基於吸收光譜行為估計於不同曝光狀況下PQ/PMMA中PQ分子濃度;Estimation of PQ concentration in PQ/PMMA under exposure based on the absorption spectral properties

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题名:	基於吸收光譜行為估計於不同曝光狀況下PQ/PMMA中PQ分子濃度;Estimation of PQ concentration in PQ/PMMA under exposure based on the absorption spectral properties
作者:	朱汀鈺;Chu, Ding-Yu
贡献者:	光電科學與工程學系
关键词:	吸收光譜行為;PQ/PMMA;PQ分子濃度;absorption spectral properties;PQ concentration;PQ/PMMA
日期:	2024-08-22
上传时间:	2024-10-09 15:45:27 (UTC+8)
出版者:	國立中央大學
摘要:	PQ/PMMA為具有潛力的全像光學儲存材料，並於各種光學元件中具有應用價值，具有高穩定性、低體積收縮率、易於製備和價格低廉等優點。其光化學反應機制涉及PQ分子對光子的吸收，從單重態轉變為三重態再與PMMA與MMA生成光產物。不論PQ/PMMA材料在全像光學儲存系統中的應用或是光學元件的應用PQ/PMMA材料的光化學反應造成PQ分子濃度的變化會影響實際應用的效果，因此，綜合過去的研究成果，本研究利用PQ/PMMA材料的吸收光譜行為，估計在不同曝光狀況下PQ分子濃度的變化，再透過連續曝光實驗以及連續曝光後停止曝光並持續觀察穿透光譜進一步了解PQ/PMMA的光化學反應機制，發現PQ/PMMA材料中約有92%至94%的PQ分子會迅速吸收光子轉變成3PQ並與反應物迅速發生反應生成PQ/PMMA分子，而其他的PQ分子會較慢與反應物發生反應，可能的原因為這部分的PQ分子周圍缺乏能夠進行反應的PMMA分子或官能基，因此，3PQ需要擴散至有反應物的區域才能與反應物發生反應成為產物，以此補充對PQ/PMMA光化學反應機制的說明，並藉由實驗中穿透光譜的行為算出位於波長360 nm到380 nm之反應截面，使其應用於估算PQ/PMMA樣品中之PQ濃度。;PQ/PMMA is a promising holographic optical storage material with various applications in optical devices, characterized by its high stability, low volume shrinkage, ease of preparation, and cost-effectiveness. The photochemical reaction mechanism involves PQ molecules absorbing photons, transitioning from singlet to triplet states, and reacting with PMMA and MMA to form photoproducts. Whether applied in holographic optical storage systems or optical devices, the photochemical reactions of PQ/PMMA materials, which cause changes in PQ molecule concentration, significantly affect practical applications. Therefore, building upon past research, this study estimates changes in PQ molecule concentration under different exposure conditions using the absorption spectra of PQ/PMMA materials. Continuous exposure experiments and continuous exposure experiments followed by cessation of exposure and ongoing observation of transmission spectra further elucidate the photochemical reaction mechanisms of PQ/PMMA. The study reveals that approximately 92% to 94% of PQ molecules in PQ/PMMA materials rapidly absorb photons, transition to 3PQ, and react swiftly with reactants to form PQ/PMMA molecules. The remaining PQ molecules react more slowly, possibly due to a scarcity of PMMA molecules or functional groups capable of reaction in their vicinity, requiring diffusion of 3PQ to regions with available reactants to form products. This explanation supplements the understanding of the photochemical reaction mechanism of PQ/PMMA. Additionally, the experimental behavior of transmission spectra within the wavelength range of 360 nm to 380 nm calculates the reaction cross-section, facilitating estimation of PQ concentration in PQ/PMMA samples.
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