Post-Treatment od Silicon Nanocrystals Produced by Ultra-Short Pulsed Laser Ablation in Liquid: Toward Blue Luminescent Nanocrystal Generation

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buir.contributor.authorOkyay, Ali Kemal
dc.citation.epage3436en_US
dc.citation.issueNumber5en_US
dc.citation.spage3432en_US
dc.citation.volumeNumber116en_US
dc.contributor.authorAlkis, S.en_US
dc.contributor.authorOkyay, Ali Kemalen_US
dc.contributor.authorOrtac, B.en_US
dc.date.accessioned2015-07-28T12:05:36Z
dc.date.available2015-07-28T12:05:36Z
dc.date.issued2012-01-11en_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.departmentInstitute of Materials Science and Nanotechnology (UNAM)en_US
dc.description.abstractBlue luminescent colloidal silicon nanocrystals (Si-NCs) were produced in a two-stage process. In the first step, synthesis of Si-NCs was achieved by femtosecond pulsed laser ablation of a silicon wafer, which was immersed in deionized water. The size and the structural and the chemical characteristics of colloidal Si-NCs were investigated by TEM and EDAX analyses, and it is found out that the Si-NCs are in spherical shape and the particle diameters are in the range of 5-100 nm. In the second step, ultrasonic waves and filtering chemical-free post-treatment of colloidal Si-NCs solution was performed to reduce the particle size. High-resolution TEM (HRTEM) studies on post-treated colloidal solution clearly show that small (1-5.5 nm in diameter) Si-NCs were successfully produced. Raman spectroscopy results clearly confirms the generation of Si nanoparticles in the crystalline nature, and the Raman scattering study of post-treated Si-NCs confirms the reduction of the particle size. The UV-vis absorption and photoluminescence (PL) spectroscopy studies elucidate the quantum confinement effect of Si-NCs on the optical properties. The colloidal Si-NCs and post-treated Si-NCs solutions present strong absorption edge shifts toward UV region. Broadband PL emission behavior is observed for the initial colloidal Si-NCs, and the PL spectrum of post-treated Si-NCs presents a blue-shifted broadband PL emission behavior due to the particle size reduction effect.en_US
dc.identifier.doi10.1021/jp211521ken_US
dc.identifier.issn1932-7447
dc.identifier.urihttp://hdl.handle.net/11693/13295
dc.language.isoEnglishen_US
dc.publisherAmerican Chemical Societyen_US
dc.relation.isversionofhttp://dx.doi.org/10.1021/jp211521ken_US
dc.source.titleJournal of Physical Chemistry Cen_US
dc.subjectAbsorption edgesen_US
dc.subjectBlue-shifteden_US
dc.subjectChemical characteristicen_US
dc.subjectColloidal solutionsen_US
dc.subjectCrystalline natureen_US
dc.subjectFemtosecond pulsed laser ablationen_US
dc.subjectHigh-resolution temen_US
dc.subjectLuminescent nanocrystalsen_US
dc.subjectParticle diametersen_US
dc.subjectParticle size reductionen_US
dc.subjectPl emissionen_US
dc.subjectPl spectraen_US
dc.subjectPost treatmenten_US
dc.subjectQuantum confinement effectsen_US
dc.subjectSi nanoparticlesen_US
dc.subjectSilicon nanocrystalsen_US
dc.subjectSpherical shapeen_US
dc.subjectTwo-stage processen_US
dc.subjectUv regionen_US
dc.subjectUv-vis absorptionsen_US
dc.titlePost-Treatment od Silicon Nanocrystals Produced by Ultra-Short Pulsed Laser Ablation in Liquid: Toward Blue Luminescent Nanocrystal Generationen_US
dc.typeArticleen_US
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Department of Electrical and Electronics Engineering
Institute of Materials Science and Nanotechnology (UNAM)