Synthesis and field emission properties of topological insulator Bi₂Se₃ nanoflake arrays.
High quality Bi(2)Se(3) nanoflake arrays with a large area and high-yield production have been fabricated by chemical vapor deposition. As the essential candidate for a topological insulator, the unique surface electronic states are considered to play a crucial role distinct from the bulk. Our experimental results show that environmental doping significantly affects the field emission properties of the synthesized Bi(2)Se(3) nanoflake arrays. X-ray photoelectron spectroscopy characterizations indicate that the rapid surface oxidation may prohibit the detection of the topological surface state and results in a low field emission current. This work provides another insight to investigate the surface state of topological insulator materials.
State Key Laboratory for Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871, People's Republic of China.
Yuan
Y
Yan
Zhi-Min
ZM
Liao
Feng
F
Yu
Han-Chun
HC
Wu
Guangyin
G
Jing
Zhi-Cheng
ZC
Yang
Qing
Q
Zhao
Dapeng
D
Yu