Details
| Original language | English |
|---|---|
| Article number | 490 |
| Pages (from-to) | 1-10 |
| Number of pages | 10 |
| Journal | Journal of nanoparticle research |
| Volume | 17 |
| Issue number | 490 |
| Publication status | Published - 19 Dec 2015 |
| Externally published | Yes |
Abstract
A simple liquid-phase laser fragmentation approach, resulting in the rapid transformation of CdSe microcrystals into colloidal quantum dots (QDs), is presented. Laser fragmentation is achieved by irradiating a CdSe suspension in dimethylformamide with intense infrared, picosecond laser pulses followed by surface passivation with oleylamine or different types of phosphines. The generated QDs reveal perfect colloidal stability preventing agglomeration and precipitation, and show characteristic QD absorption and fluorescence characteristics, whereas their emission properties strongly depend on the surface states and applied capping ligands. These QDs show distinct photoemission under 405-nm single-photon and 800-nm multi-photon excitations in the 560- to 610-nm spectral region corresponding to the QDs size of about 1.5–2 nm in diameter which is confirmed by transmission electron microscopy.
Keywords
- Cadmium selenide, Colloids, Fluorescence, Laser fragmentation, Nanoparticles, Optical properties, Quantum dots
ASJC Scopus subject areas
- Chemical Engineering(all)
- Bioengineering
- Chemistry(all)
- General Chemistry
- Physics and Astronomy(all)
- Atomic and Molecular Physics, and Optics
- Mathematics(all)
- Modelling and Simulation
- Materials Science(all)
- General Materials Science
- Physics and Astronomy(all)
- Condensed Matter Physics
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In: Journal of nanoparticle research, Vol. 17, No. 490, 490, 19.12.2015, p. 1-10.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Generation of fluorescent CdSe nanocrystals by short-pulse laser fragmentation
AU - Zholudov, Yu T.
AU - Sajti, C. L.
AU - Slipchenko, N. N.
AU - Chichkov, B. N.
N1 - Funding information: This work was conducted in the framework of German Academic Exchange Service grant A/14/02402. Additionally, the authors received financial support from the Deutsche Forschungsgemeinschaft within the excellence cluster REBRITH (Exc62/1), and the Collaborative Research Center/Transregio 123 “Planar Optronic Systems.” The authors would like to acknowledge Torben Kodanek and Andreas Wolf from the Laboratory of Nano and Quantum Engineering in Hannover for TEM and the excitation spectra measurements, respectively.
PY - 2015/12/19
Y1 - 2015/12/19
N2 - A simple liquid-phase laser fragmentation approach, resulting in the rapid transformation of CdSe microcrystals into colloidal quantum dots (QDs), is presented. Laser fragmentation is achieved by irradiating a CdSe suspension in dimethylformamide with intense infrared, picosecond laser pulses followed by surface passivation with oleylamine or different types of phosphines. The generated QDs reveal perfect colloidal stability preventing agglomeration and precipitation, and show characteristic QD absorption and fluorescence characteristics, whereas their emission properties strongly depend on the surface states and applied capping ligands. These QDs show distinct photoemission under 405-nm single-photon and 800-nm multi-photon excitations in the 560- to 610-nm spectral region corresponding to the QDs size of about 1.5–2 nm in diameter which is confirmed by transmission electron microscopy.
AB - A simple liquid-phase laser fragmentation approach, resulting in the rapid transformation of CdSe microcrystals into colloidal quantum dots (QDs), is presented. Laser fragmentation is achieved by irradiating a CdSe suspension in dimethylformamide with intense infrared, picosecond laser pulses followed by surface passivation with oleylamine or different types of phosphines. The generated QDs reveal perfect colloidal stability preventing agglomeration and precipitation, and show characteristic QD absorption and fluorescence characteristics, whereas their emission properties strongly depend on the surface states and applied capping ligands. These QDs show distinct photoemission under 405-nm single-photon and 800-nm multi-photon excitations in the 560- to 610-nm spectral region corresponding to the QDs size of about 1.5–2 nm in diameter which is confirmed by transmission electron microscopy.
KW - Cadmium selenide
KW - Colloids
KW - Fluorescence
KW - Laser fragmentation
KW - Nanoparticles
KW - Optical properties
KW - Quantum dots
UR - http://www.scopus.com/inward/record.url?scp=84950311060&partnerID=8YFLogxK
U2 - 10.1007/s11051-015-3303-z
DO - 10.1007/s11051-015-3303-z
M3 - Article
AN - SCOPUS:84950311060
VL - 17
SP - 1
EP - 10
JO - Journal of nanoparticle research
JF - Journal of nanoparticle research
SN - 1388-0764
IS - 490
M1 - 490
ER -