Published December 2008
| Version v1
Journal article
pH-dependent aggregation and photoluminescence behavior of thiol-capped CdTe quantum dots in aqueous solutions
Creators
- 1. State Key Lab for Advanced Photonic Materials and Devices, Department of Optical Science and Engineering, Fudan University, Shanghai 200433 (China)
- 2. Department of Physics, Fudan University, Shanghai 200433 (China)
Description
pH-dependent aggregation of thiol-capped CdTe quantum dots (QDs) in solutions was observed with a confocal microscope. The average size of the QD aggregates increased from 28 nm to 1.4 μm as the pH decreased from 12 to 3. The basic condition improved the dispersion of QDs while the acidic condition caused the detachment of surface ligands, leading to the aggregation of QDs. A PL lifetime of 80 ns was detected for QDs at pH from 12 to 7, while it was shortened to 57 and 34 ns at pH 5 and 3, respectively, due to the formation of surface defects
Availability note (English)
Available from http://dx.doi.org/10.1016/j.jlumin.2008.06.004Additional details
Identifiers
- DOI
- 10.1016/j.jlumin.2008.06.004;
- PII
- S0022-2313(08)00170-1;
Publishing Information
- Journal Title
- Journal of Luminescence
- Journal Volume
- 128
- Journal Issue
- 12
- Journal Page Range
- p. 1948-1951
- ISSN
- 0022-2313
- CODEN
- JLUMA8
INIS
- Country of Publication
- Netherlands
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 40017054
- Subject category
- S36: MATERIALS SCIENCE;
- Descriptors DEI
- AGGLOMERATION; AQUEOUS SOLUTIONS; CADMIUM TELLURIDES; DEFECTS; LIGANDS; PH VALUE; PHOTOLUMINESCENCE; QUANTUM DOTS; SURFACES; THIOLS
- Descriptors DEC
- CADMIUM COMPOUNDS; CHALCOGENIDES; DISPERSIONS; EMISSION; HOMOGENEOUS MIXTURES; LUMINESCENCE; MIXTURES; NANOSTRUCTURES; ORGANIC COMPOUNDS; ORGANIC SULFUR COMPOUNDS; PHOTON EMISSION; SOLUTIONS; TELLURIDES; TELLURIUM COMPOUNDS
Optional Information
- Copyright
- Copyright (c) 2008 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.