BEGIN:VCALENDAR VERSION:2.0 PRODID:-//linuxsoftware.nz//NONSGML Joyous v1.4//EN BEGIN:VEVENT SUMMARY:Plasmonic Nanoparticles in Oxide Thin Films for Sensing Applicatio ns DTSTART:20251125T160000Z DTEND:20251125T180000Z DTSTAMP:20260725T132950Z UID:e2aa3611-580b-4ffc-823c-cdf999fb65e4 SEQUENCE:2 CREATED:20251121T094715Z DESCRIPTION:Oxide semiconductors such as Ga2O3\, ZnO\, and CuO are promisi ng materials for various applications due to their stability and tunable e lectronic properties. Incorporating plasmonic nanoparticles into these mat erials enhances their optical and electrical performance through localized surface plasmon resonance (LSPR). In this work\, Ag and Au nanoparticles were embedded into Ga2O3\, ZnO\, and CuO thin films to study their plasmon ic behaviour and evaluate their potential in temperature sensing and photo detection.The formation of metallic nanoparticles in Ga2O3 thin films by i on implantation was demonstrated for the first time\, as confirmed by opti cal and structural characterization. Plasmonic absorption bands appeared a t 400–600 nm for Ag and 500–700 nm for Au\, exhibiting red-shifts with increasing annealing temperature. Heavy ion irradiation revealed nanopart icle redistribution toward the surface and shape elongation.A comparative study of ZnO and CuO thin films with Au nanoparticles formed by ion implan tation and in situ growth was performed to investigate the temperature dep endence of the LSPR. Optical transmittance measurements showed a reversibl e red-shift of the LSPR peak with increasing temperature\, consistent with theoretical predictions.Finally\, photodetection tests revealed that\, un der visible light\, implanted Ga2O3 films displayed noticeable sub-bandgap photocurrents attributed to defect states rather than plasmonic effects. Au-ZnO demonstrated significantly enhanced photoresponses comparatively to its undoped film\, particularly under illumination resonant with the nano particles\, suggesting that plasmonic effects were involved. In contrast\, the inclusion of the nanoparticles in Au-CuO decreased its dark current\, as well as its responsivity. LAST-MODIFIED:20251121T094734Z LOCATION:Anfiteatro VA1 - Pavilhão de Civil do IST URL:http://df.vps.tecnico.ulisboa.pt/pt/eventos/plasmonic-nanoparticles-in -oxide-thin-films-for-sensing-applications/ X-ALT-DESC;FMTTYPE=text/html:

Oxide semiconductor s such as Ga2O3\, ZnO\, and CuO are promising materials for various applic ations due to their stability and tunable electronic properties. Incorpora ting plasmonic nanoparticles into these materials enhances their optical a nd electrical performance through localized surface plasmon resonance (LSP R). In this work\, Ag and Au nanoparticles were embedded into Ga2O3\, ZnO\ , and CuO thin films to study their plasmonic behaviour and evaluate their potential in temperature sensing and photodetection.

The formation of metallic nanoparticles in Ga2O3 thin films by ion implantation was demonstrated for the first time\, as confirmed by optical and structural characterization. Plasmonic absorption bands appear ed at 400–600 nm for Ag and 500–700 nm for Au\, exhibiting red-shifts with increasing annealing temperature. Heavy ion irradiation revealed nano particle redistribution toward the surface and shape elongation.

< p data-block-key="b8de4">A comparative study of ZnO and CuO thin films wit h Au nanoparticles formed by ion implantation and in situ growth wa s performed to investigate the temperature dependence of the LSPR. Optical transmittance measurements showed a reversible red-shift of the LSPR peak with increasing temperature\, consistent with theoretical predictions.

Finally\, photodetection tests revealed th at\, under visible light\, implanted Ga2O3 films displayed noticeable sub- bandgap photocurrents attributed to defect states rather than plasmonic ef fects. Au-ZnO demonstrated significantly enhanced photoresponses comparati vely to its undoped film\, particularly under illumination resonant with t he nanoparticles\, suggesting that plasmonic effects were involved. In con trast\, the inclusion of the nanoparticles in Au-CuO decreased its dark cu rrent\, as well as its responsivity.

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