We explored the potential of a carbon nanotube (CNT) coating working in conjunction with a recently developed localized surface plasmon (LSP) device (based upon a nanostructured thin film consisting of of nano-wires of platinum) with ultra-high sensitivity to changes in the surrounding index. The uncoated LSP sensor’s transmission resonances exhibited a refractive index sensitivity of Δλ/Δn ~ -6200nm/RIU and ΔΙ/Δn ~5900dB/RIU, which is the highest reported spectral sensitivity of a fiber optic sensor to bulk index changes within the gas regime. The complete device provides the first demonstration of the chemically specific gas sensing capabilities of CNTs utilizing their optical characteristics. This is proven by investigating the spectral response of the sensor before and after the adhesion of CNTs to alkane gases along with carbon dioxide. The device shows a distinctive spectral response in the presence of gaseous CO2 over and above what is expected from general changes in the bulk refractive index. This fiber device yielded a limit of detection of 150ppm for CO2 at a pressure of one atmosphere. Additionally the adhered CNTs actually reduce sensitivity of the device to changes in bulk refractive index of the surrounding medium. The polarization properties of the LSP sensor resonances are also investigated and it is shown that there is a reduction in the overall azimuthal polarization after the CNTs are applied. These optical devices offer a way of exploiting optically the chemical selectivity of carbon nanotubes, thus providing the potential for real-world applications in gas sensing in many inflammable and explosive environments.
|Title of host publication||Optical Sensing, Imaging, and Photon Counting: Nanostructured Devices and Applications|
|Editors||Manijeh Razeghi, Dorota S. Temple, Gail J. Brown|
|Place of Publication||Bellingham, WA (US)|
|Number of pages||7|
|Publication status||Published - 9 Aug 2015|
|Event||Optical Sensing, Imaging, and Photon Counting - San Diego, United States|
Duration: 11 Aug 2015 → 13 Aug 2015
|Conference||Optical Sensing, Imaging, and Photon Counting|
|Period||11/08/15 → 13/08/15|
Bibliographical noteT. Allsop ; R. Arif ; R. Neal ; K. Kalli ; V. Kundrát ; A. Rozhin ; P. Culverhouse and D. J. Webb, "Localised surface plasmon fiber device coated with carbon nanotubes for the specific detection of CO(2)", Proc. SPIE 9555, Optical Sensing, Imaging, and Photon Counting: Nanostructured Devices and Applications, 95550S (August 28, 2015).
Copyright 2015 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Funding: EPSRC (EP/J010413 and EP/J010391)
- carbon nanotubes
- fiber optic sensors
- localized surface plasmons
- nanostructured thin film
Allsop, T. D. P., Arif, R., Neal, R., Kalli, K., Kundrát, V., Rozhin, A., ... Webb, D. J. (2015). Localized surface plasmon fiber device coated with carbon nanotubes for the specific detection of CO2. In M. Razeghi, D. S. Temple, & G. J. Brown (Eds.), Optical Sensing, Imaging, and Photon Counting: Nanostructured Devices and Applications [95550S] (SPIE Proceedings; Vol. 9555). Bellingham, WA (US): SPIE. https://doi.org/10.1117/12.2187557