การเตรียมและการวิเคราะห์ฟิล์มอนุภาคนาโนไททาเนียมไดออกไซด์โดยกระบวนการสปาร์กภายใต้สนามไฟฟ้าและสนามแม่เหล็กภายนอก

Abstract

Nitrogen (N)-doped anatase/rutile TiO2 nanoparticulate (NP) films were successfully prepared by a sparking process under external electric (E) and magnetic (B) fields without heat treatment. Asdeposited NP films annealed at 250, 350, and 450 °C prepared by the sparking process without E and B fields were compared with as-deposited NP films prepared with E+B fields. The results clearly show that the quantity of the NP films increases after sparking under E and B fields. Interestingly, sparking under E+B fields can enhance both the film crystallinity and photocatalytic efficiency. Furthermore, N-doped TiO2 was observed only in NP films prepared by sparking under E+B fields. Doping with N not only plays an important role in enhancing the photocatalytic activity but also manipulates the spin polarization of TiO2 under E+B fields to enhance the film crystallinity and photocatalytic efficiency without the need for an annealing system.