This volume of the journal "Nano Hybrids and Composites" presents readers a special collection of the peer-reviewed articles covering some practical aspects in the research of properties and application of semiconductors in optoelectronics and photonics, concrete composites with polymer additions, nanocomposites for an application as a catalyst in the hydrocracking of castor oil and polymeric fibre reinforced structural materials for the nanosatellites frameworks. This volume will be useful for many specialists from the area of modern functional materials.