TY - JOUR
T1 - Reusable Au/Pd-coated chestnut-like copper oxide SERS substrates with ultra-fast self-recovery
AU - Shvalya, Vasyl
AU - Filipič, Gregor
AU - Vengust, Damjan
AU - Zavašnik, Janez
AU - Modic, Martina
AU - Abdulhalim, Ibrahim
AU - Cvelbar, Uroš
N1 - Funding Information:
This work was supported by Slovenian-Israeli Ministries of Science binational collaboration project ARRS grant NI-0001 , and grant N2-0091 . We acknowledge the CENN Nanocenter for the use of Confocal Raman NTegra Spectra I. The authors from JSI appreciate the support from “Corner Society”, where most of the bright research ideas were generated during collaborative evening meetings. GF acknowledges the financial support of the Slovenian Research Agency (ARRS) on a project Z2-8164 .
Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2020/7/1
Y1 - 2020/7/1
N2 - Reliable and reusable plasmonic substrates are crucial for the development of biosensing applications using surface-enhanced Raman scattering (SERS), as they can provide unique advantages for ultrafast and accurate single-molecule recognition of different species. These properties are unrevealed in this paper, where thermally annealed cupric CuO and cuprous oxide Cu2O heterostructures were used as templates for highly stable nanotextured surfaces and design of robust 3D plasmonic biochips. Differently tailored nano/micro-roughness provided outstanding light trapping abilities that lead to significant SERS performance improvement. It was found that Cu2O chestnut-like substrate activated with 80 nm Au/Pd alloy film reveals impressive 3.7-fold Raman signal increment in respect to grainy-like structure and about twice larger amplification than that of nanowires enriched platform decorated in the same manner. Large enhancement factor AEF ~5 × 105 of a chestnut-like Au/Pd@/Cu2O chip allows adding it up to the list of the most effective oxide-based plasmonic substrates. Moreover, the substrate shows unprecedented durability during repetitive plasma-cleaning, demonstrating a remarkable 100% self-recovery in less than 1 min, accompanied by virtually no thickness degradation of the plasmonic layer.
AB - Reliable and reusable plasmonic substrates are crucial for the development of biosensing applications using surface-enhanced Raman scattering (SERS), as they can provide unique advantages for ultrafast and accurate single-molecule recognition of different species. These properties are unrevealed in this paper, where thermally annealed cupric CuO and cuprous oxide Cu2O heterostructures were used as templates for highly stable nanotextured surfaces and design of robust 3D plasmonic biochips. Differently tailored nano/micro-roughness provided outstanding light trapping abilities that lead to significant SERS performance improvement. It was found that Cu2O chestnut-like substrate activated with 80 nm Au/Pd alloy film reveals impressive 3.7-fold Raman signal increment in respect to grainy-like structure and about twice larger amplification than that of nanowires enriched platform decorated in the same manner. Large enhancement factor AEF ~5 × 105 of a chestnut-like Au/Pd@/Cu2O chip allows adding it up to the list of the most effective oxide-based plasmonic substrates. Moreover, the substrate shows unprecedented durability during repetitive plasma-cleaning, demonstrating a remarkable 100% self-recovery in less than 1 min, accompanied by virtually no thickness degradation of the plasmonic layer.
KW - Bimetallic plasmonic activation
KW - Low reflectance copper oxide heterostructures
KW - Reactive plasma cleaning
KW - SERS
UR - http://www.scopus.com/inward/record.url?scp=85082675606&partnerID=8YFLogxK
U2 - 10.1016/j.apsusc.2020.146205
DO - 10.1016/j.apsusc.2020.146205
M3 - Article
AN - SCOPUS:85082675606
VL - 517
JO - Applied Surface Science
JF - Applied Surface Science
SN - 0169-4332
M1 - 146205
ER -