A “Nanonecklace” Synthesized from Monofunctionalized Gold Nanoparticles

Dai, Qinggang; Worden, James G.; Trullinger, Jonathan; Huo, Qun

doi:10.1021/ja042610v

Cited by 83 publications

(91 citation statements)

References 16 publications

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“…It should be noted that these ring-like structures are two-dimension pictures but the Au particles are actually formed in a spherical shell in three dimensions. These shapes are very similar to that formed by the covalent X. Chen et al attachment of gold nanoparticles to a polylysine backbone followed by ring closure of polylysine chains, [9] but they have been formed by a completely different mechanism. In the present case, the ring-like composites are considered to comprise a PS core, a hybrid gold and P4VP middle layer (inner shell), and a PEO corona.…”

Section: Core-shell-corona Au-micelle Compositessupporting

confidence: 51%

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Novel Structured Composites Formed from Gold Nanoparticles and Diblock Copolymers

Chen

Liu

et al. 2007

Macromol. Rapid Commun.

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We report a simple procedure to prepare a novel Au‐micelle composite with a core‐shell‐corona structure. This composite is prepared by reduction of tetrachloroauric acid (HAuCl4 · 3H2O) in dilute aqueous solution containing polystyrene‐block‐poly(4‐vinylpyridine) micelles and poly(ethylene oxide)‐block‐poly(4‐vinylpyridine) copolymers. The micelles with a polystyrene core and a poly(4‐vinylpyridine) shell are transformed into Au‐micelle composites with a polystyrene core, a swollen hybrid Au/poly(4‐vinylpyridine) inner shell, and a poly(ethylene oxide) corona by direct physisorption of gold particles with poly(4‐vinylpyridine) chains.magnified image

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Section: Core-shell-corona Au-micelle Compositessupporting

confidence: 51%

“…the core and gold nanoparticles located in the shell, [6b] and a gold-polymer chain formed by linking gold nanoparticles onto a polymer chain through covalent bonding, [9] etc.…”

Section: Communicationmentioning

confidence: 99%

Novel Structured Composites Formed from Gold Nanoparticles and Diblock Copolymers

Chen

Liu

et al. 2007

Macromol. Rapid Commun.

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“…[1][2][3][4][5][6] Hence, over the past decade many research groups have focused on controlling the shape of inorganic nanostructures, [7][8][9][10][11][12] and many low-symmetry nanocrystals have been produced. [13][14][15][16][17][18][19][20] In this respect, one-dimensional structures are particularly interesting objects whose optical and catalytic properties strongly depend on their shape anisometry.…”

mentioning

confidence: 99%

Polymer‐Functionalized Platinum‐On‐Gold Bimetallic Nanorods

Khanal

Zubarev

2009

Angew Chem Int Ed

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Physical and chemical properties of nanosized crystals are known to be a function of their size, morphology, and chemical composition. [1][2][3][4][5][6] Hence, over the past decade many research groups have focused on controlling the shape of inorganic nanostructures, [7][8][9][10][11][12] and many low-symmetry nanocrystals have been produced. [13][14][15][16][17][18][19][20] In this respect, one-dimensional structures are particularly interesting objects whose optical and catalytic properties strongly depend on their shape anisometry. [14][15][16][17] This unique feature of metallic nanorods has already found several applications in nanotechnology [21] and biomedical research. [22,23] Moreover, four examples of bimetallic nanorods [24][25][26][27] have been described in the last few years. It is believed that bimetallic platinum-on-gold and palladium-on-gold nanostructures may open a new direction in the area of catalysis. [28][29][30] However, all bimetallic nanorods reported to date are only soluble in water and therefore cannot catalyze any reactions in organic solvents. In fact, there are no examples of any platinum or palladium nanostructures covalently functionalized with polymer chains, which could render them soluble in organic media. Herein we describe the first example of polymer-functionalized platinum-on-gold nanostructures. We use gold nanorods as templates and demonstrate how a polycrystalline continuous shell of platinum can be deposited on their surface and subsequently functionalized with organic molecules. In addition, we provide conclusive evidence of the functionalization of the platinum shell by direct visualization of the polymer surface layer by electron microscopy and its detection by 1 H NMR spectroscopy.The seed-mediated method developed by Murphy and coworkers [1] and later modified by El-Sayed and Nikoobakht [2] produces single-crystalline gold nanorods (Au NRs). However, the conversion of Au I ions to Au 0 in this method is only 10-15 %, [31] and the majority of ions remains in solution after the growth of Au NRs is complete. Our systematic studies revealed that the amount of ascorbic acid used for the reduction of Au I ions is critically important, and addition of 10 mol % ascorbic acid after completed nanorod growth makes their size distribution much narrower. Figure 1 a shows a representative TEM image of Au NRs prepared by this modified method. The analysis of 250 nanorods shown in Figure 1 a revealed that their average length and width measure 52.8 and 11.4 nm, respectively, and the standard deviation (SD) for both dimensions is less than 9 %. These results represents a significant improvement in comparison with Au nanorods prepared under the standard conditions (SD % 20 %). [1,2] Further introduction of ascorbic acid allows conversion of Au I ions remaining in the growth solution into metallic gold and its deposition onto the surface of Au NRs.[32] However, this rapid addition of ascorbic acid results in a nonuniform deposition of gold, and the shape of the nanorods changes to...

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“…Modification reactions include polymerizations, [213][214][215][216] coupling reactions, 40,48,[217][218][219][220][221] or transformation of an existing chemical moiety. 48,[222][223][224] In all cases, the success of such modifications relies not only on the nanoparticles' tolerance for various reaction conditions but also on the overall reactivity and steric environment presented by functional groups that are constrained through binding to a nanoparticle. Factors that impact the efficacy of postsynthetic modifications may include the following: the length of the ligand composing the stabilizing shell, since this impacts the steric mobility of ω-functional groups, the spatial density of such groups, and the bulk of the incoming nucleophile (for S N 2 type reactions).…”

Section: Postsynthetic Modification Of the Ligand Shellmentioning

confidence: 99%

“…274 Huo reported the formation of such an extended structure resulting from peptide coupling reactions between gold nanoparticles with several pendant carboxylate groups and the primary amines of polylysine. 222 Leibowitz brought 2 and 5 nm gold particles together by introducing various disulfides in solution. 275 Biomolecules such as DNA and thiolated oligonucleotides have been used as nanoparticle linkers, taking advantage of complementary binding between single stranded derivatives 251,[276][277][278] or by using DNA as a spacer molecule to control the distance between linked particles.…”

Section: Assembly Of Extended Nanoparticle-based Arrays In Solutionmentioning

confidence: 99%