STUDY OF ELECTRICAL CONDUCTIVITY BETWEEN GRAINS ON THE SNO2-TIO2 COMPOSITE SYSTEM WITH THE ADDITION OF ZNO

• Main Author: Hanifan, Rozan
• Format: Final Project
• Language: Indonesia
• Subjects: Kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/52281
• Institution: Institut Teknologi Bandung

Semiconductors are electrical materials whose conductivity is determined by the concentration and mobility of electrons and holes. One of the applications of semiconductors are photocatalyst. Semiconductor materials that can be applied to photocatalysts are SnO2, TiO2 and ZnO. However, the photocatalytic efficiency of these three materials tends to be low due to their low charge separation efficiency. One method that can be used to increase the efficiency of charge separation is by coupling two or more semiconductors with similiar band gap into a composite system. SnO2, TiO2 and ZnO have band gaps of 3.6 eV, 3.2 eV, and 3.4 eV respectively, so the formation of the SnO2-TiO2-ZnO composite system is expected to have a higher charge separation efficiency. However, the formation of a composite system will cause the formation of barriers on the intergrain. The barriers can act as electrical trap and hinder the charge transfer process. Therefore, a study of the intergrain conductivity in the SnO2-TiO2- ZnO composite system needs to be conducted. From this research, it was obtained a pure SnO2- TiO-ZnO composite system and the information on the electrical transfer mechanism that is electrons transfers from ZnO to TiO2 and hole transers from SnO2 to TiO2.