Visible-light-driven polydopamine/CdS QDs hybrid materials with synergistic photocatalytic activity

Publication date: Available online 8 July 2019Source: Journal of Electroanalytical ChemistryAuthor(s): Majid Arvand, Sharareh Sayyar, Shiva HemmatiAbstractAn ultrasensitive photoelectrochemical (PEC) sensor for progesterone (P4) detection was synthesized based on electrochemical synthesis of CdS quantum dots (QDs) and then equipped chemically with polydopamine (PDA) to decorate PDA@CdS QDs/Ti structure on the Ti substrate. It was found that the sensitizers can significantly enhance the photocurrent and the as-prepared PDA@CdS QDs hybrid materials displayed much higher photocatalytic activity than the CdS QDs/Ti and PDA/Ti due to the synergic effect between CdS QDs and PDA. In detection process, P4 acts as an electron donor to scavenge the hole and inhibit the charge recombination. Therefore, the sensor can exhibit charge-transfer upon light illumination and achieve the detection purpose via the intensity of the photocurrent. The resulting photoelectrode showed good sensitivity and selectivity PEC response to P4. Under the optimized conditions, a good linear relationship was obtained between the increased photocurrent and logarithm of P4 concentrations ranging from 2.0 to 280 nM and the detection limit was down to 1.54 nM. Additionally, the sensor had relatively good stability and reproducibility, and it could be applied to the determination of P4 in human serum sample.Graphical abstract

Source: Journal of Electroanalytical Chemistry - July 9, 2019 Category: Chemistry Source Type: research