Abstract
Commonly transition metal nano particle are synthesized by physical, chemical or electrochemical methods. In the present work colloidal iridium nanoparticles were synthesized by chemical oxidation method with different surfactants like poly vinyl pyrrolidone (PVP), poly vinyl alcohol (PVA) and poly oxyethylene lauryl ether (POLE). It was found that shape and size of Ir-nano particles resulted were related to kind of capping agent (surfactant) used. The characterization of the synthesized nano particle has been carried out by UV-vis, X-ray diffraction (XRD), FT-IR, scanning electron microscopy (SEM) and transmission electron microscopic (TEM) techniques. UV-vis and FT-IR confirm the oxidation of IrCl3 into IrO2 while XRD confirms the amorphous nature of the iridium nanoparticles synthesized. The morphology and size of the particle were confirmed by TEM. The average particle size determined by Scherrer equation was about 4.12 nm to 4.23 nm with PVP, 2.74 to 3.36 nm with PVA and 20.41 to 42.25 nm with POLE. Poly oxyethylene lauryl ether particles were not further analyzed because of their large size and less stability. Further particle size was confirmed with TEM, which was 4.5 nm with PVP and 7.0 nm with PVA. The particles are spherical with no agglomeration tendency.
Highlights
Transition metal nanoparticles are of continuing interest because of their fascinating catalytic, electronic, and optical properties
In the present work colloidal iridium nanoparticles were synthesized by chemical oxidation method with different surfactants like poly vinyl pyrrolidone (PVP), poly vinyl alcohol (PVA) and poly oxyethylene lauryl ether (POLE)
In the present work iridium nanoparticles are successfully prepared by refluxing the alcohol water solution of iridium trichloride in the presence of polymer such as poly vinyl pyrrolidone, polyvinyl alcohol and poly oxyethylene lauryl ether
Summary
Transition metal nanoparticles are of continuing interest because of their fascinating catalytic, electronic, and optical properties. These ultrafine particles often agglomerate to form either lumps or secondary particles in order to minimize the total surface or the interfacial energy of the system it is very important to stabilize the particles against adverse agglomeration at both the syn-. There have been numerous types of stabilizers that have been used as capping agent for stabilizing nanoparticles. It is well known that type of stabilizer that is used to cap the nanoparticles affects their stability and in turn affects its catalytic activity [13]. A few reports of iridium nanoparticles synthesis exist in the literature [5,6]. The water soluble alcohol like methanol, ethanol and propanol are used as oxidant for the synthesis of iridium nano clusters
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