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Nanoscale Structural Switching of Plasmonic Nanograin Layers on Hydrogel Colloidal Monolayers for Highly Sensitive and Dynamic SERS in Water with Areal Signal Reproducibility

Title
Nanoscale Structural Switching of Plasmonic Nanograin Layers on Hydrogel Colloidal Monolayers for Highly Sensitive and Dynamic SERS in Water with Areal Signal Reproducibility
Authors
Song, Ji EunKim, HakseongLee, Sang WookCho, Eun Chul
Ewha Authors
이상욱
SCOPUS Author ID
이상욱scopus
Issue Date
2017
Journal Title
ANALYTICAL CHEMISTRY
ISSN
0003-2700JCR Link1520-6882JCR Link
Citation
vol. 89, no. 21, pp. 11259 - 11268
Publisher
AMER CHEMICAL SOC
Indexed
SCI; SCIE; SCOPUS WOS
Abstract
Developing substrates that enable both reproducible and highly sensitive Raman detection of trace amounts of molecules in aqueous systems remains a challenge, although these substrates are crucial in biomedicine and environmental sciences. To address this issue, we report spatially uniform plasmonic nanowrinkles formed by intimate contact between plasmonic nanograins on the surface of colloidal crystal monolayers. The Au or Ag nanograin layers coated on hydrogel colloidal crystal monolayers can reversibly wrinkle and unwrinkle according to changes in the water temperature. The reversible switches are directed by surface structural changes in the colloidal crystal monolayers, while the colloids repeat the hydration-dehydration process. The Au and Ag nanowrinkles are obtained upon hydration, thus enabling the highly reproducible detection of Raman probes in water at the nano- and picomolar levels, respectively, throughout the entire substrate area. Additionally, the reversible switching of the nanostructures in the plasmonic nanograin layers causes reversible dynamic changes in the corresponding Raman signals upon varying the water temperature.
DOI
10.1021/acs.analchem.7b01021
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
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