Surfactants assisted solvothermal derived titania nanoparticles: synthesis and simulation
Surfactants assisted solvothermal derived titania nanoparticles: synthesis and simulation
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DOI：
10.1007/s10854-017-6474-9
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发表时间：
2017-06-01
影响因子：
2.8
通讯作者：
Kartha, Moses
中科院分区：
文献类型：
--
作者：
Dastan, Davoud;Chaure, Nandu;Kartha, Moses
采用溶剂热法在180 ℃生长温度下制备了不同形貌的二氧化钛纳米颗粒。以乙酸和油胺为表面活性剂。将TiO 2粉末在550和950 ℃下退火18和24 h。利用透射电子显微镜（TEM）研究了表面活性剂对二氧化钛纳米粒子形貌的影响。通过X射线衍射、紫外-可见光、光致发光和傅里叶变换红外光谱研究了二氧化钛纳米粒子的结构、光学和分子性质。用Brunauer-Emmett-Teller和Barrett-Joyner-Halenda方法对样品的比表面积和孔容进行了表征。结果表明，所有样品的IV型吸附等温线，这意味着介孔材料的特征（2-50 nm）。此外，滞后回线移动到较高的相对压力，表明比表面积增加，孔径减小后，热处理。从TEM获得的显微照片图像描绘了不同的形状，如不规则的球形，圆角矩形，截断菱形，和棒状的二氧化钛NP的，当使用各种表面活性剂。对纯相和金红石相的二氧化钛纳米粒子进行了蒙特-卡罗模拟，解释了二氧化钛纳米粒子的生长机理，证实了粒子间的相互吸引作用形成了球形结构，粒子间的相互排斥作用形成了棒状结构。
Solvothermal method was used to prepare titanium dioxide (TiO2) nanoparticles (NP's) of various morphologies at 180 degrees C growth temperature. Acetic acid and oley amine were used as surfactants. The powder of TiO2 was annealed at 550 and 950 degrees C for 18 and 24 h. The influence of surfactants on the morphology of titania NP's was investigated using transmission electron microscopy (TEM). The structural, optical, and molecular properties of titania NP's are investigated by means of X-ray diffraction, UV-visible, Photoluminescence, and Fourier Transform Infrared. The physical properties, surface area and pore volume, of the samples were investigated by Brunauer-Emmett-Teller and Barrett-Joyner-Halenda measurement. The results illustrated type IV adsorption isotherms for all samples, implying the characteristics of mesoporous materials (2-50 nm). Furthermore, the hysteresis loops shifted to higher relative pressure, indicating that the specific surface area increases and the pore size decreases after heat treatment. Micrograph images acquired from TEM portrayed different shapes such as irregular spherical, rounded rectangular, truncated rhombic, and rod-like for titania NP's when various surfactants were used. Monte-Carlo simulation carried out for pristine and rutile titania NP's as representative samples explained the growth mechanism of titania NP's and corroborated the formation of spherical and rod-like structures due to attractive and repulsive interactions among particle respectively.