Abstract
A stepwise electro-deposition approach was employed for the fabrication of composite of CdSe QD/Meso-Silica/rGO on a graphite electrode. Spectroscopic techniques like Diffuse Reflectance, ATR-FTIR, Raman, XRD, Photoluminescence, XPS, microscopic techniques such as SEM, AFM and voltammetric techniques have been carried out to establish the sensor characteristic. The presence of the CdSe quantum dots over the mesoporous silica particles along with the reduced graphene oxide provided greater surface area and enhanced electron transfer characteristics as was evident from the improved response in comparison to the unmodified electrode. The composite sensor was employed for studying the detection of phenolic antioxidants. Under the optimized experimental conditions, a detection range of 5.90–523.61 nM, 20.00–5221.72 nM and 23.00–4670.01 nM was observed for Chlorogenic acid (CGA), Gallic acid (GA) and Salicylic acid (SA) respectively at the corresponding working potential of 0.4 V, 0.3 V and 0.95 V. The sensor showed long term stability and the response of the sensor was retained for over a period of 30 days. The fabricated sensor was analyzed for real sample testing using coffee, tea, pharmaceutical formulations and urine samples.
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