Epitaxial Growth of CdS Nanoparticle on Bi₂S₃ Nanowire and Photocatalytic Application of the Heterostructure

Abstract

Bi 2 S 3 nanowire/CdS nanoparticle heterostructure has been designed and constructed through an easy wetchemistry approach at 140 °C for 8 h. The product is mainly composed of Bi 2 S 3 nanowires, several hundred nanometers long and 10 nm wide, and epitaxially grown triangle-like CdS nanoparticles with size of 20 nm at their surfaces. A possible sequential deposition growth mechanism is proposed on the basis of experimental results to reveal the formation of the nanoscale heterostructure. Under the irradiation of UV light, the as-prepared nanoscale Bi 2 S 3 /CdS heterostructure exhibits enhanced photochemical efficiency that can be mainly attributed to the microstructure of the product. In the nanoscale heterostructure, the CdS nanoparticle not only determines the overall band gap energy, but also controls the charge carrier transition, recombination, and separation, while the Bi 2 S 3 nanowire serves as support for the CdS nanoparticle, defines the specific surface area of the product and thus influences the photocatalytic activity. The effects of reaction parameters on the structure and photocatalytic activity of the final product are also discussed.

Rationally Designed n–n Heterojunction with Highly Efficient Solar Hydrogen Evolution

“…For instance, a CdS-quantum-dotssupported Ga 2 O 3 heterostructure with an enhanced photocatalytic activity has been prepared, and its band gap positions are also consistent with Type II heterojunction in Figure 1 b. [7] Similar work on CdS-Bi 2 S 3 heterostructure has been reported by Chen et al [8] So it is reasonable to believe that the work may bring inspirations in the wide choice of semiconductors in photocatalytic applications.…”

Layer-controlled growth of MoS2 on self-assembled flower-like Bi2S3 for enhanced photocatalysis under visible light irradiation

“…6 Generally, the semiconductor that is incorporated as a cocatalyst to construct such a self-established heterojunction should possess good electric conductivity, a suitable energy structure and excellent electrochemical activity. [7][8][9][10][11] As a typical layered metal sulfide, MoS 2 has drawn increasing attention because of its layered structure similar to that of graphene, which is composed of three atom layers stacked together through Van der Waals interactions. 12,13 Such a two-dimensional (2D) layeredcrystal structure provides convenient electron transfer and many active sites for interfacial adsorption.…”

Structural, optical and thermal properties of CdS/Bi2S3 nanocomposites

“…In particular, bismuth sulfide (Bi 2 S 3 ) is one of the most essential members, since it is a promising candidate for photovoltaic converters due to its low energy gap and has been used widely in thermoelectric cooling technologies [4][5][6]. CdS and Bi 2 S 3 nanocomposites have received considerable attention during the recent years because of their potential application in conversion of solar energy into electrical energy and in variety of semiconductor devices [7,8]. The energy band gap of CdS and Bi 2 S 3 is 2.4 and 1.4 eV, respectively [9].…”