Polarization-Dependent Confocal Imaging of Individual Ag Nanorods and Nanoparticles

Du, Chao; You, Yu‐Meng; Zhang, XueJin; Kasim, Johnson; Shen, Zexiang

doi:10.1007/s11468-009-9095-1

Cited by 13 publications

(5 citation statements)

References 27 publications

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“…5A. 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).…”

Section: Resultssupporting

confidence: 81%

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: 81%

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.

Self Cite

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“…The evanescent electrical fields near the surface of a Ag nanowire are usually very high, providing capability to enhance Raman scattering 18,19 and fluorescence 20,21 of molecules or emitters (such as quantum dots and upconversion nanocrystals) adjacent to the nanowires. For example, single Ag nanowire, [22][23][24] randomly assembled networks, 25 rafts of Ag nanowires assembled through Langmuir-Blodgett (LB) process 26,27 and bundles of Ag nanowires 28,29 have been evaluated to exhibit significant enhancement on Raman signals of molecules adsorbed on the surfaces of the Ag nanowires. Due to the anisotropic geometry of the Ag nanowires, the measured Raman scattering is strongly dependent on the polarization of excitation light.…”

Section: Yugang Sunmentioning

confidence: 99%

Silver nanowires – unique templates for functional nanostructures

2010

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This feature article reviews the synthesis and application of silver nanowires with the focus on a polyol process that is capable of producing high quality silver nanowires with high yield. The as-synthesized silver nanowires can be used as both physical templates for the synthesis of metal/dielectric core/shell nanowires and chemical templates for the synthesis of metal nanotubes as well as semiconductor nanowires. Typical examples including Ag/SiO(2) coaxial nanocables, single- and multiple-walled nanotubes made of Au-Ag alloy, AgCl nanowires and AgCl/Au core/shell nanowires are discussed in detail to illustrate the versatility of nanostructures derived from silver nanowire templates. Novel properties associated with these one-dimensional nanostructures are also briefly discussed to shed the light on their potential applications in electronics, photonics, optoelectronics, catalysis, and medicine.

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“…Ag nanoparticles (AgNPs) have deserved special attention owing to their fascinating physical and chemical properties [1–4] and, so far, diverse applications of AgNPs have been explored in chemical, catalytic, biological, and other fields [5–8]. Typically, AgNPs present high reactivity and selectivity in a broad range of catalytic reactions.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of silver nanoparticles in electrospun polyacrylonitrile nanofibers using tea polyphenols as the reductant

Zou

Zhu

et al. 2012

Polymer Engineering & Sci

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Uniformly dispersed Ag nanoparticles (AgNPs) with diameter about 5 nm embedded in electrospun polyacrylonitrile (PAN) nanofibers were synthesized by using tea polyphenols (TP) as the reductant. The reducing ability of TP toward Ag ions was characterized by Fourier transform infrared spectroscopy and ultraviolet–visible spectra, and the results revealed that TP exhibit satisfied reducing ability in the synthesis process. Transmission electron microscopy observation showed that the synthesized spherical AgNPs with diameter about 5 nm were immobilized on the surface and in the interior of PAN nanofibers by electrospinning technology. The interactions of Ag with PAN and TP were investigated by X‐ray photoelectron spectroscopy (XPS), and the results suggested that PAN polymer and TP both served as stabilizer during the synthesis of AgNPs because of the chelating interactions of Ag with cyano groups and phenolic hydroxyls. The synthesized AgNPs in PAN nanofibers exhibit good antibacterial property and may be used for antibacterial and catalytic applications. POLYM. ENG. SCI., 2013. © 2012 Society of Plastics Engineers

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Polarization-Dependent Confocal Imaging of Individual Ag Nanorods and Nanoparticles

Cited by 13 publications

References 27 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

Silver nanowires – unique templates for functional nanostructures

Synthesis of silver nanoparticles in electrospun polyacrylonitrile nanofibers using tea polyphenols as the reductant

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