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Direct synthesis of nanostructured silver antimony sulfide powders from metal xanthate precursors.

ABSTRACT: Silver(I) ethylxanthate [AgS₂COEt] (1) and antimony(III) ethylxanthate [Sb(S₂COEt)₃] (2) have been synthesised, characterised and used as precursors for the preparation of AgSbS₂ powders and thin films using a solvent-free melt method and spin coating technique, respectively. The as-synthesized AgSbS₂ powders were characterized by powder X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) spectroscopy. The crystalline AgSbS₂ powder was investigated using XRD, which shows that AgSbS₂ has cuboargyrite as the dominant phase, which was also confirmed by Raman spectroscopy. SEM was also used to study the morphology of the resulting material which is potentially nanostructured. EDX spectra gives a clear indication of the presence of silver (Ag), antimony (Sb) and sulfur (S) in material, suggesting that decomposition is clean and produces high quality AgSbS₂ crystalline powder, which is consistent with the XRD and Raman data. Electronic properties of AgSbS₂ thin films deposited by spin coating show a p-type conductivity with measured carrier mobility of 81 cm² V^-1 s^-1 and carrier concentration of 1.9?×?10¹⁵ cm^-3. The findings of this study reveal a new bottom-up route to these compounds, which have potential application as absorber layers in solar cells.

SUBMITTER: Alharbi YT

PROVIDER: S-EPMC7862388 | biostudies-literature | 2021 Feb

REPOSITORIES: biostudies-literature

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Direct synthesis of nanostructured silver antimony sulfide powders from metal xanthate precursors.

Alharbi Yasser T YT Alam Firoz F Salhi Abdelmajid A Missous Mohamed M Lewis David J DJ

Scientific reports 20210204 1

Silver(I) ethylxanthate [AgS2COEt] (1) and antimony(III) ethylxanthate [Sb(S2COEt)3] (2) have been synthesised, characterised and used as precursors for the preparation of AgSbS2 powders and thin films using a solvent-free melt method and spin coating technique, respectively. The as-synthesized AgSbS2 powders were characterized by powder X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM) and energy dispersive X-r ...[more]

PMID: 33542323

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Project description:We report the preparation and crystal structures of bis(diallydithiocarbamato)zinc(II) and silver(I) complexes. The compounds were used as single-source precursors to prepare zinc sulfide and silver sulfide nanophotocatalysts. The molecular structure of bis(diallydithiocarbamato)zinc(II) consists of a dimeric complex in which each zinc(II) ion asymmetrically coordinates with two diallydithiocarbamato anions in a bidentate chelating mode, and the centrosymmetrically related molecule is bridged through the S-atom that is chelated to the adjacent zinc(II) ion to form a distorted trigonal bipyramidal geometry around the zinc(II) ions. The molecular structure of bis(diallydithiocarbamato)silver(I) formed a cluster complex consisting of a trimetric Ag3S3 molecule in which the diallydithiocarbamato ligand is coordinated to all the Ag(I) ions. The complexes were thermolyzed in dodecylamine, hexadecylamine, and octadecylamine (ODA) to prepare zinc sulfide and silver sulfide nanoparticles. The powder X-ray diffraction patterns of the zinc sulfide nanoparticles correspond to the hexagonal wurtzite while silver sulfide is in the acanthite crystalline phase. The high-resolution transmission electron microscopy images show that quantum dot zinc sulfide nanoparticles are obtained with particle sizes ranging between 1.98 and 5.49 nm, whereas slightly bigger silver sulfide nanoparticles are obtained with particle sizes of 2.70-13.69 nm. The surface morphologies of the ZnS and AgS nanoparticles capped with the same capping agent are very similar. Optical studies revealed that the absorption band edges of the as-prepared zinc sulfide and silver sulfide nanoparticles were blue-shifted with respect to their bulk materials with some surface defects. The zinc sulfide and silver sulfide nanoparticles were used as nanophotocatalysts for the degradation of bromothymol blue (BTB) and bromophenol blue (BPB). ODA-capped zinc sulfide is the most efficient photocatalyst and degraded 87% of BTB and 91% of BPB.

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Direct synthesis of nanostructured silver antimony sulfide powders from metal xanthate precursors.

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Direct synthesis of nanostructured silver antimony sulfide powders from metal xanthate precursors.

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