Skip navigation
Universidade de Brasília
Use este identificador para citar ou linkar para este item: http://repositorio2.unb.br/jspui/handle/10482/46712
Arquivos associados a este item:
Não existem arquivos associados a este item.
Registro completo de metadados
Campo DCValorIdioma
dc.contributor.authorQuispe, Luis T.-
dc.contributor.authorMamani, L. G. Luza-
dc.contributor.authorBaldarrago Alcantara, Apuniano Aman-
dc.contributor.authorLeón Félix, Lizbet-
dc.contributor.authorGoya, Gerardo F.-
dc.contributor.authorFuentes Garcia, Jesus Antonio-
dc.contributor.authorPacheco Salazar, David G.-
dc.contributor.authorHuamaní Coaquira, José Antonio-
dc.date.accessioned2023-10-23T14:33:00Z-
dc.date.available2023-10-23T14:33:00Z-
dc.date.issued2022-05-25-
dc.identifier.citationQUISPE, Luis T. et al. Synthesis and characterization of α-Fe 2O 3 nanoparticles showing potential applications for sensing quaternary ammonium vapor at room temperature. Nanotechnology, v. 33, n. 33, 2022. DOI: https://doi.org/10.1088/1361-6528/ac6c93.pt_BR
dc.identifier.urihttp://repositorio2.unb.br/jspui/handle/10482/46712-
dc.language.isoengpt_BR
dc.publisherIOP Publishing Ltdpt_BR
dc.rightsAcesso Restritopt_BR
dc.titleSynthesis and characterization of α-Fe 2O 3 nanoparticles showing potential applications for sensing quaternary ammonium vapor at room temperaturept_BR
dc.typeArtigopt_BR
dc.subject.keywordNanopartículas de hematitapt_BR
dc.subject.keywordCompostos de amônio quaternáriopt_BR
dc.subject.keywordSensor de gás à temperatura ambientept_BR
dc.identifier.doihttps://doi.org/10.1088/1361-6528/ac6c93pt_BR
dc.relation.publisherversionhttps://iopscience.iop.org/article/10.1088/1361-6528/ac6c93pt_BR
dc.description.abstract1P-type and n-type metal oxide semiconductors are widely used in the manufacture of gas sensing materials, due to their excellent electronic, electrical and electrocatalytic properties. Hematite (α-Fe2O3) compound has been reported as a promising material for sensing broad types of gases, due to its affordability, good stability and semiconducting properties. In the present work, the efficient and easy-to-implement sol-gel method has been used to synthesize α-Fe2O3 nanoparticles (NPs). The TGA-DSC characterizations of the precursor gel provided information about the phase transformation temperature and the mass percentage of the hematite NPs. X-ray diffraction, transmission electron microscopy and x-ray photoelectron spectroscopy data analyses indicated the formation of two iron oxide phases (hematite and magnetite) when the NPs are subjected to thermal treatment at 400 °C. Meanwhile, only the hematite phase was determined for thermal annealing above 500 °C up to 800 °C. Besides, the crystallite size shows an increasing trend with the thermal annealing and no defined morphology. A clear reduction of surface defects, associated with oxygen vacancies was also evidenced when the annealing temperature was increased, resulting in changes on the electrical properties of hematite NPs. Resistive gas-sensing tests were carried out using hematite NPs + glycerin paste, to detect quaternary ammonium compounds. Room-temperature high sensitivity values (Sr ∼ 4) have been obtained during the detection of ∼1 mM quaternary ammonium compounds vapor. The dependence of the sensitivity on the particle size, the mass ratio of NPs with respect to the organic ligand, changes in the dielectric properties, and the electrical conduction mechanism of gas sensing was discussed.pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0003-0824-4184pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0003-4946-2962pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0001-9392-4592pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0003-4952-3702pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0003-4952-3702pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0003-4685-2244pt_BR
dc.contributor.affiliationUniversidad Nacional de San Agustín de Arequipa, Escuela Profesional de Física, Laboratorio de Películas Delgadaspt_BR
dc.contributor.affiliationUniversidad Nacional de San Agustín de Arequipa, Escuela Profesional de Física, Laboratorio de Películas Delgadaspt_BR
dc.contributor.affiliationUniversidad Nacional de San Agustín de Arequipa, Escuela Profesional de Física, Laboratorio de Películas Delgadaspt_BR
dc.contributor.affiliationUniversidad Nacional de San Agustín de Arequipa, Escuela Profesional de Física, Laboratorio de Películas Delgadaspt_BR
dc.contributor.affiliationCSIC-Universidad de Zaragoza, Instituto de Nanociencia y Materiales de Aragón (INMA)pt_BR
dc.contributor.affiliationCSIC-Universidad de Zaragoza, Instituto de Nanociencia y Materiales de Aragón (INMA)pt_BR
dc.contributor.affiliationUniversidad Nacional de San Agustín de Arequipa, Escuela Profesional de Física, Laboratorio de Películas Delgadaspt_BR
dc.contributor.affiliationUniversidade de Brasília, Instituto de Física, Laboratory of Magnetic Characterizationpt_BR
dc.description.unidadeInstituto de Física (IF)pt_BR
Aparece nas coleções:Artigos publicados em periódicos e afins

Mostrar registro simples do item Visualizar estatísticas



Os itens no repositório estão protegidos por copyright, com todos os direitos reservados, salvo quando é indicado o contrário.