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Investigating the shape evolution mechanism of CdSe quantum dots by chemometrics analysis of spectrophotometry data
Hemmateenejad, B ; Sharif University of Technology | 2008
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- Type of Document: Article
- DOI: 10.1021/jp8018292
- Publisher: 2008
- Abstract:
- The study on the mechanism of the shape evolution of nanocrystaline particles is an important and emerging field, which is applicable in the shaped control synthesis of nanoparticles. As an alternative to transmittance electron microscopy (TEM), which is already used in the study of nanoparticles, in this article a simple spectrophotometric method has been proposed utilizing the advantages of chemometrics methods in analyzing overlapped and complex spectral data. The evolutionary visible absorbance data of CdSe quantum dots through particle formation were analyzed by factor analysis, evolving factor analysis, and multivariate curve resolution-alternative least-squares analysis, by which four chemical factors, attributed to the CdSe nanoparticles of different shapes, were detected and the concentration profiles and pure spectra of these particles were resolved. The interpretation of the evolution profiles of the detected nanocrystaline CdSe particles was easily achieved by using the existing shape evolution mechanism. The formation of magic size nanoclusters was detected at the beginning of the reaction, which was followed by the formation of rods and other elongated particles. At the end of the reaction, the formation of thermodynamically stable quantum dots nanoparticles was identified. © 2008 American Chemical Society
- Keywords:
- Cadmium alloys ; Cadmium compounds ; Nanoparticles ; Optical waveguides ; Quantum electronics ; Spectrophotometers ; Spectrophotometry ; Absorbance datums ; Cdse nano particles ; Cdse quantum dots ; Chemical factors ; Chemometrics ; Concentration profiles ; Control synthesis ; Elongated particles ; Evolving factor analyses ; Factor analysis ; Magic sizes ; Multivariate curve resolutions ; Particle formations ; Quantum dots ; Shape evolutions ; Spectral datums ; Spectrophotometric methods ; Transmittance electron microscopies ; Semiconductor quantum dots
- Source: Journal of Physical Chemistry C ; Volume 112, Issue 47 , 2008 , Pages 18321-18324 ; 19327447 (ISSN)
- URL: https://pubs.acs.org/doi/10.1021/jp8018292