Thermal transport properties of gold-covered thin-film silicon dioxide

Burzo, Mihai; Komarov, Pavel L.; Raad, Peter E.

doi:10.1109/tcapt.2003.811467

Cited by 61 publications

(30 citation statements)

References 28 publications

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“…The actual thermal conductivities obtained for SiO 2 samples are compliant with those obtained by other researchers (Fig. 9) [55][56][57][58][59][60]. The results obtained in this work and accessible in literature can be described by the BTE model of the effective thermal conductivity.…”

Section: Resultssupporting

confidence: 89%

Quantitative Thermal Microscopy Measurement with Thermal Probe Driven by dc+ac Current

et al. 2016

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Quantitative thermal measurements with spatial resolution allowing the examination of objects of submicron dimensions are still a challenging task. The quantity of methods providing spatial resolution better than 100 nm is very limited. One of them is scanning thermal microscopy (SThM). This method is a variant of atomic force microscopy which uses a probe equipped with a temperature sensor near the apex. Depending on the sensor current, either the temperature or the thermal conductivity distribution at the sample surface can be measured. However, like all microscopy methods, the SThM gives only qualitative information. Quantitative measuring methods using SThM equipment are still under development. In this paper, a method based on simultaneous registration of the static and the dynamic electrical resistances of the probe driven by the sum of dc and ac currents, and examples of its applications are described. Special attention is paid to the investigation of thin films deposited on thick substrates. The influence of substrate thermal properties on the measured signal and its dependence on thin film thermal conductivity and film thick-This article is part of the selected papers presented at the 18th International Conference on Photoacoustic and Photothermal Phenomena.

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Section: Resultssupporting

confidence: 89%

Quantitative Thermal Microscopy Measurement with Thermal Probe Driven by dc+ac Current

et al. 2016

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“…Some reports place the conductance relatively low for solid-solid interfaces, with the Au-dielectric conductance at 40 MW m −2 K −1 independent of the dielectric,49 and Au-glass conductance at 100 MW m −2 K −1 for glass with a silica content of 53%,50 and 60 MW m −2 K −1 for gold on thermally grown thin silica films 51. However, the structure of the silica and details of the interface play an important role51 and interfacial heat conductance in excess of 220 MW m −2 K −1 have been measured for more grainy gold films52, which is in better agreement with what our results suggest. In contrast, the silica to water interface has a very high thermal conductance in excess of 1000 MW m −2 K −1 as determined by molecular dynamics 53–54.…”

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confidence: 99%

Silica-Coated Gold Nanorods as Photoacoustic Signal Nanoamplifiers

et al. 2011

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Photoacoustic signal generation by metal nanoparticles relies on the efficient conversion of light to heat, its transfer to the environment and the production of pressure transients. In this study we demonstrate that a dielectric shell has a strong influence on the amplitude of the generated photoacoustic signal, and that silica coated gold nanorods of the same optical density are capable of producing about 3-fold higher photoacoustic signals than nanorods without silica coating. Spectrophotometry measurements and finite difference time domain (FDTD) analysis of gold nanorods before and after silica coating showed only an insignificant change of the extinction and absorption cross-sections, hence indicating that the enhancement is not attributable to changes in absorption cross-section resulting from the silica coating. Several factors including the silica thickness, the gold/silica interface, and the surrounding solvent were varied to investigate their effect on the photoacoustic signal produced from silica-coated gold nanorods. The results suggest that the enhancement is caused by the reduction of the gold interfacial thermal resistance with the solvent due to the silica coating. The strong contrast enhancement in photoacoustic imaging, demonstrated using phantoms with silica-coated nanorods, shows that these hybrid particles acting as "photoacoustic nano-amplifiers" are high efficiency contrast agents for photoacoustic imaging or photoacoustic image-guided therapy. KeywordsPhotoacoustic imaging; silica coated-gold nanorods; photoacoustic nano-amplifiers; medical and biological imaging; contrast agents Photoacoustic imaging is a non-ionizing and noninvasive imaging modality that combines the advantages of both optical and acoustic imaging. [1][2][3][4] In photoacoustic imaging, the intensity modulated electromagnetic radiation, e.g. a beam of pulsed laser light, is directed at the imaging target. The light is absorbed and converted to an outgoing thermoacoustic wave that can be detected by an ultrasound transducer and used to reconstruct images.5 -8 Since light is only used for heating and not for imaging, and acoustic waves are less scattered in optically turbid materials such as tissue, photoacoustic imaging can reach far deeper into turbid materials than purely optical imaging techniques.8 -9 The contrast in photoacoustic * To whom correspondence should be addressed. Telephone: (512) 471-1733. Fax: (512) imaging depends on the optical-to-acoustic conversion (optoacoustic) efficiency, i.e., how many incident photons can be absorbed and converted to heat, and how fast the generated heat can diffuse out from the target during thermoelastic expansion and wave generation. When a uniformly absorbing target is irradiated by pulsed light, the amplitude of the generated photoacoustic signal is proportional to the optical absorption and the thermalacoustic properties of the absorbing medium. In contrast, in a heterogeneous medium such as a weakly absorbing solvent containing plasmonic nanoparticles, the amp...

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“…reported the thermoelectric characterization of the compound

α

‐As 2 Te 3 between 5 K and 523 K . It was shown that

α

‐As 2 Te 3 has ∼1 W m −1 K −1 thermal conductivity around room temperature which is lower than SiO 2 thin layer ,. Very recently, the PECVD synthesis and optical characterization of As−Te chalcogenide films were successfully done by Mochalov et al .…”

Section: Introductionmentioning

confidence: 99%

Monolayer AsTe₂: Stable Robust Metal in 2D, 1D and 0D

2018

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The structural, phononic, and electronic properties of the monolayer structures of AsTe are characterized by performing density functional theory (DFT) calculations. Total energy optimization and phonon calculations reveal that single layers of the 2H-AsTe and 1T-AsTe phases form dynamically stable crystal structures. Electronic structure analysis also shows that both 2H and 1T phases have nonmagnetic metallic character. It is also predicted that the metallic nature of the ultra-thin both 2H-AsTe and 1T-AsTe structures remain unchanged even under high biaxial strain values. For further examination of the dimensionality effect in the robust metallicity in 2D AsTe phases, electronic characteristics of 1D nanoribbons and 0D quantum dots are also investigated. It is found that independent from the dimension and crystallographic orientations 0D and 1D structures of 2H- and 1T-AsTe structures have metallic behavior. It is found that single layers of AsTe are quite promising materials for nanodevice applications owing to the robust metallic character.

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Thermal transport properties of gold-covered thin-film silicon dioxide

Cited by 61 publications

References 28 publications

Quantitative Thermal Microscopy Measurement with Thermal Probe Driven by dc+ac Current

Quantitative Thermal Microscopy Measurement with Thermal Probe Driven by dc+ac Current

Silica-Coated Gold Nanorods as Photoacoustic Signal Nanoamplifiers

Monolayer AsTe₂: Stable Robust Metal in 2D, 1D and 0D

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Thermal transport properties of gold-covered thin-film silicon dioxide

Cited by 61 publications

References 28 publications

Quantitative Thermal Microscopy Measurement with Thermal Probe Driven by dc+ac Current

Quantitative Thermal Microscopy Measurement with Thermal Probe Driven by dc+ac Current

Silica-Coated Gold Nanorods as Photoacoustic Signal Nanoamplifiers

Monolayer AsTe2: Stable Robust Metal in 2D, 1D and 0D

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Monolayer AsTe₂: Stable Robust Metal in 2D, 1D and 0D