Athanassiou E K, Grass R N, Stark W J
Institute for Chemical and Bioengineering, ETH Zurich, 8093 Zurich, Switzerland.
Nanotechnology. 2006 Mar 28;17(6):1668-73. doi: 10.1088/0957-4484/17/6/022. Epub 2006 Feb 27.
Copper nanoparticles with a mean carbon coating of about 1 nm were continuously produced at up to 10 g h(-1) using a modified flame spray synthesis unit under highly reducing conditions. Raman spectroscopy and solid state (13)C magic angle spinning nuclear magnetic resonance spectroscopy revealed that the thin carbon layer consisted of a sp(2)-hybridized carbon modification in the form of graphene stacks. The carbon layer protected the copper nanoparticles from oxidation in air. Bulk pills of pressed carbon/copper nanoparticles displayed a highly pressure- and temperature-dependent electrical conductivity with sensitivity at least comparable to commercial materials. These properties suggest the use of thin carbon/copper nanocomposites as novel, low-cost sensor materials and offer a metal-based alternative to the currently used brittle oxidic spinels or perovskites.
使用改进的火焰喷雾合成装置，在高度还原条件下，以高达10 g h⁻¹的速率连续生产平均碳涂层约为1 nm的铜纳米颗粒。拉曼光谱和固态¹³C魔角旋转核磁共振光谱表明，薄碳层由石墨烯堆叠形式的sp²杂化碳变体组成。碳层保护铜纳米颗粒在空气中不被氧化。压制的碳/铜纳米颗粒块状丸剂表现出高度依赖压力和温度的电导率，其灵敏度至少与商业材料相当。这些特性表明，薄碳/铜纳米复合材料可作为新型低成本传感器材料使用，并为目前使用的脆性氧化物尖晶石或钙钛矿提供了一种基于金属的替代品。
