Synthesis and thermal stability of gold nanowires within monolithic mesoporous silica

Kan, Caixia; Cai, Wei; Fu, Guoqiang; Li, C.C.; Zhang, L.D.

doi:10.1007/s00339-003-2202-9

Cited by 7 publications

(4 citation statements)

References 33 publications

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“…2a shows the UVevis absorption spectrum of the AuNRs. Due to the structural anisotropy of the AuNRs, the status of electron oscillation is different in each directions, which thereby result in two unique surface plasmon resonance modes: One is associated with the electron oscillation along the transverse direction of the AuNRs, which is known as transverse surface plasmon resonance (T-SPR) and roughly in the range of 510e530 nm, the other is associated with the electron oscillation along the longitudinal direction of the rods, which called as longitudinal surface plasmon resonance (L-SPR) [32]. The AuNRs are different from Au nanoparticles [27] in that the latter have only one SPR peak.…”

Section: Resultsmentioning

confidence: 99%

Plasmonic enhancement of the performance of dye-sensitized solar cell by core–shell AuNRs@SiO2 in composite photoanode

Bai

Guo

et al. 2014

Journal of Power Sources

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Section: Resultsmentioning

confidence: 99%

Plasmonic enhancement of the performance of dye-sensitized solar cell by core–shell AuNRs@SiO2 in composite photoanode

Bai

Guo

et al. 2014

Journal of Power Sources

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“…This results in an increase of the local concentration of both the metal (Pt 4+ ) and hydroxyl (OH – ) ions attributing to the loss of hydronium ions to the vapor. Accordingly, basic conditions are established, which are required for the syntheses of a variety of nanoparticles. ,− Hydroxyl ions are believed to play a role as a reducing agent, for example, by discharging. ,, As soon as the first metal clusters take shape, an autocatalytic path could be established, where more metal ions are adsorbed and reduced on the surface of these metal clusters.…”

Section: Resultsmentioning

confidence: 99%

Platinum Nanostructure Tailoring for Fuel Cell Applications Using Levitated Water Droplets as Green Chemical Reactors

El‐Nagar

Delikaya

Lauermann

et al. 2019

ACS Appl. Mater. Interfaces

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Tailoring of nanostructured materials with well-controlled morphologies and their integration into valuable applications in a facile, cheap, and green way remain a key challenge. Herein, platinum nanoparticles as well as Pt–polymer nanocomposites with unique shapes, including flower-, needle-, porous-, and worm-like structures, were synthesized and simultaneously deposited on a three-dimensional carbon substrate and carbon nanofibers in one step using a levitated, overheated water drop as a green, rotating chemical reactor. Sprinkling of a metal aqueous solution on a hot surface results in its sudden evaporation and creates an overheated zone along with the water self-ionization (i.e., charge separation) at the hot interface. These generated Leidenfrost conditions are believed to induce a series of chemical reactions involving the used solvent and counterions, resulting in the nanoparticles formation. Besides, the in situ generated basic conditions in the vicinity of the liquid–vapor interface due to the loss of hydronium ions into the vapor layer could also play a role in the mechanism of the nanoparticles formation, e.g., by discharging. The as-prepared Pt nanostructures exhibited a superior catalytic activity and stability toward the desired direct formic acid oxidation (essential anodic reaction in fuel cells) into CO2 without generating CO poisoning intermediates compared to the state-of-the-art commercial PtC electrode. The addressed nanotailoring technique is believed to be a promising, inexpensive, and scalable way for the sustainable manufacture of well-designed nanomaterials for future applications.

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“…Accordingly, we postulate that the fast evaporation and charge separation at the hot interface would serve to concentrate the precursor salt and in the same vicinity create local basic pH conditions owing to the counter hydroxide ion left behind after the loss of the hydronium ion to the vapours. The hydroxide ion would not only lead to the basic conditions required for a wide variety of nanoparticle formation 26 27 28 but it could also play a role as a reducing agent, 29 30 for instance, by discharging. Thus, a favourable environment for a cost-effective, efficient and green nanochemical reactor is created, as depicted in Fig.…”

Section: Resultsmentioning

confidence: 99%

Green chemistry and nanofabrication in a levitated Leidenfrost drop

et al. 2013

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Green nanotechnology focuses on the development of new and sustainable methods of creating nanoparticles, their localized assembly and integration into useful systems and devices in a cost-effective, simple and eco-friendly manner. Here we present our experimental findings on the use of the Leidenfrost drop as an overheated and charged green chemical reactor. Employing a droplet of aqueous solution on hot substrates, this method is capable of fabricating nanoparticles, creating nanoscale coatings on complex objects and designing porous metal in suspension and foam form, all in a levitated Leidenfrost drop. As examples of the potential applications of the Leidenfrost drop, fabrication of nanoporous black gold as a plasmonic wideband superabsorber, and synthesis of superhydrophilic and thermal resistive metal–polymer hybrid foams are demonstrated. We believe that the presented nanofabrication method may be a promising strategy towards the sustainable production of functional nanomaterials.

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Synthesis and thermal stability of gold nanowires within monolithic mesoporous silica

Cited by 7 publications

References 33 publications

Plasmonic enhancement of the performance of dye-sensitized solar cell by core–shell AuNRs@SiO2 in composite photoanode

Plasmonic enhancement of the performance of dye-sensitized solar cell by core–shell AuNRs@SiO2 in composite photoanode

Platinum Nanostructure Tailoring for Fuel Cell Applications Using Levitated Water Droplets as Green Chemical Reactors

Green chemistry and nanofabrication in a levitated Leidenfrost drop

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