Abstract: Compositions comprise a perovskite and a non-perovskite. Perovskites comprise AxA?yA?(1?x?y)BX3, and non-perovskites may comprise A?, B and X, where A is a first cation, A? is a second cation, A? is a third cation, B is a fourth cation, X is an anion. In some instances, A, A?, and A? are each independently (NH2)2CH+, CH3NH3+, Cs+, Rb+, or (NH2)2(C?NH2)+, with the proviso that A, A?, and A? are each different. The perovskite may have a first crystal structure in which the anion is corner-sharing, the non-perovskite may have a second crystal structure comprising at least one of an orthorhombic structure, a hexagonal structure, or a perovskite-like structure, and 1?x?y may be greater than about 0.15.

Abstract: Provided are nanowire-coated fibers and compositions comprising one or more nanowire-coated fibers and methods of making the fibers and compositions. The fibers can be organic or inorganic fibers. The nanowires can be metallic or semiconducting nanowires. The nanowires are disposed on at least a portion of a surface of a fiber or fibers. The fibers and compositions can be used as barcodes (e.g., for anti-counterfeiting methods). The fibers and compositions also can be used as photodetectors (e.g., methods of detecting electromagnetic radiation).

Abstract: Provided are nanowire-coated fibers and compositions comprising one or more nanowire-coated fibers and methods of making the fibers and compositions. The fibers can be organic or inorganic fibers. The nanowires can be metallic or semiconducting nanowires. The nanowires are disposed on at least a portion of a surface of a fiber or fibers. The fibers and compositions can be used as barcodes (e.g., for anti-counterfeiting methods). The fibers and compositions also can be used as photodetectors (e.g., methods of detecting electromagnetic radiation).

Abstract: The invention provides a method for assembling semiconducting nanowires, which method can include providing a mixture comprising a dielectric solvent and two or more semiconducting nanowires, wherein the semiconducting nanowires can be the same or different; exposing the mixture to an electrostatic charge under lighting conditions; and allowing macroscopic nanowire alignment to occur, wherein each nanowire is substantially oriented along the direction of the applied electric field.

Abstract: The invention provides a method for assembling semiconducting nanowires, which method can include providing a mixture comprising a dielectric solvent and two or more semiconducting nanowires, wherein the semiconducting nanowires can be the same or different; exposing the mixture to an electrostatic charge under lighting conditions; and allowing macroscopic nanowire alignment to occur, wherein each nanowire is substantially oriented along the direction of the applied electric field.