Size analysis of CdSe/ZnS quantum dots in aqueous solution by using laser-induced breakdown detection

Ji Woong Kim, Jason J. Han, Joong Gill Choi, Dae Kyu Kim, Koo Chul Je, Seung Han Park, Jong Il Yun, Thomas Fanghänel

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

CdSe/ZnS quantum dots (QDs) coated with mercaptoacetic acid (MAA) in an anqueous solution are investigated by means of highly sensitive laser-induced breakdown detection (LIBD). In particular, a size distribution analysis of QDs dispersed in ultra pure water is performed as a function of time until a steady state is reached. Freshly prepared CdSe/ZnS-MAA QDs are found to initially exist as relatively large (25.0 × 1.2 nm) agglomerates that slowly disperse over days to small (6.5 × 0.2 nm), but stable, single particles. These results of increasing breakdown probability with increasing particle density amply demonstrate that LIBD can be a promising analytical technique for size analysis of nanoparticle formation and stability.

Original languageEnglish
Pages (from-to)135-138
Number of pages4
JournalJournal of the Korean Physical Society
Volume49
Issue number1
Publication statusPublished - 2006 Jul 1

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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