Type

Journal Article

Authors

Clivia M. Sotomayor Torres
U. Woggon
O. Schöps
Z. Lopez
Guillermo Gonzalez
S. Ormazabal
Eglantina Benavente
María A. Santa-Ana
N. Mirabel
Vladimir Lavayen
and 1 others

Subjects

Chemistry

Topics
photoluminescence room temperature diffuse reflectance x ray diffraction scanning electron microscopy cadmium sulphide nanostructures optical properties

Surfactant-mediated variation of band-edge emission in CdS nanocomposites (2007)

Abstract The optical-structural characteristics of the direct optical band-gap semiconducting series of surfactant template-mediated laminar (CdS)x(CdCl2)y(CnH2n+4N)z nanocomposites are reported. X-ray diffraction measurements of the nanocomposites exhibited interlaminar distances in the range 2.9-3.6 nm with observations of eighth order {0 0 l} diffraction planes indicative of a high degree of laminarity and crystallographic order. Diffuse reflectance measurements have determined that the profile of their emission spectrum is that of a direct band-gap with absorption edges in the range 2.11-2.40 eV, depending on the CdS mole fraction in the nanocomposite. Photoluminescence (PL) excitation and time-resolved PL spectroscopies give an estimate of the maximum relative absorbance of the nanocomposites at ∼420 nm while the minimum was observed at ∼560 nm. The main emission was observed at ∼700 nm with emission from doubly ionized sulphur vacancies observed at ∼615 nm at room temperature. The CdS-containing nanocomposite is thus a surfactant-mediated modular system with variable band-gap energy emission.
Collections Ireland -> University College Cork -> College of Science, Engineering and Food Science
Ireland -> University College Cork -> Chemistry
Ireland -> University College Cork -> Chemistry - Journal Articles

Full list of authors on original publication

Clivia M. Sotomayor Torres, U. Woggon, O. Schöps, Z. Lopez, Guillermo Gonzalez, S. Ormazabal, Eglantina Benavente, María A. Santa-Ana, N. Mirabel, Vladimir Lavayen and 1 others

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