Fabrication and Characterization of Inorganic Silver and Palladium Nanostructures within Hexagonal Cylindrical Channels of Mesoporous Carbon

Polymers

Jheng-Guang Li¹  Cheng-Ying Tsai¹ 

[1] Department of Materials and Optoelectronic Science, Center for Functional Polymers and Supramolecular Materials, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan;

关键词: mesoporous carbon;    PEO–POSS;    inorganic nanometals;    Raman spectroscopy;   

DOI  :  10.3390/polym6061794

来源: mdpi

【 摘 要 】

In this study, we prepared a mesoporous carbon with hexagonally packed mesopores through evaporation-induced self-assembly (EISA)—with the diblock copolymer poly(ethylene oxide-b-ε-caprolactone) (PEO-b-PCL) as the template (EO₁₁₄CL₈₄), phenolic resin as the carbon precursor, hexamethylenetetramine (HMTA) as the curing agent, and star octakis-PEO-functionalized polyhedral oligomeric silsesquioxane (PEO–POSS) as the structure modifier—and subsequent carbonization. We then took the cylindrical mesoporous carbon as a loading matrix, with AgNO₃ and Pd(NO₃)₂ as metal precursors, to fabricate Ag nanowire/mesoporous carbon and Pd nanoparticle/mesoporous carbon nanocomposites, respectively, through an incipient wetness impregnation method and subsequent reduction under H₂. We used transmission electron microscopy, electron diffraction, small-angle X-ray scattering, N₂ isotherm sorption experiment, Raman spectroscopy, and power X-ray diffraction to investigate the textural properties of these nanometal/carbon nanocomposites. Most notably, the Raman spectra of the cylindrical mesoporous carbon, Ag/mesoporous carbon, and Pd/mesoporous carbon revealed interesting phenomena in terms of the ratios of the intensities of the D and G bands (I_D/I_G), the absolute scattering intensities, and the positions of the D bands.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.