Theresults of carbon-doped zinc oxide nanoparticles synthesized by CO2 microwave plasma at atmospheric pressure are presented.\nThe2.45-GHz microwave plasma torch and feeder for injecting Zn granules are used in the synthesis of zinc oxide nanoparticles.The\nZn granules (13.5 g/min) were introduced into the microwave plasma by CO2 (5 l/min) swirl gas. The microwave power delivered\nto the CO2 microwave plasma was 1 kW. The synthesis of carbon-doped zinc oxide nanoparticles was carried out in accordance\nwith CO2 +Zn ? carbon-doped ZnO + CO. The synthesized carbon-doped zinc oxide nanoparticles have a high purity hexagonal\nphase. The absorption edge of carbon-doped zinc oxide nanoparticles exhibited a red shift froma high-energy wavelength to lower\nin the UV-visible spectrum, due to band gap narrowing. A UV-NIR spectrometer, X-ray diffraction, emission scanning electronmicroscopy,\nenergy dispersive X-ray microanalysis, Fourier transforminfrared spectroscopy, and aUV-Vis-NIR spectrophotometer\nwere used for the characterization of the as-produced products.
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