DNA-embedded Au/Ag core–shell nanoparticles

Lim, Dong Kwon; Kim, In Jung; Nam, Jwa Min

doi:10.1039/b810195g

Cited by 97 publications

(89 citation statements)

References 26 publications

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“…Hydroquinone has a weak redox potential (E° = −0.7 V vs. NHE) [41], and is therefore unable to reduce the Ag [42,43]. Furthermore, Lim et al have recently reported the successful formation of an Ag shell layer on Au core NPs using hydroquinone as the reducing agent [44]. On the basis of these results and previous reports, it is proposed that Au core -Ag shell bimetallic NPs, as shown in Figure 1(d), were successfully synthesized on the surfaces of ZnO whiskers via a multi-step process.…”

Section: Auagnps Synthesis On the Zno Whiskersmentioning

confidence: 99%

In Situ Synthesis of Bimetallic Hybrid Nanocatalysts on a Paper-Structured Matrix for Catalytic Applications

2011

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Bimetallic nanoparticles have attracted significant attention as their electrochemical and catalytic properties being superior to those of the individual component nanoparticles. In this study, gold-silver hybrid nanoparticles (AuAgNPs) with an Au core -Ag shell nanostructure were successfully synthesized on zinc oxide (ZnO) whiskers. The as-prepared nanocatalyst, denoted AuAgNPs @ ZnO whisker, exhibits an excellent catalytic efficiency in the aqueous reduction of 4-nitrophenol to 4-aminophenol; the turnover frequency was up to 40 times higher than that of each component nanoparticle. Their unique features were attributed to the electronic ligand effect at the bimetallic interface. In addition, the AuAgNPs were synthesized on a ZnO whisker-containing paper with a fiber-network microstructure, which was prepared via a papermaking technique. The paper-structured AuAgNPs composite possessed both a paper-like practical utility and a good catalytic performance. Furthermore, the on-paper synthesis process for these bimetallic nanocatalysts is facile. These easy-to-handle nanocatalyst hybrid composites are expected to find a wide range of applications in various chemical and catalytic processes.

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Section: Auagnps Synthesis On the Zno Whiskersmentioning

confidence: 99%

In Situ Synthesis of Bimetallic Hybrid Nanocatalysts on a Paper-Structured Matrix for Catalytic Applications

2011

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“…[17,18] Additionally, hydroquinone has also been used to grow thin silver shells on gold nanoparticles as a means to amplify their scattering properties, but this was restricted to very thin shells on small spherical particles. [19,20] However, we demonstrate here that these processes can be utilized in a much more controlled manner, thus allowing exquisite morphology control. Based on our previous experience on the reshaping of single-crystal gold nanorods into octahedrons, [21] we decided to explore the coating of the same type of nanorods with silver, so as to tune the morphology of the resulting core-shell particles.…”

mentioning

confidence: 95%

Rapid Epitaxial Growth of Ag on Au Nanoparticles: From Au Nanorods to Core–Shell Au@Ag Octahedrons

Sánchez‐Iglesias

Carbó‐Argibay

Glaria

et al. 2010

Chemistry A European J

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The strongly shape-dependent optical properties of metal nanoparticles have motivated the rapid development of new and efficient strategies toward morphology control. [1][2][3] However, a highly efficient control over shape and size has been mainly achieved for gold. Therefore, an interesting route toward the production of other metal nanoparticles with tailored morphology would be the use of pre-formed gold nanocrystals as templates, on which other metals could be grown. This would allow not only a tight control over the growth, and morphology of the nanocrystals, but also an interesting enhancement of the functionality of such nanomaterials, [4][5][6][7][8] the properties of which would differ from those found in similar nanostructures made of the individual constituent metals. [4][5][6][7][8][9][10][11] In particular, various approaches have been developed to fabricate Au@Ag core-shell nanoparticles by the epitaxial growth of Ag on preformed Au nanoparticles, which were in general based on either chemical or photoinduced reduction processes. [5,9,10,12] The former often make use of a weak reducing agent, such as ascorbic acid or hydroxylamine, so that the reduction takes place exclusively on the surface of the metallic seed particles, which act as catalysts. [9,[13][14][15][16]34] However, this can only be achieved within a narrow pH range so that homogeneous nucleation of Ag nanoparticles in solution is avoided.Herein, we describe a simple and rapid method to grow silver on single-crystal Au nanorods, resulting in single-crystal core-shell Au@Ag nanoparticles with tailored morphology, ranging from nanorods all the way to spheres, through octahedrons, and thereby giving rise to a remarkable control over the optical response spanning the whole visible range and into the near IR.The growth method is based on the use of hydroquinone as reducing agent. Although the preparation of silver nanoparticles using hydroquinone has been previously reported, this typically resulted in a rather poor control over shape and size. [17,18] Additionally, hydroquinone has also been used to grow thin silver shells on gold nanoparticles as a means to amplify their scattering properties, but this was restricted to very thin shells on small spherical particles. [19,20] However, we demonstrate here that these processes can be utilized in a much more controlled manner, thus allowing exquisite morphology control. Based on our previous experience on the reshaping of single-crystal gold nanorods into octahedrons, [21] we decided to explore the coating of the same type of nanorods with silver, so as to tune the morphology of the resulting core-shell particles. Interestingly, we found that silver grows preferentially on the lateral facets of the Au nanorods, so that, indeed complete reshaping of the initial rods into Au@Ag octahedrons and even spheres was achieved, which might be related to the prior capping agent exchange from cetyltrimethylammonium bromide (CTAB) to methoxy-poly(ethylene glycol)-thiol (mPEG-SH). Detailed analysis of the op...

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“…The more ligand added, the rougher surface the Au nanoshell presents (Figure 2e and 2f). The phenomenon can be explained by the theory reported in our previous paper: the strong binding property of 4 MBA in this system forces selective deposition of Au at the ligand-deficient interface between Au NSs and PSPAA domain to form dense Au nanoworms, resulting in the rough surface [28][29][30].…”

Section: Scheme 1 Schematics Showing a General Methods For Growingmentioning

confidence: 99%

General Encapsulation of Core-Shell Nanoparticles by Metal Nanoshell in Colloids

Song¹,

Liu²,

Liu³

et al. 2017

Nano Res Appl

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We demonstrate the use of Au@PSPAA core-shell nanoparticles as seeds to grow metal nanoshell in colloidal system which is a facile and general method. The shell thickness and roughness were controlled by several factors, such as the type of surfactant, the ligand concentration, the quantity of the precursor, and the type of reducing agent. Different kinds of metal nanoshell encapsulation hase been achieved in colloidal system which is critical to its further optial perperties study. We believe that the present method could be applied to fabricate/design more complex and anisotropic particles containing multi shells and the relative applications.

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DNA-embedded Au/Ag core–shell nanoparticles

Cited by 97 publications

References 26 publications

In Situ Synthesis of Bimetallic Hybrid Nanocatalysts on a Paper-Structured Matrix for Catalytic Applications

In Situ Synthesis of Bimetallic Hybrid Nanocatalysts on a Paper-Structured Matrix for Catalytic Applications

Rapid Epitaxial Growth of Ag on Au Nanoparticles: From Au Nanorods to Core–Shell Au@Ag Octahedrons

General Encapsulation of Core-Shell Nanoparticles by Metal Nanoshell in Colloids

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