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  • synthesis and characterization of ag/au alloy and core(ag)–shell(au) nanoparticles

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 1353
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
      bimetallic silver–gold nanoparticles (nps) with different structures were prepared. namely, silver–gold\ alloy and core(ag)–shell(au) type nanoparticles were synthesized at various ag/au ratios using only sodium citrate as reductant without any stabilizers. the synthesized nps were characterized by different structure analysis methods. the unique optical properties  of these   nps were   studied   by   uv–vis spectroscopy. for ag/au alloy nps theλ max values are linearly tunable from ∼408 nm to 525 nm depending on the composition. the plasmon band of core–shell nps can be shifted to higher wavelengths by depositing a gold shell with increasing thickness. the hrtem images clearly confirm the two different structures of the nps. we found that the size of alloy nanoparticles decrease from d ∼15 nm to d ∼8 nm with the increase in gold content. in contrast, core(ag)–shell(au) type nps with progressively increasing  size (d = 13–16 nm) along with separately formed smaller gold nps were formed.

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