Synthesis of Au sponges based on agarose template
- Authors
- Kwak, Soyul; Jang, Seohyeon; Park, Soomin; Kang, Jihyeon; Kim, Tae Yong; Nam, Inho
- Issue Date
- Apr-2021
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Agarose gel framework; Infiltration; Porous materials; Density functional theory (DFT); Electron energy loss spectroscopy (EELS)
- Citation
- SCRIPTA MATERIALIA, v.196
- Journal Title
- SCRIPTA MATERIALIA
- Volume
- 196
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/62517
- DOI
- 10.1016/j.scriptamat.2021.113769
- ISSN
- 1359-6462
1872-8456
- Abstract
- Metal-containing porous structures have been widely used in the fields of electrochemical and acid-base catalysis, bio-filtration, and heat-dissipation. Here, we propose a method for the fabrication of robust macroporous metallic sponges using agarose gel and HAuCl4 as soft-sacrificial templates and Au precursor, respectively. We demonstrate that the preparation of self-supporting macroporous Au sponges is practicable by heating the soft-agarose framework in the range of temperatures from 200 to 500 degrees C. Before the calcination of agarose framework, Au precursor was reduced using NaBH4. A series of data obtained from X-ray photoelectron spectroscopy and X-ray diffraction indicates that the Au sponges were well synthesized with high crystallinity. The structural properties of porous Au were methodically investigated using Rietveld refinement and density-functional-theory calculations. The use of agarose gel as a soft template for the fabrication of metallic sponges has various advantages over conventional methods, as this approach is environmentally benign, shape-controllable, inexpensive, and scalable for mass production. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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