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Enhanced photoluminescence of porous silicon nanoparticles coated by bioresorbable polymers
Authors:Maxim B Gongalsky  Alexander Yu Kharin  Liubov A Osminkina  Victor Yu Timoshenko  Jinyoung Jeong  Han Lee  Bong Hyun Chung
Affiliation:Physics Department, Lomonosov Moscow State University, Leninskie Gory 1, Moscow, 119991, Russia. timoshen@physics.msu.ru.
Abstract:A significant enhancement of the photoluminescence (PL) efficiency is observed for aqueous suspensions of porous silicon nanoparticles (PSiNPs) coated by bioresorbable polymers, i.e., polylactic-co-glycolic acid (PLGA) and polyvinyl alcohol (PVA). PSiNPs with average size about 100?nm prepared by mechanical grinding of electrochemically etched porous silicon were dispersed in water to prepare the stable suspension. The inner hydrophobic PLGA layer prevents the PSiNPs from the dissolution in water, while the outer PVA layer makes the PSiNPs hydrophilic. The PL quantum yield of PLGA/PVA-coated PSiNPs was found to increase by three times for 2?weeks of the storage in water. The observed effect is explained by taking into account both suppression of the dissolution of PSiNPs in water and a process of the passivation of nonradiative defects in PSiNPs. The obtained results are interesting in view of the potential applications of PSiNPs in bioimaging.
Keywords:Silicon nanoparticles  Porous silicon  Bioimaging  Polymer coating  Photoluminescence
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