resumo
The past decade has seen significant progresses in the ability to fabricate new mesoporous thin films with highly controlled pore systems and emerging applications in sensing, electrical and thermal isolation, microfluidics, solar cells engineering, energy storage, and catalysis. Heat management at the micro- and nanoscale is a key issue in most of these applications, requiring a complete thermal characterization of the films that is commonly performed using electrical methods. Here, plasmonic-induced heating (through Au NPs) is combined with Tb3+/Eu3+ luminescence thermometry to measure the thermal conductivity of silica and titania mesoporous nanolayers. This innovative method yields values in accord with those measured by the evasive and destructive conventional 3 omega-electrical method, simultaneously overcoming their main limitations, for example, a mandatory deposition of additional isolating and metal layers over the films and the previous knowledge of the thermal contact resistance between the heating and the mesoporous layers.
palavras-chave
GOLD NANOPARTICLES; HEAT-TRANSFER; FILMS; CONDUCTIVITY; NANOSCALE; TRANSPORT; NANOTHERMOMETRY; CONVERSION
categoria
Chemistry; Science & Technology - Other Topics; Materials Science; Physics
autores
Brites, CDS; Fuertes, MC; Angelome, PC; Martinez, ED; Lima, PP; Soler-Illia, GJAA; Carlos, LD
nossos autores
Carlos Brites
Professor associado
Luís Carlos
Professor Catedrático
Patrícia Pereira Lima
Bolseiro de pós-DoutoramentoProjectos
agradecimentos
Financial support of Fundacao para a Ciencia e a Tecnologia (FCT, Portugal) (PTDC/CTM-NAN/4647/2014 and POCI-01-0145-FEDER-016687) is acknowledged. This work was developed within the scope of the project CICECO-Aveiro Institute of Materials, POCI-01-0145-FEDER-007679 (FCT, UID/CTM/50011/2013), financed by Portuguese funds through FCT/MEC (Ministerio da Educacao e Ciencia) and when appropriate cofinanced by FEDER under the PT2020 Partnership Agreement. Funding was also provided by Argentina agencies CONICET (PIP00044CO) and ANPCyT (PICT 2012-2087). C.D.S.B. (SFRH/BPD/89003/2012) and E.D.M. thank FCT and CONICET, respectively, for the postdoctoral grants. The authors acknowledge the help of Ricardo Longo (UFPE, Recife, Brazil) and Pedro Paulo (IST-UL, Portugal) with the calculus of the absorption coefficient of Au NPs.