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The present review provides an overview of the basic theory of sputtering with recent models, focusing in particular on sputtered atom energy distribution functions. Molecular models such as Monte-Carlo, kinetic Monte-Carlo, and classical Molecular Dynamics simulations are presented due to their ability to describe the various processes involved in sputter deposition at the atomic and molecular scale as required. The sputter plasma, the sputtering mechanisms, the transport of sputtered material and its deposition leading to thin film growth can be addressed using these molecular simulations. In all cases, the underlying methodologies and some selected mechanisms are highlighted. Graphic abstract

In this study, we employed an atmospheric-pressure non-thermal plasma jet that used silver nitrate solution as the precursor which is injected, in an aerosol state, into the plasma jet to create silver nanoparticles with the desired distribution on the glass substrate. The crystal structure and morphology of the Ag nanoparticles printed on the glass substrate were characterized by X-ray diffraction (XRD), the field emission scanning electron microscope (FESEM), and the atomic force microscope (AFM). The XRD patterns confirm Ag nanostructure deposition on the glass. FESEM results show that Ag nanoparticles’ are almost spherical in shape and by increasing the applied voltages, the Ag nanoparticles' size and density increases, and AFM images confirm the results of FESEM images. Rhodamine B with various concentrations was employed to determine the surface-enhanced Raman scattering (SERS) performance of Ag nanoparticles printed on the glass. It shows high sensitivity for Ag layers created by plasma to a threshold that even for the lower concentrations of 10 −10 M, Rhodamine B is still detectable. There was the optimum SERS effect at a 7 kV voltage. Also, the plasma-printed Ag layers are able to detect methylene blue, usually used as a fungicide in fish ponds and aquariums, even in low concentrations of 10 −9 M. The residual sulfur dioxide (SO 2 ) of raisins was detected using a plasma-printed silver layer. This shows the application of this plasma-printed silver layer for residual SO 2 detection in the food industry. Graphical abstract

This paper focuses on the use of an electro-optic (EO) probe for the spatially and temporally resolved characterization of the electric field (E-field) associated with guided ionization waves—or guided streamers—propagating at atmospheric pressure. An AC high-voltage power supply (6 kV at 18 kHz) is used to generate guided ionization waves in helium with a cold atmospheric pressure plasma jet device (APPJ). The capabilities of this electro-optic technique are investigated with and without the discharge. This innovative technology will use to carry out the optical polarimetric analysis of the APPJ with simultaneous real-time measurement of longitudinal and radial components of the electric field vector. Last but not least, an application-based case study of the ionization waves propagating and interacting with the EO probe—being a solid dielectric target—is also reported. The results will bring realistic information on the potential perturbation induced by the EO probe itself on the E-field characterization at the macroscopic scale. Graphic abstract

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