Abstract
This paper presents the in-situ generation of gold nanoparticles (AuNPs) by reducing chloroauric acid (HAuCl4·H2O) with low molecular weight hydroxypropyl methylcellulose (HPMC), and HPMC-AuNPs nanocomposites are developed via solution casting method. The generation of AuNPs was initially established by a swap in color from pale yellow to purple, and then by UV–Visible (UV–Vis) spectrophotometry with the surface plasmon resonance (SPR) band observed at λ = 550 nm. The functional groups accountable for the reduction of gold ions to neutral gold atoms were identified using Fourier transform infrared spectroscopy (FT-IR). The crystalline form of the AuNPs with FCC structure was shown by X-ray diffraction (XRD) studies. The size and shape evolution of the different shaped AuNPs are confirmed by the transmission electron microscopy (TEM) study which divulged the presence of triangular plate, hexagonal, quasi spherical, isosceles trapezoid and truncated triangular morphologies of the AuNPs with an average size of 12.5 nm.
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