Abstract
Nickel based bimetallic nanocrystals, iridium-nickel play an imperative role in catalysis, electrocatalysis, and magnetic applications. In the present work Ir-Ni bimetallic nanoalloys were synthesized by modified polyol reduction method with different cationic, anionic, and non-ionic surface active agents like CTAB, SDS, TSC, and PVP. The non-ionic surface active agent PVP produced a better effect on nanoparticle size than cationic and anionic surfactants. The synthesized bimetallic nanocrystals were characterized by UV-Vis, XRD, FTIR, FESEM, and HRTEM techniques. XRD and FTIR verify the nature of synthesized bimetallic nanocrystals and the interaction between stabilizers and nanoparticles. HRTEM studies reveal that the PVP stabilized Ir-Ni (3:1) and Ir-Ni (1:1) bimetallic nanocrystals are small in size and less dispersed. Particle size range of these nanoparticles is from (1.77-2.36) nm. FESEM images show that nanoparticles are in quasi spherical shape. EDX analysis indicates that the resultant particles are core shell structure with Ni core and Ir shell.
Highlights
Nanoparticles are the nanometer-sized sturdy particles, negotiated at atomic or molecular scale, to perform either novel or superior physical properties that are not feasible by conventional bulk solids
FESEM images show that nanoparticles are in quasi spherical shape
Surface active agents play an imperative role in the synthesis of nanoparticles
Summary
Nanoparticles are the nanometer-sized sturdy particles, negotiated at atomic or molecular scale, to perform either novel or superior physical properties that are not feasible by conventional bulk solids. Surface active agents or stabilizers automatically diminish the particle size without altering the structure and reducing ability depending on the type of surfactants.[18]. Surface active agents can be determined according to the charge exist in the hydrophilic part of the fragment i.e. cationic, anionic, amphoteric, and non-ionic surfactants.[19]. We have synthesized Ir-Ni bimetallic nanocrystals with (3:1), (1:3), and (1:1) ratios by polyol reduction method, using cationic (CTAB), anionic (SDS, TSC) and non-ionic (PVP) capping agents. These particles were explored using UV-Visible, XRD, FESEM, HRTEM, FTIR methods of analysis
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