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Size and Temperature Dependent Phonon Spectra of Spherical CdSe Quantum Dots Prepared via a Refined Phosphonic Acid Assisted Organometallic Route

[+] Author Affiliations
Liangliang Chen, Yiwen Chen, Xiulin Ruan

Purdue University, West Lafayette, IN

Paper No. IMECE2011-64562, pp. 1743-1749; 7 pages
doi:10.1115/IMECE2011-64562
From:
  • ASME 2011 International Mechanical Engineering Congress and Exposition
  • Volume 4: Energy Systems Analysis, Thermodynamics and Sustainability; Combustion Science and Engineering; Nanoengineering for Energy, Parts A and B
  • Denver, Colorado, USA, November 11–17, 2011
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5490-7
  • Copyright © 2011 by ASME

abstract

Spherical CdSe quantum dots (QDs) with a narrow size distribution were synthesized using a refined phosphonic-acid-assisted organometallic route. Visible absorption spectra show that as reaction time increases the absorption peak will shift to longer wavelength. HRTEM image confirmed the high-crystallinity of the as-prepared QDs. Raman spectroscopy was used to investigate the size and temperature dependence of the phonon spectra. As temperature increases, the LO-phonon frequency will decrease and the bandwidth will increase. As size increases, the LO-phonon frequency will increase and the bandwidth will decrease. However, when the temperature is above 400 K, the LO-phonon frequency in the smaller dots is higher than that in the larger dots due to the weaker negative temperature dependence of the LO-phonon frequency in the smaller dots.

Copyright © 2011 by ASME

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