Field emission properties of the graphenated carbon nanotube electrode

Autor(es)

Zanin, H. ^[1] ; Ceragioli, H. J. ^[2] ; Peterlevitz, A. C. ^[2] ; Baranauskas, Vitor ^[2] ; Marciano, F. R. ^[3] ; Lobo, A. O. ^[3]

Afiliação do(s) autor(es)

^[1] Univ Bristol, Sch Chem, Bristol BS8 1TS, Avon - England

^[2] Univ Estadual Campinas, Fac Elect & Comp Engn, Dept Semicond Instrumentos & Foton, BR-13083852 Campinas, SP - Brazil

^[3] UNIVAP, Inst Res & Dev, Lab Biomed Nanotechnol, BR-12244000 Sao Jose Dos Campos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Applied Surface Science; v. 324, p. 174-178, JAN 1 2015.
• Citações Web of Science: 6

Resumo

Reduced graphene oxide-coated carbon nanotubes (RGO-CNT) electrodes have been prepared by hot filament chemical vapour deposition system in one-step growth process. We studied RGO-CNT electrodes behaviour as cold cathode in field emission test. Our results show that RGO-CNT retain the low threshold voltage typical of CNTs, but with greatly improved emission current stability. The field emission enhancement value is significantly higher than that expected being caused by geometric effect (height divided by the radius of nanotube). This suggested that the field emission of this hybrid structure is not only from a single tip, but eventually it is from several tips with contribution of graphene nanosheets at CNT's walls. This phenomenon explains why the graphenated carbon nanotubes do not burn out as quickly as CNT does until emission ceases completely. These preliminaries results make nanocarbon materials good candidates for applications as electron sources for several devices. (C) 2014 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 11/20345-7 - Estudo de filmes de carbono-tipo diamante contendo nanopartículas incorporadas para aplicações biomédicas
• Beneficiário: Fernanda Roberta Marciano
• Linha de fomento: Auxílio à Pesquisa - Apoio a Jovens Pesquisadores
• Processo FAPESP: 11/17877-7 - Desenvolvimento de novos scaffolds poliméricos por eletrofiação com incorporação de nanotubos alinhados e nanohidroxiapatita para regeneração óssea
• Beneficiário: Anderson de Oliveira Lobo
• Linha de fomento: Auxílio à Pesquisa - Apoio a Jovens Pesquisadores
• Processo FAPESP: 14/02163-7 - Desenvolvimento de dispositivos supercapacitores a partir de grafenos, nanotubos de carbono e diamantes
• Beneficiário: Hudson Giovani Zanin
• Linha de fomento: Auxílio à Pesquisa - Apoio a Jovens Pesquisadores