A Novel Ultraviolet Irradiation Technique for Shape-Controlled Synthesis of Gold Nanoparticles at Room Temperature

Zhou, Yuhao; Wang, C. Y.; Zhu, Yongchun; Chen, Z. Y.

doi:10.1021/cm990315h

Cited by 265 publications

(133 citation statements)

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“…Among these, the photoreduction method is widely adopted as one can easily obtain very stable nanocomposites by this method. Also, there are reports of obtaining special-shaped nanoparticles [24] other than spherical, with the help of this method. In this article, we explore optical transport (viz.…”

Section: Introductionmentioning

confidence: 99%

“…Out of these, PVA is used extensively as host matrix as it is water soluble, optically transparent and gives homogeneity to the silver nano dispersion. The existing methods to reduce silver nitrate in PVA matrix are numerous, to name some simple chemical reduction [19] [23,24]. Among these, the photoreduction method is widely adopted as one can easily obtain very stable nanocomposites by this method.…”

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confidence: 99%

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Negative photoconductivity in silver nanocubes prepared by simple photochemical method

Deb

Sarkar

2012

Journal of Experimental Nanoscience

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Silver nanocubes embedded in polyvinyl alcohol matrix have been synthesised by photoirradiation technique. The composite films are characterised by FESEM, XRD, UV-Visible absorption and photoluminescence. These show characteristics of silver nanoparticles with FESEM showing the cubic shape. The photoconductivity study of these films shows decrease in photocurrent with light irradiation. Such negative photoconductivity behaviour may be attributed to dominant scattering of electrons by excited surface plasmon polaritons in nanoscale.Keywords: silver nanoparticles; surface plasmon resonance; photoluminescence; polymer composite; polaritons IntroductionIn metal nanostructures, interesting phenomena [1-3] are exhibited due to surface plasmon polariton (SPP) [4]. Though SPP has capacity to have application potential in both photonics and microelctronics, most of the studies focussed on the optical properties [5][6][7]. Relatively less attention has been paid to the transport properties. Amongst the metals, noble metal (Ag, Au, Pt) nano-sized particles have drawn much attention for their unique electrical and optical properties dependent on their size and shape [8][9][10][11]. In most cases, silver nanoparticles can be obtained by reduction of silver nitrate. Also, to retain their nanosize, one often prepares nanocomposites by embedding the nanoparticles in glass [12], silica [13] or polymers [14][15][16][17][18] such as polyvinyl alcohol (PVA), polyacrilic acid or polymethyl methacrylate, etc. Out of these, PVA is used extensively as host matrix as it is water soluble, optically transparent and gives homogeneity to the silver nano dispersion. The existing methods to reduce silver nitrate in PVA matrix are numerous, to name some simple chemical reduction [19] [23,24]. Among these, the photoreduction method is widely adopted as one can easily obtain very stable nanocomposites by this method. Also, there are reports of obtaining special-shaped nanoparticles [24] other than spherical, with the help of this method. In this article, we explore optical transport (viz. photoconductivity) of cubic silver nano particles embedded in PVA along with their routine characterisation.

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Negative photoconductivity in silver nanocubes prepared by simple photochemical method

Deb

Sarkar

2012

Journal of Experimental Nanoscience

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“…The surfactant, SDS as well as the counter ion, anilinium ion are hydrophobic in nature, which gets adsorbed preferentially at different faces of the particles thereby leading to a growth process at specific direction. Such anisotropic growth preferential adsorption has been observed in the synthesis of many other materials [56,57].…”

Section: Resultsmentioning

confidence: 57%

Micelle assisted morphological evolution of silver nanoparticles

Chaudhari

Haram

Kulshreshtha

et al. 2007

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…Therefore, it could be served as a qualied substrate for investigating the distribution of enhancement effect in the gap area for the highly uniform SERS effect it brought. carefully analyzing the SAED pattern, one can conclude unambiguously that the diffraction pattern well ts the structure of (111) crystal face, 39 which further demonstrates that the GSCPs only contain (111) crystal faces. Fig.…”

Section: Resultsmentioning

confidence: 78%

Insights into the heterogeneous distribution of SERS effect in plasmonic hot spots between Au@SiO₂monolayer film and gold single crystal plates

Wei

Zhang

et al. 2017

RSC Adv.

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Plasmonic hot spots, capable of confining strong electromagnetic fields near metallic surfaces, are particularly essential to a variety of enhanced spectroscopic techniques. Understanding the electric field distributions in the hot spot plays a crucial role in controlling the fabrication of plasmonic nanostructures for a variety of plasmon-based applications. The investigation of plasmonic hot spots in metallic nanosystems has not been fully evaluated. Here, we develop a facile approach by experimental means for investigating the distribution of plasmonic hot spots in surface-enhanced Raman spectroscopy (SERS) based on the dual-probe strategy by coupling a p-mercaptobenzoic acid-embedded Au@SiO 2 ((AupMBA)@SiO 2 ) nanoparticle monolayer film with thiophenol-modified gold single crystal plates (TPGSCPs). We demonstrated, for the first time, the heterogeneous distribution of SERS effect in the gap between Au@SiO 2 monolayer film and GSCPs. As increasing the gap distance by changing the thickness of silica spacer, the SERS effect of the probe on the gold nanoparticles decayed with a slower rate than that of the other probe attached onto the GSCPs. It mainly originated from the difference of localized dielectric environments and curvatures. By deliberately controlling the silica shell thickness, the switchable plasmonic coupling effect can be achieved between "particle-particle" gap mode and "particle-surface" gap mode. The results reveal that the transfer effect is more evident for (Au-pMBA) @SiO 2 films with thinner silica shell thickness and for 785 nm illumination as excitation wavelength than 633 nm. Moreover, the introduction of NaOH solution to (Au-pMBA)@SiO 2 films leads to the transfer of the hot spots to the areas between neighboring nanoparticles again due to the removal and dissolution of silica shells. The understanding gained from our experimental observation provides keen insight into the plasmonic hot spots in coupled nanostructures, offering guidance for rational design of plasmonic substrates for ultrasensitive SERS detections.

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A Novel Ultraviolet Irradiation Technique for Shape-Controlled Synthesis of Gold Nanoparticles at Room Temperature

Cited by 265 publications

References 24 publications

Negative photoconductivity in silver nanocubes prepared by simple photochemical method

Negative photoconductivity in silver nanocubes prepared by simple photochemical method

Micelle assisted morphological evolution of silver nanoparticles

Insights into the heterogeneous distribution of SERS effect in plasmonic hot spots between Au@SiO₂monolayer film and gold single crystal plates

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A Novel Ultraviolet Irradiation Technique for Shape-Controlled Synthesis of Gold Nanoparticles at Room Temperature

Cited by 265 publications

References 24 publications

Negative photoconductivity in silver nanocubes prepared by simple photochemical method

Negative photoconductivity in silver nanocubes prepared by simple photochemical method

Micelle assisted morphological evolution of silver nanoparticles

Insights into the heterogeneous distribution of SERS effect in plasmonic hot spots between Au@SiO2monolayer film and gold single crystal plates

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Insights into the heterogeneous distribution of SERS effect in plasmonic hot spots between Au@SiO₂monolayer film and gold single crystal plates