Ammonium Hydroxide (NH4OH, 10 mL, 28%, Merck) was added dropwise while stirring, yielding a white precipitate, which was centrifuged and then washed with DI water and isopropyl alcohol (IPA, Merck, 99.7%). 3 g of this precipitate was dispersed in 60 mL IPA and refluxed while stirring in a mineral oil bath at 90 o C for 18 hours until a brown/black dispersion was produced, which contained the SnO nanoflowers.