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The generation of microbubbles using localized microwatt heating of carbon nanotubes (CNTs) is presented in this paper. Dielectrophoretic force is used to form CNTs between micrometal electrodes. The improvement for our CNTs heater is that a thin aligned SiO2 film is employed to fix contact between metal electrodes and the CNTs, in order to decrease the heat loss from metal electrodes. The localized...
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...
This paper presents a theoretical investigation to evaluate and compare the capabilities of using dielectrophoresis (DEP) and optical image-driven dielectrophoresis (ODEP) forces for micro/nano scale manipulation. A simplified model of particle velocity as a function of electrode size and particle radius was derived based on Stokes' law. Then, electric field analysis of two typical electrode configurations...
This paper describes the assembly of 2 nm gold nanoparticles between micro-fabricated planar electrodes by using dielectrophoresis (DEP). The optimal conditions for effectively dieletrophoretic manipulation have been established through theoretical analysis and experimental validation. In the theoretical analysis, the effect of Brownian motion was taken into consideration, as well as the electrothermal...
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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