การเพิ่มประสิทธิภาพโฟโตแคตะไลติกภายใต้แสงช่วงที่มองเห็นของอนุภาคนาโนไททาเนียมไดออกไซด์-เหล็กออกไซด์ที่ถูกเคลือบบนฟิล์มท่อนาโนคาร์บอนผนังหลายชั้นโดยกระบวนการสปาร์คขั้นตอนเดียว

Abstract

Titanium dioxide (TiO2) composited iron oxide (Fe2O3) nanoparticles (NPs) were successfully deposited on multiwall carbon nanotubes (MWCNTs) films using low-cost and simple sparking process under atmospheric pressure. The as-deposited films were then annealed at 350 °C for 2 h to improve their crystallinity. The results show the anatase-TiO2 and hematite-Fe2O3 NPs with the size of 5-10 nm are coated on MWCNTs with the size of 20 nm. Iron oxide particles are added to reduce the minimum of energy band gap 2.76 eV corresponding to the visible light wavelength. Photocatalytic activity of the annealed films under visible iradiation is greater than the as-prepared films. Moreover, TiO2:Fe2O3 with the ratio of 3:1 was the optimized condition. Interestingly, the relative current of the annealed films increased to 0.75 when increasing the irradiation time for 5 h. This result confirmed that the exeited electron from photocatalytic activity can be transferred through the MWCNTs. This is an alternative way to produce the electric current from photocatalysis in the future.