Simulation of the absorption spectra of nanometallic Al particles with core–shell structure: size-dependent interband transitions

Peng, Yajing; Wang, Yinghui; Yang, Yanqiang; Dlott, Dana D.

doi:10.1007/s11051-009-9785-9

Cited by 17 publications

(8 citation statements)

References 35 publications

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“…The heating rate of Al NPs with 808 nm laser is enhanced from the plasmonic coupling, which falls within the broad Al absorption spectrum. Absorption spectra consist of the combination of plasmon resonance and interband transitions [ 73 , 74 ]. The 808 nm near-IR laser overlaps with a portion of Al absorption spectra associated with the dielectric loss [ 72 ].…”

Section: Resultsmentioning

confidence: 99%

Surface Plasmon Enhanced Fluorescence Temperature Mapping of Aluminum Nanoparticle Heated by Laser

Zakiyyan

Darr

Chen

et al. 2021

Sensors

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Partially aggregated Rhodamine 6G (R6G) dye is used as a lights-on temperature sensor to analyze the spatiotemporal heating of aluminum nanoparticles (Al NPs) embedded within a tetrafluoroethylene, hexafluoropropylene, and vinylidene fluoride (THV) fluoropolymer matrix. The embedded Al NPs were photothermally heated using an IR laser, and the fluorescent intensity of the embedded dye was monitored in real time using an optical microscope. A plasmonic grating substrate enhanced the florescence intensity of the dye while increasing the optical resolution and heating rate of Al NPs. The fluorescence intensity was converted to temperature maps via controlled calibration. The experimental temperature profiles were used to determine the Al NP heat generation rate. Partially aggregated R6G dyes, combined with the optical benefits of a plasmonic grating, offered robust temperature sensing with sub-micron spatial resolution and temperature resolution on the order of 0.2 °C.

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Section: Resultsmentioning

confidence: 99%

Surface Plasmon Enhanced Fluorescence Temperature Mapping of Aluminum Nanoparticle Heated by Laser

Zakiyyan

Darr

Chen

et al. 2021

Sensors

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“…The interband transition extension of Drude theory was developed to describe the interband electronic transitions observed in nanoparticles (that arise from confinement effects) and the large differences in local fields in and around the nanoparticle. 71 By fitting the optical properties of Al nanoparticles of various sizes to the interband model, coefficients that reproduce the frequency response of the permittivity are obtained. 71 Here, coefficients previously calculated in the literature 71 for 111.4 nm diameter nanoparticles are used, since the average diameter of the present Al nanoparticles is about 100 nm.…”

Section: Resultsmentioning

confidence: 99%

“…By fitting the optical properties of Al nanoparticles of various sizes to the interband model, coefficients that reproduce the frequency response of the permittivity are obtained . Here, coefficients previously calculated in the literature for 111.4 nm diameter nanoparticles are used, since the average diameter of the present Al nanoparticles is about 100 nm. From the real and imaginary parts of the permittivity calculated using eqs and , the normalized tan δ can be calculated as ε″/ε′ (Figures and ), where the calculated tan δ values have been normalized to the highest calculated value for comparison among suggested structures. , By comparing peak positions in the plot for the normalized loss tangent as a function of the logarithmic frequency, the nature of the relaxation process and the relaxation frequency can be determined .…”

Section: Resultsmentioning

confidence: 99%

Sustainable High Capacitance at High Frequencies: Metallic Aluminum–Polypropylene Nanocomposites

Fredin

Lanagan

et al. 2012

ACS Nano

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The high-frequency dielectric response of 0-3 polypropylene nanocomposites prepared with the activated metallocene polymerization catalyst [rac-ethylenebisindenyl]zirconium dichlororide absorbed on the native Al(2)O(3) surfaces of metallic aluminum nanoparticles is characterized. The nanocomposites produced are randomly dispersed in the polyolefin matrix with no visible defects that might degrade film dielectric properties. Electrical measurements show that as the volume fraction of Al nanoparticles is increased, the effective permittivity of the nanocomposites increases, with ε(r) values reaching ~10 at relatively low frequency (1 MHz). Because of the high permittivity and conductivity contrast between the metal nanoparticles and the polypropylene matrix, Maxwell-Wagner-Sillars theory can be applied to model the loss at high frequencies and provide insight into how the nanocomposite high frequency response scales with Al volume fraction. At higher Al nanoparticle volume fractions, mixing theories predict greater densities of nanoparticle aggregates, consistent with the experimentally observed shift of the dielectric relaxation to lower frequencies. Although these nanocomposites undergo the predicted initial dielectric relaxation with increasing frequency, the metallic nanoparticle complex permittivity imbues the higher Al volume fraction materials with relatively high, sustainable permittivities, 6, at frequencies as high as 7 GHz.

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“…26 Since the hydrolysis of AlLi IMC can yield an alkaline aqueous solution of Al 3+ and Li + with a pH of 12.3, stirring such the solution in the ambient atmosphere causes sufficient CO 3 2À ions to be present in the solution to form Li-Al-CO 3 LDH. Al particles 27,28 and Al film 29 have an Al-Al 2 O 3 core-shell structure due to the facile formation of an Al 2 O 3 layer in air. [27][28][29] Al 2 O 3 is extensively adopted as a catalyst 30,31 or catalyst support 32,33 owing to its distinct chemical properties.…”

Section: Resultsmentioning

confidence: 99%

“…Al particles 27,28 and Al film 29 have an Al-Al 2 O 3 core-shell structure due to the facile formation of an Al 2 O 3 layer in air. [27][28][29] Al 2 O 3 is extensively adopted as a catalyst 30,31 or catalyst support 32,33 owing to its distinct chemical properties. Chemical catalysis benefits especially from nanoparticles, due to the extremely large surface to volume ratio.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Li–Al-carbonate layered double hydroxide in a metal salt-free system

2010

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Simulation of the absorption spectra of nanometallic Al particles with core–shell structure: size-dependent interband transitions

Cited by 17 publications

References 35 publications

Surface Plasmon Enhanced Fluorescence Temperature Mapping of Aluminum Nanoparticle Heated by Laser

Surface Plasmon Enhanced Fluorescence Temperature Mapping of Aluminum Nanoparticle Heated by Laser

Sustainable High Capacitance at High Frequencies: Metallic Aluminum–Polypropylene Nanocomposites

Synthesis of Li–Al-carbonate layered double hydroxide in a metal salt-free system

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