Developing new environmentally friendly methods of producing materials for electronics is critical important task for material science. Manufacturing process of semiconductor materials, transparent electrodes, electrical and thermal conductive pastes, fillers for conductive inks and some other materials should be improved from environmental point of view. Here we present a waste-free closed cycle fabrication of two important materials for electronics based on the concept of a self-organized cracked template. Optically transparent silver meshes and silver microflakes were obtained in waste-free manufacturing cycle. The morphological, structural, optoelectric, and shielding properties of transparent silver meshes and silver microflakes films were studied in detail. Also, we made transparent heater in close manufacturing cycle. The first type of materials are transparent silver meshes with irregular structure that have a transparency of more than 80

The problem of sputtering of thick metal films on micro and nanotemplates is important for obtaining mesh transparent conductors with excellent optoelectric characteristics. In this work, we demonstrate for the first time the possibility of controlling the degree of peeling of the cell perimeter from the substrate for a cracked template based on egg white by alternating the operations of moistening the template with saturated water vapor and shock drying with hot air. Local peeling of the cracked template cells perimeter makes it possible to increase the thickness of the metal sputtered on the cracked template by more than 1 mu m, which is not achievable for other lithographic approaches. Our technique was used to obtain thick Ag meshes with a low sheet resistance of no more than 1.59 omega/sq and a transparency of about 89.1%. The thick Ag meshes show a shielding efficiency (SE) of 49 dB or 99.998% of the incident power of an electromagnetic wave at a frequency of 1 GHz. In a sandwich geometry, thick Ag meshes, which simulates a real shielding window, the shielding efficiency (SE) reaches 71 dB with a transparency of more than 80%.

Composite materials comprised of a ceramic matrix with metal-containing nanoparticles were prepared by sintering iron (II) oxalate and polycarbosilane. The chemical composition of the material can be controlled by a sintering process. Sintering in inert atmosphere leads to reduction of the sample and metal iron formation (a-Fe, carbide). Formation of iron oxides requires calcination procedure in series (argon and air) for removing by products. The air-sintering materials consist mainly of oxide phases, but also contain metal iron. The prepared samples were characterized by the: SEM, TEM, XRD and EMR techniques and the Mossbauer spectroscopy. It was shown unique behavior that iron containing particles after calcination in air decreased from 5-30 nm to 2-5 nm due to interaction with matrix under air atmosphere.

Methods for fabrication of materials that simultaneously exhibit high transparency in the visible spectral range and radio shielding in a wide frequency band are considered. The main structures of such materials (multilayer coatings and mesh structures) are analyzed and compared, and several technological procedures are considered. It is shown that optimization of the thickness and chemical composition of multilayer coatings and geometrical parameters of mesh structures can significantly improve their properties. Promising structures are proposed to obtain an optical transmission coefficient of 90–98

The paper focuses on the use of metamaterials for the improvement of existing microwave devices of the waveguide type. In particular, it describes theoretical and experimental studies of the transmission line based on coaxial waveguide containing metamaterial. Also, the possibility of using metamaterials for the creating a rejection filter based on such transmission line is shown.

This paper is a preliminary report on a theoretical study of transparent shielding materials with potentially very high shielding efficiency based on quasi-periodic conductive networks. An empirical model for rapid calculation of shielding efficiency vs frequency and mesh geometrical parameters is suggested based on numerical simulation results.