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The evaluation of the performance of two pyroelectric detectors with vertically aligned multi-walled carbon nanotube coatings.

Theocharous, S P*; Theocharous, E; Lehman, J H* (2012) The evaluation of the performance of two pyroelectric detectors with vertically aligned multi-walled carbon nanotube coatings. Infrared Phys. Technol., 55 (4). pp. 299-305.

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Abstract

The performance of two LiTaO3 pyroelectric detectors coated with vertically aligned multi walled carbon nanotube (MWCNT) black coatings has been evaluated using NPL's detector characterisation facilities. The vertically-aligned nanotube array (VANTA) black coatings were grown on a silicon substrate. They were subsequently lifted off the silicon and bonded on the pyroelectric crystal substrate. This method can be used to apply VANTA coatings on any substrate. The relative spectral responsivity of the VANTA-coated detectors was shown to be spectrally flat in the 0.8 µm to 14 µm wavelength range within the uncertainty of the measurements. The spatial uniformity of response of both detectors exhibited some fine structure which was assigned either to the VANTA black coatings or the way the coatings were bonded to the pyroelectric crystal substrate. Both coated and uncoated detectors exhibited a super-linear response. This observation was expected in the case of the uncoated detectors, but was surprising in the case of the coated detectors and indicates that the thermal conductivity of vertically aligned multi-walled carbon nanotubes is high along their lengths. The spatial variations of the phase delay experienced by the signal propagating through the VANTA coatings indicate that the thermal diffusivity of the coatings is not spatially uniform.

Item Type: Article
Subjects: Optical Radiation and Photonics
Optical Radiation and Photonics > Radiometry and Detectors
Identification number/DOI: 10.1016/j.infrared.2012.03.006
Last Modified: 02 Feb 2018 13:14
URI: http://eprintspublications.npl.co.uk/id/eprint/5541

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