Fast and non-destructive Raman spectroscopic determination of multi-walled carbon nanotube (MWCNT) contents in MWCNT/polydimethylsiloxane composites
| Autor: | Tae Hyun Yoon, Pham Khac Duy, Sang-Hoon Cho, Jong Yun Kim, Hoeil Chung, Donghyun Ryoo |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
02 engineering and technology Carbon nanotube 010402 general chemistry 01 natural sciences Biochemistry Microscopic scale Analytical Chemistry law.invention chemistry.chemical_compound symbols.namesake law Electrochemistry Environmental Chemistry Composite material Absorption (electromagnetic radiation) Penetration depth Spectroscopy chemistry.chemical_classification Polydimethylsiloxane Polymer 021001 nanoscience & nanotechnology Laser 0104 chemical sciences chemistry symbols 0210 nano-technology Raman spectroscopy |
| Zdroj: | The Analyst |
| ISSN: | 0003-2654 |
| DOI: | 10.1039/C8AN00351C |
| Popis: | A versatile Raman spectroscopic method to determine the contents of carbon nanotubes (CNTs) in CNT/polydimethylsiloxane (PDMS) composites is demonstrated, and important issues directly related to the accuracy of the measurement have been investigated. Initially, Raman microscopic mappings over an area of 6.0 × 6.0 mm2 were carried out on CNT/PDMS composites, which revealed the existence of the partial localization of CNTs on a microscopic scale. Therefore, a laser illumination scheme covering a large sample area of 28.3 mm2 was employed to acquire a sample spectrum representative of the whole CNT concentration. The peak area ratio between the CNT and PDMS peaks clearly varied with the CNT concentration, whereas the reproducibility of measurements was degraded for the composites containing more than 3.0 wt% CNTs because of the decreased Raman sampling volume arising from the absorption of laser radiation by the CNTs. The laser penetration depth was semi-quantitatively investigated by observing the spectra of thin-sliced samples collected by positioning a Teflon disk behind the sample, and Monte Carlo simulations were employed to examine the internal photon propagation as well as explain the experimental observation. In summary, the fundamental issues affecting the Raman measurement of the CNT containing polymer matrix have been clearly addressed, and the finding here will be a beneficial basis for successful Raman spectroscopic analysis of different CNT-containing composites. |
| Databáze: | OpenAIRE |
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