In this study, zinc oxide nanoparticles were synthesized by using an atmospheric-pressure plasma jet in NaOH-HNO 3 electrolytic system. Atmospheric-Pressure Plasma Jet was successfully used as the cathode and Znsheet was used as the anode. The characterization of zinc oxide was obtained by X-ray powder diffraction (XRD), Fourier transformation infra-red (FTIR) and transmission electron microscope (TEM). The results show that the morphology of zincoxide nanocrystals obtained by this technology is mainly dependent on the electrolytic media, current density and reaction temperature. The average grain size of ZnO nanoparticles is around 50.4 nm. These results encourage preparing these nanostructures for using in a great interest applications in solar cells, UV light emitting diodes, gassensors, etc. This technique is low cost, scalable and general and should allow a wide range of nanoparticle materials to be synthesized in the gas or liquid phase.
Graphene with high electronic transport, large surface-to-volume ratio and nanometer thickness is excellent for gas sensing applications. However, its sensitivity and recovery face serious limitations in practical considerations. In this study, graphene oxide (Go) sheets were synthesized and exposed to hydrogen (H2) plasma to reduced it into a reduced graphene oxide (rGo) in a controlled procedure. In this regard, Go sheets were irradiated with plasma at different times and their electrical properties were evaluated. The results showed that with increasing bombardment time from 2 to 8 min, the conductivity of the sheets increased but for a longer time no significant increase was observed compared to 8 min. Raman spectroscopy also showed that the increase in plasma radiation led to an increase in defects within the sheets. The appearance of defects in rGo improved its sensitivity to oxygen (O2) gas, but nevertheless reduced its recovery time. Therefore, by introducing the plasma bombardment process in a completely controlled way, we showed that the sensitivity and recovery time of rGo can be effectively tuned.
In this paper, the molybdenum disulfide (MoS2)/copper oxide (CuO) heterostructure is introduced in a very simple way for photoelectrochemical application. MoS2 multilayers were prepared by sonication method and decorated with copper oxide nanoparticles through its thin film deposition layer and heating in argon atmosphere. SEM, TEM, AFM, absorption and Raman analyses were employed to characterize the nanostructures. The results show that the presence of copper oxide nanoparticles reduces the recombination rate of photogenerated electron-holes in MoS2 multilayers and produces a significant photocurrent compared to the individual MoS2 electrode. Such a proposed structure demonstrates a high potential for photoelectrochemical applications.
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