The light photoresponse, the separation of photogenerated charge carriers and the specific surface area are of great importance for the development of semiconductor-based photocatalysts. We report the anchorage of small-sized ZnO nanorods with a length of ca. 38 nm at the surface of graphitic carbon nitride (gCN) sheets. The gCN loading in the ZnO/gCN composites was varied and the materials characterized by TEM, XRD, XPS, BET and UV-vis diffuse reflectance spectroscopy. The ZnO/gCN (10 %) composite exhibits a high photocatalytic activity for the degradation of dyes (Orange II, Resazurin and Reactive Black 5) under visible light irradiation of low intensity (2.5 mW/cm 2 ) and for salicylic acid under simulated sunlight irradiation (5 mW/cm 2 ). These results are supported by photoluminescence, photocurrent and electrochemical impedance spectroscopy measurements. The photocatalytic activity originates from synergistic effects in ZnO/gCN composites including a high specific surface area (60.4 m 2 /g), an enhanced visible light absorption capacity and the charge carriers separation. The ZnO/gCN photocatalyst exhibits a high stability and could be reused up to ten times with no loss of efficiency. A mechanism is proposed for the degradation of dyes using the ZnO/gCN composites.
This review devoted to nanoscience with atmospheric pressure plasmas shows how nanomaterials are synthesised locally using three main ways: localized PECVD, nanoparticles and templates. On the other hand, self-organization of nano-objects on surfaces is driven by electric fields, stress and high temperatures. We show that the specificities of plasmas at high pressure, as their small size, their self-organization or their filamentation have been little exploited in the synthesis of nanomaterials. Finally, perspectives in the field are given.
This review contains a theoretical background of optical emission spectroscopy and some selected examples of issues in the field of atmospheric plasmas. It includes elements like line broadening, emission of continua and molecules, radiation models, etc. Modernized expressions figuring the terms hidden in global constants where cgs units prevail are given together with restrictions of use. Easy-to-use formulas are provided to give access to essential plasma parameters.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.