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2015 ; 5
(ä): 17883
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Bolometric-Effect-Based Wavelength-Selective Photodetectors Using Sorted Single
Chirality Carbon Nanotubes
#MMPMID26643777
Zhang S
; Cai L
; Wang T
; Shi R
; Miao J
; Wei L
; Chen Y
; Sepúlveda N
; Wang C
Sci Rep
2015[Dec]; 5
(ä): 17883
PMID26643777
show ga
This paper exploits the chirality-dependent optical properties of single-wall
carbon nanotubes for applications in wavelength-selective photodetectors. We
demonstrate that thin-film transistors made with networks of carbon nanotubes
work effectively as light sensors under laser illumination. Such photoresponse
was attributed to photothermal effect instead of photogenerated carriers and the
conclusion is further supported by temperature measurements. Additionally, by
using different types of carbon nanotubes, including a single chirality (9,8)
nanotube, the devices exhibit wavelength-selective response, which coincides well
with the absorption spectra of the corresponding carbon nanotubes. This is one of
the first reports of controllable and wavelength-selective bolometric
photoresponse in macroscale assemblies of chirality-sorted carbon nanotubes. The
results presented here provide a viable route for achieving
bolometric-effect-based photodetectors with programmable response spanning from
visible to near-infrared by using carbon nanotubes with pre-selected chiralities.