2o SIMTEQ
Química de Coordenação: o legado de Alfred Werner
26 a 28 de agosto de 2013
Local: Departamento de Química
Universidade Federal de Minas Gerais, Belo Horizonte/MG
http://simteq.qui.ufmg.br
Aldo Gorgatti Zarbin
Department of Chemistry, Federal University of Parana (UFPR), Curitiba, PR, Brazil
Email: [email protected]
Multifunctional materials based on carbon nanotubes/Prussian
blue nanocomposites
Nanocomposite materials formed by the combination of Prussian Blue (PB)
and carbon nanotubes (CNTs) have several interesting properties. PB has a
general
formula
FeIII4[FeII(CN)6]3.nH2O
and
presents
important
redox,
ferromagnetic and multi-electrochromic properties. We recently developed an
innovative route to prepare a CNT/PB composite materials with high sensitivity to
H2O2 detection, based on an in situ electrochemical reaction between the ironbased compounds present in the cavities of carbon nanotubes [1,2] and the
ferricyanide ions in solution [3,4]. This approach can be used to prepare different
kind of electrodes, including transparent and electrochromic electrodes, and has
been extended to other kind of ferricianide compounds, as Ruthenium-based
analogues of PB [5]. All the synthetic routes involved in the process, starting from
the synthesis of CNTs and going to the preparation and characterization of the
nanocomposites will be discussed in this talk. Characterization by cyclic
voltammetry, UV-Vis spectroscopy, XRD, SEM, surface plasmon resonance, AFM
and Raman spectroscopy will be presented, and the results will be discussed
based on the chemical interaction between the PBs and the CNTs. A model of the
PB growth over the CNTs wall will be proposed. Application as electrochemical
sensor (as for example for hydrogen peroxide, in which the sensors demonstrated
1
very low detection limits - 4.6010-9 mol L-1 - and very high sensitivity - 97.2 A cm-2
M-1- which represents one of the best response ever described in the literature for
this kind of sensor), electrochromic material [6], electrocatalyst for environmental
application [7] and in neuroscience [8] will be also presented, and the results
compared to the obtained using neat PBs films.
ACKNOWLEDGMENTS: National Institute of Science and Technology of Carbon
Nanomaterials, CNPq, CAPES, Fundação Araucária (Pronex/NENNAM).
References
[1] M.C. Schnitzler, M.M. Oliveira, D. Ugarte, A.J.G. Zarbin, Chem. Phys. Lett.,
2003.
[2] M.C. Schnitzler, A.S. Mangrich, W.A.A. Macedo, J.D. Ardisson, A.J.G. Zarbin,
Inorg. Chem. 2006.
[3] E, Nossol, A.J.G. Zarbin, Adv. Funct. Mater., 2009.
[4] E. Nossol, A.J.G. Zarbin, J. Mater. Chem. 2012.
[5] S. Husmann, E. Nossol, A.J.G. Zarbin, submitted, 2012.
[6] E. Nossol, A.J.G. Zarbin, Sol. Energy Mater. Sol. Cell, 2013.
[7] E. Nossol, A. Mossol, A.J.G. Zarbin, A. Bond, RSC Adv., 2013.
[8] S. Husmann, C. Cunha, A.J.G. Zarbin, MS in preparation.
2