Photophysical and electronic properties of Congo red dye embedded in polyvinyl alcohol as an efficient laser optical limiter: Enhancement the electrical conductivity and dielectric properties

Photophysical and electronic properties of Congo red dye embedded in polyvinyl alcohol as an efficient laser optical limiter: Enhancement the electrical conductivity and dielectric properties | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Research Article Photophysical and electronic properties of Congo red dye embedded in polyvinyl alcohol as an efficient laser optical limiter: Enhancement the electrical conductivity and dielectric properties Thekrayat AlAbdulaal, Mohamed. A. Assiri, M.I. Mohammed, H.Y. Zahran, and 4 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-1206241/v1 This work is licensed under a CC BY 4.0 License Status: Under Review Version 1 posted 5 You are reading this latest preprint version Abstract High-quality polymeric composite films containing Congo red dye and PVA were prepared using the casting technique. The proposed Cr-doped PVA composites were examined using XRD, UV–visible optical, dielectric, and optical limiting effect techniques. The XRD patterns of CR-doped PVA composite films display diffraction peaks, which belong to CR organic dye. There was a broadening and reduction of the initial peak intensity in polymer composite films at higher doping concentrations. The band edge of CR: PVA composites reduced with a massive shift from 4.63 eV to 1.86 e, where Congo red controls the energy bandgap of the PVA polymer. Dielectric permittivity diminishes with increasing the frequency and achieves constant values at higher frequencies through the relation between the electric dipole and the electric field differences. Increasing the percentage ratio of the CR doping enhances the electrical conductivity and dielectric permittivities due to the large size of the CR molecules. The strong optical limiting of the CR-doped PVA composites is determined using different laser sources of 632.8 and 532 nm wavelengths. The amazing obtained results imply that CR: PVA composite films are very significant for applying large-scale CUT-OFF laser filters for medical optical and electronic device systems. Congo red-doped PVA Polymeric composites films XRD Optical properties Dielectric properties Optical limiting Laser filters and Medical optics Full Text Cite Share Download PDF Status: Under Review Version 1 posted Reviews received at journal 21 Apr, 2022 Reviewers invited by journal 21 Apr, 2022 Editor invited by journal 14 Apr, 2022 Editor assigned by journal 12 Apr, 2022 First submitted to journal 09 Apr, 2022 You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. 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Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-1206241","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":100334715,"identity":"4da91889-5e5b-4aea-8a6c-120cca3f8510","order_by":0,"name":"Thekrayat AlAbdulaal","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAA7UlEQVRIiWNgGAWjYDCCAwxsIIKBn7354IMPFUARZuYGAlqYIVoke44lG844A9LCSKQWgxs5ZtK8bSAhAlr4bp8/9uDDmXvyYFtmzquN5m8HavlRsQ2nFslzyeyGM24UG/aD/PJx2/HcGYcZGxh7ztzGqcXgDDObNM+HBMaZYFu2HcttAGphZmwjoOXPhwT7DWC/zDmWO58oLQw3EhIhWhpqcjcQ0iJ5htlMsudMQjLYYTOOHcjdCNRyEJ9f+M4wPpP4cSzBFuz9DzV1ufPOHz744EcFbi3o4DCYPEC0eiCoI0XxKBgFo2AUjBAAAC6+aE0AlWB3AAAAAElFTkSuQmCC","orcid":"https://orcid.org/0000-0002-4478-9985","institution":"King Khalid University","correspondingAuthor":true,"prefix":"","firstName":"Thekrayat","middleName":"","lastName":"AlAbdulaal","suffix":""},{"id":100334716,"identity":"4cb50fa2-abc6-43fe-bc64-cdd656e28f5c","order_by":1,"name":"Mohamed. 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