İyi Elektrokromik Performans Gösteren WO3 Nanoplakaların Çekirdeklenmiş FTO Üzerine Yeni Sentezi

Abstract

Tungsten trioxide (WO3) has applications in various electrochromic devices and is fabricated using various techniques, which affect its electrochromic properties. In this study, tungsten trioxide (WO3) nanoplates were synthesised via a two-step facile synthesis process using a hydrothermal technique on seeded fluorine-doped tin oxide (FTO) glass substrates. WO3 nanoplates with high porosity were obtained using a fast and simple hydrothermal method. First, a seed layer was grown on FTO using a spin coating process. WO3 nanoplates were then quickly synthesised on the seeded FTO glass using a hydrothermal technique at 200 ˚C for 1h. The nanoplates were characterizated by using XRD, SEM, Chronoamperometry and Cyclic Voltammetry techniques. The WO3 nanoplates have got a crystal structure mixed monoclinic and hexagonal phases. The crystal grain sizes of the film was found to be 36 and 53 nm for the (011) and ( 200) sharpest crystal planes of monoclinic and hexagonal crystal phases respectively. The switching times of WO3 nanoplates were determined as 1.28 s for colouration and 5.50 s of bleaching, and the diffusion coefficient was calculated as 4.2×10 -10 cm 2 /s. As a result, the nanoplate structures with high porosity were successfully obtained and the WO3 nanoplates showed good electrochromic performance with a good crystal structure, high diffusion coefficient, and short ion insertion time.