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Control of optical absorption and fluorescence spectroscopies of natural melanin at different solution concentrations

机译：控制不同浓度溶液中天然黑色素的光吸收和荧光光谱

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摘要

The source of the optical properties of natural melanin persists as an impressive conundrum, hindering a thorough comprehension of the complicated photo-protective contribution of these extensive natural pigments and the pragmatic design of revolutionary bioinspired materials for optoelectronic functionalities. Melanin is a natural pigment distributed in vivo, and provides protection from the sun rays, exhibiting a strong wide-band UV-visible absorption. In the present study, we investigated the optical properties of natural melanin at different pH concentrations within the framework of experimental techniques, namely, UV-visible absorption, Fourier transform infrared spectroscopy (FTIR), and fluorescence spectroscopies. The results indicate that the optical absorption and fluorescence of natural melanin are enhanced within the near-UV and visible regimes with an increase in the solution concentration, are dependent on the pH level, and can impact the emergence of a broad band of visible absorption. The variations in the optical absorption spectra of natural melanin solutions at various pH levels will demonstrate novel rational strategies for controlling their optical properties for potential optoelectronic applications.
机译：天然黑色素的光学性质来源仍然是一个令人印象深刻的难题，这阻碍了对这些广泛的天然色素的复杂光保护作用的全面理解以及革命性的具有生物启发性的光电功能材料的实用设计。黑色素是一种分布在体内的天然色素，可抵御阳光，具有很强的宽带紫外线可见吸收性。在本研究中，我们在实验技术的框架内，即紫外线-可见吸收，傅里叶变换红外光谱（FTIR）和荧光光谱学中，研究了天然黑色素在不同pH浓度下的光学性质。结果表明，随着溶液浓度的增加，天然黑色素的光吸收和荧光在近紫外线和可见光条件下得到增强，取决于pH值，并且可以影响宽范围可见光吸收的出现。天然黑色素溶液在各种pH值下的光吸收光谱的变化将证明控制潜在光学应用的光学性能的新颖合理策略。

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  • 来源
    《Optical and quantum electronics》 |2019年第7期|227.1-227.13|共13页
  • 作者

    Madkhali Nawal; Alqahtani Hadi. R.; Al-Terary Seham; Laref Amel; Hassib Adel;

  • 作者单位

    Al Imam Mohammad Ibn Saud Islamic Univ IMISU, Dept Phys, Coll Sci, POB 90950, Riyadh 11623, Saudi Arabia|King Saud Univ, Phys & Astron Dept, Coll Sci, POB 2455, Riyadh 11451, Saudi Arabia;

    King Saud Univ, Phys & Astron Dept, Coll Sci, POB 2455, Riyadh 11451, Saudi Arabia;

    King Saud Univ, Chem Dept, Coll Sci, POB 2455, Riyadh 11451, Saudi Arabia;

    King Saud Univ, Phys & Astron Dept, Coll Sci, POB 2455, Riyadh 11451, Saudi Arabia;

    King Saud Univ, Phys & Astron Dept, Coll Sci, POB 2455, Riyadh 11451, Saudi Arabia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Fluorescence of natural melanin; Oligomer systems; UV-visible absorption;

    机译：天然黑色素的荧光;低聚物系统;UV可见的吸收;

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