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Title: Self-assembled HfO2-Au nanocomposites with ultra-fine vertically aligned Au nanopillars

Abstract

Oxide-metal-based hybrid materials have gained great research interest in recent years owing to their potential for multifunctionality, property coupling, and tunability. Specifically, oxide-metal hybrid materials in a vertically aligned nanocomposite (VAN) form could produce pronounced anisotropic physical properties, e.g., hyperbolic optical properties. Herein, self-assembled HfO2-Au nanocomposites with ultra-fine vertically aligned Au nanopillars (as fine as 3 nm in diameter) embedded in a HfO2 matrix were fabricated using a one-step self-assembly process. The film crystallinity and pillar uniformity can be obviously improved by adding an ultra-thin TiN-Au buffer layer during the growth. Here, the HfO2-Au hybrid VAN films show an obvious plasmonic resonance at 480 nm, which is much lower than the typical plasmonic resonance wavelength of Au nanostructures, and is attributed to the well-aligned ultra-fine Au nanopillars. Coupled with the broad hyperbolic dispersion ranging from 1050 nm to 1800 nm in wavelength, and unique dielectric HfO2, this nanoscale hybrid plasmonic metamaterial presents strong potential for the design of future integrated optical and electronic switching devices.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [1];  [3];  [3];  [1];  [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Purdue Univ., West Lafayette, IN (United States)
  2. Purdue Univ., West Lafayette, IN (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)
OSTI Identifier:
1881774
Alternate Identifier(s):
OSTI ID: 1879898
Report Number(s):
LA-UR-22-28353
Journal ID: ISSN 2040-3364
Grant/Contract Number:  
89233218CNA000001; NA0003525; DMR-2016453; DMR-1565822
Resource Type:
Accepted Manuscript
Journal Name:
Nanoscale
Additional Journal Information:
Journal Volume: 14; Journal Issue: 33; Journal ID: ISSN 2040-3364
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Material Science

Citation Formats

Zhang, Yizhi, Zhang, Di, Liu, Juncheng, Lu, Ping, Deitz, Julia, Shen, Jianan, He, Zihao, Zhang, Xinghang, and Wang, Haiyan. Self-assembled HfO2-Au nanocomposites with ultra-fine vertically aligned Au nanopillars. United States: N. p., 2022. Web. doi:10.1039/d2nr03104c.
Zhang, Yizhi, Zhang, Di, Liu, Juncheng, Lu, Ping, Deitz, Julia, Shen, Jianan, He, Zihao, Zhang, Xinghang, & Wang, Haiyan. Self-assembled HfO2-Au nanocomposites with ultra-fine vertically aligned Au nanopillars. United States. https://doi.org/10.1039/d2nr03104c
Zhang, Yizhi, Zhang, Di, Liu, Juncheng, Lu, Ping, Deitz, Julia, Shen, Jianan, He, Zihao, Zhang, Xinghang, and Wang, Haiyan. Fri . "Self-assembled HfO2-Au nanocomposites with ultra-fine vertically aligned Au nanopillars". United States. https://doi.org/10.1039/d2nr03104c. https://www.osti.gov/servlets/purl/1881774.
@article{osti_1881774,
title = {Self-assembled HfO2-Au nanocomposites with ultra-fine vertically aligned Au nanopillars},
author = {Zhang, Yizhi and Zhang, Di and Liu, Juncheng and Lu, Ping and Deitz, Julia and Shen, Jianan and He, Zihao and Zhang, Xinghang and Wang, Haiyan},
abstractNote = {Oxide-metal-based hybrid materials have gained great research interest in recent years owing to their potential for multifunctionality, property coupling, and tunability. Specifically, oxide-metal hybrid materials in a vertically aligned nanocomposite (VAN) form could produce pronounced anisotropic physical properties, e.g., hyperbolic optical properties. Herein, self-assembled HfO2-Au nanocomposites with ultra-fine vertically aligned Au nanopillars (as fine as 3 nm in diameter) embedded in a HfO2 matrix were fabricated using a one-step self-assembly process. The film crystallinity and pillar uniformity can be obviously improved by adding an ultra-thin TiN-Au buffer layer during the growth. Here, the HfO2-Au hybrid VAN films show an obvious plasmonic resonance at 480 nm, which is much lower than the typical plasmonic resonance wavelength of Au nanostructures, and is attributed to the well-aligned ultra-fine Au nanopillars. Coupled with the broad hyperbolic dispersion ranging from 1050 nm to 1800 nm in wavelength, and unique dielectric HfO2, this nanoscale hybrid plasmonic metamaterial presents strong potential for the design of future integrated optical and electronic switching devices.},
doi = {10.1039/d2nr03104c},
journal = {Nanoscale},
number = 33,
volume = 14,
place = {United States},
year = {Fri Jul 22 00:00:00 EDT 2022},
month = {Fri Jul 22 00:00:00 EDT 2022}
}

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