Three-dimensional porous SERS powder for sensitive liquid and gas detections fabricated by engineering dense 'hot spots' on silica aerogel
| Autor: | Longkun Yang, Zhipeng Li, Li Pan, Song Yanli, Pingye Deng, Qiu Yun, Meng Zhang, Zhifang Ren |
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| Rok vydání: | 2020 |
| Předmět: |
Analyte
In situ chemical reduction Materials science Nanostructure Calibration curve General Engineering Bioengineering Aerogel Nanotechnology Near and far field 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Atomic and Molecular Physics and Optics 0104 chemical sciences Specific surface area General Materials Science 0210 nano-technology Porosity |
| Zdroj: | Nanoscale advances. 3(4) |
| ISSN: | 2516-0230 |
| Popis: | A three-dimensional porous SERS powder material, Ag nanoparticles-engineered-silica aerogel, was developed. Utilizing an in situ chemical reduction strategy, Ag nanoparticles were densely assembled on porous aerogel structures, thus forming three-dimensional “hot spots” distribution with intrinsic large specific surface area and high porosity. These features can effectively enrich the analytes on the metal surface and provide huge near field enhancement. Highly sensitive and homogeneous SERS detections were achieved not only on the conventional liquid analytes but also on gas with the enhancement factor up to ∼108 and relative standard deviation as small as ∼13%. Robust calibration curves were obtained from the SERS data, which demonstrates the potential for the quantification analysis. Moreover, the powder shows extraordinary SERS stability than the conventional Ag nanostructures, which makes long term storage and convenient usage feasible. With all of these advantages, the porous SERS powder material can be extended to on-site SERS “nose” applications such as liquid and gas detections for chemical analysis, environmental monitoring, and anti-terrorism. |
| Databáze: | OpenAIRE |
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