Example 13
KWO is grown using the hydrothermal method. [19, 20] A precursor solution containing Na2WO4.2H2O (95%, Alfa Aesar), oxalic acid dihydrate (>99%, VWR), K2SO4 (>99%, VWR), and HCl (36-38%, Aqua Solutions Inc.) was made. This solution was then put into a 30 mL autoclave for synthesis. KWO samples were grown at 160, 180, 210, and 225° C. for 24 hours. Samples used for acetone sensing tests were applied to a sensor slide by blade coating and then annealed at 350° C.