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Stabilization and Large Nonlinearity of Gold Nanoparticles Functionalized with a π‐Conjugated Polymer
Author(s) -
Li Cuihong,
Jiang Li,
Liu Huibiao,
Li Yuliang,
Song Yinglin
Publication year - 2009
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.200900015
Subject(s) - conjugated system , colloidal gold , polymer , nanoparticle , nanotechnology , materials science , chemistry , chemical engineering , organic chemistry , engineering
Gold nanoparticles protected by a novel π‐conjugated polymer [poly( p ‐phenylene ethynylene) containing pendent disulfide and bipyridine groups] are synthesized and characterized. The polymer can stabilize the gold nanoparticles effectively. The nonlinear optical properties of the gold nanoparticle colloid solutions in toluene are investigated by using the Z‐scan technique at a wavelength of 532 nm and pulse width of 4 ns. The gold‐nanoparticle colloid solutions show an exceptional nonlinear absorption effect, which simultaneously contains the saturated absorption resulting from third‐order nonlinearity and a large reverse‐saturated absorption resulting from fifth‐order nonlinearity. In addition, asymmetric self‐focusing refractive effects are investigated in the colloid solutions.