Probing of thermal transport in 50 nm thick PbTe nanocrystal films by time-domain thermoreflectance
Autor(a) principal: | |
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Data de Publicação: | 2018 |
Outros Autores: | , , , , , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/1822/57697 |
Resumo: | Bottom-up fabrication of thermoelectric (TE) materials from colloidal nanocrystal (NC) building blocks can substantially increase their TE efficiency, for example, by reducing lattice thermal conductivity. In this work, 10 nm spherical phase pure oleate-capped PbTe NCs with narrow size distribution were synthesized and employed to fabricate 50 nm thick films on insulating SiO2/Si substrates. The spin-coating, with subsequent ligand exchange procedure, was applied to enhance coupling interactions between the NCs. Using dark conductivity measurements, we confirmed the semiconducting behavior and the Schottky-type electrical field-dependent conductivity mechanism in the resultant thin films. The thermal transport in the thin film was probed by means of a time-domain thermoreflectance method. For this purpose, we used a customized state-of-the-art system based on a picosecond thermoreflectance instrument, which enables area-selective analysis with spatial resolution down to 5 mu m. The results show that the as-fabricated PbTe NC films exhibit ultralow thermal conductivity of 0.9 W m(-1) K-1 at 300 K. The transport property findings suggest potential in the proposed quick and cost-effective spin-coating strategy for bottom-up fabrication of nanostructured TE films from high-quality colloidal NC building blocks. |
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Probing of thermal transport in 50 nm thick PbTe nanocrystal films by time-domain thermoreflectanceThermoelectric-MaterialsThermopowerConductivityEngenharia e Tecnologia::Engenharia QuímicaEngenharia e Tecnologia::Engenharia dos MateriaisEngenharia e Tecnologia::NanotecnologiaScience & TechnologyBottom-up fabrication of thermoelectric (TE) materials from colloidal nanocrystal (NC) building blocks can substantially increase their TE efficiency, for example, by reducing lattice thermal conductivity. In this work, 10 nm spherical phase pure oleate-capped PbTe NCs with narrow size distribution were synthesized and employed to fabricate 50 nm thick films on insulating SiO2/Si substrates. The spin-coating, with subsequent ligand exchange procedure, was applied to enhance coupling interactions between the NCs. Using dark conductivity measurements, we confirmed the semiconducting behavior and the Schottky-type electrical field-dependent conductivity mechanism in the resultant thin films. The thermal transport in the thin film was probed by means of a time-domain thermoreflectance method. For this purpose, we used a customized state-of-the-art system based on a picosecond thermoreflectance instrument, which enables area-selective analysis with spatial resolution down to 5 mu m. The results show that the as-fabricated PbTe NC films exhibit ultralow thermal conductivity of 0.9 W m(-1) K-1 at 300 K. The transport property findings suggest potential in the proposed quick and cost-effective spin-coating strategy for bottom-up fabrication of nanostructured TE films from high-quality colloidal NC building blocks.M.P. would like to acknowledge INL for post-doctoral fellowship and thank Dr. E. Carbó-Argibay for his fruitful scientific and technical input on electron microscopy. This work was supported by FROnTHERA (NORTE-01-0145-FEDER-000023) project co-financed by European Union Funds, through Portuguese NORTE 2020 programme.info:eu-repo/semantics/publishedVersionAmerican Chemical SocietyUniversidade do MinhoPiotrowski, MarekFranco, MiguelSousa, VivianaRodrigues, JoséDeepak, Francis LeonardKakefuda, YoheiKawamoto, NaoyukiBaba, TetsuyaOwens-Baird, BryanAlpuim, P.Kovnir, KirillMori, TakaoKolen’ko, Yury V.2018-11-072018-11-07T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/1822/57697engJ. Phys. Chem. C 2018, 122, 48, 27127-27134.1932-744710.1021/acs.jpcc.8b04104https://pubs.acs.orginfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-07-21T12:11:05Zoai:repositorium.sdum.uminho.pt:1822/57697Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T19:02:47.921548Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Probing of thermal transport in 50 nm thick PbTe nanocrystal films by time-domain thermoreflectance |
