Alicante, Spain
Alicante, Spain

Time filter

Source Type

Lavin-Lopez M.P.,University of Castilla - La Mancha | Valverde J.L.,University of Castilla - La Mancha | Cuevas M.C.,University of Castilla - La Mancha | Garrido A.,Graphenano Nanotechnologies | And 3 more authors.
Physical Chemistry Chemical Physics | Year: 2014

The optimization of graphene growth on copper foils using an atmospheric pressure chemical vapor deposition setup is reported. CH4 and H 2 were used as precursor gases and Raman spectroscopy as the main graphene characterization technique. Different growth parameters, including temperature and reaction time, the molar ratio of CH4/H2 in the feed and total flow of gases during the reaction step, were studied in detail. It was shown that graphene growth was not homogeneous in the entire sample, multilayer graphene was present in most of the sample, however as the synthesis parameters were optimized, graphene gained better quality, obtaining bilayer graphene over most of the sheet in the final optimized sample. Homemade software was used to analyze the quality of the synthesised graphene, obtaining a more quality graphene according to the synthesis parameters optimized. An optimal bilayer graphene sample was prepared at the lowest growth time (10 min) and the highest synthesis temperature (1050 °C), using a CH 4/H2 flow ratio and a total flow rate ratio of precursors of 7% and 60 Nml (CH4 + H4) per min respectively. This journal is © the Owner Societies 2014.


Lavin-Lopez M.P.,Graphenano Nanotechnologies | Valverde J.L.,University of Castilla - La Mancha | Garrido A.,Graphenano Nanotechnologies | Sanchez-Silva L.,University of Castilla - La Mancha | And 2 more authors.
Chemical Physics Letters | Year: 2014

Novel and simple etchings for direct transfer of CVD-grown graphene on Cu to arbitrary substrates are reported in this paper. Besides the classical transfer method using FeCl3, two novel etching solutions have been used for depositing graphene over different substrates: HF:2Na2CO3·3H2O2 (4:1) and H2O2 (30% p./v.):aqua Regis (1HNO3:3HCl):H2O (1:1:2). By using these etching solutions, graphene was firstly transferred to PET wafers and then to arbitrary substrates (microscope slides). The resulting materials were analyzed and discussed in detail using Raman Spectroscopy. © 2014 Elsevier B.V. All rights reserved.

Loading Graphenano Nanotechnologies collaborators
Loading Graphenano Nanotechnologies collaborators