Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/55843
Título: | Nano-sculptured Janus-like TiAg thin films obliquely deposited by GLAD co-sputtering for temperature sensing |
Autor(es): | Pedrosa, Paulo Eduardo Teixeira Baptista Ferreira, Armando José Barros Martin, Nicolas Yazdi, Mohammad Arab Pour Billard, Alain Lanceros-Méndez, S. Vaz, F. |
Palavras-chave: | Glancing angle co-deposition Electrical resistivity Anisotropy TCR Temperature sensing Janus-like TiAg films Nano-sculptured thin films |
Data: | 2018 |
Editora: | IOP Publishing |
Revista: | Nanotechnology |
Resumo(s): | Inclined, zigzag and spiral TiAg films were prepared by glancing angle co-deposition, using two distinct Ti and Ag targets with a particle incident angle of 80 degrees and Ag contents ranging from 20 to 75 at%. The effect of increasing Ag incorporation and columnar architecture change on the morphological, structural and electrical properties of the films was investigated. It is shown that inclined columnar features (beta = 47 degrees) with high porosity were obtained for 20 at% Ag, with the column angle sharply decreasing (beta = 21 degrees) for 50 at% Ag, and steeply increasing afterwards until beta = 37 degrees for the film with 75 at% Ag. The sputtered films exhibit a rather well-crystallized structure for Ag contents >= 50 at%, with a TiAg (111) preferential growth. No significant oxidation was detected in all films, except for the one with 20 at% Ag, after two 298-473-298 K temperature cycles in air. The calculated temperature coefficient of resistivity (TCR) values vary between 1.4 and 5.5 x 10(-4)K(-1). Nano-sculptured spiral films exhibit consistently higher resistivity (rho = 1.5. x 10(-6) Omega m) and TCR values (2.9 x 10(-4)K(-1)) than the inclined one with the same Ag content (rho = 1.2 x 10(-6) Omega m and TCR = 2.0 x 10(-4)K(-1)). No significant changes are observed in the zigzag films concerning these properties. The effective anisotropy A(eff) at 473 K changes from 1.3 to 1.7 for the inclined films. Spiral films exhibit an almost completely isotropic behavior with A(eff) = 1.1. Ag-rich TiAg core + shell Janus-like columns were obtained with increasing Ag concentrations. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/55843 |
DOI: | 10.1088/1361-6528/aacba8 |
ISSN: | 0957-4484 |
Arbitragem científica: | yes |
Acesso: | Acesso restrito UMinho |
Aparece nas coleções: | CDF - GRF - Artigos/Papers (with refereeing) |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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Nano-sculptured Janus-like TiAg thin films obliquely deposited by GLAD co-sputtering for.pdf Acesso restrito! | 3,08 MB | Adobe PDF | Ver/Abrir |