resumo
An innovation is reported in the synthesis of a hybrid carbon structure resulting from the simultaneous growth of graphene and nanocrystalline diamond (NCD) by the microwave plasma chemical vapor deposition technique. This strategy allows to take advantage of the complementary electronic behavior of each carbon allotrope, a key feature in new nanostructured materials for electronics under the graphene/insulator all-carbon approach. The graphene-diamond hybrid structures were grown on copper and transferred to a glass substrate to be further characterized. Raman analysis puts in evidence the signature of both phases and the high crystallinity of the graphene layer, based on band intensity and width measurements. Raman mapping and SEM observations show a uniform distribution of the NCD clusters, confirmed by AFM/EFM measurements. Additionally, HRTEM analysis permitted to detail the diamond nanocrystalline structure, revealing a close link to the graphene layer on the basis of which a diamond on graphene nucleation mechanism is proposed. (C) 2015 Elsevier Ltd. All rights reserved.
palavras-chave
RAMAN-SPECTROSCOPY; LAYER GRAPHENE; CARBON; TRANSISTORS; NANOTUBES; DEFECTS; CU
categoria
Chemistry; Materials Science
autores
Carvalho, AF; Holz, T; Santos, NF; Ferro, MC; Martins, MA; Fernandes, AJS; Silva, RF; Costa, FM
nossos autores
Manuel António Martins da Silva
Investigador
Marta Ascenção Carmona Ferro
Técnico de Laboratório
Nuno Miguel Franco dos Santos
Estudante de doutoramento
Rui Ramos Ferreira e Silva
Professor associadoGrupos
G1 - Materiais Porosos e Nanossistemas
G3 - Materiais Eletroquímicos, Interfaces e Revestimentos
agradecimentos
This work was developed in the scope of the projects PTDC/CTM-NAN/117284/2010 (FCOMP-01-0124-FEDER-020025), and UID/CTM/50011/2013, financed by national funds through the FCT/MEC and co-financed by FEDER under the PT2020 Partnership Agreement. N. F. Santos acknowledges financial support from the FCT PhD grant SFRH/BD/90017/2012. Manuel A. Martins acknowledges FCT for the postdoctoral grant SFRH/BPD/89563/2012.