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Updated: Jun 3, 2025

A Method for Selecting Structure-switching Aptamers Applied to a Colorimetric Gold Nanoparticle Assay

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Published on: February 28, 2015

An Aminobenzenethiol-Functionalized Gold Nanocolorimetric Sensor for Formaldehyde Detection.

Jing Xu¹, Liya Shen¹, Haining You¹

¹Guangxi Key Laboratory of Optical and Electronic Materials and Devices, College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, China.

Materials (Basel, Switzerland)

|January 8, 2025

Summary

Aminophenol-modified gold nanoparticles (ATP-AuNPs) offer a novel sensor for formaldehyde detection. The para-positioned configuration demonstrated optimal sensitivity and stability for detecting formaldehyde in various water samples.

Keywords:

aminothiophenol colorimetric sensor formaldehyde detection gold nanoparticles

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Last Updated: Jun 3, 2025

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Published on: March 7, 2018

Area of Science:

Nanomaterials Science
Analytical Chemistry
Environmental Science

Background:

Formaldehyde is a ubiquitous compound with significant implications across various aspects of life.
Accurate and sensitive detection methods for formaldehyde are crucial for environmental monitoring and safety.
Gold nanoparticles (AuNPs) modified with aminophenol derivatives (ATP-AuNPs) present a promising platform for chemical sensing applications.

Purpose of the Study:

To synthesize and characterize aminophenol-modified gold nanoparticles (ATP-AuNPs) with varying positional arrangements of functional groups.
To investigate the influence of functional group positioning on the stability and formaldehyde sensing capabilities of ATP-AuNPs.
To evaluate the performance of the optimized ATP-AuNP sensor for formaldehyde detection in real-world water samples.

Main Methods:

Synthesis of aminophenol-modified gold nanoparticles (ATP-AuNPs) with distinct hydroxyl and amino group configurations.
Characterization using transmission electron microscopy (TEM), ultraviolet-visible (UV-Vis) spectroscopy, and Fourier transform infrared (FTIR) spectroscopy.
Assessment of sensor stability and formaldehyde detection limits in ultrapure and natural water samples.

Main Results:

The positional arrangement of hydroxyl and amino groups significantly impacts the properties of ATP-AuNPs.
Optimal stability was observed when functional groups transitioned from para to neighboring positions.
The para-positioned ATP-AuNPs exhibited superior performance as a formaldehyde sensor.
The limit of detection (LOD) for formaldehyde was determined to be 1.03 mM in ultrapure water and 1.15 mM in Li River water.

Conclusions:

The study successfully developed a novel ATP-AuNP-based sensor for formaldehyde detection.
The para-configuration of functional groups on AuNPs is critical for enhanced sensor performance.
The developed sensor demonstrates practical applicability for formaldehyde determination in environmental water samples.