Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 5, Issue 24, Pages 13129-13134Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am4041543
Keywords
ultra-low-density foam; aerogels; atomic layer deposition; core-shell composite material; titanium dioxide; zinc oxide; lasers; X-ray source
Funding
- U.S. Department of Energy by LLNL [DE-AC52-07NA27344]
- LDRD Program at LLNL [13-LWD-031]
- NSF
- DOE [NSF/CHE-0822838]
- DOE BES [DE-AC02-06CH11357]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [0822838] Funding Source: National Science Foundation
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A universal approach for on-demand development of monolithic metal oxide composite bulk materials with air-like densities (<5 mg/cm(3)) is reported. The materials are fabricated by atomic layer deposition of titania (TiO2) or zinc oxide (ZnO) using the nanoscale architecture of 1 mg/cm(3) SiO2 aerogels formed by self-organization as a blueprint. This approach provides deterministic control over density and composition without affecting the nanoscale architecture of the composite material that is otherwise very difficult to achieve. We found that these materials provide laser-to-X-ray conversion efficiencies of up to 5.3%, which is the highest conversion efficiency yet obtained from any foam-based target, thus opening the door to a new generation of highly efficient laser-induced nanosecond scale multi-keV X-ray sources.
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