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:20260802T194559Z UID:e2aa3611-580b-4ffc-823c-cdf999fb65e4 SEQUENCE:1 CREATED:20251121T094705Z DESCRIPTION: Oxide semiconductors such as Ga2O3\, ZnO\, and CuO are promis ing materials for various applications due to their stability and tunable electronic properties. Incorporating plasmonic nanoparticles into these ma terials enhances their optical and electrical performance through localize d surface plasmon resonance (LSPR). In this work\, Ag and Au nanoparticles were embedded into Ga2O3\, ZnO\, and CuO thin films to study their plasmo nic behaviour and evaluate their potential in temperature sensing and phot odetection.The formation of metallic nanoparticles in Ga2O3 thin films by ion implantation was demonstrated for the first time\, as confirmed by opt ical and structural characterization. Plasmonic absorption bands appeared at 400–600 nm for Ag and 500–700 nm for Au\, exhibiting red-shifts wit h increasing annealing temperature. Heavy ion irradiation revealed nanopar ticle redistribution toward the surface and shape elongation.A comparative study of ZnO and CuO thin films with Au nanoparticles formed by ion impla ntation and in situ growth was performed to investigate the temperature de pendence of the LSPR. Optical transmittance measurements showed a reversib le red-shift of the LSPR peak with increasing temperature\, consistent wit h theoretical predictions.Finally\, photodetection tests revealed that\, u nder visible light\, implanted Ga2O3 films displayed noticeable sub-bandga p photocurrents attributed to defect states rather than plasmonic effects. Au-ZnO demonstrated significantly enhanced photoresponses comparatively t o its undoped film\, particularly under illumination resonant with the nan oparticles\, 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:20251121T094705Z LOCATION:Anfiteatro VA1 - Pavilhão de Civil do IST URL:http://df.vps.tecnico.ulisboa.pt/en/events/plasmonic-nanoparticles-in- oxide-thin-films-for-sensing-applications/ X-ALT-DESC;FMTTYPE=text/html:

Oxide semiconducto rs such as Ga2O3\, ZnO\, and CuO are promising materials for various appli cations due to their stability and tunable electronic properties. Incorpor ating plasmonic nanoparticles into these materials enhances their optical and electrical performance through localized surface plasmon resonance (LS PR). In this work\, Ag and Au nanoparticles were embedded into Ga2O3\, ZnO \, and CuO thin films to study their plasmonic behaviour and evaluate thei r 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 appea red at 400–600 nm for Ag and 500–700 nm for Au\, exhibiting red-shifts with increasing annealing temperature. Heavy ion irradiation revealed nan oparticle redistribution toward the surface and shape elongation.

A comparative study of ZnO and CuO thin films wi th Au nanoparticles formed by ion implantation and in situ growth w as performed to investigate the temperature dependence of the LSPR. Optica l transmittance measurements showed a reversible red-shift of the LSPR pea k with increasing temperature\, consistent with theoretical predictions.

Finally\, photodetection tests revealed t hat\, under visible light\, implanted Ga2O3 films displayed noticeable sub -bandgap photocurrents attributed to defect states rather than plasmonic e ffects. Au-ZnO demonstrated significantly enhanced photoresponses comparat ively to its undoped film\, particularly under illumination resonant with the nanoparticles\, suggesting that plasmonic effects were involved. In co ntrast\, the inclusion of the nanoparticles in Au-CuO decreased its dark c urrent\, as well as its responsivity.

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