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چکیده
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In this research, first, the colloidal solution of ZnSe:Cu(1.5%) quantum dots with 1.5% copper dopant were synthesized using an aqueous-photochemical approach and grown by microwave irradiation for 6 min. Then, some of the solution was stored as a reference and the remaining amount was covered by ZnS under UV light to synthesize the nanorods. In order to make gas sensors, first, thin layers of titanium were prepared by sputtering method, and then, comb-like patterns (with the electrode distance of about 30 μm) was created on them using the lithography method. Then, the colloidal solution containing the synthesized quantum dots was drop-casted between the electrodes of each device and they were used as conductors sensitive to ethanol gas flow. Results showed that the passing current from ZnSe:Cu(1.5%) in the absence of gas flow quantum dots is relatively low and the sensor based on it has not the desired response. However, after the ZnS coating and so the formation of the core/shell structure of nanorods beside the spherical nanoparticles, along with the improving of conductivity in the absence of gas flow, the gas response increases dramatically. According to the results, ZnSe:Cu(1.5%)@ZnS core/shell nanorods are promising nanomaterials in the field of ethanol gas sensors.
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