TY - JOUR
T1 - Nanoscale structural switching of plasmonic nanograin layers on hydrogel colloidal monolayers for highly sensitive and dynamic SERS in water with areal signal reproducibility
AU - Song, Ji Eun
AU - Kim, Hakseong
AU - Lee, Sang Wook
AU - Cho, Eun Chul
N1 - Funding Information:
J.E.S and E.C.C. acknowledges the financial support from NRF grants (2012R1A1A1004697, NRF-2015R1A2A2A01007003, and 2015M3C8A6A06014792) funded by the Ministry of Science, ICT & Future Planning (Korea). H.K. and S.W.L. acknowledges the financial support from the Basic Science Research Program (2015R1A2A2A05050829) and International Collaboration Program (NRF-2016K2A9A1A03905001). We acknowledge Younan Xia at Georgia Institute of Technology for helpful discussion of the experimental data, Eleanor Campbell at University of Edinburgh for helpful comments and reviews of the manuscript, and Tae Hee Han at Hanyang University for technical supports.
Publisher Copyright:
© 2017 American Chemical Society.
PY - 2017/11/7
Y1 - 2017/11/7
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85041318393&partnerID=8YFLogxK
U2 - 10.1021/acs.analchem.7b01021
DO - 10.1021/acs.analchem.7b01021
M3 - Article
C2 - 28953360
AN - SCOPUS:85041318393
SN - 0003-2700
VL - 89
SP - 11259
EP - 11268
JO - Analytical Chemistry
JF - Analytical Chemistry
IS - 21
ER -