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Synthesis of Size-Selected, Surface-Passivated InP Nanocrystals
Abstract
Quantum-confined InP nanocrystals from 20 to 50 Å in diameter have been synthesized via the reaction of InCl 3 and P(Si(CH 3 ) 3 ) 3 in trioctylphosphine oxide (TOPO) at elevated temperatures. The nanocrystals are highly crystalline, monodisperse, and soluble in various organic solvents. Improved size distributions have been obtained by size-selectively reprecipitating the nanocrystals. The UV/vis absorption spectra of the particles show the characteristic blue shift of the band gap of up to 1 eV due to quantum confinement, a moderately well-resolved first excitonic excited state, and, in some cases, the resolution of a higher excited state. Structurally, the nanocrystals are characterized with powder X-ray diffraction and transmission electron microscopy. Raman spectroscopy reveals TO and LO modes near the characteristic bulk InP positions as well a surface mode resulting from finite size. The Raman line widths, line positions, and relative intensities are all size-dependent . X-ray photoelectron spectroscopy (XPS) shows the nanocrystals have a nearly stoichiometric ratio of indium to phosphorus with TOPO surface coverages ranging from 30% to 100%. We have also used XPS to correlate the oxidation of the nanocrystal surface with photoluminescence intensity. Photoluminescence is observed as both band edge and deep trap emission with both features shifting with nanocrystal size. The luminescence is highly dependent on the surface of the nanocrystal with oxidation being a necessary condition for emission.
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Citations
Cited by
Synthesis and Characterization of Monodisperse Nanocrystals and Close-Packed Nanocrystal Assemblies
Murray, C. B., Kagan, C. R., & Bawendi, M. G. (2000) · Annual Review of Materials Science · doi:10.1146/annurev.matsci.30.1.545 · Cited by 4,353
Perspectives on the Physical Chemistry of Semiconductor Nanocrystals
Alivisatos, A. P. (1996) · The Journal of Physical Chemistry · doi:10.1021/jp9535506 · Cited by 3,595
Self-citationPeng, X., Wickham, J., & Alivisatos, A. P. (1998) · Journal of the American Chemical Society · doi:10.1021/ja9805425 · Cited by 1,895
Self-citationQuantum Dots and Their Multimodal Applications: A Review
Bera, D., Qian, L., Tseng, T.-K., & Holloway, P. H. (2010) · Materials · doi:10.3390/ma3042260 · Cited by 1,365
Borchert, H., Shevchenko, E. V., Robert, A., Mekis, I., Kornowski, A., Grübel, G., & Weller, H. (2005) · Langmuir · doi:10.1021/la0477183 · Cited by 721
Size-dependent band gap of colloidal quantum dots
Baskoutas, S., & Terzis, A. F. (2006) · Journal of Applied Physics · doi:10.1063/1.2158502 · Cited by 384
Surface Ligand Dynamics in Growth of Nanocrystals
Pradhan, N., Reifsnyder, D., Xie, R., Aldana, J., & Peng, X. (2007) · Journal of the American Chemical Society · doi:10.1021/ja0725089 · Cited by 317
Metadata
- Authors
- Guzelian, A. A., Katari, J. E. B., Kadavanich, A. V., Banin, U., Hamad, K., Juban, E., Alivisatos, A. P., Wolters, R. H., Arnold, C. C., & Heath, J. R.
- Venue
- The Journal of Physical Chemistry
- Publisher
- American Chemical Society (ACS)
- Published
- 1996-01-01
- Volume
- 100
- Issue
- 17
- Pages
- 7212-7219
- ISSN
- 0022-3654 (ISSN-L)
- 1541-5740
- OpenAlex
- W2046756243
- Cited by
- 520
- References
- 0
- FWCI
- 17.90
- Type
- journal article
- Language
- en
- Open access
- closed
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