Hu Xingfang

Single-layer heat mirror films and an improved method for evaluation of its optical and radiative properties in infrared

A technique for preparing single heat mirror films with high quality is described. We also present an improved method for evaluating its optical and thermal radiative properties in the infrared region (2.5 < λ < 25 μm). The calculated results agree well with that obtained by experimental measurements. The results calculated by using the simple Hagen-Rubens relation are also given. It is shown that the Hagen-Rubens relation is not accurate to predict the thermal radiative properties for the transparent semiconducting oxide films, such as indium tin oxides. prepared in our studies.

Calculating method of the equivalent thermal conductivity of functionally gradient materials

The concept of the equivalent thermal conductivity of functionally gradient materials (FGM) was presented, together with the introduction of a method to calculate it. This method has its significance not only in guiding the design of composition, structure and properties of FGM, but also in accelerating the process of their utilization.

X-ray photoelectron spectroscopy study on electrochromic V2O5 thin film

Nanocrystalline V2O5 thin films were reactively radio-frequency magnetron-sputtered under optimal deposition parameters. Their electrochemical and electrochromic characteristics were investigated by cyclic voltammetry and in-situ monochromatic transmittance measurements. Upon lithium intercalation, V2O5 thin films showed a double electrochromic behavior depending on the wavelength and the intercalation extent. X-ray photoelectron spectroscopy results showed that part of the V5+ in V2O5 was reduced to V4+ during the Li+ intercalation process.

Nanostructure Control in the Preparation of Smart Window Materials

Publisher Summary The idea of nano-structure control was firstly successfully used to prepare a nano-granular film with high ionic conductance and good electroehromic performance. It is proposed that the nano-interface (grain boundaries) can provide a preferred migration pathway for alkali metal ions and the electrochromic reaction of the films takes place at the interfaces where the vacancies and defects reversibly were compensated and de-compensated by the alkali metal ions inject and extract. Interfacial structure of nano-granular films could be changed from “highly disordered” to “highly ordered” through control of deposition parameters and post-deposition treatment. As a result, the conductivity characteristics of films can be controlled and the film structure and property can be designed and tailored according to the application requirements.