effect of Au nano sheets thickness on the optical dynamics of MnO: nano stacked layers رسالة ماجستير

Abstract

In this thesis, manganese oxide thin films are prepared by a vacuum evaporation technique under a vacuum pressure of 10 mbar. The films are then sandwiched with Au nanosheets in the range of 5-100 nm. The structural, optical and dielectric properties of the films are studied by the X-ray diffraction and optical spectrophotometry techniques. It is observed ڻthat‎ MnoO:/AwMnOaznanofilms are of amorphous nature due to the possible existence of more than one polymorphic phase in its structure. Insertion of Au nanosheets between layers of MnO2 successfully enhanced the optical reflectivity and engineered the energy band tails, energy band gap and dielectric constant as well. The achievements are presented by band gap narrowing and increasing of the dielectric constant value. It is also observed that the exponential distribution of energy band tails become wider as a result of Au/MnO2 orbital states overlapping. In the light of the above mentioned properties MnO2 nanosheets can be nominated for optoelectronic applications.