TY - JOUR
T1 - Silicon nanocrystals in liquid media
T2 - optical properties and surface stabilization by microplasma-induced non-equilibrium liquid chemistry
AU - Mariotti, Davide
AU - Švrček, Vladimir
AU - Hamilton, Jeremy W. J.
AU - Schmidt, Michael
AU - Kondo, Michio
PY - 2012/3/7
Y1 - 2012/3/7
N2 - Surface engineering of silicon nanocrystals directly in water or ethanol by atmospheric-pressure dc microplasma is reported. In both liquids, microplasma processing stabilizes the optoelectronic properties of silicon nanocrystals. The microplasma treatment induces non-equilibrium liquid chemistry that passivates the silicon nanocrystals surface with oxygen-/organic-based terminations. In particular, the microplasma treatment in ethanol drastically enhances the silicon nanocrystals photoluminescence intensity and causes a clear red-shift (≈80 nm) of the photoluminescence maximum. The photoluminescence properties are stable after several days of storage in either ethanol or water. The surface chemistry induced by the microplasma treatment is analyzed and discussed.
AB - Surface engineering of silicon nanocrystals directly in water or ethanol by atmospheric-pressure dc microplasma is reported. In both liquids, microplasma processing stabilizes the optoelectronic properties of silicon nanocrystals. The microplasma treatment induces non-equilibrium liquid chemistry that passivates the silicon nanocrystals surface with oxygen-/organic-based terminations. In particular, the microplasma treatment in ethanol drastically enhances the silicon nanocrystals photoluminescence intensity and causes a clear red-shift (≈80 nm) of the photoluminescence maximum. The photoluminescence properties are stable after several days of storage in either ethanol or water. The surface chemistry induced by the microplasma treatment is analyzed and discussed.
KW - microplasma
KW - photoluminescence
KW - silicon quantum dots
U2 - 10.1002/adfm.201102120
DO - 10.1002/adfm.201102120
M3 - Article
AN - SCOPUS:84857843187
SN - 1616-301X
VL - 22
SP - 954
EP - 964
JO - Advanced Functional Materials
JF - Advanced Functional Materials
IS - 5
ER -