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Kinetics of reaction of gold nanoparticles following partial removal of stabilizers

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Abstract

Citrate-stabilized gold nanoparticles (Au NPs) of 17-nm diameter were allowed to react following partial depletion of the stabilizer using dialysis. Kinetics of the reaction was investigated by following time-dependent changes in the visible extinction spectrum. Thus, surface plasmon resonance peak (SPR) of isolated Au NPs (reactant) at 522 nm decreased, while SPR peak due to product—which was agglomerated Au NPs—occurring at 600 nm increased with time. The reaction followed first-order kinetics with respect to concentration of reactant (Au NP) with a rate constant on the order of (2.10 ± 0.34) × 10−3 min−1. Further, product concentration correspondingly increased with time. Transmission electron microscopy investigation indicated the presence of individual NPs, along with agglomerated structures in the beginning of reaction—the extent of which increased with time, rather than the formation of smaller agglomerates. A model has been proposed based on reaction of individual NPs with agglomerated structures which accounted for the observed kinetics.

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Acknowledgments

AD thanks Jashmini Deka and Rama Ghosh for preliminary help. We also thank the Department of Electronics and Information Technology, Government of India for support (No. 5(9)/2012-NANO (Vol. II)).

Conflict of interest

The authors declare no competing financial interest.

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Author notes

  1. Subhojit Das

    Present address: Department of Chemistry, National Institute of Technology, Agartala, 799046, Tripura, India

Authors and Affiliations

  1. Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, 781039, Assam, India

    Anushree Dutta, Subhojit Das, Anumita Paul & Arun Chattopadhyay

  2. Centre for Nanotechnology, Indian Institute of Technology Guwahati, Guwahati, 781039, Assam, India

    Arun Chattopadhyay

Authors
  1. Anushree Dutta
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  2. Subhojit Das
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  3. Anumita Paul
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  4. Arun Chattopadhyay
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Corresponding authors

Correspondence to Anumita Paul or Arun Chattopadhyay.

Electronic supplementary material

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11051_2015_3021_MOESM1_ESM.pdf

Supporting Information Concentration calculation, additional figures and measurement data pertaining to UV–Vis, TEM and DLS-based methods and mathematical derivation are included in the Supporting Information (SI). Supplementary material 1 (PDF 4260 kb)

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Dutta, A., Das, S., Paul, A. et al. Kinetics of reaction of gold nanoparticles following partial removal of stabilizers. J Nanopart Res 17, 260 (2015). https://doi.org/10.1007/s11051-015-3021-6

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  • DOI: https://doi.org/10.1007/s11051-015-3021-6

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