Study of copper nanoparticles formation on supports of different nature by UV–Vis diffuse reflectance spectroscopy

Pestryakov, Alexey; Petranovskii, Vitalii; Kryazhov, Andrey; Ozhereliev, Oleg; Pfänder, Norbert; Knop‐Gericke, Axel

doi:10.1016/j.cplett.2003.12.077

Cited by 156 publications

(77 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Cu2O-TiO2-P25 resulting from a photoreforming run carried out by adding Cu2O to a TiO2- Moreover, from a careful investigation of the DRUV spectra in the wavelength range of 520-580 nm, where signals belonging to plasmon resonance of copper nanoparticles fall [27,28], a large absorption band may be observed for both the copper-based-titanium dioxide catalysts.…”

Section: Discussionmentioning

confidence: 98%

In situ photodeposited nanoCu on TiO2 as a catalyst for hydrogen production under UV/visible radiation

Clarizia

Vitiello

Luciani

et al. 2016

Applied Catalysis A: General

View full text Add to dashboard Cite

Section: Discussionmentioning

confidence: 98%

In situ photodeposited nanoCu on TiO2 as a catalyst for hydrogen production under UV/visible radiation

Clarizia

Vitiello

Luciani

et al. 2016

Applied Catalysis A: General

View full text Add to dashboard Cite

“…Evolution of UV-vis spectra of ligand-exchanged copper nanoparticles after air exposure. Oleic acid-capped copper nanoparticles show a wide peak at ∼350 nm, which has been connected to Cu-O-Cu structures [43]. The intensity of this peak decreases over time and a wide absorbance band emerges at 650-700 nm after some 20 min in air.…”

Section: Oxidation Of Ligand-exchanged Nanoparticlesmentioning

confidence: 95%

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

Kanninen¹,

Johans²,

Merta

et al. 2008

Journal of Colloid and Interface Science

240

173

View full text Add to dashboard Cite

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).

show abstract

“…Table 2 shows that in the case of metal-mordenite unit cell volume decrease with incorporated metal to zeolite. The decrease in lattice parameters is attributed to the weak effective charge of metal ion than that of Na ion [26].Also, the cation size of Ni (0.55Å ), Co(0.65 Å ), and Cu (0.57 Å )are lower than related to Na (1.02 Å ) that can be decrease lattice parameters. Hence, the refined coordinates and bond distances reported in Table 3 and 4.The results of Rietveld refinements indicate that in the all three cases (Ni, Co, and Cu) the distribution and coordination of transition metal ions are very similar: three new sites have been found, although with slightly different position and population.…”

Section: X-ray Powder Diffraction and Rietveld Refinementsmentioning

confidence: 90%

“…2 Eg spin-allowed d-d transition band at 12,800 cm -1 which can be related to octahedral coordination on Cu 2? [25][26][27]. Table 1 shows the surface area (BET) measurement results of as synthesized mordenite and its Co-, Ni-, and Cuincorporated forms.…”

Section: Diffuse Reflectance Uv-vis Spectramentioning

confidence: 99%

Appraisal of microwave-assisted ion-exchange in mordenite by crystal structure analysis

2011

View full text Add to dashboard Cite

Transition metal-containing mordenite have been prepared by solid state ion exchange with microwave irradiation of mechanical mixtures of CoCl2·6H2O, NiCl2·6H2O and CuCl2·2H2O with mordenite at 750 W microwave power and for 10-20 min treatment time. The prepared transition metal-mordenite were characterized by X-ray diffraction (XRD), Fourier Transform infrared spectroscopy (FT-IR), simultaneous TG and DTA thermal analyses (TG/DTA), surface area measurement (BET), and diffuse reflectance spectroscopy (DRS). The results show that Co2+, Ni2+, and Cu2+ metal ions are actually incorporated into mordenite pores. The extra-framework locations of metal cations were determined Rietveld refinement of XRD data, performed in the Cmcm space group for all three samples. Three metal sites were located: the first site is in an almost perfect boat-shaped coordination with framework oxygen's, the second site is poorly coordinated while the third metal cation site was found at the center of mordenite cage in six-fold coordination to water molecules

show abstract

Study of copper nanoparticles formation on supports of different nature by UV–Vis diffuse reflectance spectroscopy

Cited by 156 publications

References 25 publications

In situ photodeposited nanoCu on TiO2 as a catalyst for hydrogen production under UV/visible radiation

In situ photodeposited nanoCu on TiO2 as a catalyst for hydrogen production under UV/visible radiation

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

Appraisal of microwave-assisted ion-exchange in mordenite by crystal structure analysis

Contact Info

Product

Resources

About