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SeleniumRedox Reactivity on Colloidal CdSe Quantum Dot Surfaces

View Article: PubMed Central - PubMed

ABSTRACT

Understanding thestructural and compositional origins of midgapstates in semiconductor nanocrystals is a longstanding challenge innanoscience. Here, we report a broad variety of reagents useful forphotochemical reduction of colloidal CdSe quantum dots, and we establishthat these reactions proceed via a dark surface prereduction stepprior to photoexcitation. Mechanistic studies relying on the specificproperties of various reductants lead to the proposal that this surfaceprereduction occurs at oxidized surface selenium sites. These resultsdemonstrate the use of small-molecule inorganic chemistries to controlthe physical properties of colloidal QDs and provide microscopic insightsinto the identities and reactivities of their localized surface species.

No MeSH data available.


ProposedReduction of Surface Selenium Moieties upon Treatment withOrganometallic Reagents, Followed by Photodoping
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sch1: ProposedReduction of Surface Selenium Moieties upon Treatment withOrganometallic Reagents, Followed by Photodoping


SeleniumRedox Reactivity on Colloidal CdSe Quantum Dot Surfaces
ProposedReduction of Surface Selenium Moieties upon Treatment withOrganometallic Reagents, Followed by Photodoping
© Copyright Policy - editor-choice
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5016805&req=5

sch1: ProposedReduction of Surface Selenium Moieties upon Treatment withOrganometallic Reagents, Followed by Photodoping

View Article: PubMed Central - PubMed

ABSTRACT

Understanding thestructural and compositional origins of midgapstates in semiconductor nanocrystals is a longstanding challenge innanoscience. Here, we report a broad variety of reagents useful forphotochemical reduction of colloidal CdSe quantum dots, and we establishthat these reactions proceed via a dark surface prereduction stepprior to photoexcitation. Mechanistic studies relying on the specificproperties of various reductants lead to the proposal that this surfaceprereduction occurs at oxidized surface selenium sites. These resultsdemonstrate the use of small-molecule inorganic chemistries to controlthe physical properties of colloidal QDs and provide microscopic insightsinto the identities and reactivities of their localized surface species.

No MeSH data available.