2004
DOI: 10.1021/la049172q
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Synthesis of Highly Faceted Pentagonal- and Hexagonal-Shaped Gold Nanoparticles with Controlled Sizes by Sodium Dodecyl Sulfate

Abstract: We report the synthesis of pentagonal- and hexagonal-shaped gold nanoparticles with controlled diameters ranging from 5 to 50 nm. These nanoparticles were prepared by a seeding growth approach. Sodium dodecyl sulfate (SDS) molecules served as the capping agent to restrict the particle size. In addition, the formation of highly faceted gold nanoparticles may be facilitated by the possibly ineffective capping interactions between the lamellar micellar structures formed by the SDS molecules and the gold nanoparti… Show more

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Cited by 145 publications
(108 citation statements)
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“…This was intended because SDS, an anionic surfactant, may give some contrasts to the AuNP/ITO substrates formed with the cationic surfactant, CTAB. While the seed-mediated growth of AuNPs with SDS has been reported previously in homogeneous solution [19], the present trial shows that the presence of SDS in the growth solution is also valid for fabricating the AuNP/ITO substrates. Hence, the effects of the electron transfer reactions on the AuNP/ITO electrodes prepared with CTAB and SDS are systematically examined and compared by observing the CVs of the oxidation of anionic [Fe(CN) 6 ] 4À and the reduction of cationic [Ru(NH 3 ) 6 ] 3þ in phosphate buffer solutions (PBSs).…”
Section: Introductionsupporting
confidence: 63%
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“…This was intended because SDS, an anionic surfactant, may give some contrasts to the AuNP/ITO substrates formed with the cationic surfactant, CTAB. While the seed-mediated growth of AuNPs with SDS has been reported previously in homogeneous solution [19], the present trial shows that the presence of SDS in the growth solution is also valid for fabricating the AuNP/ITO substrates. Hence, the effects of the electron transfer reactions on the AuNP/ITO electrodes prepared with CTAB and SDS are systematically examined and compared by observing the CVs of the oxidation of anionic [Fe(CN) 6 ] 4À and the reduction of cationic [Ru(NH 3 ) 6 ] 3þ in phosphate buffer solutions (PBSs).…”
Section: Introductionsupporting
confidence: 63%
“…Thus, two possibilities can be considered: that is, (1) the capping of CTAB or SDS is so weak that the electron transfer reactions are scarcely hindered by the surfactants, or (2) the surfactants are no more present as protective shells for AuNPs in the solutions for electrochemical measurements. The previous reports showed the formation of the double layers of CTAB around Au nanorods [18], and ineffective capping of SDS from the formation of pentagonal-and hexagonal-shaped AuNPs [19]. However, the former analysis was performed after separation the Au nanorods from the solution of CTAB.…”
Section: Cyclic Voltammograms Recorded Using the Aunp/ Ito Electrodesmentioning
confidence: 99%
“…67 Both modifications of the iterative seeded growth process strongly favored the growth of nanorods over larger spherical colloids to the extent that spherical particles composed only 0-1% of the nanomaterial products. 68,69 A more exhaustive study describing the impact various types of gold seed particles have on nanorod synthesis was undertaken by Gole and Murphy, comparing particles differing in both their average diameter and surface chemistry. 70 In this work, negatively charged seeds were compared to positively charged seeds (where citrate, mercaptobutylamine, and glucose stabilizers impose a negative charge, and CTABstabilized particles bear an overall positive charge, due to partial bilayer formation).…”
Section: Anisotropic Particles and Nanorodsmentioning
confidence: 99%
“…Figure 1 gives the ultraviolet-visible spectra for the AuNPs and GlcN-AuNPs, and shows a characteristic surface plasmon resonance (SPR) absorption band approximately 520-560 nm, indicating formation of AuNPs. [16][17][18] The AuNPs prepared with chitosan showed an absorption band at 520 nm, and surface functionalization of the AuNPs with glucosamine resulted in a significant shift in the SPR band to approximately 540-560 nm, reflecting a red and blue shift of the spectrum depending on the surface, size, and shape of the nanoparticles. The surface of AuNPs contain collective oscillation of electrons, which are correlated in the electromagnetic field of observing light 19 and this phenomena elucidates the causes of aggregation due to lower concentration of GlcN.…”
Section: Resultsmentioning
confidence: 99%