Nanoscale Res Lett. 2009 Sep 17;4(11):1358-64. doi: 10.1007/s11671-009-9405-8.
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 degrees 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 sp(2) carbon at the Raman spectrum of both samples.
通过热分解 Ag(I)/丙二酸盐合成了嵌入碳基质中的球形银纳米粒子。在高压釜中于 300°C 下热解或在回流温度下在二甲苯悬浮液中热解形成的银纳米粒子，对石墨层的形成具有催化作用。两个反应都是通过银阳离子的原位还原和中心乙炔三键的聚合进行的，并且可以通过 DTA 分析监测反应的确切温度。有趣的是，通过 HR-TEM 分析证实，这种银盐在二甲苯中的热分解部分导致了准晶银的微量形成。HR-TEM 图像中清晰可见覆盖在银纳米粒子上的石墨层，并且通过两个样品的拉曼光谱中存在 sp(2)碳进一步证实了这一点。
