Preferential End-to-End Assembly of Gold Nanorods by Biotin−Streptavidin Connectors

Caswell, K. K.; Wilson, James N.; Bunz, Uwe H. F.; Murphy, Catherine J.

doi:10.1021/ja037969i

Cited by 675 publications

(656 citation statements)

References 30 publications

(43 reference statements)

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“…An interesting observation from the calculated near-field distribution is that electromagnetic energy transfers into the surrounding medium, mainly at the nanowire ends, or "hot spots," which are similar to those observed in a previous report (28,29). It is proposed that the DNA molecules are mostly attached to the two ends of the nanowire because of charging effect at the metal point (30,31). However, compared to an Ag nanowire, a silver nanosphere shows a homogeneously enhanced electric field around it (Fig.…”

Section: Resultssupporting

confidence: 80%

Using silver nanowire antennas to enhance the conversion efficiency of photoresponsive DNA nanomotors

Yuan

Zhang²,

Chen³

et al. 2011

Proc. Natl. Acad. Sci. U.S.A.

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Plasmonic near-field coupling can induce the enhancement of photoresponsive processes by metal nanoparticles. Advances in nanostructured metal synthesis and theoretical modeling have kept surface plasmons in the spotlight. Previous efforts have resulted in significant intensity enhancement of organic dyes and quantum dots and increased absorption efficiency of optical materials used in solar cells. Here, we report that silver nanostructures can enhance the conversion efficiency of an interesting type of photosensitive DNA nanomotor through coupling with incorporated azobenzene moieties. Spectral overlap between the azobenzene absorption band and plasmonic resonances of silver nanowires increases light absorption of photon-sensitive DNA motor molecules, leading to 85% close-open conversion efficiency. The experimental results are consistent with our theoretical calculations of the electric field distribution. This enhanced conversion of DNA nanomotors holds promise for the development of new types of molecular nanodevices for light manipulative processes and solar energy harvesting.energy conversion | localized surface plasmon | photo-driven nanomotor P lants harvest solar energy by photosynthesis, in which photosensitive biomolecules absorb energy from sunlight and convert it into chemical energy. Human beings utilize solar energy by fossil fuels, solar thermal systems, and, most frequently nowadays, by photovoltaic systems based on optoelectric materials (1). The design of new synthetic materials coupled with a mechanism to capture, convert, and store photon energy will provide new ways to utilize solar energy (2, 3). However, achieving high conversion efficiency remains a challenge in such energy conversion systems.Recently, DNA has received attention in material sciences, especially for the fabrication of nanomachines able to perform nanoscale movements in response to external stimuli (4-11). Experimental and theoretical studies on single DNA nanomachines have led to the development of new energy conversion strategies (12, 13). As one of the most popular phototransformable molecules, azobenzene and its derivatives can change the overall structure by cis-trans isomerisation mechanism. Using the photoisomerization of azobenzene to photo-regulate DNA hybridization, (14) we have designed a single-molecule light-driven DNA nanomotor (15) for the continuous production of energy in the form of mechanical work. This photon-fueled nanomotor is simple and easy to operate, promising a unique approach to harvest photonic energy. Herein, azobenzene derivatives act as element for energy absorption and DNA molecules movement act for mechanical energy export. As we know, solar thermal technology is a technology to harvest solar thermal energy that converts solar energy to movement of molecules and then produces heat caused by molecule thermal moving. In our design, solar energy is converted to close-open movement of DNA molecules. However, few DNA motor molecules can undergo the close-open conversion as a result of the low p...

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Section: Resultssupporting

confidence: 80%

Using silver nanowire antennas to enhance the conversion efficiency of photoresponsive DNA nanomotors

Yuan

Zhang²,

Chen³

et al. 2011

Proc. Natl. Acad. Sci. U.S.A.

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“…By judicious selection of linker molecules, the bonding direction of gold nanorods can be controlled to form directional nanodimers and, as has been demonstrated recently, chiral plasmonic structures 18 . Nevertheless, all previously reported nanorod assemblies, in general, tend to aggregate and align side by side or end to end as a consequence of maximized interparticle interaction and minimized surface energy, and there is no controlled structural selection with a longitudinal symmetry-breaking phenomenon [19][20][21] . To create the asymmetrically coupled metallic dimers with a longitudinal offset, we first synthesized colloidal gold nanorods with a seed-mediated growth method 22 and uniquely assembled the nanorods anisotropically at a water-chloroform interface (Fig.…”

mentioning

confidence: 99%

Feedback-driven self-assembly of symmetry-breaking optical metamaterials in solution

