Layer Identification of Colorful Black Phosphorus

Hongye Chen; Wenwen Fei; Jianxin Zhou; Chunyang Miao; Wanlin Guo

doi:10.1002/smll.201602336

Layer Identification of Colorful Black Phosphorus

Small. 2017 Feb;13(5). doi: 10.1002/smll.201602336. Epub 2016 Nov 18.

Authors

Hongye Chen¹, Wenwen Fei¹, Jianxin Zhou¹, Chunyang Miao¹, Wanlin Guo¹

Affiliation

¹ State Key Laboratory of Mechanics and Control of Mechanical Structures, Key Laboratory for Intelligent Nano Materials and Devices of Ministry of Education and Institute of Nano Science, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China.

PMID: 27860273
DOI: 10.1002/smll.201602336

Abstract

A quick method for estimating the layer number of black phosphorus is demonstrated by simple color-comparison using optical microscope in this paper. A thickness-dependent reflection model of black phosphorus/SiO₂ /Si is constructed and a colorbar confirmed by experiments is obtained for quick identifying layer number. The enhanced visibility affected by substrates or wavelength of light is further verified by calculating the contrast.

Keywords: black phosphorus; colors; layer numbers; monochromatic light; optical methods.

Publication types

Research Support, Non-U.S. Gov't