TITLE:
Chemical Sensitivity of Luminescent Epitaxial Surface InP Quantum Dots
AUTHORS:
Roberta De Angelis, Mauro Casalboni, Ivan Colantoni, Liliana D’Amico, Fabio De Matteis, Fariba Hatami, William T. Masselink, Paolo Prosposito
KEYWORDS:
Vapour Sensitivity; Quantum Dot; Photoluminescence; InP; Organic Solvent
JOURNAL NAME:
Journal of Sensor Technology,
Vol.3 No.1,
March
27,
2013
ABSTRACT: Surface InP quantum dots grown by gas source molecular beam epitaxy on
In0.48Ga0.52P buffer layer lattice matched to GaAs
substrate shows a broad-band near-infrared photoluminescence ranging from 750 to 865 nm
dependent on their dimensions. A reversible luminescence intensity enhancement
has been observed when the quantum dots were exposed to vapours of different
chemical solvents with the highest sensitivity for alcohol (methanol and
ethanol) vapours. The luminescent behaviour is dependent on the solvent type
and concentration. The peak energy and band shape of the luminescence are not
affected by the solvent vapour.