Portal de Periódicos da CAPES

Re-examination of the Size-Dependent Absorption Properties of CdSe Quantum Dots

2009; American Chemical Society; Volume: 113; Issue: 45 Linguagem: Inglês

10.1021/jp906827m

1932-7455

Jacek J. Jasieniak, Lisa Smith, Joel van Embden, Paul Mulvaney, Marco Califano,

Copper-based nanomaterials and applications

We investigate the size-dependent optical absorption coefficients of CdSe nanocrystals at both the band-edge and high within the absorption profile. The absorption properties in both of these regions must be self-consistent to ensure accuracy of the measured coefficients. By combining transmission electron microscopy and inductively coupled plasma−optical emission spectroscopy, we map out the optical absorption properties and establish reliable size-dependent band-edge calibration curves. The measured absorption properties are compared to a simple 0D confinement model, to classical theory based on light absorption by small particles in a dielectric medium and to state-of-the-art atomistic semiempirical pseudopotential modeling. The applicability of these newly established calibration curves is demonstrated by analyzing the nucleation and growth kinetics of CdSe nanocrystals in solution.