Structural and Photoluminescence Studies of p-(n-heptyl) Benzoic Acid Liquid Crystals Dispersed with ZnO Nanoparticles

IF 0.8 4区化学 Q4 SPECTROSCOPY

Journal of Applied Spectroscopy Pub Date : 2024-09-13 DOI:10.1007/s10812-024-01794-w

P. Jayaprada, M. C. Rao, B. T. P. Madhav, P. Pardhasaradhi, R. K. N. R. Manepalli

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Abstract

Synthesis, structural and photoluminescence studies of p-(n-heptyl) benzoic acid (7ba) liquid crystalline (LC) compound with the homogeneous dispersion of ZnO nanoparticles (NPs) in different weight concentrations (i.e., 1–2.5 wt.%) were undertaken. The synthesized samples were subsequently characterized by different characterization techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-visible (UV-Vis) spectroscopy, differential scanning calorimetry (DSC), optical polarising microscopy (POM), Fourier transform infrared spectroscopy (FT-IR), and photoluminescence (PL) spectroscopy. From the XRD studies, the diff raction peaks observed were well resolved indicating the presence of ZnO NPs. The particle size was found to be 60 nm. SEM studies revealed the uniform dispersion and the presence of ZnO NPs in the LC samples. From the DSC analysis, the temperatures at which the phase changes take place and the corresponding enthalpy values were estimated. FTIR spectra gave information about the various functional groups present in the samples. PL studies showed the peak at 663 nm due to the presence of point defects within the bandgap-like vacancies and interstitials known as deep-level emission.

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对(正庚基)苯甲酸液晶与 ZnO 纳米粒子分散的结构和光致发光研究

研究人员采用不同重量浓度（即 1-2.5 wt.%）的 ZnO 纳米粒子（NPs）均匀分散对（正庚基）苯甲酸（7ba）液晶（LC）化合物，对其进行了合成、结构和光致发光研究。随后采用不同的表征技术对合成样品进行了表征，如 X 射线衍射 (XRD)、扫描电子显微镜 (SEM)、紫外可见 (UV-Vis) 光谱、差示扫描量热法 (DSC)、光学偏振显微镜 (POM)、傅立叶变换红外光谱 (FT-IR) 和光致发光 (PL) 光谱。从 XRD 研究中观察到的衍射峰分辨良好，表明存在氧化锌 NPs。粒径为 60 纳米。扫描电子显微镜研究表明，LC 样品中的 ZnO NPs 分散均匀且存在。通过 DSC 分析，可以估算出发生相变的温度和相应的焓值。傅立叶变换红外光谱提供了样品中存在的各种官能团的信息。聚光研究显示，由于带隙内存在点缺陷--空位和间隙，在 663 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

Journal of Applied Spectroscopy SPECTROSCOPY-

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.