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2015 ; 5
(ä): 10546
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Multiple MoS2 Transistors for Sensing Molecule Interaction Kinetics
#MMPMID26014289
Nam H
; Oh BR
; Chen P
; Chen M
; Wi S
; Wan W
; Kurabayashi K
; Liang X
Sci Rep
2015[May]; 5
(ä): 10546
PMID26014289
show ga
Atomically layered transition metal dichalcogenides (TMDCs) exhibit a significant
potential to enable next-generation low-cost transistor biosensors that permit
single-molecule-level quantification of biomolecules. To realize such potential
biosensing capability, device-oriented research is needed for calibrating the
sensor responses to enable the quantification of the affinities/kinetics of
biomolecule interactions. In this work, we demonstrated MoS2-based transistor
biosensors capable of detecting tumor necrosis factor--alpha (TNF-?) with a
detection limit as low as 60 fM. Such a detection limit was achieved in both
linear and subthreshold regimes of MoS2 transistors. In both regimes, all sets of
transistors exhibited consistent calibrated responses with respect to TNF-?
concentration, and they resulted in a standard curve, from which the equilibrium
constant of the antibody-(TNF-?) pair was extracted to be KD = 369 ± 48 fM. Based
on this calibrated sensor model, the time-dependent binding kinetics was also
measured and the association/dissociation rates of the antibody-(TNF-?) pair were
extracted to be (5.03 ± 0.16) × 10(8) M(-1) s(-1) and (1.97 ± 0.08) × 10(-4)
s(-1), respectively. This work advanced the critical device physics for
leveraging the excellent electronic/structural properties of TMDCs in biosensing
applications as well as the research capability in analyzing the biomolecule
interactions with fM-level sensitivities.