Analysis of the electrical characteristics and modifications in the crystalline structure of graphite under UV radiation

IF 1.6 3区工程技术 Q3 CHEMISTRY, INORGANIC & NUCLEAR Applied Radiation and Isotopes Pub Date : 2025-03-15 DOI:10.1016/j.apradiso.2025.111783

Jessica Paola Córdova-Fraga , Estefanía Alejandra Hernández-Rangel , Gonzalo Páez-Padilla , Svetlana Kashina , José Marco Balleza-Ordaz , Angélica Hernández-Rayas , Francisco Miguel Vargas-Luna , Modesto Antonio Sosa-Aquino

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Abstract

Raman intensity ratio ID/IG was analyzed for 2B and 9B graphite-rich pencil rods of 2.6 mm thickness were irradiated by (a) Ultraviolet (UV) sources of 1.12 mW and 2.7 mW; (b) photons doses from 1 to 20 Gy delivered by an Elekta Linac. Additionally, an electrical characterization was carried out using the UV source to analyze the electrical properties of the materials. Graphite exhibits an oscillatory behavior due to the creation and annihilation of defects, thanks to sp2 and sp3 hybridizations in the hexagonal structure. This behavior is observed with both ionizing and non-ionizing sources. Proving that this phenomenon does not depends on the thickness of the material. For the 2B irradiated with UV of 1.12 mW, an underdamped response is observed, for which a mathematical model is presented. Nevertheless, 9B samples exhibit a “fading” response, maintaining the behavior for up to two weeks after the irradiation. In the electrical characterization, this phenomenon has been analyzed before, but the model was compared to a discharge of a capacitor is presented. The results confirmed the behavior of the material mentioned in other articles, but it also shows that the Raman intensity decreases with time, as well as the material's capacity to discharge as a capacitor.

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分析了厚度为 2.6 mm 的 2B 和 9B 富石墨铅笔棒的拉曼强度比 ID/IG，这些铅笔棒分别接受了 (a) 1.12 mW 和 2.7 mW 的紫外线 (UV) 源；(b) Elekta Linac 提供的 1 至 20 Gy 的光子剂量的照射。此外，还使用紫外线源进行了电学表征，以分析材料的电学特性。由于六边形结构中的 sp2 和 sp3 杂化，缺陷的产生和湮灭使石墨表现出振荡行为。电离源和非电离源都能观察到这种行为。证明这种现象与材料厚度无关。对于用 1.12 mW 紫外线照射的 2B 样品，观察到了欠阻尼响应，并给出了数学模型。然而，9B 样品表现出一种 "衰减 "响应，在辐照后的两周内仍能保持这种行为。在电气特性分析中，以前也分析过这种现象，但将模型与电容器放电进行了比较。结果证实了其他文章中提到的材料行为，但也表明拉曼强度会随着时间的推移而减弱，同时材料作为电容器的放电能力也会减弱。

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来源期刊

Applied Radiation and Isotopes 工程技术-核科学技术

CiteScore

3.00

自引率

12.50%

发文量

406

审稿时长

13.5 months

期刊介绍： Applied Radiation and Isotopes provides a high quality medium for the publication of substantial, original and scientific and technological papers on the development and peaceful application of nuclear, radiation and radionuclide techniques in chemistry, physics, biochemistry, biology, medicine, security, engineering and in the earth, planetary and environmental sciences, all including dosimetry. Nuclear techniques are defined in the broadest sense and both experimental and theoretical papers are welcome. They include the development and use of α- and β-particles, X-rays and γ-rays, neutrons and other nuclear particles and radiations from all sources, including radionuclides, synchrotron sources, cyclotrons and reactors and from the natural environment. The journal aims to publish papers with significance to an international audience, containing substantial novelty and scientific impact. The Editors reserve the rights to reject, with or without external review, papers that do not meet these criteria. Papers dealing with radiation processing, i.e., where radiation is used to bring about a biological, chemical or physical change in a material, should be directed to our sister journal Radiation Physics and Chemistry.