Laser created low detection limit tri_elements, AgNPs, AuNPs and MWCNT/Psi SERS sensors: Psi morphology dependence

Laser created low detection limit tri_elements, AgNPs, AuNPs and MWCNT/Psi SERS sensors: Psi morphology dependence | 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 Laser created low detection limit tri_elements, AgNPs, AuNPs and MWCNT/Psi SERS sensors: Psi morphology dependence Yara K. Waleed, Alwan M. Alwan, Allaa A. Jabbar This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-6753341/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 02 Aug, 2025 Read the published version in Plasmonics → Version 1 posted 7 You are reading this latest preprint version Abstract Two specific types of tri_elements, AgNPs, AuNPs and MWCNT/Psi SERS sensors were created and studied for qualitative detection of ultra-low concentrations of Chloropyrifos pesticides lower than the globally acceptable limit. The tri_elements, AgNPs, AuNPs and MWCNT have been incorporated on two varies types of Psi morphologies (pores and muds like structures) through an easy run and cheap ions reduction process. The pores and muds like structures were synthesized by Photo-electrochemical etching (PEE) process of silicon substrates of resistivity 10 and 100 ohm.cm respectively. The 10mW/cm 2 and 630nm laser power density and etching wavelength for a period of 20 min, was adopted in the etching process. The creation of tri-elements SERS sensors were created by integrating the AgNPs, AuNPs on the MWCNT/Psi substrate, by successive immersion of the PSi layer in 1 m M of AgNO 3 and HAuCl 4 solution for a 2 min respectively. The structural features of the pores and muds like structures substrates and tri-elements SERS sensors were explored by (FE-SEM), (XRD) and (EDS) measurements, whereas the SERS sensing properties were studied through Raman microscopy. The achieved results exposed that the surface morphology of Psi layer has effective impact on the sizes and the surface density of tri-elements nanoparticles. Advanced (EF) with lesser (LOD) of 1×10 5 and 10 − 10 M was achieved for muds like morphologies compared with that of pores like morphologies as a result of the superior specific surface area in addition to surface density of tri-elements nanoparticles. Qualitative pesticides detection SERS sensors Tri-elements nanoparticles Psi surface morphology Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Published Journal Publication published 02 Aug, 2025 Read the published version in Plasmonics → Version 1 posted Editorial decision: Revision requested 07 Jul, 2025 Reviews received at journal 23 Jun, 2025 Reviewers agreed at journal 17 Jun, 2025 Reviewers invited by journal 05 Jun, 2025 Editor assigned by journal 28 May, 2025 Submission checks completed at journal 28 May, 2025 First submitted to journal 26 May, 2025 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-6753341","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":467913730,"identity":"0076978c-e27a-429c-a21c-f3c4f7791cbf","order_by":0,"name":"Yara K. 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The tri_elements, AgNPs, AuNPs and MWCNT have been incorporated on two varies types of Psi morphologies (pores and muds like structures) through an easy run and cheap ions reduction process. The pores and muds like structures were synthesized by Photo-electrochemical etching (PEE) process of silicon substrates of resistivity 10 and 100 ohm.cm respectively. The 10mW/cm\u003csup\u003e2\u003c/sup\u003e and 630nm laser power density and etching wavelength for a period of 20 min, was adopted in the etching process. The creation of tri-elements SERS sensors were created by integrating the AgNPs, AuNPs on the MWCNT/Psi substrate, by successive immersion of the PSi layer in 1 m M of AgNO\u003csub\u003e3\u003c/sub\u003e and HAuCl\u003csub\u003e4\u003c/sub\u003e solution for a 2 min respectively. 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