Photocurrent Response in Multiwalled Carbon Nanotube Core–Molybdenum
Disulfide Shell Heterostructures
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Abstract
In this report, a few-layer molybdenum
disulfide (MoS<sub>2</sub>) shell was coated on core multiwalled carbon
nanotube (CNT) by a facile solvothermal method. The morphology and
high crystallinity of this structure were demonstrated and verified
by transmission electron microscopy (TEM), X-ray diffraction (XRD),
Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS). After
being integrated into a planar device, the CNT–MoS<sub>2</sub> core–shell structure exhibits clear photoresponse and a wide
response range upon laser illumination. In addition, the device shows
a bias-dependent and position-sensitive photocurrent effect. Further
experiments show that larger photocurrent was obtained under laser
illumination with longer wavelength. Both the photocurrent and response
speed are enhanced when the device is placed under vacuum condition.
The simple material synthesis and device fabrication method used in
this work may provide a practical strategy for low-cost and large-scale
optical applications