Tailoring CO₂ gas sensing properties of V₂O₅ through polyaniline incorporation: A structural and optical study

Tailoring CO₂ gas sensing properties of V₂O₅ through polyaniline incorporation: A structural and optical study | 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 Tailoring CO₂ gas sensing properties of V₂O₅ through polyaniline incorporation: A structural and optical study Chetan Bhadane, Arun Patil This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-8840103/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract PANI–V₂O₅ nanocomposites with varying polyaniline (PANI) content (1–9 wt.%) were synthesized via a sol–gel method followed by mechanical mixing to investigate their structural, optical and gas sensing properties. X-ray diffraction confirmed the orthorhombic V₂O₅ phase with no impurity formation, while peak broadening and Williamson–Hall analysis revealed reduced crystallite size and increased microstrain with increasing PANI content, indicating strong interfacial interaction. FTIR spectroscopy verified the coexistence of characteristic vibrational modes of both PANI and V₂O₅, confirming successful composite formation. UV–Vis absorption studies and Tauc analysis showed a systematic reduction in optical band gap due to enhanced charge delocalization. Particle size analysis indicated nanoscale dimensions with improved dispersion at intermediate PANI loadings. Gas sensing studies demonstrated that the 7 wt.% PANI–V₂O₅ nanocomposite exhibited superior CO₂ sensing performance, attributed to optimized p–n heterojunction formation, enhanced surface activity, and efficient charge transfer. These findings highlight the potential of PANI–V₂O₅ nanocomposites for gas sensing applications. Vanadium pentoxide Polyaniline nanocomposites Sol–gel synthesis Structural characterization Optical properties Gas sensing Carbon dioxide detection Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Posted Version 1 posted 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. Our growing team is made up of researchers and industry professionals working together to solve the most critical problems facing scientific publishing. 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-8840103","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":599902390,"identity":"6a25e0ed-2ca2-4d0d-8624-6bcb1eea37cd","order_by":0,"name":"Chetan Bhadane","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAABEElEQVRIiWNgGAWjYDACCQiVYMDAAEQMNTz8YG4BXi2MDUhajslJwrjEamE2NjgAEsajhX928/EHP3cw5JmzH974uaCCLXHz+dWJHx4YMMjzix3AbsmdY4mNvWcYii170oqlZ5yRSdx24+1mCaClhjNnJ2DVYiCRY9jA28aQuOFAjoE0bxsbUMvZDSAtCQa3cWnJ/9j4F6Tl/Bvj37z/mBM3zzi7+Qd+LTmMzWBbbuSYSfM2AL3P37sNry0SN9IMZ8u2SRQb3HhWZs1z7JicxA3ebRYJBhI4/cI/I/nBx7dtNnkG55M33+apAUZl/9nNN39U2MjzS2PXArMMmZ2ALkIQ8B8gRfUoGAWjYBSMAAAAHf5jd0TQpwoAAAAASUVORK5CYII=","orcid":"","institution":"R. 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X-ray diffraction confirmed the orthorhombic V₂O₅ phase with no impurity formation, while peak broadening and Williamson\u0026ndash;Hall analysis revealed reduced crystallite size and increased microstrain with increasing PANI content, indicating strong interfacial interaction. FTIR spectroscopy verified the coexistence of characteristic vibrational modes of both PANI and V₂O₅, confirming successful composite formation. UV\u0026ndash;Vis absorption studies and Tauc analysis showed a systematic reduction in optical band gap due to enhanced charge delocalization. Particle size analysis indicated nanoscale dimensions with improved dispersion at intermediate PANI loadings. Gas sensing studies demonstrated that the 7 wt.% PANI\u0026ndash;V₂O₅ nanocomposite exhibited superior CO₂ sensing performance, attributed to optimized p\u0026ndash;n heterojunction formation, enhanced surface activity, and efficient charge transfer. 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