Syntheses, Growth Mechanism, and Optical Properties of [001] Growing Bi₂S₃ Nanorods

Abstract

Uniform Bi 2 S 3 nanorods growing along [001] have been synthesized from the precursor of Bi[S 2 CN(C 8 H 17 ) 2 ] 3 by two different approaches: solventless and solvothermal methods. The structure, morphology, and formation process of the nanorods have been investigated by SEM, TEM, HRTEM, XRD, and EDX analyses. The growth direction is intrinsically governed by the crystal structure motif and the high surface energy of the (001) plane of orthorhombic Bi 2 S 3 according to the CASTEP calculations. Besides, some important factors that influence the growth of Bi 2 S 3 nanorods, such as the length of alkyl group in the precursor and the reaction temperature are investigated. The optical band gap of the as-synthesized Bi 2 S 3 nanorods is measured to be 1.50 eV indicating a slightly blue shift owing to the quantum size effect.

Bi2S3 microflowers assembled from one-dimensional nanorods with a high photoresponse

“…4d. The TEM results are consistent with those reported for the 1D Bi 2 S 3 nanostructures previously, which are scribed to the highest surface energy of the (001) plane as well as the strongest bond energy of the c axis [31].…”

Bi2S3 nanostructures: A new photocatalyst

“…2(e), the particle has continuous one-dimensional lattice fringes with a spacing of ~0.357 nm, corresponding to the (130) facet exhibiting the strongest peak in the XRD pattern. Although the fringes of the (001) facet are not observed in the image, it can still be supposed that the nanorods grow along the [001] direction, which is perpendicular to the (130) facet, as has been observed in previous reports [32]. In Fig.…”

“…[30]) reacted with the injected sulfur source at an intermediate temperature to form Bi 2 S 3 rather than elemental bismuth due to the strong affinity between bismuth and sulfur. The lamellar structure of Bi 2 S 3 results in anisotropic growth along the c-axis which favors the final formation of onedimensional morphologies [32]. Figure 1 shows a typical XRD pattern of the resulting Bi 2 S 3 nanocrystals.…”

A novel Bi 2 S 3 nanowire @ TiO 2 nanorod heterogeneous nanostructure for photoelectrochemical hydrogen generation

“…1D TiO 2 NRs grown directly on a transparent conductive substrate is considered as a desirable nanostructure for the PEC cells, because of its large specific surface, high electron transport rate and easy synthesis [32,52]. In addition, on account of its highly anisotropic layer structure, Bi 2 S 3 tends to form 1D nanowire or nanorod nanostructure [53][54][55]. In our previous works, Bi 2 S 3 NWs were synthesized from the BiVO 4 via a simple hydrothermal process and the prepared films show an excellent PEC hydrogen generation performance [53].…”