Covalent functionalization of two-dimensional black phosphorus nanosheets with porphyrins and their photophysical characterization

摘要: Black phosphorus nanosheets (BPNSs) are a rising star among 2D materials and hold applications in wide range of research areas. However, the poor stability BPNSs due to chemical degradation presence air water limits their practical applications. Chemical functionalization is promising strategy improve impart new properties BPNSs. Herein, functional porphyrin units attached onto through direct phosphorus–carbon linkage using diazonium chemistry. The functionalized characterized Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), infrared (IR) transmission electron microscopy (TEM) analyses. formation P–C bond between confirmed by appearance peak at 131.16 eV high resolution P 2p XPS spectrum. A control experiment under similar conditions with free porphyrins further supports covalent attachment precluding noncovalent interactions hybrid. Furthermore, photophysical BPNS–TPP hybrid were investigated detail steady state time-resolved spectroscopic techniques. Importantly, exhibit an improved ambient compared pristine BPNSs, UV-Vis absorption measurements. This study proposes potential useful route obtain stable holding optoelectronic devices such as nonlinear optics solar energy harvesting devices.