2D materials have attracted great interest in a variety of applications due to materials' anisotropy, chemical reactivity and thicknessdependent properties. Among them, black phosphorus (BP) has recently gained great attention due to its unique electronic and optical properties. The size depended band gap can vary from 0.3 eV for bulk BP to 2 eV for the single layer, namely phosphorene, prepared by exfoliation of BP. This form, which structurally resembles graphene, represents an intriguing material for electronic and optical applications and as replacement for semiconductors in computer circuits. However, the high water and air sensitivity represent a great drawback for its widespread use. Several strategies on exfoliation and coating procedures to improve its stabilization aganist oxidation have been developed while few works deal on chemical reactivity and functionalization processes. A covalent C- P bind has been formed between aryl diazonium salts and phosphorene 3 and non- covalent interactions have been found to occur with aromatic compounds. Here we report on a functionalization study of phosphorene by organic luminescent dyes based on pyrene core, bearing boronic functionalities. Pyrene 1- boronic acid (PBA), 4,4,5,5- tetramethyl- 2-pyren-1-yl-1,3,2- dioxaborolane (PBE) and pyrene (PY) have been examined. Spectroscopic investigations have showed a change of time resolved properties of the chromophores, i. e. the increase of fluorescence lifetime and of rotational correlation time, thus indicating the occurrence of an interaction between pyrenes and phosphorene. This work provides new insights on chemical properties of phosphorene, opening the way to a new functionalization strategy of the material by organic luminescent dyes. For example, due to the excellent optical response of pyrene, surface analysis of the material can be carried out, i. e. identification of superficial defects whose determination is important for the use of phosphorene in electronic devices.
Functionalization of phosphorene by pyrene based chromophores
Mariachiara Trapani;Margherita Bolognesi;Salvatore Moschetto;Federico Prescimone;Claudia Ferroni;Maria Caporali;Michele Muccini;Manuel Serrano Ruiz;Maurizio Peruzzini;Stefano Toffanin;
2018
Abstract
2D materials have attracted great interest in a variety of applications due to materials' anisotropy, chemical reactivity and thicknessdependent properties. Among them, black phosphorus (BP) has recently gained great attention due to its unique electronic and optical properties. The size depended band gap can vary from 0.3 eV for bulk BP to 2 eV for the single layer, namely phosphorene, prepared by exfoliation of BP. This form, which structurally resembles graphene, represents an intriguing material for electronic and optical applications and as replacement for semiconductors in computer circuits. However, the high water and air sensitivity represent a great drawback for its widespread use. Several strategies on exfoliation and coating procedures to improve its stabilization aganist oxidation have been developed while few works deal on chemical reactivity and functionalization processes. A covalent C- P bind has been formed between aryl diazonium salts and phosphorene 3 and non- covalent interactions have been found to occur with aromatic compounds. Here we report on a functionalization study of phosphorene by organic luminescent dyes based on pyrene core, bearing boronic functionalities. Pyrene 1- boronic acid (PBA), 4,4,5,5- tetramethyl- 2-pyren-1-yl-1,3,2- dioxaborolane (PBE) and pyrene (PY) have been examined. Spectroscopic investigations have showed a change of time resolved properties of the chromophores, i. e. the increase of fluorescence lifetime and of rotational correlation time, thus indicating the occurrence of an interaction between pyrenes and phosphorene. This work provides new insights on chemical properties of phosphorene, opening the way to a new functionalization strategy of the material by organic luminescent dyes. For example, due to the excellent optical response of pyrene, surface analysis of the material can be carried out, i. e. identification of superficial defects whose determination is important for the use of phosphorene in electronic devices.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
