Characterization of titania thin films grown by dip-coating technique
Characterization of titania thin films grown by dip-coating technique
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DOI：
10.1007/s10854-016-4985-4
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发表时间：
2016-12-01
影响因子：
2.8
通讯作者：
Chaure, Nandu B.
中科院分区：
文献类型：
--
作者：
Dastan, Davoud;Panahi, Seyedeh Leila;Chaure, Nandu B.
采用浸渍提拉法制备了锐钛矿型二氧化钛薄膜。采用掺氟二氧化锡为衬底制备了二氧化钛薄膜。样品在550A℃下热处理18h，X-射线衍射仪分析表明，合成样品和热处理样品分别为无定形和锐钛矿相的二氧化钛。热处理后的锐钛矿型二氧化钛薄膜的微晶尺寸约为25 nm。紫外可见光谱证实了所制备和焙烧的二氧化钛薄膜的禁带宽度分别为3.86和3.64 eV。能带隙的减小可能是由于焙烧后小颗粒的结晶和团聚发生了变化。用场发射扫描电子显微镜对所制备的薄膜进行了形貌分析，结果表明所制备的薄膜为球形的二氧化钛颗粒，平均粒径约为30 nm。用傅里叶变换红外光谱(FTIR)对样品的分子性质(化学键)进行了研究。FTIR分析表明，产物中有二氧化钛生成、官能团OH、C-OH基团的羟基伸缩振动、H-O-H的弯曲振动模式、烷基C-H伸缩、Ti-OH的伸缩带、CN的不对称伸缩和C=O饱和醛。
A dip-coating technique was employed to prepare anatase phase of titania thin films. Fluorine doped tin oxide substrates were used to prepare titania thin films. The samples were annealed at 550 A degrees C for 18 h. X-ray diffraction results revealed the amorphous and anatase phases of TiO2 for as-synthesized and annealed samples, respectively. The crystallite size of anatase TiO2 thin films was almost 25 nm for annealed samples. UV-visible confirmed the energy band gap 3.86 and 3.64 eV for as-prepared and calcinated titania thin films. The reduction in the energy band gap could be due to the change in crystallization and agglomeration of small grains after calcination. The morphology of the prepared films was investigated by field emission scanning electron microscopy which demonstrated the agglomeration of spherical particles of TiO2 with average particle size of about 30 nm. The molecular properties (chemical bonding) of the samples were investigated by means of Fourier Transform Infrared (FTIR) spectroscopy. FTIR analysis exhibited the formation of titania, functional group OH, hydroxyl stretching vibrations of the C-OH groups, bending vibration mode of H-O-H, alkyl C-H stretch, stretching band of Ti-OH, CN asymmetric band stretching, and C=O saturated aldehyde.