NANOTUBE SENSORS AND ACTUATORS IN MECHANICS AND MEDICINE
Abstract (Summary)Highly aligned MWCNT (Multi-Walled Carbon Nanotube) has synthesized on the various substrates on the Si wafer and their effects are studied to understand the nature of CNT growth. Mainly three types of metal films, Fe, Fe/SiO2, and Fe/Al2O3/SiO2 on the Si wafers are deposited by e-beam evaporator, plasma oxidation, plasma laser deposition, and sputtering. Environmental scanning electron miscroscopy (ESEM), energy dispersive spectroscopy (EDS), high resolution transmission electron miscroscopy (HRTEM), and atomic force microscope (AFM) are used to analyze the CNT growth morphology. MWCNT can grow vertically aligned pattern up to 4 millimeter with floating water which has highly purity and easily peeled off from the substrate. The special electrochemical actuators properties of the different types of nanotubes and nanoscale materials are examined in this dissertation for intelligent nano materials. CNT array actuates up to 10 Hz without decreasing magnitude of strain. Only 1 - 2 voltages are applied to get 0.2% strain. And also the concept for an active catheter in nano-robot surgery was described using nanotube array actuators on both telescoping and electrochemical methods. Initial studies of cell-nanotube interaction were presented in this chapter. 3T3 fibroblast cells on glass substrates coated with chemically functionalized carbon nanotube and nanofiber materials were grown and exam the nanotube-fiberblast cell interaction. Various CNTs biosensors are developed which include the their exceptional properties, the difficulties in processing nanoscale materials, and it also presents possibilities for building futuristic, and preliminary bio-devices for monitoring systems. Cyclic voltammetry (CV) with 6 mM K3Fe(CN)6 and Cl3Ru(NH3)6 in 1.0 M KNO3 solution is performed to analyze the redox behavior of the nanotube tower electrodes and showed ideal steady-state voltammetric behavior explained by radial diffusion with a high steady-state current density. Anti-immunoglobulin was immobilized on the nanotube electrodes, and electrochemical impedance spectroscopy (EIS) is done to monitor with the addition of mouse immunoglobulin. Electrochemical immunosensors as label-free method to detect angiogenic molecules and bone marker for understanding the cancer metabolisms and osteoporosis is described briefly in this dissertation too. This content discusses future cancer and osteoporosis sensor development based on the carbon nanotube array as the working electrode.
School:University of Cincinnati
School Location:USA - Ohio
Source Type:Master's Thesis
Date of Publication:01/01/2006