Flexible plasmonic graphene oxide/heterostructures for dual-channel detection
| Autor: | Bing Ma, Anna Lipovka, Elena V. Dorozhko, Surinder Kumar Mehta, Dietrich R. T. Zahn, Raul D. Rodriguez, Oleksandr Selyshchev, Ammar Al-Hamry, Olfa Kanoun, Varnika Prakash, Volodymyr Dzhagan, Shweta Sharma, Ashutosh Mukherjee, Evgeniya Sheremet |
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| Rok vydání: | 2019 |
| Předmět: |
Nanostructure
Materials science Oxide Nanotechnology 02 engineering and technology 01 natural sciences Biochemistry Analytical Chemistry law.invention symbols.namesake chemistry.chemical_compound X-ray photoelectron spectroscopy law Electrochemistry Environmental Chemistry Spectroscopy Plasmon Graphene 010401 analytical chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences Kapton chemistry Electrode symbols 0210 nano-technology Raman spectroscopy |
| Zdroj: | The Analyst. 144:3297-3306 |
| ISSN: | 1364-5528 0003-2654 |
| DOI: | 10.1039/c8an02495b |
| Popis: | Graphene oxide (GO) films are deposited on flexible Kapton substrates and selectively modified to conductive reduced graphene oxide (rGO) electrodes using laser patterning. Based on this, we design, fabricate, and test a flexible sensor integrating laser-reduced GO with silver plasmonic nanostructures. The fabricated device results in dual transduction channels: for electrochemical and plasmonic nanostructure-based surface-enhanced Raman spectroscopy (SERS) detection. The spectroscopic analysis verifying the formation of rGO and the modification by silver nanostructures is performed by Raman, energy dispersive X-ray (EDX), and X-ray photoelectron spectroscopy (XPS). The morphological investigation is followed by optical and scanning electron microscopy imaging. In addition to pristine silver nanostructures, the Raman spectroscopy results show the formation of species such as Ag2O, Ag2CO3, and Ag2SOx. A dual-channel sensor device based on electrochemical and plasmonic detection is fabricated as a demonstration of our Ag-rGO flexible concept architecture. The dual-channel device performance is successfully demonstrated in the electrochemical and SERS detection of 4-nitrobenzenethiol (4-NBT) using the same device. Our results show that without Ag nanostructures the sensitivity in the electrochemical and optical channels is not sufficient to detect 4-NBT. The performance and stability of the silver modified device are also verified. This work demonstrates an inexpensive, highly efficient, and greener way that is compatible with solution-processing technology for the production of flexible GO-based electrochemical and SERS detection devices integrated with plasmonic nanostructures. |
| Databáze: | OpenAIRE |
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