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We demonstrate field-effect transistors (FETs) fabricated on the basis of individual carbon nanotubes (CNTs) with top- and side-gate configurations using two different dielectric layers, SiO2 and Al2O3. Transport properties of the FETs are investigated using noise spectroscopy before and after low-dose gamma irradiation treatment (106 rad). A strong generation-recombination (GR) noise component observed...
A highly sensitive and stable L-Lactate sensor based on the synergic action of multi-wall carbon nanotube (MWCNTs) and ZnO nanoparticles has been developed. The unique sandwich-like layer structure (PDDA/LOD/ZnO/MWCNTs) provides a favorable microenvironment to keep the bioactivity of LOD and prevent enzyme molecule leakage. Therefore, the proposed L-Lactate biosensor exhibited good analytical performances...
This paper describes a process to perform nanoscale welding of multi-walled carbon nanotubes (MWCNTs) using a conductive atomic force microscopy (AFM) tip. An AFM tip can be used not only to apply a mechanical force to push, drag or scratch a sample, but also to exert an electrostatic force between the conductive tip and a sample substrate by applying a bias voltage. This electrostatic field will...
Signal-to-Noise Ratio (SNR) is a very essential parameter in determining a sensor's performance and ultimate resolution limit. For conductance-based CNTs chemical sensors, how to increase the response and suppress the noise is a critical issue in optimizing the sensor performance. In this paper, we discuss our experiments performed on conductance-based CNTs sensors, which were fabricated by DEP manipulation,...
In this study, it was demonstrated that full semiconductor device yield can be achieved using SWNT solutions prepared by selective functionalization of SWNTs with diazonium reagents and followed by density gradient ultracentrifugation (DGU) to remove most of M species and impurities. By increasing the network thickness, the effective mobility of the devices can be raised to ~10 cm2/V-s while keeping...
This paper presents the design and characterization of a novel micro motion sensor using Carbon Nanotube (CNT) sensing element. This sensor is based on thermal convective sensing theory, and uses CNT bundles manipulated by dielec-trophoretic (DEP) forces to form the motion sensing element. The heat generation CNT bundle is first heated up in a micro chamber using constant current. External acceleration...
Ethanol vapor sensors utilizing functionalized carbon nanotubes as sensing elements have been successfully built. The Au microelectrodes on the silicon substrate were fabricated by MEMS technology and the carbon nanotubes connection was achieved by DEP manipulation. Chemical oxidation method was used to graft functional groups such as COOH and OH on multi-walled nanotubes (MWNTs). Sensor performance...
Recovery time, which is one of the key metrics in gauging sensor performance, is crucial for CNTs sensors since it directly affects the reusability, reliability and accuracy of the sensors during detection. Using the resistive f-CNTs based ethanol vapor sensor as an example, we proved that the annealing method of heating up the sensor with a sufficient high current for a certain time period can effectively...
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