Enhanced photoluminescence of porous silicon nanoparticles coated by bioresorbable polymersстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:A significant enhancement of the photoluminescence (PL) efficiency is observed for aqueous suspensions of porous silicon nanoparticles (PSiNPs) coated by bioresorable polymers, i.e. polylactic-co-glycolic acid (PLGA) and polyvinil 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 3 times for 2 weeks of the storage in water. The observed effect is xplained by taking into account both suppression of the dissolution of PSiNPs in water and a process of the passivation of onradiative defects in PSINPs. The obtained results are interesting in view of the applications of PSiNPs in bioimaging.