A microwave route for the synthesis of nanoflakes and dendrites-type beta-ln2S3 and their characterization.
In this article, a simple microwave route was applied for the synthesis of nanoflakes and dendrite-type beta-indium sulfide (In2S3) in high yield (> 97%), using a homogeneous mixture of indium(lll)chloride and thiourea in an ethylene glycol (EG)/polyethylene glycol (PEG400) solvent. The reaction was conducted in a simple domestic microwave oven (DMO). Powder X-ray diffraction (XRD), low resolution and high resolution transmission electron microscopy (LRTEM and HRTEM), selected area electron diffraction (SAED), and energy dispersive X-ray spectroscopy (EDS), were applied to investigate the crystallinity, structure, morphology, and composition of the In2S3 nano-materials. Both the as-synthesized and calcined In2S3 products were a body-centered tetragonal (bct) phase, observed by XRD and HRTEM. The length and width of the resulting nanoflakes were in the range of 70-600 nm and 4-10 nm, respectively. The optical band gap of the powder was determined by diffuse reflectance spectroscopy (DRS) and was found to be 2.44 eV. The electronic properties of the products were studied by measuring the optical absorption spectra using photoacoustic spectroscopy. The band gap calculated by this method was found to be 2.52 eV. A possible mechanism for the formation of nanoflakes/dendrites-type In2S3 was also discussed.
Department of Chemistry, Kanbar Laboratory for Nanomaterials, Bar-Ilan University Center for Advanced Materials and Nanotechnology, Bar-Ilan University, Ramat-Gan 52900, Israel.
Chitta Ranjan
CR
Patra
Sujata
S
Patra
Alexandra
A
Gabashvili
Yitzhak
Y
Mastai
Yuri
Y
Koltypin
Aharon
A
Gedanken
Valery
V
Palchik
Michael A
MA
Slifkin
D003460:Crystallization / Q000379:methods*; D007204:Indium / Q000737:chemistry* / Q000528:radiation effects*; D008422:Materials Testing; D008872:Microwaves; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000528:radiation effects / Q000648:ultrastructure*; D036103:Nanotechnology / Q000379:methods*; D010316:Particle Size; D012666:Semiconductors; D013455:Sulfur / Q000737:chemistry* / Q000528:radiation effects*
C078893:indium In 113m sulfur colloid; D007204:Indium; D013455:Sulfur