İyi Elektrokromik Performans Gösteren WO3 Nanoplakaların Çekirdeklenmiş FTO Üzerine Yeni Sentezi

Year 2021, Issue: 27, 718 - 722, 30.11.2021

Sibel Morkoç Karadeniz

https://doi.org/10.31590/ejosat.937476

Abstract

Tungsten trioksit (WO3), çeşitli elektrokromik cihazlarda uygulamalara sahiptir ve elektrokromik özelliklerini etkileyen çeşitli teknikler kullanılarak üretilir. Bu çalışmada, tungsten trioksit (WO3) nanoplakalar, tohumlanmış flor katkılı kalay oksit (FTO) cam altlıklar üzerinde hidrotermal teknik kullanılarak iki aşamalı bir kolay bir sentezleme süreci ile sentezlenmiştir. Yüksek gözenekli WO3 nanoplakalar hızlı ve kolay hidrotermal metot kullanılarak sentezlenmiştir. Öncesinde Döndürmeli Kaplama işlemi kullanılarak FTO üzerine bir çekirdek tabaka büyütülmüştür. WO3 nanoplakalar ise, 200 ˚C de 1 saat süreyle hidrotermal teknik kullanılarak çekirdek tabaka oluşturulmuş FTO camların üzerine hızlı bir şekilde sentezlenmiştir. Bu yapılar XRD, SEM, Kronoamperometri ve Döngüsel Voltametri teknikleri ile karakterize edilmiştir. WO3 nanoplakalar, monoklinik ve hegzagonal kristal fazın karışımı olan bir kristal yapısına sahiptirler. Filmin kristal parçacık boyutu sırasıyla (011) ve (200) en şiddetli monoklinik ve hegzagonal kristal fazları için 36 ve 53 nm olarak hesaplandı. WO3 nanoplakaların anahtarlanma süreleri renklenme için 1.28 s ve şeffaflaşma için 5.50 saniye olarak bulundu aynı zamanda difüzyon katsayısı da 4.2×10-10 cm2/s olarak belirlendi. Sonuç olarak yüksek gözenekliliğe sahip nanoplaka yapılar başarıyla elde edilmiş ve WO3 nanoplakalar, iyi bir kristal yapısı, yüksek difüzyon katsayısı ve kısa iyon ekleme süresi ile iyi elektrokromik performans göstermiştir.

Keywords

Nanoplakalar, WO3, Hidrotermal Metot

Novel Synthesis of Good Electrochromic Performance WO3 Nanoplates Grown on Seeded FTO

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 cm2/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.

Keywords

Nanoplates, WO3, Hydrothermal Method

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