Structural, Optical, and Photoluminescence Studies of ZnO Dispersed p(-n-decyloxy) Benzoic Acid Liquid Crystalline Compounds

IF 0.8 4区 化学 Q4 SPECTROSCOPY Journal of Applied Spectroscopy Pub Date : 2024-05-10 DOI:10.1007/s10812-024-01739-3
P. Jayaprada, M. C. Rao, B. Vasundhara, G. Manikya Rao, N. Krishna Mohan, R. K. N. R. Manepalli
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Abstract

The main theme of the paper was focussed on the preparation, structural, optical, and photoluminescence studuies of p(-n-decyloxy) benzoic acid (10OBA) liquid crystalline (LC) compounds with 1 wt.% dispersed ZnO nanoparticles (NPs). The prepared samples were subsequently characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), optical polarizing microscopy (POM), differential scanning calorimetry (DSC), UV-Visible spectroscopy, and photoluminescence (PL) studies. From the XRD, the diffraction peaks observed at 36.2, 42.5, 61.3, and 73.2° were well resolved, indicating the presence of ZnO NPs and the particle size was found to be 65 nm. SEM studies revealed the uniform dispersion and the presence of ZnO NPs in the samples. The textural images of different phases (nematic, smectic) of liquid crystalline compounds of 10OBA pure and 10OBA with 1 wt.% dispersed ZnO NPs were observed through the POM with reduced temperature. From the DSC thermograms, the phase transition temperatures and the correponding enthalpy values were estimated. The bandgap reduces for 10OBA LC compound with the dispersion of 1 wt.% ZnO NPS and it is estimated as 3.25 eV compared with 4.25 eV for the undoped 10OBA LC compound. PL studies showed the presence of the peak at 616 nm owing to the presence of point defects within the bandgap-like vacancies and interstitials known as deep-level emission.

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ZnO 分散对(-n-癸氧基)苯甲酸液晶化合物的结构、光学和光致发光研究
本文的主题是对(-n-癸氧基)苯甲酸 (10OBA) 与 1 wt.% 分散氧化锌纳米颗粒 (NPs) 的液晶 (LC) 化合物的制备、结构、光学和光致发光研究。制备的样品随后通过 X 射线衍射 (XRD)、扫描电子显微镜 (SEM)、光学偏光显微镜 (POM)、差示扫描量热法 (DSC)、紫外-可见光谱和光致发光 (PL) 研究进行了表征。在 XRD 中,在 36.2、42.5、61.3 和 73.2°处观察到的衍射峰分辨良好,表明存在 ZnO NPs,粒径为 65 nm。扫描电镜研究表明,样品中的 ZnO NPs 分散均匀且存在。通过降低温度的 POM,观察到纯 10OBA 和含有 1 wt.% 分散 ZnO NPs 的 10OBA 的液晶化合物的不同相(向列相、共晶相)的纹理图像。从 DSC 热图中可以估算出相变温度和相应的焓值。10OBA LC 化合物的带隙随着 1 wt.% ZnO NPS 的分散而减小,估计为 3.25 eV,而未掺杂的 10OBA LC 化合物的带隙为 4.25 eV。聚光研究表明,由于带隙内存在点缺陷(如空位和间隙),在 616 纳米处出现了峰值,这就是所谓的深层发射。
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来源期刊
CiteScore
1.30
自引率
14.30%
发文量
145
审稿时长
2.5 months
期刊介绍: Journal of Applied Spectroscopy reports on many key applications of spectroscopy in chemistry, physics, metallurgy, and biology. An increasing number of papers focus on the theory of lasers, as well as the tremendous potential for the practical applications of lasers in numerous fields and industries.
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