Fast attenuation of high-frequency acoustic waves in bicontinuous nanoporous gold
- Shanghai Jiao Tong Univ. (China); SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Johns Hopkins Univ., Baltimore, MD (United States)
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Univ. of Duisburg-Essen (Germany). Centre for Nanointegration Duisburg-Essen
- Tohoku Univ., Sendai (Japan). WPI-Advanced Institute for Materials Research
- Shanghai Jiao Tong Univ. (China)
- Tohoku Univ., Sendai (Japan). WPI-Advanced Institute for Materials Research; Kochi Univ. of Technology, Kami City, Kochi (Japan)
We studied the formation and attenuation of GHz elastic waves in free-standing nanoporous gold films by MeV ultrafast electron diffraction and finite element simulations. By tracing the evolution of the high frequency acoustic waves in time domain, we found that the bicontinuous nanoporous structure in nanoporous gold films results in three-dimensionally acoustic response with low coherence, leading to fast attenuation of the elastic waves in comparison with solid gold films. The morphologically dominated dynamics indicates the nanoporosity plays an important role in the high-frequency acoustic energy relaxation, which shines a light on the applications of dealloyed nanoporous materials in nanodevices and sensors as GHz and THz acoustic filters and dampers.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); National Science Foundation (NSF); Japan Science and Technology Agency; DFG, German Research Foundation
- Grant/Contract Number:
- AC02-76SF00515; DMR-1804320; 278162697
- OSTI ID:
- 1819276
- Journal Information:
- Applied Physics Letters, Vol. 119, Issue 6; ISSN 0003-6951
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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