TY - JOUR
T1 - Synthesis of highly dispersed platinum particles on carbon nanotubes by an in situ vapor-phase method
AU - Mercado-Zúñiga, C.
AU - Vargas-García, J. R.
AU - Hernández-Pérez, M. A.
AU - Figueroa-Torres, M. Z.
AU - Cervantes-Sodi, F.
AU - Torres-Martínez, L. M.
N1 - Publisher Copyright:
© 2014 Elsevier B.V. All rights reserved.
PY - 2015/1/15
Y1 - 2015/1/15
N2 - Highly dispersed Pt nanoparticles were prepared on functionalized multi-walled carbon nanotubes (f-MWCNTs) using a simple in situ vapor-phase method. The method consisted in two-step procedure in which an initial mixture of Pt precursor (Pt-acac) and f-MWCNTs was heated in a quartz tube reactor, first at 180 °C and then at 400 °C. Fourier transform infrared spectroscopy (FTIR-ATR), thermal gravimetric analysis (TGA) and X-ray diffraction (XRD) were used to follow the chemical and structural transformations of mixture components during heating steps. The functionalization of MWCNTs with HNO3/H2SO4 solution resulted in formation of surface carbonyl groups. The FTIR-ATR and XRD results indicated that individual Pt-acac withstood heating at 180 °C, whereas it was dissociated when heated in contact with f-MWCNTs at the same temperature. Thus, the functional carbonyl groups were found to be responsible for assisted decomposition of Pt-acac at 180 °C. Since carbonyl groups served as reaction sites for decomposition of Pt-acac, the resulting particles were highly and homogeneously dispersed on the surface of MWCNTs even the relatively high metallic loading of 27 wt%. TEM observations revealed that crystalline Pt particles exhibit narrow size distribution with a mean size of 2.3 nm.
AB - Highly dispersed Pt nanoparticles were prepared on functionalized multi-walled carbon nanotubes (f-MWCNTs) using a simple in situ vapor-phase method. The method consisted in two-step procedure in which an initial mixture of Pt precursor (Pt-acac) and f-MWCNTs was heated in a quartz tube reactor, first at 180 °C and then at 400 °C. Fourier transform infrared spectroscopy (FTIR-ATR), thermal gravimetric analysis (TGA) and X-ray diffraction (XRD) were used to follow the chemical and structural transformations of mixture components during heating steps. The functionalization of MWCNTs with HNO3/H2SO4 solution resulted in formation of surface carbonyl groups. The FTIR-ATR and XRD results indicated that individual Pt-acac withstood heating at 180 °C, whereas it was dissociated when heated in contact with f-MWCNTs at the same temperature. Thus, the functional carbonyl groups were found to be responsible for assisted decomposition of Pt-acac at 180 °C. Since carbonyl groups served as reaction sites for decomposition of Pt-acac, the resulting particles were highly and homogeneously dispersed on the surface of MWCNTs even the relatively high metallic loading of 27 wt%. TEM observations revealed that crystalline Pt particles exhibit narrow size distribution with a mean size of 2.3 nm.
KW - Nanostructured materials
KW - Optical spectroscopy
KW - Thermal analysis
UR - http://www.scopus.com/inward/record.url?scp=84907524554&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2014.02.106
DO - 10.1016/j.jallcom.2014.02.106
M3 - Artículo
SN - 0925-8388
VL - 615
SP - S538-S541
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
IS - S1
ER -