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Title: Optical properties of nanoporous gold foams

Abstract

We fabricated and experimentally studied Au nano-foams and Al2O3 scaffolds filled with Au nanoparticles (NPs). We found that while the reflectance spectra of Au nano-foams depended very little on the 8-10 nm Al2O3 ALD coating, the spectra were highly sensitive to annealing, which increased the sizes of voids and ligaments from 50-100 nm to ~300 nm. The effective dielectric permittivities of the Au nano-foams and Al2O3 scaffolds with Au NPs were extremely high, ~50. At the same time, Au nano-foams covered with a dielectric (MgF2) featured bright structural colors, calling for the model, which extends beyond the effective medium approximation.

Authors:
 [1]; ORCiD logo [2];  [2];  [3]; ORCiD logo [1]
+ Show Author Affiliations
  1. Norfolk State Univ., VA (United States). Center for Material Research
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Nanoscale Synthesis and Characterization Lab.
  3. MIT Lincoln Lab., Lexington, MA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Norfolk State Univ., VA (United States); MIT Lincoln Lab., Lexington, MA (United States)
Sponsoring Org.:
USDOE; National Science Foundation (NSF); US Air Force Office of Scientific Research (AFOSR); US Army Research Office (ARO)
OSTI Identifier:
1523570
Alternate Identifier(s):
OSTI ID: 1468505
Report Number(s):
LLNL-JRNL-746772
Journal ID: ISSN 2158-3226; 931587
Grant/Contract Number:  
AC52-07NA27344; 1205457; 1646789; FA9550-14-1-0221; FA8721-05-C-0002; FA8702-15-D-0001; W911NF-14-1-0639
Resource Type:
Accepted Manuscript
Journal Name:
AIP Advances
Additional Journal Information:
Journal Volume: 8; Journal Issue: 9; Journal ID: ISSN 2158-3226
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; nanomaterials; reflectometry; metal oxides; transition metals; nanoparticles; thin films; dielectric properties; optical properties; effective medium approximation

Citation Formats

Asane, J. K., Qi, Z., Biener, M. M., Liberman, V., and Noginov, M. A. Optical properties of nanoporous gold foams. United States: N. p., 2018. Web. doi:10.1063/1.5030128.
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Asane, J. K., Qi, Z., Biener, M. M., Liberman, V., & Noginov, M. A. Optical properties of nanoporous gold foams. United States. https://doi.org/10.1063/1.5030128
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Asane, J. K., Qi, Z., Biener, M. M., Liberman, V., and Noginov, M. A. Tue . "Optical properties of nanoporous gold foams". United States. https://doi.org/10.1063/1.5030128. https://www.osti.gov/servlets/purl/1523570.
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@article{osti_1523570,
title = {Optical properties of nanoporous gold foams},
author = {Asane, J. K. and Qi, Z. and Biener, M. M. and Liberman, V. and Noginov, M. A.},
abstractNote = {We fabricated and experimentally studied Au nano-foams and Al2O3 scaffolds filled with Au nanoparticles (NPs). We found that while the reflectance spectra of Au nano-foams depended very little on the 8-10 nm Al2O3 ALD coating, the spectra were highly sensitive to annealing, which increased the sizes of voids and ligaments from 50-100 nm to ~300 nm. The effective dielectric permittivities of the Au nano-foams and Al2O3 scaffolds with Au NPs were extremely high, ~50. At the same time, Au nano-foams covered with a dielectric (MgF2) featured bright structural colors, calling for the model, which extends beyond the effective medium approximation.},
doi = {10.1063/1.5030128},
journal = {AIP Advances},
number = 9,
volume = 8,
place = {United States},
year = {Tue Sep 04 00:00:00 EDT 2018},
month = {Tue Sep 04 00:00:00 EDT 2018}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1063/1.5030128
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Citation Metrics:
Cited by: 4 works
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Figures / Tables:

Fig. 1 Fig. 1: (a) Scanning Electron Microscope (SEM) image of “as is” Au nano-foam sample. (b) SEM image of the Al2O3 scaffold filled with Au nanoparticles.
All figures and tables (5 total)
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    Figures / Tables found in this record:

    Fig. 1 (p. 4)figure
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    Fig. 3 (p. 5)figure
    Fig. 4 (p. 6)figure
    Fig. 5 (p. 6)figure
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