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2 results on '"Ali Asghar Sabbagh Alvani"'

1. X-ray Diffraction and SEM Studies on the Effect of Temperature on the Formation of Main Phase Sr2MgSi2O7 Using a Wet and Dry Method for its Preparation

Author

Ali Asghar Sabbagh Alvani, Ali Asghar Sarabi, Fathollah Moztarzadeh, Mohammad Rabie, and Mohammad Javad Kamali

Subjects
silicate host, main phase, firing temperature, wet and dry methods, Chemical engineering, TP155-156, Chemistry, QD1-999
Abstract

A pure Silicate host namely Sr2MgSi2O7 as a support for a long-lasting afterglow when dopped with rare-earth elements was sought after. To this end the process of obtaining firing temperatures of the above mentioned phase in normal condition was carried out using suggested wet and dry methods. The degree of purity obtained in these preparatory methods as well as the different firing temperatures were studied by the aid of SEM and XRD techniques. It was found that for the wet method there exists a temperature beyond which the amount of impurity remained constant. There also existed a temperature at which both the wet and dry methods gave the same amount of impurity. Beyond this temperature the wet method would be preferred.

Published
2005

2. Effect of sulfonating agent and ligand chemistry on structural and optical properties of CuSbS2 particles prepared by heat-up method

Author

Shima Moosakhani, Yanling Ge, Ali Asghar Sabbagh Alvani, Raheleh Mohammadpour, Simo-Pekka Hannula, Jani Sainio, Department of Chemistry and Materials Science, Amirkabir University of Technology, Sharif University of Technology, Department of Applied Physics, Aalto-yliopisto, and Aalto University

Subjects
Chemistry, Band gap, chemistry.chemical_element, 02 engineering and technology, General Chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Nanocrystalline material, 0104 chemical sciences, chemistry.chemical_compound, Antimony, Chemical engineering, Thiourea, Oleylamine, General Materials Science, Particle size, Cyclic voltammetry, 0210 nano-technology, ta116, ta215, Perovskite (structure)
Abstract

Chalcostibite copper antimony sulfide (CuSbS2) is a promising candidate for application in solar cells. The functionality of CuSbS2 particles depends on particle size and morphology and controlling these two parameters during synthesis is of utmost importance. In this study, CuSbS2 particles were prepared by a facile heat-up synthesis method utilizing sulfur powder (Su) and thiourea (Tu) to investigate the effect of the sulfur source on the structural and physical properties of CuSbS2 particles. Different morphologies were observed when Su and Tu were employed. The results demonstrated that the shape uniformity can be improved by applying a coordinating sulfur precursor (Tu). Moreover, nanoplatelet- and nanobrick-shaped particles were obtained by changing the ligand chemistry, i.e., by using a different combination of oleylamine (OLA), 1-octadecene (ODE), and oleic acid (OL). Band gap calculations showed that CuSbS2 had direct and indirect bandgaps with a small difference of 0.2 eV. Composition analysis of samples obtained from the Tu precursor revealed that antimony contents varied resulting in differences of the lattice parameter c. Moreover, valence band (VB) and conduction band (CB) positions determined by cyclic voltammetry (CV) suggested that this material based on its composition can have dual applications: first, as an absorber in nanocrystalline solar cells and second, as a hole transport material in perovskite solar cells.

Published
2018

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