Size and Shape Homogenization of Ag Nanoparticles by Laser Irradiation

Lim, Jonghui; Lee, Sung-Woon; Yoon, Sangwoon

doi:10.5012/bkcs.2011.32.11.4113

Bulletin of the Korean Chemical Society

2011

DOI: 10.5012/bkcs.2011.32.11.4113

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Size and Shape Homogenization of Ag Nanoparticles by Laser Irradiation

Jonghui Lim¹,

Sung-Woon Lee²,

Sangwoon Yoon³

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2013

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Cited by 1 publication

(2 citation statements)

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“…[1][2][3][4][5] In particular, gold nanoparticles have received a great attention due to their usefulness in optical, chemical, and biological applications.…”

mentioning

confidence: 99%

“…[1][2][3][4][5] In particular, gold nanoparticles have received a great attention due to their usefulness in optical, chemical, and biological applications. 3,[6][7][8][9] Various shapes of gold nanoparticles, such as cubes, octahedrons, rods, and branched multipods have been prepared in a high yield using seed-mediated method which provides better control over the shape and size distribution of the nanoparticles.…”

mentioning

confidence: 99%

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Shape Transformation of Gold Nanoparticles from Octahedron to Cube Depending on in situ Seed-Growth Time

Kim¹,

Park²,

Han³

et al. 2013

Bulletin of the Korean Chemical Society

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Synthesis of shape-controlled metal nanoparticles has been intensively studied due to their shape-dependent material properties. [1][2][3][4][5] In particular, gold nanoparticles have received a great attention due to their usefulness in optical, chemical, and biological applications.3,6-9 Various shapes of gold nanoparticles, such as cubes, octahedrons, rods, and branched multipods have been prepared in a high yield using seed-mediated method which provides better control over the shape and size distribution of the nanoparticles. 10-17In this study, we report on the observation that the particle shape was dependent upon in situ seed-growth time of our one pot synthesis of gold nanoparticles. It was found that the cube yield increased with the increase of the seed-growth time while a short seed-growth time (~15 min) resulted in the formation of high-yield octahedral particles. This can also be regarded as a simple and convenient method of synthesizing octahedral and cubic gold nanoparticles in aqueous solution. Although the synthetic methods using cetyltrimethylammonium bromide (CTAB) and ascorbic acid have been previously reported, the shape control of gold nanoparticles relied on the adjustment of the concentration of reducing agent, gold precursor, activators, or seed particles. In this report, shape of gold nanoparticles was controlled by tuning only one parameter, the in situ seed-growth time, without any variation in reactant concentrations or in the way of a separate seeding.Typically, a 250 μL of 10 mM HAuCl 4 ·3H 2 O solution was added to a 20 mL of 10 mM CTAB aqueous solution. After the solution was gently mixed, 100 μL of 100 mM L-ascorbic acid was added to this solution and mixed thoroughly. The color of the resulting solution changed from yellow to colorless and the mixture was left to stand for 30 min to reduce Au 3+ to Au + sufficiently and then 30 μL of 100 mM NaOH was carefully injected to the bottom of the reaction vessel. The mixtures were left undisturbed for seed particles to form and grow for different periods of time (in situ seedgrowth time). The solutions were then mixed thoroughly after the period of time.As shown in Figure 1, the seed-growth time influenced the shape of gold nanoparticles. It is well-known that the interaction between the faceting tendency of the stabilizing agent and the rate of Au 0 supply to the crystallographic planes is important for the formation of various shapes.14 Generally, the shape control of nanoparticles of an fcc crystal is related to their surface energies associated with different facets which increase in the order of γ {111} < γ {100} < γ {110} .2 However, stabilizing agent can interact selectively with different metal crystal facets and alter their surface energies. In case of CTAB, it prefers the {100} facets to the {111} facets.As described before, gold nanoparticles were synthesized by mixing an aqueous solution of HAuCl 4 , CTAB, and ascorbic acid, followed by the addition of NaOH into the reaction mixture. NaOH was added into the reaction mixtur...

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“…[1][2][3][4][5] In particular, gold nanoparticles have received a great attention due to their usefulness in optical, chemical, and biological applications.…”

mentioning

confidence: 99%

mentioning

confidence: 99%

Shape Transformation of Gold Nanoparticles from Octahedron to Cube Depending on in situ Seed-Growth Time

Kim¹,

Park²,

Han³

et al. 2013

Bulletin of the Korean Chemical Society

View full text Add to dashboard Cite

show abstract

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Size and Shape Homogenization of Ag Nanoparticles by Laser Irradiation

Cited by 1 publication

References 20 publications

Shape Transformation of Gold Nanoparticles from Octahedron to Cube Depending on in situ Seed-Growth Time

Shape Transformation of Gold Nanoparticles from Octahedron to Cube Depending on in situ Seed-Growth Time

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