Mesoporous Semiconductive Bi₂Se₃ Films

Abstract

Bi2Se3 is a semiconductive material possessing a bandgap of 0.3 eV, and its unique band structure has paved the way for diverse applications. Herein, we demonstrate a robust platform for synthesizing mesoporous Bi2Se3 films with uniform pore sizes via electrodeposition. Block copolymer micelles act as soft templates in the electrolyte to create a 3D porous nanoarchitecture. By controlling the length of the block copolymer, the pore size is adjusted to 9 and 17 nm precisely. The nonporous Bi2Se3 film exhibits a tunneling current in a vertical direction of 52.0 nA, but upon introducing porosity (9 nm pores), the tunneling current increases significantly to 684.6 nA, suggesting that the conductivity of Bi2Se3 films is dependent on the pore structure and surface area. The abundant porous architecture exposes a larger surface area of Bi2Se3 to the surrounding air within the same volume, thereby augmenting its metallic properties.

Living Growth Kinetics of Polymeric Micelles on a Substrate

“…Although biological systems are more complicated than ours, there is no doubt that our theoretical model can provide some valuable information for understanding these biological phenomena. In addition, polymeric micelles can be utilized as soft templates in the fabrication of complicated nanostructures, including polymeric brush nanostructures, surface arrays, mesoporous materials, etc. − The present work can provide valuable information for the construction of polymeric nanostructures, especially on the surfaces of substances.…”

Rapid Growth of Bi2Se3 Nanodots on MXene Nanosheets at Room Temperature for Promoting Sulfur Redox Kinetics

“…Bi 2 Se 3 nanodots showed a ball-like structure, and obvious lattice fringes were observed, indicating the crystal structure. The lattice spacing was 0.30 nm, which belonged to (015) lattice planes of rhombohedral Bi 2 Se 3 . STEM-EDS mapping proved that the elemental composition of the nanodot was Bi and Se (Figure S11).…”

Mesoporous Metastable CuTe2 Semiconductor

“…This increase in the deposition rate of CuTe 2 is more noticeable in the m -CuTe 2 -Al sample (0.51 nm s –1 , Figure S1d). Furthermore, the electrochemically active surface area (ECSA) , of the mesoporous thin film ( m -CuTe 2 -Al) is approximately 5.3 times that of the nonporous film deposited on the Al electrode ( np -CuTe 2 -Al) (Figure S3). With no significant difference in the morphology or pore size on both m -CuTe 2 -Al and m -CuTe 2 -Au films, the changes in the chemical compositions of the films were analyzed by energy-dispersive X-ray spectroscopy (EDX).…”