemistry, ;2019, 47(5): 709-718. doi: 10.19756/j.issn.0253-3820.181698 shu

A Sensitive Colorimetric Detection Method for Aluminium Ion (Ⅲ) Based on Asymmetrically PEGylated Gold Nanoparticles

CHEN Xin-Yue ^1,2, ,
HA Wei ¹ ,
SHI Yan-Ping ¹

1.
CAS Key Laboratory of Chemistry of Northwestern Plant Resources and Key Laboratory for Natural Medicine of Gansu Province, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China;
2.
University of Chinese Academy of Sciences, Beijing 100039, China

Received Date: 2 November 2018
Revised Date: 1 February 2019

Fund Project: This work was supported by the National Natural Science Foundation of China (Nos. 21405164, 21575150, 21775153) and the Youth Innovation Promotion Association of the Chinese Academy of Sciences (No. 2017457).

An effective, accurate and stable colorimetric detection method for aluminium ion (Al³⁺) through chelation based on the large-sized gold nanoparticles (AuNPs) asymmetrically modified with polyethylene glycol (PEG) and citrate was developed. Initially, citrate-stabilized AuNPs with different sizes (13 nm, 26 nm, 38 nm) were synthesized to explore the correlation between particle dimensions and detection sensitivity. The detection limit of 38 nm AuNPs was as low as 1 μmol/L by visual observation which demonstrated that sensitivity couold be improved by increasing the particle size. In the following, citrate-stabilized AuNPs were modified on the glass slide, through which some binding sites on the surface of AuNPs were concealed. The stabilizing agent PEG was introduced onto the exposed surface of AuNPs and characterized by laser dynamic scattering instrument (DLS), field-Emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM) and energy dispersive spectrum (EDS). The aggregation behavior was further adjusted in an oriented and controllable manner to form oligomers which could remain stable in aqueous solution for a long time. Such an asymmetrical modification could significantly improve the dynamic detection range (1 μmol/L-100 mmol/L), and a linear correction curve (y=0.06485x + 0.60851, R²=0.99) was obtained. Nine common metal ions were also investigated, which exhibited the good selectivity of detection system to Al³⁺. PEG and citrate modified AuNPs could be applied in the detection of spiked tap water sample.
- Gold nanoparticles,
- Asymmetrical modification,
- Oriented aggregation,
- Aluminium ion,
- Colorimetric detection
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