Yang

Yin

et al. 2014

Nature Nanotech

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Thermodynamically driven self-assembly offers a direct route to organize individual nanoscopic components into threedimensional structures over a large scale [1][2][3] . The most thermodynamically favourable configurations, however, may not be ideal for some applications. In plasmonics, for instance, nanophotonic constructs with non-trivial broken symmetries can display optical properties of interest, such as Fano resonance, but are usually not thermodynamically favoured 4 . Here, we present a self-assembly route with a feedback mechanism for the bottom-up synthesis of a new class of symmetry-breaking optical metamaterials. We self-assemble plasmonic nanorod dimers with a longitudinal offset that determines the degree of symmetry breaking and its electromagnetic response. The clear difference in plasmonic resonance profiles of nanorod dimers in different configurations enables high spectra selectivity. On the basis of this plasmonic signature, our self-assembly route with feedback mechanism promotes the assembly of desired metamaterial structures through selective excitation and photothermal disassembly of unwanted assemblies in solution. In this fashion, our method can selectively reconfigure and homogenize the properties of the dimer, leading to highly monodispersed aqueous metamaterials with tailored symmetries and electromagnetic responses.In the last decade, control over structural symmetries has led to novel materials properties and the prediction of potentially exciting applications. Optical metamaterials 5 , unlike conventional materials, can be designed to have negative refraction, rainbow trapping and nonlinear metal optics. However, particularly rich and exciting physics comes into play when symmetry-breaking mechanisms are introduced that have the potential to enable strong anisotropic plasmon hybridization 6 , leading to unusual phenomena including plasmon-induced transparency 7 , anti-Hermitian plasmonic antennas 8 and optical magnetism, and consequently negative-index metamaterials 9 . These intriguing properties can be used in a number of important applications, such as subwavelength imaging, optical cloaking and sensing [10][11][12] . These applications could be hindered by the fact that most structures are fabricated predominantly by top-down lithography, a technique that is inefficient for producing isotropic metamaterials in three dimensions and is often not cost-effective for large-scale fabrication. To mitigate these limitations, self-assembly approaches have recently been explored. However, they generate the most thermodynamically favourable structure, which usually results in a high degree of structural symmetry and inevitable inhomogeneity. For example, such self-assembly methods have been used to synthesize symmetric coupled plasmonic nanoclusters on a substrate 13 . Very recently, assisted by DNA or polystyrene-particle scaffolds, a circular dichroic plasmonic cluster and optical metafluid with high symmetry have also been reported 14,15

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“…S3. As the GNR is stabilized by cetyltrimethylammonium bromide (CTAB) 23,24 , which preferentially binds to the side surface rather than both ends owing to the size of its head group 25 , the local density of CTAB on the side is assumed to be much greater than that on the ends. Although the number of CTAB layers on the GNR surface may differ in water and oleic acid, it is assumed that this has a negligible effect on the interfacial tension.…”

Section: Resultsmentioning

confidence: 99%

Interfacial liquid-state surface-enhanced Raman spectroscopy

et al. 2013

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Oriented assemblies of functional nanoparticles, with the aid of external physical and chemical driving forces, have been prepared on two-dimensional solid substrates. It is challengeable, however, to achieve three-dimensional assembly directly in solution, owing to thermal fluctuations and free diffusion. Here we describe the self-orientation of gold nanorods at an immiscible liquid interface (that is, oleic acid-water) and exploit this novel phenomenon to create a substrate-free interfacial liquid-state surface-enhanced Raman spectroscopy. Dark-field imaging and Raman scattering results reveal that gold nanorods spontaneously adopt a vertical orientation at an oleic acid-water interface in a stable trapping mode, which is in good agreement with simulation results. The spontaneous vertical alignment of gold nanorods at the interface allows one to accomplish significant additional amplification of the Raman signal, which is up to three to four orders of magnitude higher than that from a solution of randomly oriented gold nanorods.

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Preferential End-to-End Assembly of Gold Nanorods by Biotin−Streptavidin Connectors

Cited by 675 publications

References 30 publications

Using silver nanowire antennas to enhance the conversion efficiency of photoresponsive DNA nanomotors

Using silver nanowire antennas to enhance the conversion efficiency of photoresponsive DNA nanomotors

Feedback-driven self-assembly of symmetry-breaking optical metamaterials in solution

Interfacial liquid-state surface-enhanced Raman spectroscopy

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