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Seed-Mediated Synthesis of Branched Gold Nanocrystals Derived from the Side Growth of Pentagonal Bipyramids and the Formation of Gold Nanostars

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We report the first synthesis of elongated penta-branched gold nanocrystals with a shape resembling
that of a star fruit but with sharp ends by a seeding growth approach. Cetyltrimethylammonium bromide
(CTAB) capping surfactant was used, and AgNO3 was added to the last growth solution to promote the
formation of the five side branches. Through an investigation of the products collected by adding AgNO3
into first, second, third, or fourth growth solution, the penta-branched nanocrystals were found to be
derived from pentagonal bipyramid-shaped nanocrystals. Side growth over the twin boundaries results in
the formation of five elongated branches with the highest point of each branch bisecting the branch into
two halves. Smaller penta-branched nanocrystals with sizes of 70-110 nm and more fully developed
larger nanocrystals with sizes of 200-350 nm can be readily prepared. The branches possess singlecrystalline
{111} faces. The intermediate products obtained at various time points were examined and
their UV-vis absorption spectra recorded. By replacing CTAB with cetyltrimethylammonium chloride
surfactant, and controlling the concentration of bromide ions in the solution, gold nanostars with five
symmetrical branches and monodispersed sizes of 120-130 nm were synthesized for the first time.

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Informasi Detail

Judul Seri

Chemistry of Materials

No. Panggil

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Penerbit

Washington, DC : American Chemical Society., 2009

Deskripsi Fisik

Chem. Mater. 2009, 21, 110–114

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

Versi lain/terkait

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