SYNTHESIS AND CHARACTERIZATION OF SOL-GEL DERIVED INDIUM TIN OXIDE (ITO) NANOPARTICLES VIA PECHINI METHOD

سال انتشار: 1390
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 422

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شناسه ملی سند علمی:

UFGNSM03_019

تاریخ نمایه سازی: 10 تیر 1396

چکیده مقاله:

The indium tin oxide (ITO) nanopowders were synthesized via Modified Pechini Sol-Gel Method, using InC13 and SnCl2.2H20 as precursors, absolute ethanol and deionized water as solvents. After gelation, the obtained material were dried and calcined at 400-700°C for 1 h in air. The influences of Sn dopant content and heat treatment temperature on the thermal behavior, phase, morphology and optoelectronic properties of ITO nanoparticles were studied by means of differential thermal analysis and thermogravimetry (DTA-TG), X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and diffuse reflectance spectroscopy (DRS) methods, respectively. The DTA-TG curves show that crystallization temperature increases by adding Sn to indium oxide (In203). XRD results show crystalline bixbyite structure for indium tin oxide nanoparticles. The FESEM micrographs show that ITO nanoparticles formed with average diameter of about 25-60 nm. Optical absorption measurements imply that the optical direct band gap of In203 nanoparticles were increased with addition of Sn dopant. The widening of optical band gap can be due to increasing of the carrier concentration as determined from the Burstein—Moss effect. However, the optical band gap decreases toward lower energies with an increase in the Sn dopant content above 6 at.%, which may be due to lattice distortion results in electron impurity scattering.

کلیدواژه ها:

Indium Tin Oxide (ITO) ، Modified Pechini Sol-Gel Method ، Nanostructure particles ، optoelectronic properties

نویسندگان

HOSSEN ABDIZADEH

School of Metallurgy & Materials Engineering, College of Engineering, University of Tehran, Tehran, Iran.

SAEED MOHAMMADI

School of Metallurgy & Materials Engineering, College of Engineering, University of Tehran, Tehran, IranP.O Box. ۱۱۱۵۵-۴۵۶۳, Tel/Fax. +۹۸۶۱ ۱۴۱۵۷

MOHAMMAD REZA GOLOBOSTANFARD

School of Metallurgy & Materials Engineering, College of Engineering, University of Tehran, Tehran, Iran.P.O Box ۱ ۱۱۵۵-۴۵۶۳, Tel/Fax. +۹۸۶۱ ۱۴۱۵۷