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Title: Fabrication of Large-Area Arrays of Vertically Aligned Gold Nanorods

Abstract

Anisotropic nanoparticles, such as nanorods and nanoprisms, enable packing of complex nanoparticle structures with different symmetry and assembly orientation, which result in unique functions. Despite previous extensive efforts, formation of large areas of oriented or aligned nanoparticle structures still remains a great challenge. In this paper, we report fabrication of large-area arrays of vertically aligned gold nanorods (GNR) through a controlled evaporation deposition process. We began with a homogeneous suspension of GNR and surfactants prepared in water. During drop casting on silicon substrates, evaporation of water progressively enriched the concentrations of the GNR suspension, which induces the balance between electrostatic interactions and entropically driven depletion attraction in the evaporating solution to produce large-area arrays of self-assembled GNR on the substrates. Electron microscopy characterizations revealed the formation of layers of vertically aligned GNR arrays that consisted of hexagonally close-packed GNR in each layer. Benefiting from the close-packed GNR arrays and their smooth topography, the GNR arrays exhibited a surface-enhanced Raman scattering (SERS) signal for molecular detection at a concentration as low as 10 –15 M. Because of the uniformity in large area, the GNR arrays exhibited exceptional detecting reproducibility and operability. Finally, this method is scalable and cost-effective and could leadmore » to diverse packing structures and functions by variation of guest nanoparticles in the suspensions.« less

Authors:
 [1];  [1];  [1];  [1];  [1];  [1]; ORCiD logo [2]
  1. Henan Univ., Kaifeng (China). Key Lab. for Special Functional Materials of the Ministry of Education. Collaborative Innovation Center of Nano Functional Materials and Applications
  2. Univ. of New Mexico, Albuquerque, NM (United States). Dept. of Chemical and Biological Engineering; Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Center for Integrated Nanotechnologies
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Henan Univ., Kaifeng (China)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE National Nuclear Security Administration (NNSA); National Natural Science Foundation of China (NNSFC); Plan for Scientific Innovation Talent of Henan Province (China); Program for Changjiang Scholars and Innovative Research Team in University (China)
OSTI Identifier:
1469626
Report Number(s):
[SAND-2018-9736J]
[Journal ID: ISSN 1530-6984; 667621]
Grant/Contract Number:  
[NA0003525; 21422102; 21403054; 21771055; U1604139; 174200510019; PCS IRT_15R18]
Resource Type:
Accepted Manuscript
Journal Name:
Nano Letters
Additional Journal Information:
[ Journal Volume: 18; Journal Issue: 7]; Journal ID: ISSN 1530-6984
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; depletion attraction; directional self-assembly; gold nanorods; morphology; SERS; vertical alignment

Citation Formats

Wei, Wenbo, Wang, Yuru, Ji, Juanjuan, Zuo, Shanshan, Li, Wentao, Bai, Feng, and Fan, Hongyou. Fabrication of Large-Area Arrays of Vertically Aligned Gold Nanorods. United States: N. p., 2018. Web. doi:10.1021/acs.nanolett.8b01584.
Wei, Wenbo, Wang, Yuru, Ji, Juanjuan, Zuo, Shanshan, Li, Wentao, Bai, Feng, & Fan, Hongyou. Fabrication of Large-Area Arrays of Vertically Aligned Gold Nanorods. United States. doi:10.1021/acs.nanolett.8b01584.
Wei, Wenbo, Wang, Yuru, Ji, Juanjuan, Zuo, Shanshan, Li, Wentao, Bai, Feng, and Fan, Hongyou. Mon . "Fabrication of Large-Area Arrays of Vertically Aligned Gold Nanorods". United States. doi:10.1021/acs.nanolett.8b01584. https://www.osti.gov/servlets/purl/1469626.
@article{osti_1469626,
title = {Fabrication of Large-Area Arrays of Vertically Aligned Gold Nanorods},
author = {Wei, Wenbo and Wang, Yuru and Ji, Juanjuan and Zuo, Shanshan and Li, Wentao and Bai, Feng and Fan, Hongyou},
abstractNote = {Anisotropic nanoparticles, such as nanorods and nanoprisms, enable packing of complex nanoparticle structures with different symmetry and assembly orientation, which result in unique functions. Despite previous extensive efforts, formation of large areas of oriented or aligned nanoparticle structures still remains a great challenge. In this paper, we report fabrication of large-area arrays of vertically aligned gold nanorods (GNR) through a controlled evaporation deposition process. We began with a homogeneous suspension of GNR and surfactants prepared in water. During drop casting on silicon substrates, evaporation of water progressively enriched the concentrations of the GNR suspension, which induces the balance between electrostatic interactions and entropically driven depletion attraction in the evaporating solution to produce large-area arrays of self-assembled GNR on the substrates. Electron microscopy characterizations revealed the formation of layers of vertically aligned GNR arrays that consisted of hexagonally close-packed GNR in each layer. Benefiting from the close-packed GNR arrays and their smooth topography, the GNR arrays exhibited a surface-enhanced Raman scattering (SERS) signal for molecular detection at a concentration as low as 10–15 M. Because of the uniformity in large area, the GNR arrays exhibited exceptional detecting reproducibility and operability. Finally, this method is scalable and cost-effective and could lead to diverse packing structures and functions by variation of guest nanoparticles in the suspensions.},
doi = {10.1021/acs.nanolett.8b01584},
journal = {Nano Letters},
number = [7],
volume = [18],
place = {United States},
year = {2018},
month = {6}
}

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Cited by: 8 works
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Figures / Tables:

Figure 1 Figure 1: Representative images of vertically aligned GNR arrays self-assembled on silicon substrates under controlled evaporation. (A) A circular area of the self-assembled GNR arrays with ~ 2 mm diameter. (B) Magnified area of the self-assembled array, blue frame in (A). (C) Magnified side area of the self-assembled array, redmore » frame in (A). (D) A shattered domain of the self-assembled array formed by uniformly aligned GNR. (E) A top view high resolution SEM image of the self-assembled GNR. Inset shows a cross-sectional image of the GNR array. (F) An AFM image of the self-assembled GNR arrays. (G) XRD spectra of the GNR array (red). The blue bars show the XRD peak positions and relative intensities of bulk gold. The yellow-colored rods show the relative alignment compared with bulk gold.« less

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Works referencing / citing this record:

Oriented Gold Nanorod Arrays: Self-Assembly and Optoelectronic Applications
journal, June 2019

  • Wei, Wenbo; Bai, Feng; Fan, Hongyou
  • Angewandte Chemie International Edition, Vol. 58, Issue 35
  • DOI: 10.1002/anie.201902620

Magnetic Assembly Route to Construct Reproducible and Recyclable SERS Substrate
journal, December 2019


    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.