title |
Probing of thermal transport in 50 nm thick PbTe nanocrystal films by time-domain thermoreflectance |
spellingShingle |
Probing of thermal transport in 50 nm thick PbTe nanocrystal films by time-domain thermoreflectance Piotrowski, Marek Thermoelectric-Materials Thermopower Conductivity Engenharia e Tecnologia::Engenharia Química Engenharia e Tecnologia::Engenharia dos Materiais Engenharia e Tecnologia::Nanotecnologia Science & Technology |
title_short |
Probing of thermal transport in 50 nm thick PbTe nanocrystal films by time-domain thermoreflectance |
title_full |
Probing of thermal transport in 50 nm thick PbTe nanocrystal films by time-domain thermoreflectance |
title_fullStr |
Probing of thermal transport in 50 nm thick PbTe nanocrystal films by time-domain thermoreflectance |
title_full_unstemmed |
Probing of thermal transport in 50 nm thick PbTe nanocrystal films by time-domain thermoreflectance |
title_sort |
Probing of thermal transport in 50 nm thick PbTe nanocrystal films by time-domain thermoreflectance |
author |
Piotrowski, Marek |
author_facet |
Piotrowski, Marek Franco, Miguel Sousa, Viviana Rodrigues, José Deepak, Francis Leonard Kakefuda, Yohei Kawamoto, Naoyuki Baba, Tetsuya Owens-Baird, Bryan Alpuim, P. Kovnir, Kirill Mori, Takao Kolen’ko, Yury V. |
author_role |
author |
author2 |
Franco, Miguel Sousa, Viviana Rodrigues, José Deepak, Francis Leonard Kakefuda, Yohei Kawamoto, Naoyuki Baba, Tetsuya Owens-Baird, Bryan Alpuim, P. Kovnir, Kirill Mori, Takao Kolen’ko, Yury V. |
author2_role |
author author author author author author author author author author author author |
dc.contributor.none.fl_str_mv |
Universidade do Minho |
dc.contributor.author.fl_str_mv |
Piotrowski, Marek Franco, Miguel Sousa, Viviana Rodrigues, José Deepak, Francis Leonard Kakefuda, Yohei Kawamoto, Naoyuki Baba, Tetsuya Owens-Baird, Bryan Alpuim, P. Kovnir, Kirill Mori, Takao Kolen’ko, Yury V. |
dc.subject.por.fl_str_mv |
Thermoelectric-Materials Thermopower Conductivity Engenharia e Tecnologia::Engenharia Química Engenharia e Tecnologia::Engenharia dos Materiais Engenharia e Tecnologia::Nanotecnologia Science & Technology |
topic |
Thermoelectric-Materials Thermopower Conductivity Engenharia e Tecnologia::Engenharia Química Engenharia e Tecnologia::Engenharia dos Materiais Engenharia e Tecnologia::Nanotecnologia Science & Technology |
description |
Bottom-up fabrication of thermoelectric (TE) materials from colloidal nanocrystal (NC) building blocks can substantially increase their TE efficiency, for example, by reducing lattice thermal conductivity. In this work, 10 nm spherical phase pure oleate-capped PbTe NCs with narrow size distribution were synthesized and employed to fabricate 50 nm thick films on insulating SiO2/Si substrates. The spin-coating, with subsequent ligand exchange procedure, was applied to enhance coupling interactions between the NCs. Using dark conductivity measurements, we confirmed the semiconducting behavior and the Schottky-type electrical field-dependent conductivity mechanism in the resultant thin films. The thermal transport in the thin film was probed by means of a time-domain thermoreflectance method. For this purpose, we used a customized state-of-the-art system based on a picosecond thermoreflectance instrument, which enables area-selective analysis with spatial resolution down to 5 mu m. The results show that the as-fabricated PbTe NC films exhibit ultralow thermal conductivity of 0.9 W m(-1) K-1 at 300 K. The transport property findings suggest potential in the proposed quick and cost-effective spin-coating strategy for bottom-up fabrication of nanostructured TE films from high-quality colloidal NC building blocks. |
publishDate |
2018 |
dc.date.none.fl_str_mv |
2018-11-07 2018-11-07T00:00:00Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/1822/57697 |
url |
http://hdl.handle.net/1822/57697 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
J. Phys. Chem. C 2018, 122, 48, 27127-27134. 1932-7447 10.1021/acs.jpcc.8b04104 https://pubs.acs.org |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
American Chemical Society |
publisher.none.fl_str_mv |
American Chemical Society |
dc.source.none.fl_str_mv |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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