Template-assisted fabrication of nanowires

2010

Nanoscale Res Lett

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Thermally evaporated 50-nm nickel thin films coated on borosilicate glass substrates were nanostructured by excimer laser (0.5 J/cm2, single shot), DC electric field (up to 2 kV/cm) and trench-template assisted technique. Nanoparticle arrays (anisotropic growth features) have been observed to form in the direction of electric field for DC electric field treatment case and ruptured thin film (isotropic growth features) growth for excimer laser treatment case. For trench-template assisted technique; nanowires (70–150 nm diameters) have grown along the length of trench template. Coercive field and saturation magnetization are observed to be strongly dependent on nanostructuring techniques.

Section: Introductionmentioning

confidence: 99%

Magnetic Behavior of Surface Nanostructured 50-nm Nickel Thin Films

2010

Nanoscale Res Lett

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“… a SEM image for nickel nanowire growth for 50 nm thin film coating, b AFM image for the Ni nanowire growth, c AFM image of Ni nanowire grown in PLD, d SEM image of gold nanowire, e AFM image of Si nanowire, f AFM image of In nanowire [62,63]…”

Section: Guided Self-assemblymentioning

confidence: 99%

Directed Self-Assembly: Expectations and Achievements

2010

Nanoscale Res Lett

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Nanotechnology has been a revolutionary thrust in recent years of development of science and technology for its broad appeal for employing a novel idea for relevant technological applications in particular and for mass-scale production and marketing as common man commodity in general. An interesting aspect of this emergent technology is that it involves scientific research community and relevant industries alike. Top–down and bottom–up approaches are two broad division of production of nanoscale materials in general. However, both the approaches have their own limits as far as large-scale production and cost involved are concerned. Therefore, novel new techniques are desired to be developed to optimize production and cost. Directed self-assembly seems to be a promising technique in this regard; which can work as a bridge between the top–down and bottom–up approaches. This article reviews how directed self-assembly as a technique has grown up and outlines its future prospects.

“…The present authors have reported on the use of a few nonlithographic techniques to realize nanostructured thin films and bulk surfaces. These are template‐assisted growth of nanowires 5, electric‐field‐induced and laser‐induced nanostructuring of thin films and bulk surfaces 6, 7. The above‐mentioned approaches exploit the thermodynamics of the interaction between condensing vapor and substrate, and the post‐growth thermodynamics of the interaction of energetic (electric or laser) fields with a thin film or bulk surface.…”

Section: Introductionmentioning

confidence: 99%

A comparative study of laser‐ and electric‐field‐induced effects on the crystallinity, surface morphology and plasmon resonance of indium and gold thin films

Physica Status Solidi (a)

Krishna

2010

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The effects of post-deposition treatment of In and Au thin films by excimer laser and electric field are reported. The films were subjected to an electric field in the range of 0.1-3.3 kV/cm and laser irradiation in the range from 0.01 to 0.1 J/cm 2 . The effect of this treatment on the morphology and crystallinity of indium and gold thin films (10-100 nm thickness) is investigated. Indium films exhibited a three-fold grain growth at an electric field of 3.3 kV/cm. Gold thin film, on the other hand, showed significant grain growth at a much lower field of 0.6 kV/cm. The as-deposited thin films of indium and gold were amorphous but turned nanocrystalline with average crystallite sizes of 57 nm at 3.33 kV/cm and 35 nm at 0.66 kV/cm, respectively. When indium thin films were laser irradiated, flat disc-shaped grains for as-deposited thin films were transformed to spherical grains at a laser fluence of 0.02 J/cm 2 and cubical grains at 0.05 J/cm 2 . At 0.05 J/cm 2 , as-deposited amorphous indium and gold thin films turned nanocrystalline with crystallite sizes of 50 nm and 10 nm, respectively. Significantly, laser treatment causes the grain-size distribution to become narrower with a shift in mean size to larger values. Electric-field treatment on the other hand leads to a shifting of the mean grain size to larger values without affecting the distribution.