This volume of the journal "Nano Hybrids and Composites" contains peer-reviewed manuscripts depicting 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 investigating modern functional materials.