A microwave route for the synthesis of nanoflakes and dendrites-type, beta-In2S3 and their characterization

作者：Patra CR; Patra S; Gabashvili A; Mastai Y; Koltypin Y; Gedanken A^*; Palchik V; Slifkin MA

来源：Journal of Nanoscience and Nanotechnology, 2006, 6(3): 845-851.

DOI：10.1166/jnn.2006.134

• indium sulfide
• semiconductors
• nanoflakes
• dendrites
• microwave heating
• polyol route

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(III)chloride and thiourea in an ethylene glycol, (EG)/polyethylene glycol (PEG(400)) 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 nanomaterials. 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.

• 出版日期2006-3