On thermal stability of nanocrystalline Ag–Cu-S powders

The nanocrystalline semiconducting compounds based on the AgCuS system are considered as low-cost candidates of thermoelectric materials with improved thermal stability. The nanocrystalline Ag–Cu—S powders were prepared from metal nitrates and sulphur powder in tetraethylene glycol (TEG) solvent by...

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Bibliographic Details
Published in:Journal of nanoparticle research : an interdisciplinary forum for nanoscale science and technology 2021-07, Vol.23 (7), Article 138
Main Authors: Sopoušek, Jiří, Drenčaková, Dáša, Brož, Pavel, Buršík, Jiří, Zemanová, Adéla, Roupcová, Pavla
Format: Article
Language:English
Subjects:
Atomic emission spectroscopy
Characterization and Evaluation of Materials
Chemical composition
Chemistry and Materials Science
Copper
Crystallites
Crystals
Electric properties
Emission analysis
Ethanol
Graphene
Heat treatment
Heat treatments
Inductively coupled plasma
Inorganic Chemistry
Laboratories
Lasers
Materials Science
Metal nitrates
Microscopy
Nanocrystals
Nanoparticles
Nanotechnology
Nitrates
Nucleation
Optical Devices
Optics
Phase transitions
Phases
Photonics
Physical Chemistry
Research Paper
Silver
Substrates
Sulfur
Ternary systems
Thermal analysis
Thermal stability
Thermoelectric materials
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Summary:The nanocrystalline semiconducting compounds based on the AgCuS system are considered as low-cost candidates of thermoelectric materials with improved thermal stability. The nanocrystalline Ag–Cu—S powders were prepared from metal nitrates and sulphur powder in tetraethylene glycol (TEG) solvent by reductive agent NaBH 4 . The crystallite sizes of the observed phases were in the range between 60 and 80 nm. The chemical compositions of the as-received samples were analysed by the ICP-AES method and their phase compositions were evaluated by XRPD. The investigation was supplemented by DSC and in situ HTXRD thermal analysis. A more detailed in situ experiment was performed for a sample containing ternary phases. The nucleation and growth of silver micro-wires were first observed on the substrate involving ternary phases at isothermal heat treatment. The formation of silver wires and semi-conductive ternary thermoelectric phase (stromayerite τ 3 ) is explained by observed phase transformation. The obtained results are complemented by microscopy (LM, SEM, TEM). Graphical abstract
ISSN:1388-0764
1572-896X
DOI:10.1007/s11051-021-05244-y