Nonlinear photoluminescence imaging of isotropic and liquid crystalline dispersions of graphene oxide.
ACS Nano
; 6(9): 8060-6, 2012 Sep 25.
Article
de En
| MEDLINE
| ID: mdl-22881340
ABSTRACT
We report a visible-range nonlinear photoluminescence (PL) from graphene oxide (GO) flakes excited by near-infrared femtosecond laser light. PL intensity has nonlinear dependence on the laser power, implying a multiphoton excitation process, and also strongly depends on a linear polarization orientation of excitation light, being at maximum when it is parallel to flakes. We show that PL can be used for a fully three-dimensional label-free imaging of isotropic, nematic, and lamellar liquid crystalline dispersions of GO flakes in water. This nonlinear PL is of interest for applications in direct label-free imaging of composite materials and study of orientational ordering in mesomorphic phases formed by these flakes, as well as in biomedical and sensing applications utilizing GO.
Recherche sur Google
Collection:
01-internacional
Base de données:
MEDLINE
Sujet principal:
Nanostructures
/
Cristaux liquides
/
Graphite
/
Lasers
/
Mesures de luminescence
Langue:
En
Journal:
ACS Nano
Année:
2012
Type de document:
Article
Pays d'affiliation:
États-Unis d'Amérique
Pays de publication:
EEUU
/
ESTADOS UNIDOS
/
ESTADOS UNIDOS DA AMERICA
/
EUA
/
UNITED STATES
/
UNITED STATES OF AMERICA
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US
/
USA