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A new formaldehyde sensor from silver nanoclusters modified Tollens' reagent
Kanokwan Chaiendoo1, Sawarin Sooksin1, Sirinan Kulchat1
1Materials Chemistry Research Center, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand.
Food Chemistry
|March 25, 2018
Summary
A new colorimetric assay uses silver nanoclusters to detect formaldehyde (FA) with high selectivity. This method offers a visual detection of FA, crucial for environmental and safety monitoring.
Area of Science:
- Nanomaterials Science
- Analytical Chemistry
- Chemical Sensing
Background:
- Formaldehyde (FA) is a common volatile organic compound with significant health and environmental implications.
- Accurate and selective detection of formaldehyde is crucial for various applications, including environmental monitoring and industrial safety.
Purpose of the Study:
- To develop a selective and sensitive colorimetric assay for formaldehyde detection.
- To utilize silver nanoclusters (AgNCs) templated by polymethacrylic acid (PMAA) for a novel chemodosimeter.
Main Methods:
- Fabrication of a chemodosimeter (AgNCs@Tollens) using silver nanoclusters and Tollens' reagent.
- Detection principle based on the size-dependent optical properties (Localized Surface Plasmon Resonance - LSPR) of silver nanoparticles.
- Colorimetric analysis of formaldehyde concentration via changes in absorbance at 430 nm.
Main Results:
- The assay demonstrated a linear response of absorbance intensity with formaldehyde concentration in the working range of 30-50 µM.
- A low limit of detection (LOD) of 27.99 µM was achieved.
- The method exhibited excellent selectivity for formaldehyde over other aldehyde compounds, with visible color changes observable by the naked eye.
Conclusions:
- The proposed silver nanocluster-based colorimetric assay provides a simple, selective, and sensitive method for formaldehyde detection.
- The visual detection capability and high selectivity make this assay suitable for practical applications in formaldehyde monitoring.
