In this work, we present a novel technique to form a nano-rectenna based on single wall CNTs using a conductive atomic force microscope. The nano-rectenna exhibits a clear rectification behavior and sensitivity to light.
To optimize the performance
of carbon nanotube (CNT)-based rectennas,
we have studied the effect of metal work function on the photodetection
characteristics. Two materials of conducting nanoprobes, namely, gold
(Au) and platinum (Pt), have been used to form a rectifying diode
at the interface with the CNT. The electrical and optical characteristics
of single-wall carbon nanotubes (SWCNTs) dispersed on top of a SiO
2
/Si substrate have been investigated using a conductive mode
atomic force microscope (C-AFM). The I–V measurements performed
for both diodes have exhibited an explicit rectification behavior
with high sensitivity of a CNT-based rectenna to light. It has been
observed that the lower work function metal (Au) leads to a higher
on/off current ratio than the high work function metal (Pt). These
experimental observations will be explained using the material characterization
of the complete system along with representative energy-band diagrams.
In this paper, a new type of sensor and associated system for complete online monitoring of scale deposition with great accuracy and reliability is fabricated and characterized. The system is based on carbon nanotubes (CNTs), which have unique sensing/electronic properties along with physical and chemical stability in corrosive and hostile environments required for the oil and gas application. CNTs inkjet printing technique is used to fabricate the CNTs sensor. The sensitivity of the films, real time monitoring of brine solution, stability of the films in various solvents and fluids and the ability of setting and resetting of the sensor are studied. The results of these studies indicate that adding of one brine solution on the surface of the CNTs inkjet printing increases the resistance from 0.50 kΩ to 1.50 kΩ. The CNTs inkjet printing sample is found to be stable even after 48 hours of soaking the whole sample in DI-water. This sensor not only shows good sensing response for detection of the deposition of brine, but can also be easily reset back many times by just wash it with DI-water. This simple sensor is ideally suited for real time monitoring and the response time of the film is found to be from 15–30 s.
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