Flexible,robust and highly efficient broadband nonlinear optical materials based on graphene oxide impregnated polymer sheets

We report a simple solution-processed method for the fabrication of low-cost,flexible optical limiting materials based on graphene oxide(GO) impregnated polyvinyl alcohol(PVA) sheets.Such GO–PVA composite sheets display highly efficient broadband optical limiting activities for femtosecond laser pulses at 400,800,and 1400 nm with very low limiting thresholds.Femtosecond pump–probe measurement results revealed that nonlinear absorption played an important role for the observed optical limiting activities.High flexibility and efficient optical limiting activities of these materials allow these composite sheets to be attached to nonplanar optical sensors in order to protect them from light-induced damage.

Pressure-induced polymerization of butyndioic acid and its Li^＋ salt

Conductive organic polymers with carbonyl groups are considered as potential cathode materials of the Li^＋ battery. Driven by extremely high pressure, 2-butyndioic acid and its Li~＋ salt polymerize at around 4 and 10 GPa, respectively, which demonstrates that pressure-induced polymerization is a robust method for synthesizing substituted polyacetylene-like conductors.