Graphene oxide-Ag nanoparticles-pyramidal silicon hybrid system for homogeneous, long-term stable and sensitive SERS activity
| Autor: | Zhe Li, Tingyin Ning, Xiaoyun Liu, Yong Ma, Shouzhen Jiang, Shicai Xu, Litao Hu, Jia Guo, Peixi Chen, Zhen Li |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Silicon Calibration curve Oxide General Physics and Astronomy chemistry.chemical_element Nanotechnology 02 engineering and technology 010402 general chemistry 01 natural sciences law.invention Rhodamine 6G symbols.namesake chemistry.chemical_compound law business.industry Graphene Surfaces and Interfaces General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Surfaces Coatings and Films chemistry symbols Optoelectronics 0210 nano-technology business Raman spectroscopy Raman scattering Order of magnitude |
| Zdroj: | Applied Surface Science. 396:1130-1137 |
| ISSN: | 0169-4332 |
| DOI: | 10.1016/j.apsusc.2016.11.098 |
| Popis: | In our work, few layers graphene oxide (GO) were directly synthesized on Ag nanoparticles (AgNPs) by spin-coating method to fabricate a GO-AgNPs hybrid structure on a pyramidal silicon (PSi) substrate for surface-enhanced Raman scattering (SERS). The GO-AgNPs-PSi substrate showed excellent Raman enhancement effect, the minimum detected concentration for Rhodamine 6G (R6G) can reach 10 −12 M, which is one order of magnitude lower than the AgNPs-PSi substrate and two order of magnitude lower than the GO-AgNPs-flat-Si substrate. The linear fit calibration curve with error bars is presented and the value of R 2 of 612 and 773 cm −1 can reach 0.986 and 0.980, respectively. The excellent linear response between the Raman intensity and R6G concentrations prove that the prepared GO-AgNPs-PSi substrates can serve as good SERS substrate for molecule detection. The maximum deviations of SERS intensities from 20 positions of the GO-AgNPs-PSi substrate are less than 8%, revealing the high homogeneity of the SERS substrate. The excellent homogeneity of the enhanced Raman signals can be attributed to well-separated pyramid arrays of PSi, the uniform morphology of AgNPs and multi-functions of GO layer. Besides, the uniform GO film can effectively protect AgNPs from oxidation and endow the hybrid system a good stability and long lifetime. This GO-AgNPs-PSi substrate may provide a new way toward practical applications for the ultrasensitive and label-free SERS detection in areas of medicine, food safety and biotechnology. |
| Databáze: | OpenAIRE |
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