Synthesis and applications of silver and palladium nano metal foams
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Nanoporous metal foams (NMFs), a relatively new class of materials with low-density, high surface area and conductivity, have been studied recently in nano science. These materials can be engineered to benefit many fields and promise to enable new technologies in areas such as hydrogen storage, high power density battery, surface-enhanced Raman spectroscopy and supercapacitors. Herein a new developed method is presented to synthesis low-density, nanoporous metal foams of silver and palladium. This study mainly focuses on the synthesis process of NMFs of and it also provides some new applications that are useful in research and daily life. Silver NMFs were produced by mixing silver nitrate mixed with ethylene glycol, ethanol, and a reducing agent, and heating at 150 W for 5min using a CEM microwave. Higher conversions for this process were obtained using either hydrazine or sodium borohydride as the acceptable reducing agent for this redox reaction. Palladium NMFs were synthesized in the same way in the condition of 150 °C with either hydrazine or sodium borohydride as the reducing agent. Silver NMFs were applied in surface-enhanced Raman spectroscopy (SERS) as a substrate material. This material can enhance the detection of the rhodamine 6G (R6G), a model analyte. The limit of detection for rhodamine 6G was found to be 2 ₉ 10-6 M with the help of this silver nanoporous structure. Palladium NMFs was found to degrade methyl orange (MO). An aqueous MO solution will turn nearly colorless after only 10 h of mixing with 0.03g of palladium NMFs at room temperature under dark condition. Different concentrations of MO solution were also studied to compare the reaction rates. This application is applicable to the treatment of liquid waste and water purification and is thus conductive to improving the environment.