Fluorescent Copper Nanomaterials for Sensing NO₂ ^- and Temperature

Area of Science:

• Materials Science
• Nanotechnology
• Analytical Chemistry

Background:

• Development of novel fluorescent nanomaterials is crucial for sensitive chemical sensing.
• Copper nanomaterials offer unique optical properties for various applications.
• Selective detection of nitrite ions remains a significant analytical challenge.

Purpose of the Study:

• To synthesize highly fluorescent copper nanomaterials using ascorbic acid.
• To investigate the potential of these nanomaterials for selective nitrite ion detection.
• To explore the application of copper nanomaterials as nanothermometers.

Main Methods:

• Synthesis of copper nanomaterials with ascorbic acid as a ligand.
• Characterization of optical properties (excitation/emission wavelengths) and size.
• Evaluation of fluorescence quenching by nitrite ions for quantitative analysis.
• Assessment of fluorescence intensity correlation with temperature variations.

Main Results:

• Successfully synthesized highly fluorescent copper nanomaterials (5-6 nm) with excitation at 367 nm and emission at 420 nm.
• Demonstrated selective fluorescence quenching of copper nanomaterials by nitrite ions.
• Established a linear relationship (F = -32.94 c (NO2-) + 8,455, R²=0.9435) for nitrite detection.
• Observed a good correlation between fluorescence intensity and temperature (20-60°C).

Conclusions:

• The synthesized copper nanomaterials are effective for the selective detection of nitrite ions.
• The temperature-dependent fluorescence of copper nanomaterials suggests their utility in nanothermometry.
• These findings highlight the dual applicability of copper nanomaterials in sensing and temperature measurement.