Journal
TEXTILE RESEARCH JOURNAL
Volume 83, Issue 12, Pages 1229-1235Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/0040517512461697
Keywords
Biosynthesis; nanocomposite; gold; metal nanoparticles; silk fiber; Citrus paradisi
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Funding
- US Department of Agriculture [USDA 2007-1065-01]
- Mexico's National Council for Science and Technology, CONACyT
- National Science Foundation Materials Research Science and Engineering Centers (MRSEC) [DMR 0520404]
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Gold nanostructures were synthesized by reduction of gold ions using aqueous extract of grapefruit pulp (Citrus paradisi). This eco-friendly bioreduction method allows the formation in solution and support of gold nanostructures on silk fibers. Bioreduction techniques involve biomolecules of grapefruit extract for reducing a gold precursor to obtain different kinds of nanostructures. Carbohydrates and organic acids, present in C. paradise, are believed to be responsible for the formation of nanoparticles. Analysis of gold-silk nanocomposites by electron microscopy shows gold nanostructures with quasi-spherical, hexagonal, and triangle shapes. The evolution of functional groups in the silk fibers before and after the bioreduction process was followed by infrared spectroscopy. Diffuse reflectance spectroscopy (DRS) and laser scanning confocal microscopy (LSCM) were used to probe surface plasmon resonance and fluorescent behavior in the silk-gold composite. This simple and novel methodology for obtaining these types of nanocomposite may have important applications in the development of functional fibers.
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