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XRD of silver sulfide structures synthesized with CO gas (a) and without CO (b). In both cases, silver phase which comes from the silver substrate is also observed.
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Silver sulfide hierarchical structures with unique dorsal spine morphology were successfully synthesized on mechanically deformed silver substrates by simple solid-vapor reactions. It has been found that it is possible to change the structures morphology by changing the reagent gas composition. The carbon monoxide (CO) presence in a reactive sulfur...
Citations
... In addition, it also can be inferred that the final oxidation product of Ag metal in the S/AgI composites could be a mixture of AgI, Ag 2 S and Ag 2 S 2 by comparing with the standard card and considering the thermal stability. 47 From the above results, we can consider that Ag and LiI are produced during the discharge process, which can improve the conductivity of the electrode. In addition, it is believed that the proper amount of LiI can inhibit the shuttle effect by inducing the formation of protective coating, combined with literature reports and our previous work. ...
Rechargeable lithium-sulfur (Li-S) batteries are recognized as one of the most promising candidates for next-generation energy storage devices due to their high energy density and high theoretical capacity, along with abundant natural resources, low cost, and the non-toxicity of sulfur. However, applications of Li-S battery have been hindered by limited specific capacity due to the poor conductivity and low content of sulfur, as well as fast capacity fading caused by polysulfide shuttling problems. Here, silver iodide is introduced as a host material for fabricating sulfur cathodes for Li-S batteries. Silver metal and lithium iodide, as the discharge products of silver iodide, can improve the redox environment, increase the ionic and electronic conductivity, and inhibit the shuttle of polysulfides during the charge and discharge processes. With a high sulfur content of 90.4%, the S/AgI composite delivers enhanced cycle performance with a decay rate of 0.092% per cycle within 500 cycles at 0.5 C, thanks to the synergistic effect of silver and lithium iodide. This opens the door to the rational design of halogen-containing transition-metal compounds as a class of cathode materials for Li-S battery.
... La sulfuración se llevó a cabo bajo el mismo procedimiento de las nanoestructuras 3D. Adicionalmente, en esta metodología, se puede incluir el efecto de otro gas dejando fluirlo dentro del contenedor o el efecto del voltaje conectando una fuente de poder al sustrato a sulfurar (Muñiz et al. 2012y Martínez et al. 2014 Mecanismo de reacción El mecanismo general de reacción y del crecimiento de los sulfuros (Figura 1) se describe a continuación y está de acuerdo a lo publicado por Cao (2004). ...
... De acuerdo a Graedel et al. (1985) el COS y la plata reaccionan de manera similar al H2S y la plata para formar Ag2S. Entonces, existe una adsorción y desorción de los elementos de crecimiento que provienen de la fase de vapor causando el crecimiento de la reacción momentánea entre el COS y la plata que podría generar un camino truncado y un crecimiento preferencial (Muñiz et al. 2012). Para la formación de nanoestructuras de sulfuro de cobre, las reacciones propuestas y el mecanismo de crecimiento es similar a la informada para el sistema Ag-S. ...
Resumen-Las nanoestructuras de Sulfuro de Plata y Sulfuro de Cobre debido a sus propiedades ópticas y eléctricas son de gran interés para aplicaciones en diodos de emisión de luz, sensores de gas, celdas solares, biosensores, entre otras. Estas nanoestructuras se obtienen con diversos métodos de síntesis como deposición por baño químico, método hidrotermal, pulverización catódica, método sol gel y reacciones de sólido-vapor. Este último método de síntesis es atractivo por su bajo costo, baja temperatura de procesamiento (110 o C) y muy baja formación de sub-productos. En este trabajo, se detalla el proceso de síntesis de nanoestructuras 2D y 3D de sulfuros de cobre y sulfuros de plata mediante reacciones sólido-vapor. El efecto de variables de procesamiento como temperatura, tiempo y atmósfera son presentados. Palabras clave-Sulfuro de plata, Sulfuro de Cobre, Reacción Sólido-Vapor, Nanoestructuras.
... If more copper is present, there is more diffusion and grow of copper sulfide in layers that produce a thicker structure. The proposed reaction and growing mechanism is similar to the one reported for the Ag-S system in our previous work [23]. Sulfur ions (S -2 ) coming from the gas atmosphere react with the Cu ions (Cu + ) on the glass substrates to form copper sulfide CuS compounds. ...
Copper sulfide thin films were obtained by sulfidizing sputtered copper substrates through a simple solid-vapor reaction at 110°C for 3 h. The thin films were characterized by Small Angle X-Ray Diffraction, Field Emission Gun Scanning Electron Microscopy, X-Ray Photo Electron Spectroscopy and Raman Spectroscopy. Films are made of hexagonal Covellite (CuS) phase. Thickness of the films varies from 70 to 110 nm. A granular to smooth morphology transition is seen with thicker initial sputtered copper deposits. Optical properties were determined by UV-VIS Spectroscopy. Semiconductor behavior was observed with band gaps ranging from 2.05 to 2.25 eV depending mainly on the films thickness. © 2015, National Institute R and D of Materials Physics. All rights reserved.
... As such, tuneable and controllable thickness thin film deposition is of crucial importance in attaining their desired absorbing. Previously, Ag 2 S thin films with different morphologies have been prepared via various methods, such as solid-vapor reactions [31], radio frequency sputtering [32], thermal evaporation [33], electro deposition [34], successive ionic layer absorption and reaction (SILAR) [35] and chemical bath depositions (CBD) [6]. As in most of metal sulfide materials, a crucial property for solar energy harvesting is the resulting conductivity. ...
... Many ways of Ag 2 S deposition have been reported so far, including chemical bath deposition (CBD) [15][16][17], Ag metal sulfurization [18], electrodeposition [19], successive ionic layer adsorption and reaction (SILAR) [20,21], thermal evaporation [22] and solid-vapor reactions [23]. Our interest is in designing Ag 2 S deposition methods that would be inexpensive and result in a facile formation on a wide array of substrates. ...
The synthesis of metal sulfide semiconductor nanoparticles has gained extensive recognition by researchers due to their technological applications in nanoscale systems. Silver sulfide (Ag2S) in the nanoscale regime considerably affects its functioning in various light-sensitive systems. In this chapter, we will discuss how Ag2S semiconducting nanoscale compounds offer a diverse range of nanostructures and have unique chemical, physical, electronic phenomena, and novel functional properties and applications. In general, the mechanism of the formation of Ag2S nanostructures is not well understood. We will also discuss how to control and achieve various morphologies of Ag2S nanostructures and also throw light on charge carriers and their properties in nanoscale compounds. We will extensively review the different methods for the preparation of Ag2S nanostructures, the heterostructures, and hybrids. It will provide an overview of recent advances and the variation in the chemical, physical, optical properties of Ag2S nanoscale compounds. At last, we will discuss important applications in diverse areas, including photocatalysis, theranostics, optoelectronics, and biological applications.
Solar energy is an example of renewable energy. It is free, clean and inexhaustible. Currently, there are two types of semiconductors, namely n-type and p-type. These semiconductors consist of n-type and p-type absorb sunlight, then produce electricity. Thin films based solar cells have many advantages if compared to silicon based solar cells, such as light in weight, low cost, simple design and eco-friendly. In this work, chemical bath deposition method has been used to synthesis ternary nanostructured Cu4SnS4 films. Na2EDTA solution was served as complexing agent during the deposition process. The influence of Na2EDTA on the properties of thin films was studied using X-ray diffraction (structural properties), atomic force microscope (topography property) and UV-Visible Spectrophotometer (optical property).
