Abstract
Quantum dots (QDs) are semiconducting inorganic nanoparticles, tiny molecules of 2–10 nm sizes to strength the quantum confinements of electrons. The QDs are good enough to emit light onto electrons for exciting and returning to the ground state. Here, CdSe/ZnS core/shell QDs have been prepared and applied for electrochemical sensor development in this approach. Flat glassy carbon electrode (GCE) was coated with CdSe/ZnS QDs as very thin uniform layer to result of the selective and efficient sensor of 3-CP (3-chlorophenol). The significant analytical parameters were calculated from the calibration plot such as sensitivity (3.6392 µA µM−1 cm−2) and detection limit (26.09 ± 1.30 pM) with CdSe/ZnS/GCE sensor probe by electrochemical approach. The calibration curve was fitted with the regression co-efficient r2 = 0.9906 in the range of 0.1 nM ∼ 0.1 mM concentration, which denoted as linear dynamic range (LDR). Besides these, it was performed the reproducibility in short response time and successfully validated the fabricated sensor for 3-CP in the real environmental and extracted samples. It is introduced as a noble route to detect the environmental phenolic contaminants using CdSe/ZnS QDs modified sensor by electrochemical method for the safety of healthcare and environmental fields at broad scales.
Highlights
The above methods of this proposed detection are with narrow linear dynamic ranges as well as the higher detection limits, they are expensive due to maintain sophisticated equipment, time consuming tests and needs skilled operators
The proposed electrochemical sensor was attached with a Keithly electrometer, where CdSe/ZnS Quantum dots (QDs)/binder/glassy carbon electrode (GCE) was performed as working and Pt-wire as counter electrode respectively. 3-CP solution were prepared and used as target analytes
The proposed application of 3-CP electrochemical sensor based on CdSe/ZnS QD/binder/GCE was to detect of 3-CP by electrochemical approach in phosphate buffer solution
Summary
Semiconductor quantum dots (QDs), in particular those of cadmium chalcogenides (CdS, CdSe, CdTe), have received steadily growing attention due to their high potential for various applications, such as sensing[1,2], biological labeling[3,4,5,6,7,8,9,10,11,12], light-emitting devices (LED)[13,14,15,16,17], lasers[18,19], and solar cells[20,21,22]. To the best of our knowledge, this is the first approach for the development of selective and efficient chemical sensor with CdSe/ZnS core/shell type QDs by using electrochemical method. Analytical performances of the proposed electrochemical sensor such as sensing capability, response time, detection limit and linear dynamic range were calculated very carefully.
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