20 June 2016 6 9K Report

I am doing my research on metal nanoparticles by using laser ablation in de-ionized water.The day i prepared my sample i did Uv-vis Characterization to determine the band gap.I placed the sample intact and than did the same characterization after 10 days and observed a decrease in band gap.The color of the sample also changes from grey to milky white.What might be the reason behind decrease in band gap?

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