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Angle dependent light scattering by gold nanospheres
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Fasta tillståndets fysik.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Fasta tillståndets fysik.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kemi - Ångström, Fysikalisk kemi.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Fasta tillståndets fysik.ORCID-id: 0000-0002-8279-5163
2015 (Engelska)Ingår i: INERA Conference: Book of Abstracts, 2015, s. 71-, artikel-id 012018Konferensbidrag, Poster (med eller utan abstract) (Refereegranskat)
Abstract [en]

Gold nanocrystals exhibit unique optical properties in enhanced light absorption and scattering owing to their extremely large scattering/absorption cross. sections and large electric field enhancements generated by localized surface plasmon resonance. In this work, the optical properties of gold nanospheres with diameters of 60 nm and 200 nm with remarkable uniformity in size were studied both numerically and experimentally. The total transmittance and reflectance as well as the angle. resolved light scattering intensities of the gold nanospheres were measured. The absorption and scattering coefficients were obtained by fitting the experimental data to the two. flux theory and were in qualitative agreement with single. scattering calculations using the Mie theory.

Ort, förlag, år, upplaga, sidor
2015. s. 71-, artikel-id 012018
Serie
Journal of Physics Conference Series, ISSN 1742-6588 ; 682
Nationell ämneskategori
Den kondenserade materiens fysik Teknik och teknologier
Identifikatorer
URN: urn:nbn:se:uu:diva-266863DOI: 10.1088/1742-6596/682/1/012018ISI: 000372173400018OAI: oai:DiVA.org:uu-266863DiVA, id: diva2:868983
Konferens
Light in Nanoscience and Nanotechnology, LNN 2015, October 20-22, 2015, Hissar, Bulgaria
Tillgänglig från: 2015-11-12 Skapad: 2015-11-12 Senast uppdaterad: 2019-01-21Bibliografiskt granskad
Ingår i avhandling
1. Angle dependent light scattering of functional nanoparticle composites
Öppna denna publikation i ny flik eller fönster >>Angle dependent light scattering of functional nanoparticle composites
2019 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Varies functional nanoparticles play crucial roles in energy- and optical- related applications. The incorporation of functional nanoparticles into non-absorbing polymers to form optical absorption and scattering thin films have attracted considerable interest due to a successful selection of particles and matrices, synergistic effects of separation and fixation of particles, and controllable layer thicknesses and structures. To investigate the optical parameters, especially absorption and scattering coefficients of the nanocomposites, it is critical to evaluate and optimize those particle based functional layers.

In this thesis, we mainly focus on developing approaches for the inversion of scattering and absorption coefficients from optically measured transmittance and reflectance spectra. A two-flux radiative transfer model is robust for this purpose, but its limitation lies in failing to converge the transmittance and reflectance spectra to experimental data owing to the approximation of the completely diffuse scattering patterns. We carried out thorough characterization of angle- and wavelength-resolved light scattering on those nanocomposites with metallic Au, ferromagnetic Fe3O4 and photocatalytic TiO2 nanoparticles. We further developed an empirical scattering phase function, which can fully represent the scattering distributions for aggregated particles in the multiple scattering regime, as well as the single scattering in the Rayleigh, Mie and geometric optical scattering regimes. The incorporation of angle-resolved data into the two-flux theory to derive scattering and absorption coefficients have been validated using the functional nanoparticle composites. Several approximations are also proposed to obtain the scattering and absorption coefficients when angle resolved measurements were not available.

The optical performance was investigated on the nanocomposites mentioned above with varied sizes, shapes and concentrations using a spectrophotometer, an in-plane scatterometer and an out-of-plane goniometer. Single particle dark-field scattering spectra were also obtained for Au, Fe3O4, and TiO2 particles in the forward and backward directions.

Ort, förlag, år, upplaga, sidor
Uppsala: Acta Universitatis Upsaliensis, 2019. s. 89
Serie
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1767
Nyckelord
light scattering, nano particle, absorption, radiative transfer
Nationell ämneskategori
Nanoteknik
Forskningsämne
Fasta tillståndets fysik
Identifikatorer
urn:nbn:se:uu:diva-374319 (URN)978-91-513-0559-2 (ISBN)
Disputation
2019-03-08, Polhemsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:15 (Engelska)
Opponent
Handledare
Tillgänglig från: 2019-02-11 Skapad: 2019-01-21 Senast uppdaterad: 2019-02-19

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Wang, JunXinNilsson, Annica M.Fernandes, Daniel L. A.Niklasson, Gunnar A.

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