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2015 ; 5
(ä): 11328
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Wrapping cytochrome c around single-wall carbon nanotube: engineered nanohybrid
building blocks for infrared detection at high quantum efficiency
#MMPMID26066737
Gong Y
; Liu Q
; Wilt JS
; Gong M
; Ren S
; Wu J
Sci Rep
2015[Jun]; 5
(ä): 11328
PMID26066737
show ga
Biomolecule cytochrome c (Cty c), a small molecule of a chain of amino acids with
extraordinary electron transport, was helically wrapped around a semiconductive
single-wall carbon nanotube (s-SWCNT) to form a molecular building block for
uncooled infrared detection with two uniquely designed functionalities: exciton
dissociation to free charge carriers at the heterojunction formed on the
s-SWCNT/Cty c interface and charge transport along the electron conducting chain
of Cty c (acceptor) and hole conducting channel through s-SWCNT (donor). Such a
design aims at addressing the long-standing challenges in exciton dissociation
and charge transport in an SWCNT network, which have bottlenecked development of
photonic SWCNT-based infrared detectors. Using these building blocks, uncooled
s-SWCNT/Cyt c thin film infrared detectors were synthesized and shown to have
extraordinary photoresponsivity up to 0.77 A W(-1) due to a high external quantum
efficiency (EQE) in exceeding 90%, which represents a more than two orders of
magnitude enhancement than the best previously reported on CNT-based infrared
detectors with EQE of only 1.72%. From a broad perspective, this work on novel
s-SWCNT/Cyt c nanohybrid infrared detectors has developed a successful platform
of engineered carbon nanotube/biomolecule building blocks with superior
properties for optoelectronic applications.