{"title":"Third order nonlinear optical properties of undoped and Bi-doped ZnO-ZrO2 nanocomposites","authors":"","doi":"10.1016/j.molstruc.2024.139918","DOIUrl":null,"url":null,"abstract":"<div><p>Undoped and Bi doped ZnO – ZrO<sub>2</sub> nanocomposites (NCs) at various concentrations (5%, 7% and 9%) were synthesized using precipitation method. All samples underwent calcination at 500°C for 4 h and their structural, elemental, morphological, and optical characteristics were comprehensively investigated. The X-ray diffraction (XRD) pattern revealed a monoclinic phase due to the incorporation of Zirconium (Zr). The crystallite size of undoped, 5%, 7%, and 9% Bi-doped ZnO – ZrO<sub>2</sub> nanocomposites were determined as 41.10 nm, 35.89 nm, 34.53 nm and 29.73 nm respectively. Field emission scanning electron microscopy (FE – SEM) and elemental dispersive study (EDS) affirmed the successful incorporation of bismuth into ZnO – ZrO<sub>2</sub> system. Furthermore, elemental mapping confirmed the even distribution of Zn, Zr and bismuth in the prepared nanocomposites. Linear optical absorption spectra for undoped and Bi-doped samples were obtained using UV diffused reflectance spectroscopy (UV–DRS). The optical energy band gap (Eg) was calculated employing Kubelka – Munk theory exhibiting variations in the direct band gap among the synthesized nanocomposites due to Bi doping. Photoluminescence spectrum provided characteristic peaks for undoped, 5%, 7% and 9% Bi doped ZnO – ZrO<sub>2</sub> nanocomposites.The nonlinear optical response of these samples is investigated using Z-scan technique with nano pulsed Nd: YAG laser. Compared to undoped material, the 9% Bi doped nanocomposite exhibits a robust optical limiting threshold (1.41×10<sup>12</sup> m/W<sup>2</sup>) suggesting its potential application in laser safety devices.</p></div>","PeriodicalId":16414,"journal":{"name":"Journal of Molecular Structure","volume":null,"pages":null},"PeriodicalIF":4.0000,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Molecular Structure","FirstCategoryId":"92","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S002228602402427X","RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Undoped and Bi doped ZnO – ZrO2 nanocomposites (NCs) at various concentrations (5%, 7% and 9%) were synthesized using precipitation method. All samples underwent calcination at 500°C for 4 h and their structural, elemental, morphological, and optical characteristics were comprehensively investigated. The X-ray diffraction (XRD) pattern revealed a monoclinic phase due to the incorporation of Zirconium (Zr). The crystallite size of undoped, 5%, 7%, and 9% Bi-doped ZnO – ZrO2 nanocomposites were determined as 41.10 nm, 35.89 nm, 34.53 nm and 29.73 nm respectively. Field emission scanning electron microscopy (FE – SEM) and elemental dispersive study (EDS) affirmed the successful incorporation of bismuth into ZnO – ZrO2 system. Furthermore, elemental mapping confirmed the even distribution of Zn, Zr and bismuth in the prepared nanocomposites. Linear optical absorption spectra for undoped and Bi-doped samples were obtained using UV diffused reflectance spectroscopy (UV–DRS). The optical energy band gap (Eg) was calculated employing Kubelka – Munk theory exhibiting variations in the direct band gap among the synthesized nanocomposites due to Bi doping. Photoluminescence spectrum provided characteristic peaks for undoped, 5%, 7% and 9% Bi doped ZnO – ZrO2 nanocomposites.The nonlinear optical response of these samples is investigated using Z-scan technique with nano pulsed Nd: YAG laser. Compared to undoped material, the 9% Bi doped nanocomposite exhibits a robust optical limiting threshold (1.41×1012 m/W2) suggesting its potential application in laser safety devices.
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