Photoelectroanalytical Sensor Based on TiO₂ Nanoparticles/Copper Tetrasulfonated Phthalocyanine for Detection of Dopamine Exploiting Light Emitting Diode Irradiation

Abstract

In this manuscript, a novel photoelectroanalytical sensor for detection of dopamine based on anatase TiO2 nanoparticles sensitized with copper tetrasulfonated phthalocyanine (CuTsPc/TiO2) was developed. The CuTsPc/TiO2 photoelectroanalytical sensor shows high anodic photocurrent under visible light emitting diode irradiation in comparison to pure anatase TiO2 nanoparticles. The CuTsPc/TiO2 composite shows a photocurrent about 2.5‐fold higher than those of pure TiO2 nanoparticles or CuTsPc modified electrode. The CuTsPc/TiO2 composite shows a low charge transfer resistance in comparison to its individual components as well as the impedance circle radius decreases significantly under UV light illumination. Under optimized conditions, the photoelectroanalytical sensor shows a linear response range from 4 up to 810 µmol L−1 with a sensitivity of 3.0 nA L µmol−1 and limit of detection of 0.5 µmol L−1 for the detection of dopamine. The photoelectrochemical sensor shows high photocurrent to dopamine in comparison to foreign species such as ascorbic acid, uric acid, glucose, K+, Na+, and Cl−.

Effect of TiO2 on Altering Direction of Interfacial Charge Transfer in a TiO2‐Ag‐MPY‐FePc System by SERS

“…To elucidate the reasons for the considerable difference in the relative intensity of MPY, energy level schematics of the three kinds of systems for the CT processes were proposed in Figure . The energy level structures of the related components in the systems were in accordance with those in the previous reports . In the Ag‐MPY system (Figure A), the electron can be excited from the Fermi level of the Ag NPs and then transfer to the lowest unoccupied molecular orbital (LUMO) level of MPY under the 633 nm excitation with the energy of 1.96 eV.…”

Visible Light Photoelectrochemical Sensor for Dopamine: Determination Using Iron Vanadate Modified Electrode

“…The authors achieved a linear response in the 0.05 to 20 µmol L −1 dopamine concentration range, with 16.7 µmol L −1 as LOD. In another manuscript, dopamine detection was performed on anatase TiO 2 nanoparticles sensitized with copper tetrasulfonated phthalocyanine (CuTsPc/TiO 2 ) [ 56 ]. The photoelectrochemical measurements showed a linear response range between 4 and 810 µmol L −1 with a limit of detection of 0.5 µmol L −1 .…”

Au Nanoparticles-Decorated BiOI Nanosheet Arrays for Cathodic Photoelectrochemical Dopamine Sensors

“…DA is an essential neurotransmitter, and abnormal levels of DA in biological fluids are associated with many serious diseases. − Thus, the quantitative detection of DA in biological fluids is necessary. The PEC sensors for DA detection are mostly based on the mechanism of photogenerated hole oxidation of DA − or photoelectron reduction of polydopamine (PDA) on the photoanode. − It is important to explore novel PEC detection mechanisms of DA for advancing the design and application of PEC sensors. Herein, a visible light-driven cathodic PEC sensing platform based on BiOI nanosheet arrays (NSAs) integrated with gold NPs (AuNPs) via a two-step electrodeposition method is proposed.…”