Interesting optical properties of films composed of very small grains formed from a high-rate nanoparticle beam

Urban, Frank K.; Hosseini-Tehrani, A.; Khabari, A.; Griffiths, P.; Fernandez, Gonzalo Vallejo

doi:10.1016/s0257-8972(99)00373-4

Cited by 7 publications

(5 citation statements)

References 12 publications

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“…Within the abrupt slope (500-700 nm), the refractive indices of samples A and B present decreases of about 0.8 and 0.6, respectively. The result is similar to the property of the Cu thin film reported by Urban et al 24 The variation range of the refraction indices for samples A and B are 1.37-0.49 and 1.20-0.23 in the wavelength range of 300-1000 nm. The refractive index n of sample B is much higher in the measured wavelength range, which results from the denser surface.…”

Section: Optical Propertiessupporting

confidence: 90%

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Characteristic of Nano-Cu Film Prepared by Energy Filtrating Magnetron Sputtering Technique and Its Optical Property

Wang

Yao

2015

Journal of Elec Materi

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At the optimized deposition parameters, Cu film was deposited by the direct current magnetron sputtering (DMS) technique and the energy filtrating magnetron sputtering (EFMS) technique. The nano-structure was charactered by x-ray diffraction. The surface morphology of the film was observed by atomic force microscopy. The optical properties of the film were measured by spectroscopic ellipsometry. The refractive index, extinction coefficient and the thickness of the film were obtained by the fitted spectroscopic ellipsometry data using the Drude-Lorentz oscillator optical model. Results suggested that a Cu film with different properties was fabricated by the EFMS technique. The film containing smaller particles is denser and the surface is smoother. The average transmission coefficient, the refractive index and the extinction coefficients are higher than those of the Cu film deposited by the DMS technique. The average transmission coefficient (400-800 nm) is more than three times higher. The refractive index and extinction coefficient (at 550 nm) are more than 36% and 14% higher, respectively.

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Section: Optical Propertiessupporting

confidence: 90%

“…There are evident troughs at about 570 nm. 24 Sample B has a higher extinction coefficient. The extinction coefficient k represents the absorption coefficient that is proportional to the absorption coefficient a.…”

Section: Optical Propertiesmentioning

confidence: 94%

Characteristic of Nano-Cu Film Prepared by Energy Filtrating Magnetron Sputtering Technique and Its Optical Property

Wang

Yao

2015

Journal of Elec Materi

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“…In this study a spectroscopic ellipsometer, combined with a gas handling system, was employed to monitor the changes of the nanoparticle films during exposure to chemical vapours. The ability to measure the ellipsometric properties of the film at multiple wavelengths and variable angles allows a more reliable determination of film properties [18,19].…”

Section: Introductionmentioning

confidence: 99%

Vapour sensing using surface functionalized gold nanoparticles

et al. 2002

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The electrical and optical response of thin films of surface functionalized nanoparticles upon exposure to various chemical vapours has been studied. It was found that the electrical response to chemical vapours adsorbed on the various nanoparticle films varied markedly and was determined by the surface functional groups. Ellipsometric studies revealed that the film thickness increased during exposure to the chemical vapours. These thickness changes of the films correlate with the changes in electrical conductivity. Two physical effects are believed to play a role in determining these conductivity changes. Under high partial pressure, the change in nanoparticle core-core separation is the main contribution to the change in conductivity and generally leads to a reduction in the conductivity. However, for relatively low partial pressures the adsorption of vapour molecules leads to permittivity changes that tend to increase the conductivity.

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“…Only then can the unique physical and chemical properties of such structures be studied, understood, and applied. 8,9 The general objectives of the work presented here are: ͑1͒ Among the most prominent of these areas is the use of nanoscale materials in magnetic data storage.…”

Section: Introductionmentioning

confidence: 99%

Nanoparticle beam formation and investigation of gold nanostructured films

Khabari

Urban

Griffiths

et al. 2003

Journal of Vacuum Science &Amp; Technology B: Microelectronics and Nanometer Structures Processing, Measurement, and Phenomena

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Articles you may be interested inRecording-media-related morphology and magnetic properties of crystalline CoPt3 and CoPt3-Au core-shell nanoparticles synthesized via reverse microemulsionThe object of the present work is the formation of a nearly collimated beam of gold nanoparticles with a high deposition rate and investigation of the resulting nanostructured gold film deposited onto ͑111͒ silicon substrates. The shape, size, and orientation of nanostructured gold crystals were analyzed by transmission electron microscopy and x-ray diffraction, and optical properties were investigated by ellipsometry. It was found that the optical properties of gold nanostructured films are completely different from the optical properties of conventionally deposited films reported in the literature. It was also found most crystals were grown on ͑111͒ plane with an indication of an expitaxial contact between the film and the substrate. The crystallite size was approximately 8 nm in diameter. High-resolution transmission electron microscopy also revealed that the gold nanophase crystals are cubo-octahedral with larger surface areas ͑octahedral part͒ at ͑111͒ orientation.

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Interesting optical properties of films composed of very small grains formed from a high-rate nanoparticle beam

Cited by 7 publications

References 12 publications

Characteristic of Nano-Cu Film Prepared by Energy Filtrating Magnetron Sputtering Technique and Its Optical Property

Characteristic of Nano-Cu Film Prepared by Energy Filtrating Magnetron Sputtering Technique and Its Optical Property

Vapour sensing using surface functionalized gold nanoparticles

Nanoparticle beam formation and investigation of gold nanostructured films

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