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Title

Σύνθεση και θερμοχρωμικές ιδιότητες οξειδίων του Βαναδίου

Author

Γιαλαμά, Νιόβη

Thesis advisor

Κυριακίδης, Γεώργιος
Μπίνας, Β.

Abstract

Solid-state thermochromic materials undergo semiconductor to metal transitions at a ‘critical temperature’, Tc. This thesis begins by describing the phenomenon of thermochromism, whereby the optical properties of a material change reversibly as a result of a change in temperature. The various different types of thermochromism will be introduced with a focus on the thermochromism exhibited by solid-state materials. The fundamental chemical principles that describe the electronic structure and properties of solids, and the chronological developments in the theory behind the thermochromic transitions (such as, the effects of electron-electron interactions and structural phase changes due to lattice distortions) that led to the discovery of the semiconductor-to-metal transition, are presented. An extensive discussion of vanadium oxides is presented with a particular focus on vanadium dioxide since its transition temperature is closest to room temperature. Solid-state thermochromic materials may be exploited in areas such as microelectronics, data storage, or intelligent architectural glazing (smart windows), thus are required to be synthesised as thin films for use in such applications. The numerous synthetic techniques (PVD, sol-gel method, PLD, CVD, APCVD and AACVD), for making vanadium oxide thermochromic thin films are also described .

Language

Greek

Subject

Physical vapor deposition

Θερμοχρωμικά υλικά

Οξείδια μετάλλων

Issue date

2014-07-25

Collection

School/Department--School of Sciences and Engineering--Department of Physics--Graduate theses

Type of Work--Graduate theses

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