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Microscale Size Triangular Gold Prisms Synthesized Using Bengal Gram Beans (Cicer arietinum L.) Extract and HAuCl4·3H2O: A Green Biogenic Approach

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Single step and completely green room temperature biosynthesis of microscale size triangular gold prisms (∼25 nm thick) using remnant water collected from soaked Bengal gram beans (Cicer arietinum L.) is reported for the first time. Extracellular transport of protein and biomolecules from protein rich gram beans mediate the reduction of aqueous Au3+ ions and direct the growth of triangular prisms. The growth of triangular gold prisms is monitored by UV-vis spectrometer and supported by complementary characterizations using UV-vis/NIR, TEM, EDS, light microscope, XRD, XPS, ATR-FTIR, and ESI-MS. Plausible mechanism for the formation of microscale size triangular gold prisms is discussed. Effect of varying compositions of gram bean extract and aqueous Au3+ solution governing the morphology of the resultant gold particles is also investigated. Procuring the reducing, growth directing, and stabilizing molecules from the remnant water (extract), which normally would have been a kitchen waste, and water as a universal solvent makes it a completely green process displaying both environmental and economic advantages. Furthermore, this biosynthesis approach is simple, green, and an eco-friendly alternative to chemical synthesis of triangular gold prisms with rates comparable to chemical methods.
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Document Type: Research Article

Publication date: December 1, 2006

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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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