伽玛辐射对PVDF-PMMA/MCTBO纳米复合材料结构、电学、光学和介电性能的影响

IF 4.6 2区物理与天体物理 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Results in Physics Pub Date : 2025-09-18 DOI:10.1016/j.rinp.2025.108442

Faisal F.D. Alotaibi , A. Rajeh , Asmaa M. Elzayat , W.M. Awad , E.M. Abdelrazek

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引用次数: 0

摘要

采用浇铸法制备了以聚甲基丙烯酸甲酯（PMMA）和聚偏氟乙烯（PVDF）为基体的多壁碳纳米管和氧化铋纳米颗粒（MCTBO NP），制备了不同重量百分比的聚合物纳米复合材料（PNC）。制备的薄膜在100 kGy的伽马射线照射下进行结构和功能修饰。x射线衍射（XRD）分析表明，掺杂MCTBO导致非晶相明显增加，结晶度相应降低。这种结构转变进一步得到了Urbach能量从0.175 eV增加到3.25 eV的支持，特别是在辐照后，表明结构无序性增强。扫描电子显微镜（SEM）证实了纳米颗粒在聚合物基体中的均匀分散，验证了纳米填料的成功集成。光学表征表明，掺杂MCTBO后光学带隙（间接）明显减小，从3.87 eV减小到3.18 eV，辐照后进一步减小到2.36 eV。这种减少是由于交联增加和辐射照射引起的局域状态的引入。Tauc图表明，辐照和未辐照样品的光跃迁均为间接型。此外，随着MCTBO含量和γ辐照的增加，Urbach能量增加，反映了更大的电子无序性。此外，对辐照前后的电导率和介电性能进行了评价。结果表明，随着MCTBO浓度的增加和辐照后，介电常数和电导率均有所提高，表明电荷输运特性有所改善。在所有样品中，含有6 wt% MCTBO的PMMA/PVDF纳米复合材料表现出最优越的性能，超过了原始混合物和未辐照的混合物。增强的结构、光学和电学性能突出了这些辐照纳米复合材料在光电器件、能量存储系统和辐射屏蔽材料中的先进应用潜力。

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Effect of gamma radiation on the structure, electrical, optical, and dielectric properties of PVDF-PMMA/MCTBO nanocomposites for electrochemical and optical applications

Polymer nanocomposites (PNC) based on polymethyl methacrylate (PMMA) and polyvinylidene fluoride (PVDF) were synthesized by the casting technique, incorporating different weight percentages of multi-walled carbon nanotubes and Bismuth oxide nanoparticles (MCTBO NP). The prepared films were subjected to 100 kGy of gamma irradiation to investigate structural and functional modifications. X-ray diffraction (XRD) analysis revealed that doping with MCTBO led to a notable increase in the amorphous phase and a corresponding decrease in crystallinity. This structural transition was further supported by an increase in Urbach energy from 0.175 eV to 3.25 eV, particularly after irradiation, indicating enhanced structural disorder. Scanning electron microscopy (SEM) confirmed the uniform dispersion of nanoparticles throughout the polymer matrix, verifying successful integration of nanofillers. Optical characterization demonstrated a significant reduction in the optical band gap (indirect), which decreased from 3.87 eV to 3.18 eV upon MCTBO doping, and further to 2.36 eV after irradiation. This reduction is attributed to increased cross-linking and the introduction of localized states resulting from radiation exposure. Tauc’s plots indicated that the optical transitions in both irradiated and non-irradiated samples are of the indirect type. Moreover, the Urbach energy increased with both higher MCTBO content and gamma irradiation, reflecting greater electronic disorder. Additionally, electrical conductivity and dielectric properties were evaluated before and after irradiation. Results demonstrated enhanced dielectric constant and electrical conductivity with increasing MCTBO concentration and post-irradiation, suggesting improved charge transport characteristics. Among all samples, the PMMA/PVDF nanocomposite containing 6 wt% MCTBO exhibited the most superior performance, surpassing both the pristine blend and its non-irradiated counterpart. The enhanced structural, optical, and electrical properties highlight the potential of these irradiated nanocomposites for advanced applications in optoelectronic devices, energy storage systems, and radiation shielding materials.

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来源期刊

Results in Physics MATERIALS SCIENCE, MULTIDISCIPLINARYPHYSIC-PHYSICS, MULTIDISCIPLINARY

CiteScore

8.70

自引率

9.40%

发文量

754

审稿时长

50 days

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