Polycyclic aromatic hydrocarbon detection by electrochemiluminescence generating Ag/TiO(2) nanotubes

Area of Science:

• Electrochemistry
• Materials Science
• Environmental Science

Background:

• Highly ordered titanium dioxide (TiO2) nanotubes possess unique photoelectrical properties.
• Their nanostructure facilitates efficient charge transport.
• Titanium dioxide nanotubes (TiO2 NTs) are explored for electrochemical applications.

Purpose of the Study:

• To develop a novel electrochemiluminescence (ECL) detection method for polycyclic aromatic hydrocarbons (PAHs).
• To utilize silver nanoparticle-modified TiO2 nanotubes (Ag/TiO2 NTs) as a working electrode for ECL detection.
• To establish a sensitive and selective method for detecting benzo(a)pyrene (BaP) and other PAHs.

Main Methods:

• Fabrication of Ag/TiO2 NT films for use as working electrodes.
• Electrochemical characterization of the Ag/TiO2 NT electrode.
• Optimization of ECL detection parameters using S2O8(2-) as a coreactant.
• Quantification of benzo(a)pyrene (BaP) via ECL signal changes.

Main Results:

• The Ag/TiO2 NT electrode demonstrated effective ECL detection of BaP.
• A low detection limit of 1.0 x 10(-12) M and a linear range of 3.0 x 10(-12) to 1.0 x 10(-9) M were achieved for BaP.
• The method showed minimal interference from compounds not oxidizable by excited TiO2, indicating selectivity for PAHs with more than four rings.

Conclusions:

• Ag/TiO2 NTs serve as a promising platform for highly sensitive ECL-based detection of PAHs.
• The developed method offers a significant advancement in the trace analysis of specific PAHs.
• This approach holds potential for environmental monitoring and chemical sensing applications.