A
Alexandre Rocha Paschoal
Researcher at Federal University of Ceará
Publications - 40
Citations - 449
Alexandre Rocha Paschoal is an academic researcher from Federal University of Ceará. The author has contributed to research in topics: Raman spectroscopy & Chemistry. The author has an hindex of 9, co-authored 30 publications receiving 293 citations. Previous affiliations of Alexandre Rocha Paschoal include Massachusetts Institute of Technology.
Papers
More filters
Journal ArticleDOI
Raman evidence for pressure-induced formation of diamondene
Luiz Gustavo Pimenta Martins,Luiz Gustavo Pimenta Martins,Matheus J. S. Matos,Alexandre Rocha Paschoal,Paulo Freire,N. F. Andrade,A. L. Aguiar,Jing Kong,Bernardo R. A. Neves,Alan B. de Oliveira,Mario S. C. Mazzoni,Antonio G. Souza Filho,Luiz Gustavo Cançado +12 more
TL;DR: Spectroscopic evidence for the formation of diamondene is provided by performing Raman spectroscopy of double-layer graphene under high pressure and is explained in terms of a breakdown in the Kohn anomaly associated with the finite size of the remaining graphene sites surrounded by the diamondene matrix.
Journal ArticleDOI
The effect of cobalt substitution in crystal structure and vibrational modes of CuFe2O4 powders obtained by polymeric precursor method
M. D. P. Silva,Fernando Carvalho Silva,F. S. M. Sinfrônio,Alexandre Rocha Paschoal,E.N. Silva,Carlos William de Araujo Paschoal,Carlos William de Araujo Paschoal +6 more
TL;DR: In this paper, X-ray powder diffraction was used to confirm the ideal inverse spinel structure for CoFe2O4 sample and the tetragonal distorted inverse spinels structure for CuFe 2 O4 sample, and the optical active modes were determined by infrared and Raman spectroscopy.
Journal ArticleDOI
Pressure-Induced Selectivity for Probing Inner Tubes in Double- and Triple-Walled Carbon Nanotubes: A Resonance Raman Study
Rafael S. Alencar,A. L. Aguiar,A. L. Aguiar,Alexandre Rocha Paschoal,Paulo Freire,Yoong Ahm Kim,Hiroyuki Muramatsu,Morinobu Endo,Humberto Terrones,Humberto Terrones,Mauricio Terrones,Mauricio Terrones,Alfonso San-Miguel,M. S. Dresselhaus,A. G. Souza Filho +14 more
TL;DR: In this article, the dependence of the radial breathing modes and the tangential mode (G-band) of triple-wall carbon nanotubes (TWCNTs) under hydrostatic pressure is reported.
Journal ArticleDOI
Anharmonicity and Universal Response of Linear Carbon Chain Mechanical Properties under Hydrostatic Pressure
Keshav Sharma,Nathalia Leal Marinho Costa,Yoong Ahm Kim,Hiroyuki Muramatsu,Newton M. Barbosa Neto,Luiz Gustavo Pimenta Martins,Jing Kong,Alexandre Rocha Paschoal,Paulo T. Araujo,Paulo T. Araujo +9 more
TL;DR: A simple anharmonic force-constant model shows that the LCCs' Young's modulus, Grüneisen parameter, and strain follow universal P^{-1} and P^{2} laws, respectively.
Journal ArticleDOI
Mechanisms of Colloidal Stabilization of Oxidized Nanocarbons in the Presence of Polymers: Obtaining Highly Stable Colloids in Physiological Media
Gislaine Cristina Padovani,Romana Petry,Camila de Araújo Holanda,Francisco A. Sousa,Viviane M. Saboia,Cristiane A. Silva,Alexandre Rocha Paschoal,Antonio G. Souza Filho,Amauri J. Paula +8 more
TL;DR: In this article, the mechanism of stabilization for oxidized carbon nanotubes (CNTs) and graphene oxide (GO) in the presence of Pluronic F-127 (PF127) and short and long-chain polyethylene glycol (PEG 1500 or 35000) was investigated.