Annealing Process of Anisotropic Copper Nanocrystals. 1. Cylinders

Lisiecki, Isabelle; Sack-Kongehl, Hilde; Weiß, K.; Urban, Joachim; Pileni, Marie‐Paule

doi:10.1021/la0003443

Cited by 34 publications

(38 citation statements)

References 32 publications

(64 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Such features cannot be attributed to stacking faults. They were similarly observed with the quoted copper needles formed from colloidal solution [5,6] and are identified with the formation of a truncated decahedron as depicted in Figure 5. Here, the fivefold cylinder axis runs along the (110) orientation, which is parallel to the substrate, and the truncation is formed by the (100) planes of the five deformed tetrahedral subunits.…”

supporting

confidence: 66%

See 1 more Smart Citation

Growth of Rodlike Silver Nanoparticles by Vapor Deposition of Small Clusters

et al. 2000

View full text Add to dashboard Cite

supporting

confidence: 66%

“…Similar observations were, to our knowledge, only made before with metal particles formed from solution. [5,6] For that case, Cu needles resulted from the reduction of copper(II ) bis(2-ethylhexyl)sulfosuccinate, [Cu(AOT) 2 ], in isooctane/NaCl/water colloidal self-assemblies, where the ligands stabilised large truncated decahedra.…”

mentioning

confidence: 99%

Growth of Rodlike Silver Nanoparticles by Vapor Deposition of Small Clusters

et al. 2000

View full text Add to dashboard Cite

“…Ni grid coated with α-C film is often used for in-situ heating experiments [9]. One Ni grid coated with α-C film (relative thickness is about 0.13, EDXS spectrum shows that α-C film is homogeneous in composition) was heated up to 600°C for 1.3 hour, 700°C for 0.5 hour, then 750°C for 1.0 hour and finally to 800°C for 0.3 hour.…”

Section: Ni Grid Coated With α-C Filmmentioning

confidence: 99%

“…So far, in most in-situ heating experiments the nanoparticles are dispersed on the ultra-thin amorphous carbon (α-C) or silicon monoxide films, which is mounted on a Cu grid [4,8] or Ni [9], Mo [10] grid. However, there is no systematic investigation of the stability of such metal grids at high temperatures in high vacuum.…”

Section: Introductionmentioning

confidence: 99%

Behaviour of TEM metal grids during in-situ heating experiments

Zhang

2009

Ultramicroscopy

View full text Add to dashboard Cite

The stability of Ni, Cu, Mo and Au TEM grids coated with ultra-thin amorphous carbon or silicon monoxide film is examined by in-situ heating up to a temperature in the range 500~850°C in a transmission electron microscope. It is demonstrated that some grids can generate nano-particles either due to the surface diffusion of metal atoms on amorphous film or due to metal evaporation/redeposition. The emergence of nano-particles can complicate experimental observations, particularly in in-situ heating studies of dynamic behaviours of nanomaterials in TEM. The most widely used Cu grid covered with amorphous carbon is unstable, and numerous Cu nano-particles start to form once heating temperature reaches 600°C. In the case of Ni grid covered with α-C film, a large number of Ni nano-crystals occur immediately when the temperature approaches to 600 °C, accompanied by the graphitization of amorphous carbon. In contrast, both Mo and Au grids covered with α-C film exhibit good stability at elevated temperature, for instance, up to 680°C and 850°C for Mo and Au, respectively, and no any metal nano-particles are detected. Cu grid covered Si monoxide thin film is stable up to 550 °C, but Si nano-crystals appear under intensive electron beam. The generated nano-particles are well characterized by spectroscopic techniques (EDXS/EELS) and high-resolution TEM. The mechanism of nano-particle formation is addressed based on the interactions between the metal grid and the amorphous carbon film and on the sublimation of metal.

show abstract

“…10͒. At these temperatures, the coating agent burns, leaving a graphite shell surrounding the nanocrystals, 51 which probably favors the nanocrystals' diffusion on the HOPG substrate, but still protects them from coalescence. Due to this increased surface mobility, the nanocrystals move to decorate lines forming along the atomic steps of the substrate.…”

Section: Annealing Of Copt Nanocrystalsmentioning

confidence: 99%

Magnetic properties of cobalt and cobalt–platinum nanocrystals investigated by magneto-optical Kerr effect

Petit

Rusponi

Brune

2004

Journal of Applied Physics

View full text Add to dashboard Cite

Magneto-optical Kerr effect, is used to investigate the magnetization of film made of uncoalesced cobalt and cobalt-platinum nanocrystals. For the pure cobalt nanocrystals, different film morphologies are obtained through application of magnetic field during deposition. These morphologies have quite different magnetic properties, which is rationalized by considering dipolar interactions and the associated demagnetizing factor. We show that fast annealing can be used to trigger changes in the particles' crystalline structure while largely avoiding their coalescence. With increasing the annealing temperature, 2.7 nm CoPt nanocrystals show a transition from the magnetically soft face-centered-cubic phase to the hard face-centered-tetragonal L1 0 phase. In particular fast annealing to 950 K is shown to produce largely uncoalesced nanocrystals ferromagnetic at room temperature. With 7 nm cobalt nanocrystals, fast annealing at 500 K equally results in ferromagnetism at room temperature without inducing coalescence between the nanocrystals in the film.

show abstract

Annealing Process of Anisotropic Copper Nanocrystals. 1. Cylinders

Cited by 34 publications

References 32 publications

Growth of Rodlike Silver Nanoparticles by Vapor Deposition of Small Clusters

Growth of Rodlike Silver Nanoparticles by Vapor Deposition of Small Clusters

Behaviour of TEM metal grids during in-situ heating experiments

Magnetic properties of cobalt and cobalt–platinum nanocrystals investigated by magneto-optical Kerr effect

Contact Info

Product

Resources

About