Characterization of acoustic Lamb wave propagation in polycrystalline diamond films by laser ultrasonics

Whitfield, Michael D.; Audic, Barbara; Flannery, C.M.; Kehoe, L.; Crean, G.M.; Jackman, Richard B.

doi:10.1063/1.1286010

Cited by 15 publications

(7 citation statements)

References 33 publications

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“…Detection can be done by optical interferometry [41,42], or, in a simpler way, by piezoelectric sensing: either a piezoelectric polymer foil pressed on the sample by a blade [43][44][45][46][47], or a piezoceramic stripe [48]. A ready-to-use commercial apparatus is also available.…”

Section: Laser Ultrasonicsmentioning

confidence: 99%

Ultrasonic and Spectroscopic Techniques for the Measurement of the Elastic Properties of Nanoscale Materials

Beghi¹

2021

Nanomechanics - Theory and Application

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Materials at the nanoscale often have properties which differ from those they have in the bulk form. These properties significantly depend on the production process, and their measurement is not trivial. The elastic properties characterize the ability of materials to deform in a reversible way; they are of interest by themselves, and as indicators of the type of nanostructure. As for larger scale samples, the measurement of the elastic properties is more straightforward, and generally more precise, when it is performed by a deformation process which involves exclusively reversible strains. Vibrational and ultrasonic processes fulfill this requirement. Several measurement techniques have been developed, based on these processes. Some of them are suitable for an extension towards nanometric scales. Until truly supramolecular scales are reached, the elastic continuum paradigm remains appropriate for the description and the analysis of ultrasonic regimes. Some techniques are based on the oscillations of purpose-built testing structures, mechanically actuated. Other techniques are based on optical excitation and/or detection of ultrasonic waves, and operate either in the time domain or in the frequency domain. A comparative overview is given of these various techniques.

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Section: Laser Ultrasonicsmentioning

confidence: 99%

Ultrasonic and Spectroscopic Techniques for the Measurement of the Elastic Properties of Nanoscale Materials

Beghi¹

2021

Nanomechanics - Theory and Application

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“…The nomenclature assumed for these ultra‐small granular structured films was ultra‐nanocrystalline diamond (UNCD) films. This subsequently oriented the focus of research towards UNCD films, not only for EFE applications , but also for applications as micro and/or nano electro mechanical systems (MEMS/NEMS) , biomaterials etc. Such reports led to the possibility of visioning low temperature synthesis of UNCD films (350 °C) with good EFE properties ( E 0 = 7 V/µm).…”

Section: Status Of Progress On the Processing Of Diamond Films For Thmentioning

confidence: 99%

On the role of graphite in ultrananocrystalline diamond films used for electron field emitter applications

Kurian

Sankaran

Lin

2014

Physica Status Solidi (a)

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This Feature Article gives an account of the different pieces of work conducted by various groups around the world aimed at constituting a single model explaining the enhancement of conductivity and electron field emission properties in diamond. The scope of the presence of graphite phase or the evolution of intermediate energy levels within the band gap or defects in the diamond phase being causes of such enhancement has been explored by various groups. Along with this we present the studies performed by our group, the enhancement of the field emission and conductivity employing different approaches like ion irradiation, ion implantation, ion doping in the plasma or formation of composite films. From our studies we reveal that such modifications of properties are related to microstructural alterations. The prominent change observed, and contributing to this enhancement, is the increase in the grain boundaries, with sp2 graphitic phases residing in them. The effect of n‐ or p‐type doing into diamond is ruled out. The betterment of the field emission and conductivity is attributed to the interconnected sp2 phases within the grain boundaries, which form itineraries for electrons to traverse through the material.

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“…2001;Flannery et al . 2003) or by a Michelsontype interferometer (Neubrand & Hess 1992;Whitfield et al . 2000); the propagation velocity, a function of the frequency, is derived by Fourier analysis of the measured displacement.…”

Section: (Iii) Measurement Of Surface Acoustic Wavesmentioning

confidence: 99%

“…(1997) measured diamond films of few micrometres thickness, deposited on silicon, detecting the Rayleigh wave and finding values of E very close to those of crystalline diamond. Whitfield et al . (2000) measured free-standing CVD films of different diamond quality, detecting the Lamb waves (the peculiar acoustic modes of a free-standing plate) and finding a strong influence of the film defects.…”

Section: (B) Diamondmentioning

confidence: 99%

Low–frequency Raman and Brillouin spectroscopy from graphite, diamond and diamond–like carbons, fullerenes and nanotubes

Beghi

Bottani

2004

Philosophical Transactions of the Royal Society of London. Seri

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Inelastic light scattering by acoustic phonons (Brillouin scattering) is a useful tool for probing material properties at the submicrometre scale. In media which are statistically homogeneous at this scale, it gives access to the acoustic properties and the elastic moduli. In nanostructures it probes the vibrational properties at the mesoscopic scale. Applications to carbonaceous materials are reviewed.

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Characterization of acoustic Lamb wave propagation in polycrystalline diamond films by laser ultrasonics

Abstract: Articles you may be interested inRayleigh surface acoustic wave modes of (100) ZnO films on (111) diamond Appl. Phys. Lett. 94, 032908 (2009); 10.1063/1.3074370Laser-based measurement of elastic and mechanical properties of layered polycrystalline silicon structures with projection masks

Cited by 15 publications

References 33 publications

Ultrasonic and Spectroscopic Techniques for the Measurement of the Elastic Properties of Nanoscale Materials

Ultrasonic and Spectroscopic Techniques for the Measurement of the Elastic Properties of Nanoscale Materials

On the role of graphite in ultrananocrystalline diamond films used for electron field emitter applications

Low–frequency Raman and Brillouin spectroscopy from graphite, diamond and diamond–like carbons, fullerenes and nanotubes

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