Separating fluorescent species of aqueous PbS semiconductor nanocrystals using micro-emulsions
Colloidal PbS nanocrystals over-coated with CdS are prepared in aqueous solutions and exhibit strong photoluminescence with two distinct peaks in the visible regime. A photoluminescence peak is observed at 640 nm, which is attributed to the band edge recombination in the PbS nanocrystals, and anothe...
| Main Authors: | , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
2005
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| _version_ | 1797050276753965056 |
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| author | Warner, J Watt, A Fernee, M Heckenberg, N Rubinsztein-Dunlop, H |
| author_facet | Warner, J Watt, A Fernee, M Heckenberg, N Rubinsztein-Dunlop, H |
| author_sort | Warner, J |
| collection | OXFORD |
| description | Colloidal PbS nanocrystals over-coated with CdS are prepared in aqueous solutions and exhibit strong photoluminescence with two distinct peaks in the visible regime. A photoluminescence peak is observed at 640 nm, which is attributed to the band edge recombination in the PbS nanocrystals, and another peak at 510 nm, which is above the band edge of the PbS nanocrystals. The two PL peaks are isolated by extracting separate species of nanocrystal based upon their surface morphology. Micro-emulsions of hexane:PVA are used to remove the species containing the PL peak at 640 nm from the solution, leaving a singular peak at 510 nm. We show conclusively that the double-peaked structure observed in the photoluminescence spectra of PbS nanocrystals over-coated with CdS is due to the presence of two distinctly different nanocrystal species. © 2005 IOP Publishing Ltd. |
| first_indexed | 2024-03-06T18:02:47Z |
| format | Journal article |
| id | oxford-uuid:00641daa-b016-4e1e-af54-58a33e647f46 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T18:02:47Z |
| publishDate | 2005 |
| record_format | dspace |
| spelling | oxford-uuid:00641daa-b016-4e1e-af54-58a33e647f462022-03-26T08:29:12ZSeparating fluorescent species of aqueous PbS semiconductor nanocrystals using micro-emulsionsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:00641daa-b016-4e1e-af54-58a33e647f46EnglishSymplectic Elements at Oxford2005Warner, JWatt, AFernee, MHeckenberg, NRubinsztein-Dunlop, HColloidal PbS nanocrystals over-coated with CdS are prepared in aqueous solutions and exhibit strong photoluminescence with two distinct peaks in the visible regime. A photoluminescence peak is observed at 640 nm, which is attributed to the band edge recombination in the PbS nanocrystals, and another peak at 510 nm, which is above the band edge of the PbS nanocrystals. The two PL peaks are isolated by extracting separate species of nanocrystal based upon their surface morphology. Micro-emulsions of hexane:PVA are used to remove the species containing the PL peak at 640 nm from the solution, leaving a singular peak at 510 nm. We show conclusively that the double-peaked structure observed in the photoluminescence spectra of PbS nanocrystals over-coated with CdS is due to the presence of two distinctly different nanocrystal species. © 2005 IOP Publishing Ltd. |
| spellingShingle | Warner, J Watt, A Fernee, M Heckenberg, N Rubinsztein-Dunlop, H Separating fluorescent species of aqueous PbS semiconductor nanocrystals using micro-emulsions |
| title | Separating fluorescent species of aqueous PbS semiconductor nanocrystals using micro-emulsions |
| title_full | Separating fluorescent species of aqueous PbS semiconductor nanocrystals using micro-emulsions |
| title_fullStr | Separating fluorescent species of aqueous PbS semiconductor nanocrystals using micro-emulsions |
| title_full_unstemmed | Separating fluorescent species of aqueous PbS semiconductor nanocrystals using micro-emulsions |
| title_short | Separating fluorescent species of aqueous PbS semiconductor nanocrystals using micro-emulsions |
| title_sort | separating fluorescent species of aqueous pbs semiconductor nanocrystals using micro emulsions |
| work_keys_str_mv | AT warnerj separatingfluorescentspeciesofaqueouspbssemiconductornanocrystalsusingmicroemulsions AT watta separatingfluorescentspeciesofaqueouspbssemiconductornanocrystalsusingmicroemulsions AT ferneem separatingfluorescentspeciesofaqueouspbssemiconductornanocrystalsusingmicroemulsions AT heckenbergn separatingfluorescentspeciesofaqueouspbssemiconductornanocrystalsusingmicroemulsions AT rubinszteindunloph separatingfluorescentspeciesofaqueouspbssemiconductornanocrystalsusingmicroemulsions |