Journal
RSC ADVANCES
Volume 4, Issue 14, Pages 7196-7201Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ra47195k
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Funding
- National Natural Science Foundation of China (NNSFC) [51202203]
- China Postdoctoral Science Foundation [2012M520078, 2013T60861]
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Noble metallic foams with low density are desirable in high energy-density physical experiments. In this study, Au foams with ultralow density were successfully synthesized from a template-dealloying approach. Microspherical polystyrene (PS) was employed as the sacrificial template. Au and Ag nanoparticles were sequentially coated onto the PS surface from a three-step deposition process. Cylindrical PS/Au/Ag monoliths were formed by filter-casting of the nanoparticle coated PS suspension. The templates were removed and Au-Ag alloy foams were generated after calcination at 400 degrees C. Self-supported Au foams with bimodal porous structure were produced by dealloying of the less noble Ag component. Au foam with density as low as 0.36 g cm(-3) can be achieved, which demonstrates high surface area of 23.6 m(2) g(-1) and pore volume of 0.15 m(3) g(-1).
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