Enhanced Photophysical Properties of Bi₂S₃/AgBiS₂ Nanoheterostructures Synthesized via Ag(I) Cation Exchange-Mediated Transformation of Binary Bi₂S₃

Abstract

Nanoheterostructures with multiple components and interfaces have gained much attention due to their promising photophysical properties. Here, we have synthesized rod-shaped Bi 2 S 3 /AgBiS 2 heterostructures via a cation exchange reaction, starting from the binary parent compound Bi 2 S 3 . The effective ionic radius of monovalent Ag + ion is proved to be the key factor for the intercalation of Ag + ions into the consecutive layers of the orthorhombic Bi 2 S 3 (212) plane and finally for the total conversion of Bi 2 S 3 to AgBiS 2 . Incorporation of Ag + ions into the Bi 2 S 3 matrix keeps the morphology of the system intact during this total conversion process. The feasibility of this transformation has been well understood through heat of reaction energy required to exchange one Bi and S atom with an Ag atom using density functional theory based on first-principle calculations. A type-I band alignment is observed at the interface of the Bi 2 S 3 /AgBiS 2 heterostructure, which has been confirmed from cyclic voltammetry studies. Due to the low band offset between conduction bands of Bi 2 S 3 and AgBiS 2 , electrons can easily move from one component to another through the interface, which improves the photoactivity of the nanoheterostructure. The high light absorption coefficient of both Bi 2 S 3 and AgBiS 2 is proved to be the most effective for the enhancement of the photoinduced properties.

Insight into the Effect of Stabilizers on Anticancer and Antibacterial Activity of AgBiS2 Nanomaterial

“…Bismuth‐based materials are significantly attractive due to their broad NIR absorption, in vivo and in vitro photothermal effect, and low cost [1,6] . Specifically, AgBiS 2 is known for various applications [1,3,6,9–21] and most prominently as good photothermal agents as they are non‐toxic, in vivo, and in vitro biocompatible [1,6] …”

“…[5] Bismuth-based materials are significantly attractive due to their broad NIR absorption, in vivo and in vitro photothermal effect, and low cost. [1,6] Specifically, AgBiS 2 is known for various applications [1,3,6,[9][10][11][12][13][14][15][16][17][18][19][20][21] and most prominently as good photothermal agents as they are non-toxic, in vivo, and in vitro biocompatible. [1,6] Many methods are available to synthesize AgBiS 2 nanoparticles, including microwave, solvothermal, and solid-state chemical reaction methods.…”

“…[1,6] Many methods are available to synthesize AgBiS 2 nanoparticles, including microwave, solvothermal, and solid-state chemical reaction methods. [1,3,6,[9][10][11][12][13][14][15][16][17][18][19][20][21] These methods involve complicated preparation procedures, high temperatures, and using surfactant or polymer molecules to stabilize the particle size in nano regimes. Nanoparticles interact with various cell biopolymers in the biological environment.…”

Design of Ag Injection in Bi2S3 (AgBiS2) Thin Films for Photoelectrochemical Cell and Solar Cell Applications

“…Generally, AgBiS 2 exists in two structural phases namely β-AgBiS 2 belongs to hexagonal structure (low temperature phase) and α-AgBiS2 belongs to a cubic structure (high-temperature phase). The latter one is of interest because it has potential applications in different elds such as photovoltaics and thermoelectric devices etc [7][8][9][10]. For instance, ITO/ZnO/AgBiS 2 /PTB7/MoO/Ag devices fabricated by J. T. Oh et al, (2020) [11] and I.…”

“…Oberg et al, (2020) [13] fabricated ITO/ZnO/AgBiS 2 (CQDs)/P3HT/MoO 3 /Ag device which showed lower photocurrent density. S. Paul et al, (2020) [8] have synthesized rod-shaped Bi 2 S 3 /AgBiS 2 heterostructures via cation exchange reaction, starting from binary parent compound Bi 2 S 3 . AgBiS 2 photodetector has exhibited broadband response with decent detectivity, and fast response of 700 ns reported by L. Jiang et al, (2020) [14].…”