Antimicrobial activity of silver sulfide quantum dots functionalized with highly conjugated Schiff bases in a one-step synthesis

Abstract

In the present paper, low-dimensional Ag2S QDs were fabricated for the first time, with four different dithiocarbazate derivative Schiff bases (SB) as capping agents in a one-pot synthesis.

Review of Metal Sulfide Nanostructures and their Applications

“…277 It has wide applications in several areas like bioimaging, cancer photothermal therapy, food packing, solar cells, and photocatalysis because of its unique NIR emission, antimicrobial activity, high quantum yield, photothermal conversion efficiency and chemical stability, excellent photostability, narrow bandgap energy (0.9−1.1 eV), large optical absorption coefficient, nontoxicity, and environmentally friendly nature. 272,273 In the past few years, some significant applications of various morphology-oriented Ag 2 S nanomaterials prepared by different synthesis routes have been investigated as described in Table 8 and Figure 9. This recent research represents that Ag 2 S NSs have been prepared by various synthesis routes including coprecipitation, precipitation, and green synthesis methods for their utilization in antibacterial (MIC 5−75 μg mL −1 ) and antifungal (MIC 80−310 μg mL −1 ) activities, cancer photothermal therapy (efficiency 58.6%), bioimaging/antibacterial activity against Gve E. coli (90%) and G+ve B. thuringiensis (70%).…”

“…Ag 2 S nanomaterials have been synthesized by various chemical methods like microwave, water-phase, thermal decomposition, hydrothermal, coprecipitation, and reverse microemulsion. , Ag 2 S QDs are less toxic fluorescent nanomaterials usually synthesized by the physical and chemical methods of the inorganic phase (hydrophobic) due to the action of organic ligands, and a surface ligand exchange process is an effective phase conversion method for biological applications in intermediate infrared regions and near-infrared (NIR). , Moreover, colloidal Ag 2 S NPs were synthesized by green synthesis using plant parts aqueous extracts (leaves, seeds, fruits, and roots) and royal jelly or albumins, which contain macronutrients as effective stabilizing agents . Ag 2 S has three polymorphic modifications, monoclinic phase of α-Ag 2 S acanthite, body-centered cubic (bcc) superionic β-Ag 2 S argentite, and face-centered cubic (fcc) γ-Ag 2 S sulfide at temperatures < 450 K, 452–859 K, and ∼860 K, respectively.…”

“…Ag 2 S with particle size of <60 nm is monoclinic . It has wide applications in several areas like bioimaging, cancer photothermal therapy, food packing, solar cells, and photocatalysis because of its unique NIR emission, antimicrobial activity, high quantum yield, photothermal conversion efficiency and chemical stability, excellent photostability, narrow bandgap energy (0.9–1.1 eV), large optical absorption coefficient, nontoxicity, and environmentally friendly nature. , …”

Biopolymeric Ni3S4/Ag2S/TiO2/Calcium Alginate Aerogel for the Decontamination of Pharmaceutical Drug and Microbial Pollutants from Wastewater

“…Under solar light illumination, aerogels work more efficiently due to the production of more active charged and radical species like e − , h + , − O 2 , OH, and H 2 O 2 . A synergistic effect between Ni 3 S 4 , Ag 2 S, and TiO 2 in Ni 3 S 4 /Ag 2 S/TiO 2 /CA aerogel has been observed and produced more active radical species, increasing the cytotoxicity within the microbe’s cell and destroying the nucleic acids [ 37 ]. The electron transfer mechanism is also expected to occur for the semiconductor Ni 3 S 4 /Ag 2 S/TiO 2 in Ni 3 S 4 /Ag 2 S/TiO 2 /CA aerogel.…”

“…These e − are absorbed by the cell wall and water molecules and generate ROS. This ROS kills the microbial cells [ 37 , 39 ]. A detailed mechanism of microbial decontamination is shown in Figure 15 .…”