Abstract
Ni/NiO nanoparticles were synthesized by metal organics chemical vapor deposition of nickel acetylacetonate in an externally heated tube flow reactor at moderate temperatures, up to 500°C. Particle production and characteristics were studied by evaluating the effects of reactor temperature, precursor concentration, and flow rate through the reactor. In addition, two precursor decomposition methods were examined: thermal decomposition and reduction by hydrogen. Particle production was monitored with a scanning mobility particle sizer, and particle characteristics were studied using transmission electron microscopy, high resolution transmission electron microscopy, selected area electron diffraction, and energy dispersive spectroscopy. The presence of hydrogen in the reaction mixture influenced significantly both particle production and their characteristics.
Highlights
Nickel and nickel oxide nanoparticles show many unique optical, magnetic, electrical and chemical properties [1,2], and these nanoparticles have great potential in applications such as ceramic materials, electronic components, sensors, magnetic data storage materials and catalysts [3,4]
We studied Ni/NiO nanoparticle synthesis in an externally heated tube flow reactor at moderate temperatures using nickel acetylacetonate (NiAA) as a precursor and two different methods of precursor decompositions
Particle generation was monitored by SMPS in the form of particle size distribution (PSD) curves, including the following statistics: total number concentration (Nt), geometric mean diameter (GMD), geometric standard deviation (GSD), etc
Summary
Nickel and nickel oxide nanoparticles show many unique optical, magnetic, electrical and chemical properties [1,2], and these nanoparticles have great potential in applications such as ceramic materials, electronic components, sensors, magnetic data storage materials and catalysts [3,4]. Ni/NiO nanoparticles can be synthesized in the gas phase, and several variants of this method have been used for the preparation of nickel or nickel oxide nanoparticles. Lenggoro et al [3] developed conditions for synthesizing NiO nanoparticles with controlled morphology by using low-pressure spray pyrolysis with a filter expansion aerosol generator [3]. Suh et al synthesized nickel nanoparticles in a tubular furnace reactor reducing NiCl2 with hydrogen (present in a carrier gas) [2]. Another method for preparing Ni/NiO nanostructures is chemical vapor deposition (CVD) of metal organic precursors (MOCVD). MOCVD has a number of advantages over other methods: the process is relatively simple, it uses inexpensive equipment, and particle formation can be controlled by a variety of process parameters like reactor temperature, pre-
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