Abstract
Abstract Novel star shaped α-Fe2O3/Au nanocomposites have been synthesized by following a low cost as well as simple two-step method through chemical precipitation and seed growing technique. α-Fe2O3 nanoparticles have been precipitated from Iron (III) nitrate nanohydrate by ammonia solution and subsequently citrate capped and then Au has been deposited on the surface of the nanoparticles through reduction of Gold (III) chloride trihydrate by Hydroxylammonium chloride. The α-Fe2O3/Au nanocomposites are well crystalline in nature with excellent star/flower shaped particles having uniform arms/petals of length ∼ 174 nm and maximum width ∼ 51 nm. XRD of nanocomposites show peaks representing all the crystal planes of Au and major crystal planes of α-Fe2O3.The optical absorbance band of the α-Fe2O3 nanoparticles is observed to shift considerably towards higher wavelength on their composite formation with gold. Magnetic measurements show that both α-Fe2O3 nanoparticles and α-Fe2O3/Au nanocomposites are weakly ferromagnetic, having values of magnetization, respectively, 0.99 emu/g and 0.36 emu/g at a magnetizing field of 50 kOe.
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