Fluorescence spectroelectrochemical sensor for 1-hydroxypyrene.

Area of Science:

• Analytical Chemistry
• Electrochemistry
• Spectroscopy

Background:

• Organic compounds can be detected using electrochemical and fluorescence methods.
• Polycyclic aromatic hydrocarbons (PAHs) like 1-hydroxypyrene (1-PyOH) are important environmental and biological analytes.
• Spectroelectrochemical techniques combine electrochemical control with spectroscopic detection.

Purpose of the Study:

• To develop a sensitive spectroelectrochemical sensor for 1-hydroxypyrene (1-PyOH).
• To investigate the electron transfer-chemical reaction-electron transfer (ECE) mechanism of 1-PyOH oxidation.
• To utilize fluorescence detection of electrochemically generated species.

Main Methods:

• Utilized an optically transparent thin-layer electrode to study 1-PyOH.
• Employed a tin-doped indium oxide electrode coated with Nafion for analyte preconcentration.
• Integrated attenuated total reflection (ATR) spectroscopy for fluorescence excitation.
• Applied electrochemical modulation for detection.

Main Results:

• 1-PyOH oxidation via ECE mechanism produces a fluorescent dihydroxypyrene species.
• The sensor demonstrated a linear calibration curve from 5 × 10⁻⁹ to 1 × 10⁻⁶ M.
• Achieved a low detection limit of 1 × 10⁻⁹ M for 1-PyOH.

Conclusions:

• A novel spectroelectrochemical sensor for 1-PyOH detection was successfully developed.
• The sensor leverages the ECE mechanism and fluorescence of the oxidation product for sensitive detection.
• This approach offers a promising method for the trace analysis of PAHs.