| AVS 62nd International Symposium & Exhibition | |
| 2D Materials Focus Topic | Wednesday Sessions |
| Session 2D+MN+NS+SP+SS+TF-WeM |
| Session: | Mechanical and Thermal Properties of 2D Materials |
| Presenter: | Xiaolong Liu, Northwestern University |
| Authors: | X. Liu, Northwestern University J.D. Wood, Northwestern University K.-S. Chen, Northwestern University E. Cho, Northwestern University M.C. Hersam, Northwestern University |
| Correspondent: | Click to Email |
Two dimensional (2D) black phosphorus (BP) has attracted significant attention due to its superlative electronic and optical properties. Unlike graphene, its intrinsic and thickness-dependent band gap makes it feasible for direct application in electronic and optoelectronic devices.1 However, before 2D BP can be effectively employed in such applications, it is necessary to establish the thermal stability of 2D BP since annealing is a key element in most device fabrication processes. Towards this end, we have utilized in situ scanning/transmission electron microscopy and spectroscopy methods to characterize the thermal decomposition process of mechanically exfoliated 2D BP.2 The decomposition is observed to occur at ~400 °C in the form of sublimation, compared to the 550 °C of bulk BP. This decomposition initiates via eye-shaped cracks along the [001] direction and then continues until only a thin, amorphous red phosphorous-like skeleton remains. In situ electron energy loss spectroscopy, energy-dispersive X-ray spectroscopy, and energy-loss near-edge structure changes provide further quantitative insight into this chemical transformation process.
(1) Qiao, J.; Kong, X.; Hu, Z.-X.; Yang, F.; Ji, W. Nature Comm.2014, 5, 4475.
(2) Liu, X.; Wood, J. D.; Chen, K.-S.; Cho, E.; Hersam M. C. J. Phys. Chem. Lett.2015, 6, 773-778.