Boosting the nonlinear optical absorption of graphene oxide, and gold nanorods by tailoring graphene oxide-gold nanorods hybrids

Abstract

Tailoring efficient nonlinear optical materials continues to be a topic of great interest in the scientific field. In this paper, we study the nonlinear response of graphene oxide nanosheets GO, gold nanorods AuNRs, and graphene oxide/gold nanorods hybrid nanocomposite GO@AuNRs respectively, GO was prepared by modified Hummer method while AuNRs were prepared by the seed-mediated method and GO@AuNRs prepared by simple ex-situ method. The nonlinear absorption was measured via open aperture Z scan using nanosecond pulses at 532 nm, The nonlinear absorption coefficients were measured for the proposed materials in colloidal and polymeric forms. The results show an enhancement of the nonlinear absorption and optical limiting of GO@AuNRs over GO and AuNRs. Furthermore, enhanced optical nonlinearity and stability are achieved in polymeric form compared to colloidal forms. These materials could potentially be used in optical limiting applications and photonic devices.

Reducing the effective dose of cisplatin using cobalt modified silver nano-hybrid as a carriers on MCF7 and HCT cell models

“…In this work we have thought about the synthesis of CoNPs in water-based solution and the method was achieved by the reduction of the metal salt with strong reducing agent in the presence of a long chain surfactant PVA (poly vinyl alcohol) polymer of predetermined concentration to ensure the high colloidal stability, applicable in biological applications and also the method achieves the advantage of the simple and cheap chemistry [ 44 , 45 ]. The polar functional groups of the polymer are deducted to introduce a considerable hydrogen bonding between the surface of the CoNPs and the polymer chains and also may be responsible for the cross linking between the polymer chains as well.…”