Development of photoluminescent artificial nacre-like nanocomposite from polyester resin and graphene oxide.

Long-lasting phosphorescent nacre-like material was simply prepared from a nanocomposite of inorganic and organic materials. Low molecular weight unsaturated polyester (PET), graphene oxide (GO), and nanoparticles of rare-earth activated aluminate pigment were used in the preparation process of an organic/inorganic hybrid nanocomposite. Using methylethylketone peroxide (MEKP) as a hardener, we were able to develop a fluid solution that hardens within minutes at room temperature. Covalent and hydrogen bonds were introduced between the polyester resin and graphene oxide nanosheets. The interface interactions of those bonds resulted in toughness, excellent tensile strength, and high durability. The produced nacre substrates demonstrated long-persistent and reversible luminescence. The excitation of the produced nacre substrates at 365 nm resulted in a 524 nm emission. After being exposed to UV light, the photoluminescent nacre substrates became green. The increased superhydrophobic activity of the produced nacre substrates was achieved without affecting their physico-mechanical properties. HIGHLIGHTS: Colorless photoluminescent smart nacre-like nanocomposites were prepared. Graphene oxide and polyester were mixed with phosphor nanoparticles at 25°C. Photostable long-persistent phosphorescence lighting was observed in the dark. Photochromic change to green emission was detected under ultraviolet light. The nacre-like composites exhibit improved hardness and hydrophobicity.