Light-heat conversion dynamics in highly diversified water-dispersed hydrophobic nanocrystal assemblies

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dc.creatorAndrea Mazzanti
dc.creatorGiuseppe Della Valle
dc.creatorMarie-Paule Pileni
dc.creatorZhijie Yang
dc.creatorNailiang Yang
dc.creatorGiancarlo Rizza
dc.creatorPierre-Eugène Coulon
dc.creatorCristian Manzoni
dc.creatorAna Maria de Paula
dc.creatorGiulio Cerullo
dc.creatorMychel Gonçalves Silva
dc.date.accessioned2023-03-03T17:01:05Z
dc.date.accessioned2025-09-09T00:02:07Z
dc.date.available2023-03-03T17:01:05Z
dc.date.issued2019
dc.description.sponsorshipCNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológico
dc.description.sponsorshipFAPEMIG - Fundação de Amparo à Pesquisa do Estado de Minas Gerais
dc.description.sponsorshipCAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
dc.format.mimetypepdf
dc.identifier.doihttps://doi.org/10.1073/pnas.1817850116
dc.identifier.issn1091-6490
dc.identifier.urihttps://hdl.handle.net/1843/50636
dc.languageeng
dc.publisherUniversidade Federal de Minas Gerais
dc.rightsAcesso Aberto
dc.subjectNanocristais
dc.subjectEspectroscopia ótica
dc.subjectLuz
dc.subjectCalor
dc.subject.otherNanocrystal
dc.subject.otherOptical spectroscopy
dc.subject.otherLight
dc.subject.otherHeat
dc.titleLight-heat conversion dynamics in highly diversified water-dispersed hydrophobic nanocrystal assemblies
dc.typeArtigo de periódico
local.citation.epage3
local.citation.issue17
local.citation.spage1
local.citation.volume116
local.description.resumoWe investigate, with a combination of ultrafast optical spectroscopy and semiclassical modeling, the photothermal properties of various water-soluble nanocrystal assemblies. Broadband pump–probe experiments with ∼100-fs time resolution in the visible and near infrared reveal a complex scenario for their transient optical response that is dictated by their hybrid composition at the nanoscale, comprising metallic (Au) or semiconducting (Fe3O4) nanostructures and a matrix of organic ligands. We track the whole chain of energy flow that starts from light absorption by the individual nanocrystals and subsequent excitation of out-of-equilibrium carriers followed by the electron–phonon equilibration, occurring in a few picoseconds, and then by the heat release to the matrix on the 100-ps timescale. Two-dimensional finite-element method electromagnetic simulations of the composite nanostructure and multitemperature modeling of the energy flow dynamics enable us to identify the key mechanism presiding over the light–heat conversion in these kinds of nanomaterials. We demonstrate that hybrid (organic–inorganic) nanocrystal assemblies can operate as efficient nanoheaters by exploiting the high absorption from the individual nanocrystals, enabled by the dilution of the inorganic phase that is followed by a relatively fast heating of the embedding organic matrix, occurring on the 100-ps timescale.
local.identifier.orcidhttps://orcid.org/0000-0002-3194-2717
local.identifier.orcidhttps://orcid.org/0000-0003-0117-2683
local.identifier.orcidhttps://orcid.org/0000-0002-5708-8379
local.identifier.orcidhttps://orcid.org/0000-0002-8770-3600
local.identifier.orcidhttps://orcid.org/0000-0002-4169-8869
local.identifier.orcidhttps://orcid.org/0000-0002-8551-5948
local.identifier.orcidhttps://orcid.org/0000-0002-9534-2702
local.identifier.orcidhttps://orcid.org/0000-0001-6221-6286
local.publisher.countryBrasil
local.publisher.departmentICX - DEPARTAMENTO DE FÍSICA
local.publisher.initialsUFMG
local.url.externahttps://www.pnas.org/doi/full/10.1073/pnas.1817850116

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