当前位置: X-MOL 学术Thin Solid Films › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Thickness and ion irradiation induced structural phase changes in the thin films of titanium dioxide
Thin Solid Films ( IF 2.1 ) Pub Date : 2021-09-08 , DOI: 10.1016/j.tsf.2021.138917
P. Devaraj 1 , R. Meena 1 , P. Sivakumar 1 , P. Peranantham 1 , V.V. Siva Kumar 2 , K. Asokan 2 , Y.L. Jeyachandran 1
Affiliation  

Titanium dioxide (TiO2) thin films of thicknesses in the range of 20–60 nm were deposited by sol-gel dip coating method, and their structural and morphological properties before and after irradiation with 100 MeV Ni7+ ions were investigated. A systematic analysis of the hydrolysis reaction in the sol and films showed that complete hydrolysis of the precursor in the films can occur at room temperature in air ambient. However, aging of the sol for a minimum of 24 h prior to coating and drying / annealing the films at temperatures above 150 °C after deposition can favor the formation of regular –O–Ti–O– structural framework. The structural studies revealed a thickness dependent phase change in the films. Then it was found that this phase change can be precisely reversed by ion irradiation. The mixed rutile-anatase phase evolved towards pure anatase phase with increase in the thickness of the films, and that exactly traced back up on irradiation with increase in the ion fluence. The morphological studies showed a progress of the large island like structure with voids in the pristine film towards homogeneous nanosized particles and continuous morphology upon irradiation with increase in the ion fluence. The observed thickness and ion irradiation dependent structural and morphological changes of the TiO2 films can be used for tuning precisely their structural phase and morphology, which is relevant for photo-catalysis and sensing applications.



中文翻译:

厚度和离子辐射引起的二氧化钛薄膜结构相变

通过溶胶-凝胶浸涂法沉积厚度在 20-60 nm 范围内的二氧化钛 (TiO 2 ) 薄膜,及其在 100 MeV Ni 7 +辐照前后的结构和形态特性离子进行了研究。溶胶和薄膜中水解反应的系统分析表明,薄膜中前体的完全水解可以在室温和空气环境中发生。然而,在沉积后在高于 150°C 的温度下对薄膜进行涂覆和干燥/退火之前,溶胶老化至少 24 小时可以有利于形成规则的 -O-Ti-O- 结构框架。结构研究揭示了薄膜中依赖于厚度的相变。然后发现这种相变可以通过离子照射精确逆转。随着薄膜厚度的增加,混合的金红石-锐钛矿相演变为纯锐钛矿相,并且随着离子注量的增加,这恰好可以追溯到辐照。形态学研究表明,随着离子注量的增加,原始薄膜中具有空隙的大岛状结构向均匀的纳米颗粒和连续形态发展。观察到的 TiO2 的厚度和离子辐射依赖的结构和形态变化2薄膜可用于精确调整其结构相和形态,这与光催化和传感应用相关。

更新日期:2021-09-14
down
wechat
bug