Study of sulphur doped TiO2: Structural, morphological, optical and thermal properties

K. Soni, A. Sheikh, N. Lakshmi
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Abstract

Titanium dioxide (TiO2) is a widely used transparent conducting oxide which has found many applications in solar cell devices. In the present study we have synthesized 0.75 sulphur doped TiO2 (S-TiO2) by ball milling technique and investigated their structural, topological, optical and thermal properties. The crystallization, strain and particle size have been analyzed by X-ray diffraction and reveals the formation of single phase structure corresponding to anatase phase of TiO2. AFM investigations reveal a homogeneous surface morphology. FTIR spectroscopy confirms the presence of sulphur bonding in the TiO2 crystal structure. Band gap was calculated from the absorption spectrum of S-TiO2 obtained using UV-visible spectrophotometer. The value of 3.07 eV obtained as band gap for S-TiO2 is less than that of of anatase TiO2 (3.2 eV) thus shows shifting towards the longer wavelength on sulphur doping. DTA-TGA measurements also corroborate that S-TiO2 crystallizes in the anatase phase.Titanium dioxide (TiO2) is a widely used transparent conducting oxide which has found many applications in solar cell devices. In the present study we have synthesized 0.75 sulphur doped TiO2 (S-TiO2) by ball milling technique and investigated their structural, topological, optical and thermal properties. The crystallization, strain and particle size have been analyzed by X-ray diffraction and reveals the formation of single phase structure corresponding to anatase phase of TiO2. AFM investigations reveal a homogeneous surface morphology. FTIR spectroscopy confirms the presence of sulphur bonding in the TiO2 crystal structure. Band gap was calculated from the absorption spectrum of S-TiO2 obtained using UV-visible spectrophotometer. The value of 3.07 eV obtained as band gap for S-TiO2 is less than that of of anatase TiO2 (3.2 eV) thus shows shifting towards the longer wavelength on sulphur doping. DTA-TGA measurements also corroborate that S-TiO2 crystallizes in the anatase phase.
硫掺杂TiO2的结构、形态、光学和热性能研究
二氧化钛(TiO2)是一种广泛使用的透明导电氧化物,在太阳能电池器件中有许多应用。本文采用球磨技术合成了0.75硫掺杂TiO2 (S-TiO2),并对其结构、拓扑、光学和热性能进行了研究。通过x射线衍射分析了TiO2的结晶、应变和粒度,发现TiO2形成了与锐钛矿相对应的单相结构。原子力显微镜研究显示其表面形貌均匀。FTIR光谱证实了TiO2晶体结构中存在硫键。根据紫外可见分光光度计得到的S-TiO2的吸收光谱计算带隙。S-TiO2的带隙为3.07 eV,小于锐钛矿型TiO2的带隙(3.2 eV),因此在硫掺杂下,S-TiO2的带隙向更长的波长偏移。DTA-TGA测量也证实了S-TiO2在锐钛矿相结晶。二氧化钛(TiO2)是一种广泛使用的透明导电氧化物,在太阳能电池器件中有许多应用。本文采用球磨技术合成了0.75硫掺杂TiO2 (S-TiO2),并对其结构、拓扑、光学和热性能进行了研究。通过x射线衍射分析了TiO2的结晶、应变和粒度,发现TiO2形成了与锐钛矿相对应的单相结构。原子力显微镜研究显示其表面形貌均匀。FTIR光谱证实了TiO2晶体结构中存在硫键。根据紫外可见分光光度计得到的S-TiO2的吸收光谱计算带隙。S-TiO2的带隙为3.07 eV,小于锐钛矿型TiO2的带隙(3.2 eV),因此在硫掺杂下,S-TiO2的带隙向更长的波长偏移。DTA-TGA测量也证实了S-TiO2在锐钛矿相结晶。
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