Enhanced photoluminescence of porous silicon nanoparticles coated by bioresorbable polymers = 생분해성 고분자로 코팅한 실리콘 나노입자의 형광 증가

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Title
Enhanced photoluminescence of porous silicon nanoparticles coated by bioresorbable polymers = 생분해성 고분자로 코팅한 실리콘 나노입자의 형광 증가
Author(s)
M B Gongalsky; A Y Kharin; L A Osminkina; V U Timoshenko; Jin Young Jeong; Han Lee; Bong Hyun Chung
Bibliographic Citation
Nanoscale Research Letters, vol. 7, no. 1, pp. 446-446
Publication Year
2012
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.
Keyword
BioimagingPhotoluminescencePolymer coatingPorous siliconSilicon nanoparticles
ISSN
1931-7573
Publisher
Springer
DOI
http://dx.doi.org/10.1186/1556-276X-7-446
Type
Article
Appears in Collections:
Division of Research on National Challenges > Environmental diseases research center > 1. Journal Articles
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