Silver Nanoparticles and Graphitic Carbon Through Thermal Decomposition of a Silver/Acetylenedicarboxylic Salt
1 Institute of Materials Science, NCSR ‘Demokritos’, 15310, Athens, Greece
2 Department of Physics, Aristotle University of Thessaloniki, Thessaloniki, Greece
3 Department of Materials Science and Engineering, University of Ioannina, Ioannina, Greece
Nanoscale Research Letters 2009, 4:1358-1364 doi:10.1007/s11671-009-9405-8Published: 17 September 2009
Spherically shaped silver nanoparticles embedded in a carbon matrix were synthesized by thermal decomposition of a Ag(I)/acetylenedicarboxylic acid salt. The silver nanoparticles, which are formed either by pyrolysis at 300 °C in an autoclave or thermolysis in xylene suspension at reflux temperature, are acting catalytically for the formation of graphite layers. Both reactions proceed through in situ reduction of the silver cations and polymerization of the central acetylene triple bonds and the exact temperature of the reaction can be monitored through DTA analysis. Interestingly, the thermal decomposition of this silver salt in xylene partly leads to a minor fraction of quasicrystalline silver, as established by HR-TEM analysis. The graphitic layers covering the silver nanoparticles are clearly seen in HR-TEM images and, furthermore, established by the presence of sp2carbon at the Raman spectrum of both samples.