I have synthesised what I thought were gold-silver alloys at various different compositions. The UV/vis data showed that nanoparticles alloys with a majority of the composition made from gold had one plasmon band, indicating they were alloys. However with nanoparticle alloys where the composition is mainly silver, the UV/vis data shows two plasmon bands, indicating the presence of segregated gold and silver nanoparticles which are not alloyed.

Could anyone explain why this has happened?

  • $\begingroup$ From a phase diagram perspective there isn’t a good one. I’d contemplate the nanoparticle growth process and how a silver rich vs gold rich particle forms. $\endgroup$ – Jon Custer Mar 13 '19 at 2:07
  • $\begingroup$ Can you add how you made the particles. It would be helpful to know if you did a simultaneous reduction and with what materials. $\endgroup$ – A.K. Mar 13 '19 at 20:44
  • $\begingroup$ Yes I carried out a simultaneous reduction using sodium borohydride, the stabilizing agent is PDADMAC $\endgroup$ – The Free Radical Mar 13 '19 at 22:03
  • $\begingroup$ I do intent to answer this just need to find a particular paper first. $\endgroup$ – A.K. Mar 20 '19 at 0:30

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