Optical Properties in Nanofluids of Gold Nanoparticles in Poly(vinylpyrrolidone)

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Nanofluids of selective visible colors are developed in gold nanoparticles embedded in polymer molecules of polyvinyl pyrrolidone (PVP) in water. A simple HAuCl4 reaction with PVP molecules (a weak reductant) in aqueous solution at 60–70 °C yields the nanofluid in a single process step with an Au3+ → Au caloric reduction. Part of PVP molecules, which binds to a resulting Au-nanoparticle of nascent surfaces, insulates it from the Au3+ species and thus disrupts it to grow further, by immobilizing in the PVP molecules. Varying the 0–1.0 wt% Au-contents (in Au-PVP) tunes effectively the Au-surface plasmon bands (SPR) in Au-core–shell particles in conjunction with the surface PVP molecules. Characteristic SPR absorption band shifts regularly from at 535 nm in 0.05 wt% Au to a value as large as 571 nm upon increasing the Au-content to 1.0 wt%. The SPR band favors emission at ∼440 nm in a core → shell energy transfer in core–shell particles of an exchange coupled system, when irradiating at ∼250 nm in the 5d106s → 5d96sp (Au) interband transition. Electron microscopic images, with the electron diffraction, reveal small Au-crystallites in shapes of cuboids (or bars) of core–shells, with 5–10 nm width (5–15 length), and their clusters of mostly pentagons.
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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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