Large-scale, Lithography-free Production of Transparent Nanostructured Surface for Dual-functional Electrochemical and SERS Sensing
| Autor: | Kinga Zor, Anil Haraksingh Thilsted, Michael Stenbæk Schmidt, Anja Boisen, Onur Durucan, Arto Heiskanen, Tomas Rindzevicius, Kaiyu Wu, Kuldeep Sanger |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Shadow mask
Materials science Surface Properties Analytical chemistry Metal Nanoparticles Bioengineering Dual-functional 02 engineering and technology Spectrum Analysis Raman 010402 general chemistry Electrochemistry 01 natural sciences symbols.namesake Wafer Reactive-ion etching Electrodes Instrumentation Lithography Acetaminophen Fluid Flow and Transfer Processes Lithography-free SERS Process Chemistry and Technology Electrochemical Electrochemical Techniques 021001 nanoscience & nanotechnology Evaporation (deposition) 0104 chemical sciences Paracetamol Electrode symbols Gold 0210 nano-technology Raman spectroscopy Oxidation-Reduction |
| Zdroj: | Sanger, K, Durucan, O, Wu, K, Thilsted, A H, Heiskanen, A R, Rindzevicius, T, Schmidt, M S, Zor, K & Boisen, A 2017, ' Large-scale, Lithography-free Production of Transparent Nanostructured Surface for Dual-functional Electrochemical and SERS Sensing ', ACS Sensors, vol. 2, no. 12, pp. 1869–1875 . https://doi.org/10.1021/acssensors.7b00783 |
| Popis: | In this work, we present a dual-functional sensor that can perform surface-enhanced Raman spectroscopy (SERS) based identification and electrochemical (EC) quantification of analytes in liquid samples. A lithography-free reactive ion etching process was utilized to obtain nanostructures of high aspect ratios distributed homogeneously on a 4-inch fused silica wafer. The sensor was made up of three-electrode array, obtained by subsequent e-beam evaporation of Au on nanostructures in selected areas through a shadow mask. The SERS performance was evaluated through surface-averaged enhancement factor (EF), which was ~6.2 x 105, and spatial uniformity of EF, which was ~13% in terms of relative standard deviation. Excellent electrochemical performance and reproducibility were revealed by recording cyclic voltammograms. On nanostructured electrodes, paracetamol (PAR) showed an improved quasi-reversible behavior with decrease in peak potential separation (∆Ep ~90mV) and higher peak currents (Ipa/Ipc ~1), comparing to planar electrodes (∆Ep ~560mV). The oxidation potential of PAR was also lowered by ~80 mV on nanostructured electrodes. To illustrate dual-functional sensing, quantitative evaluation of PAR ranging from 30 µM to 3 mM was realized through EC detection, and presence of PAR was verified by its SERS fingerprint. |
| Databáze: | OpenAIRE |
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