The pH-Controlled Particle Size Tuning of Nanocrystalline Ni in Polyol Synthesis Method Without Additional Cappant
We demonstrate here the pH-controlled particle size tuning of nanocrystalline nickel (n-Ni) using polyol method. The phenomenal influence of reaction kinetics (temperature, time, pH) in the manipulation of particle size and nanostructure of Ni nanoparticles from the reduction of nickel
acetate using ethylene glycol (EG) is established. As the pH value increases from 6.5 to 10.5, reaction time increases systematically from 6 to 48 h while reaction temperature and crystallite size decrease from 192 to 154 °C and 38 to 13 nm, respectively proving a profound impact on the
nucleation and growth kinetics. Transmission electron microscopy (TEM) data reveal that sample with pH = 11 has a particle size of ∼5 nm. Their formation as small particles has been attributed to the EG and formation of 1,4-dioxane, which function as partial cappant. These new findings
offer vital insight into how polyol method of synthesis can be utilized to generate Ni nanoparticles with well-defined nanostructures.
Keywords: NANOCRYSTALLINE NI; PARTICLE SIZE; PH CONTROL; POLYOL SYNTHESIS METHOD
Document Type: Research Article
Publication date: 01 January 2011
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