Hierarchical Nanoflowers on Nanograss Structure for a Non-wettable Surface and a SERS Substrate

Jun Young Lee, Jaehyun Han, Jihye Lee, Seungmuk Ji, Jong-Souk Yeo

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Hierarchical nanostructures of CuO nanoflowers on nanograss were investigated for self-cleaning and surface plasmonic applications. We achieved the hierarchical nanostructures using one-step oxidation process by controlling the formation of flower-like nanoscale residues (nanoflowers) on CuO nanograss. While the nanograss structure of CuO has a sufficient roughness for superhydrophobic characteristics, the additional hierarchy of nanoflowers on nanograss leads to a semi-reentrant structure with a high repellency even for a very small droplet (10 nL) of low surface tension liquid such as 25 % ethanol (~35 mN/m), thus providing non-wettable and self-cleaning properties. Furthermore, the CuO hierarchical nanostructure serves as a substrate for surface-enhanced Raman spectroscopy (SERS). Both of the CuO nanograss and nanoflower provide many nanoscale gaps that act as hot-spots for surface-enhanced Raman signal of 4-mercaptopyridine (4-Mpy), thus enabling a non-destructive detection in a short analysis time with relatively simple preparation of sample. Especially, the CuO nanoflower has larger number of hot-spots at the nanogaps from floral leaf-like structures, thus leading to three times higher Raman intensity than the CuO nanograss. These multifunctional results potentially provide a path toward cost-effective fabrication of a non-wettable surface for self-maintenance applications and a SERS substrate for sensing applications.

Original languageEnglish
Article number505
Pages (from-to)1-9
Number of pages9
JournalNanoscale Research Letters
Volume10
Issue number1
DOIs
Publication statusPublished - 2015 Dec 1

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Nanoflowers
Raman spectroscopy
Substrates
Nanostructures
cleaning
Cleaning
leaves
maintenance
hierarchies
Surface tension
interfacial tension
Ethanol
ethyl alcohol
roughness
Surface roughness
costs
Fabrication
Oxidation
preparation
oxidation

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Lee, Jun Young ; Han, Jaehyun ; Lee, Jihye ; Ji, Seungmuk ; Yeo, Jong-Souk. / Hierarchical Nanoflowers on Nanograss Structure for a Non-wettable Surface and a SERS Substrate. In: Nanoscale Research Letters. 2015 ; Vol. 10, No. 1. pp. 1-9.
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abstract = "Hierarchical nanostructures of CuO nanoflowers on nanograss were investigated for self-cleaning and surface plasmonic applications. We achieved the hierarchical nanostructures using one-step oxidation process by controlling the formation of flower-like nanoscale residues (nanoflowers) on CuO nanograss. While the nanograss structure of CuO has a sufficient roughness for superhydrophobic characteristics, the additional hierarchy of nanoflowers on nanograss leads to a semi-reentrant structure with a high repellency even for a very small droplet (10 nL) of low surface tension liquid such as 25 {\%} ethanol (~35 mN/m), thus providing non-wettable and self-cleaning properties. Furthermore, the CuO hierarchical nanostructure serves as a substrate for surface-enhanced Raman spectroscopy (SERS). Both of the CuO nanograss and nanoflower provide many nanoscale gaps that act as hot-spots for surface-enhanced Raman signal of 4-mercaptopyridine (4-Mpy), thus enabling a non-destructive detection in a short analysis time with relatively simple preparation of sample. Especially, the CuO nanoflower has larger number of hot-spots at the nanogaps from floral leaf-like structures, thus leading to three times higher Raman intensity than the CuO nanograss. These multifunctional results potentially provide a path toward cost-effective fabrication of a non-wettable surface for self-maintenance applications and a SERS substrate for sensing applications.",
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Hierarchical Nanoflowers on Nanograss Structure for a Non-wettable Surface and a SERS Substrate. / Lee, Jun Young; Han, Jaehyun; Lee, Jihye; Ji, Seungmuk; Yeo, Jong-Souk.

In: Nanoscale Research Letters, Vol. 10, No. 1, 505, 01.12.2015, p. 1-9.

Research output: Contribution to journalArticle

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