Abstract
Cetyltrimethylammonium bromide (CTAB) and chitosan capped iridium-silver nanoparticles (Ir-AgNPs) were synthesized by using seedless co-reduction of metal salts precursors with sodium borohydride. CTAB and chitosan capped Ir-Ag shows surface Plasmon resonance (SPR) band at 420 nm and 430 nm, respectively. Chitosan + Ag+ + Ir3+ reaction mixture reduced much faster than that of CTAB + Ag+ + Ir3+ with NaBH4. Average Brunauer-Emmett-Teller (BET) surface area, particle size, cumulative pore size, cumulative pore volume were found to be 49.07 m2/g, 2.77 nm, 8.10 nm, 0.19 cc/g and 41.84 m2/g, 3.25 nm, 7.85 nm, 0.16 cc/g, respectively, for CTAB and chitosan capped Ir-AgNPs. The CTAB-Ir-AgNPs exhibit better stability in the wide range of pH and temperature for ca. several months. SEM, TEM, EDX, XRD, XPS, and FTIR were used to analyze the surface morphology, size, elemental composition, crystalline nature, oxidation states of metals and functional groups capping action of as-prepared Ir-AgNPs.
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