Optical Absorption of Copper Nanoparticles Dispersed within Pores of Monolithic Mesoporous Silica

Liu, Xiong; Cai, Weiping; Bi, Huijuan

doi:10.1557/jmr.2002.0166

Cited by 25 publications

(6 citation statements)

References 23 publications

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“…No visible precipitation occurred during 2 days. The effect of oxygen on the plasmon absorbance of copper nanoparticles has been observed before both in simulations [34] and experiments [26] and [35] and can be explained by oxidation layers formed on the particle.…”

Section: Brust-schiffrin Synthesis and Oxidation Of Lauric Acid-protementioning

confidence: 59%

Influence of ligand structure on the stability and oxidation of copper nanoparticles

Kanninen¹,

Johans²,

Merta

et al. 2008

Journal of Colloid and Interface Science

247

173

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The stability and oxidation of copper nanoparticles stabilized with various ligands have been studied. Lauric acid-capped copper nanoparticles were prepared by a modified Brust-Schiffrin method. Then, ligand exchange with an excess of different capping agents was performed.Oxidation and stability were studied by UV-vis, XRD, and TEM. Alkanethiols and oleic acid were found to improve air stability. The oxidation resistance of thiol-capped copper nanoparticles was found to increase with the chain length of the thiol. However, excess thiol caused etching of the particles under nitrogen. With oleic acid no etching was observed under nitrogen. After oxidation, no traces of the ligand-exchanged particles were found, suggesting their dissolution due to excess ligand. Oleic acid protected the particles against oxidation better than the tested thiols at large excess (ligand-copper ratio 20:1).

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Section: Brust-schiffrin Synthesis and Oxidation Of Lauric Acid-protementioning

confidence: 59%

Influence of ligand structure on the stability and oxidation of copper nanoparticles

Kanninen¹,

Johans²,

Merta

et al. 2008

Journal of Colloid and Interface Science

247

173

View full text Add to dashboard Cite

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“…This behavior can be explained by the increase in the NP size [17,18] caused by an enhanced mobility of the reduced atom inside the silica glass at higher annealing temperature.…”

Section: Resultsmentioning

confidence: 99%

H2-induced copper and silver nanoparticle precipitation inside sol-gel silica optical fiber preforms

et al. 2012

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Ionic copper- or silver-doped dense silica rods have been prepared by sintering sol-gel porous silica xerogels doped with ionic precursors. The precipitation of Cu or Ag nanoparticles was achieved by heat treatment under hydrogen followed by annealing under air atmosphere. The surface plasmon resonance bands of copper and silver nanoparticles have been clearly observed in the absorption spectra. The spectral positions of these bands were found to depend slightly on the particle size, which could be tuned by varying the annealing conditions. Hence, transmission electron microscopy showed the formation of spherical copper nanoparticles with diameters in the range of 3.3 to 5.6 nm. On the other hand, in the case of silver, both spherical nanoparticles with diameters in the range of 3 to 6 nm and nano-rods were obtained.

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“…This phenomena can be due to the formation of a thicker Cu 2 O layer (Ramyadevi et al 2012;Khanna et al 2008) and/ or wide distribution of particle sizes, intensive agglomeration and overlapping nanoparticles (Liu et al 2002;Khanna et al 2007).…”

Section: Effect Of Concentration Of Precursormentioning

confidence: 99%

Preparation of ultrafine grained copper nanoparticles via immersion deposit method

2018

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Today, the exploration about synthesis of nanoparticles is much of interest to materials scientists. In this work, copper nanoparticles have been successfully synthesized by immersion deposit method in the absence of any stabilizing and reducing agents. Copper (II) sulfate pentahydrate as precursor salt and distilled water and Ethylene glycol as solvents were used. The copper nanoparticles were deposited on plates of low carbon steel. The effects of copper sulfate concentrations and solvent type were investigated. X-ray diffraction, scanning electron microscopy and UV-Visible spectroscopy were taken to investigate the crystallite size, crystal structure, and morphology and size distribution and the growth process of the nanoparticles of obtained Cu particles. The results indicated that the immersion deposit method is a particularly suitable method for synthesis of semispherical copper nanoparticles with the crystallites size in the range of ~22 to 37 nm. By increasing the molar concentration of copper sulfate in distilled water solvent from 0.04 to 0.2 M, the average particles size is increased from 57 to 81 nm. The better size distribution of Cu nanoparticles was achieved using a lower concentration of copper sulfate. By increasing the molar concentration of copper sulfate in water solvent from 0.04 to 0.2, the location of the SPR peak has shifted from 600 to 630 nm. The finer Cu nanoparticles were formed using ethylene glycol instead water as a solvent. Also, the agglomeration and overlapping of nanoparticles in ethylene glycol were less than that of water solvent.

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Optical Absorption of Copper Nanoparticles Dispersed within Pores of Monolithic Mesoporous Silica

Cited by 25 publications

References 23 publications

Influence of ligand structure on the stability and oxidation of copper nanoparticles

Influence of ligand structure on the stability and oxidation of copper nanoparticles

H2-induced copper and silver nanoparticle precipitation inside sol-gel silica optical fiber preforms

Preparation of ultrafine grained copper nanoparticles via immersion deposit method

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