I have prepared various metal nanoparticles but I observed that Nickel nanoparticles's black colour solution becomes transparent after few hours,while others nanoparticles such as Cr, Co,Ag solutions don't . What happened with Nickel nanoparticles the solution? Why colour disappears? Even all above discussed nanoparticles are capped by various capping agents in the solutions.Kindly share your valuable knowledge,thanks in advance.
it sounds like a (possibly) related effect found for an electrochromic Ni-O (in ref1, see Fig.6).
ref1: Electrochromic properties of porous NiO thin films prepared by a chemical bath deposition [http://www.sciencedirect.com/science/article/pii/S0927024808000202]
Thanks you so much dear loannis samaras for your answer, I will read the given link, dear loannis sir , if I have any confusion,can i ask you again???
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