Bi_2Ti_2O_7薄膜的自组装法制备及表征(英文)  

Preparation and Characterization of Bi_2Ti_2O_7 Thin Films from Self-Assembled Monolayer Technique

作　　者：夏傲[1] 黄剑锋[1] 谈国强[1] 尹君[1] 

机构地区：[1]陕西科技大学教育部轻化工助剂化学与技术重点实验室,西安710021

出　　处：《无机化学学报》2013年第7期1545-1550,共6页Chinese Journal of Inorganic Chemistry

基　　金：国家青年科学基金(No.51002092);陕西省自然科学基金(No.2010JM6013)资助项目

摘　　要：以Bi(NO3)3·5H2O和Ti(OC4H9)4为原料,采用自组装单层膜技术,在负载有功能化三氯十八烷基硅烷(octadecyl-trichloro-silane,OTS)的FTO基板上制备了Bi2Ti2O7薄膜。基板表面的亲水性测试表明,紫外照射使OTS自组装单层膜表面由疏水转变为亲水,实现功能化。借助X射线衍射(XRD)、X射线能量色散谱(EDS)、扫描电子显微镜(SEM)和原子力显微镜(AFM)分析分别对Bi2Ti2O7薄膜的组成、结构和微观形貌进行了表征。结果表明,沉积溶液浓度为0.02 mol·L-1时,所得Bi2Ti2O7薄膜均匀致密。560℃热处理1 h、厚度为0.4μm的Bi2Ti2O7薄膜在100 kHz的介电常数为153,介电损耗为0.089。Bi2Ti2O7 thin films were prepared on the fluorine-doped SnO2 （FTO） substrates by self-assembled functionalized octadecyl-trichloro-silane （OTS）-covered monolayer （SAM） technique using Bi（NO3）3·5H2O and Ti （OC4H9）4 as raw materials. The test of the hydrophilicity of the substrate surface indicates that UV irradiation turns the surface of OTS-SAM film from hydrophobicity to hydrophilicity and realizes the funetionalization. The composition, microstructure and microtopography of Bi2Ti2O7 thin films were characterized by X-ray Diffraction （XRD）, Energy Dispersive X-ray Spectrometry （EDS）, Scanning Electron Microscopy （SEM） and Atomic Force Microscope （AFM）. The results indicate that the as-prepared Bi2Ti207 thin films are homogeneous and dense when the concentration of the deposited solution is 0.02 mol .L-1. The dielectric constant is 153 at 100 kHz and the dielectric loss is 0.089 for a 0.4μm-thick film annealed at 560 ℃ for 1 h.

关 键 词：Bi2Ti2O7 薄膜 自组装单层膜 介电性能 

分 类 号：O614.532[理学—无机化学] TB43[理学—化学]