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Plasmonics

, Volume 1, Issue 2–4, pp 121–127 | Cite as

Gold Nanoparticles from Induced Au3+→Au0 Reaction in Polyvinyl Alcohol Molecules in Presence of Sucrose in Hot Water

  • P. Tripathy
  • S. RamEmail author
  • H. J.-Fecht
Article

Abstract

In hot water (50–60°C), polyvinyl alcohol (PVA) molecules have coordination reaction with Au3+ cations, forming an Au3+-PVA polymer complex. In the proposed model reaction in small templates, the complex converts to Au0 capping in PVA molecules. Adding sucrose (5–10 times the PVA in mass) in a typical batch promotes Au3+→Au0 reaction, showing absorption coefficient α in Au0 surface plasmon band to be enhanced as much as 28 times the value in reaction with PVA. The band shifts at 547 nm from 566 nm (α  =  21.4 cm−1 mol−1) in the PVA sample. Drying Au0-PVA/sucrose (2–5 wt% Au0) colloid at 60–70°C and then heating at 450°C in air burns off the organic part, leaving behind a light ash colored powder with Au0 nanoprisms or nanofibrils (∼30 nm average width). X-ray diffractogram has six reflections, (111), (200), (220), (311), (222), and (400), of Fm3m fcc Au0 of lattice parameter a  =  0.4080 nm. The powder has photoluminescence in transversal and longitudinal Au0 plasmon bands of 535 and 585 nm, respectively.

Keywords

Gold nanoparticles Nanocomposite Nanocolloids Luminescence Gold modified polymer Synthesis of gold nanoparticles 

Notes

Acknowledgments

This work was supported in part by the University Grant Commission (UGC) and the Ministry of the Human Resource and Development (MHRD), Government of India.

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Copyright information

© Springer Science+Business Media, LLC 2006

Authors and Affiliations

  1. 1.Materials Science CentreIndian Institute of TechnologyKharagpurIndia
  2. 2.Werkstoffe der ElektrotechnikUniversität UlmUlmGermany

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