Stabilization and Large Nonlinearity of Gold Nanoparticles Functionalized with a π‐Conjugated Polymer

Abstract

Gold nanoparticles protected by a novel pi-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.

Construction of heterostructure materials toward functionality

“…The combination of conjugated organic chromophores and AuNPs produces new classes of organic/inorganic nanomaterials. Recently, the third-order optical nonlinear effects of AuNPs capped with conjugated small organic molecules 69 and polymers 70 were investigated. Open-aperture Z-scans of AuNPs capped with BPCP (Fig.…”

A dual sensor of fluorescent and colorimetric for the rapid detection of lead

“…Many synthesis methods of nanoparticles have been developed in recent years, in an effort to produce structures that have a specific form and function relevant to a given application. Gold nanoparticles possess many interesting chemical and physical properties, [1][2][3][4] which have been used for the fabrication and miniaturization of optical devices, 5-8 sensors [9][10][11][12][13][14][15] and photonic circuits 16 as well as in medical diagnostics and therapeutics. 17 The extremely high extinction coefficients (10 8 -10 10 M À1 cm À1 ) in the visible wavelength range and the strong distance-dependent optical properties of gold nanoparticles promote them to be used as ideal colour reporting groups for colorimetric sensors.…”

Polydentate disulfides for enhanced stability of AuNPs and facile nanocavity formation

“…Further, the particle size obtained from DLS measurement is biased towards larger particle size. 30,31 Interestingly the nanocapsule size remains unchanged after etching (ESI Fig. S13 †).…”