Study Of Vapor Deposition Of One-dimensional Carbon Materials With Electrodeposited Metal Catalysts

Carbon materials exist widely and can be obtained easily. One-dimensional carbon materials have potential applications in fuel cell, lithium ion battery and chemical sensor due to their high specific surface area and good conductivity.Used as electrode materials, the electroactive materials must contact with substrates well and low contact resistance between active materials and substrate is needed. Now, one-dimensional carbon materials are usually coated on the electrode with binder or by hot press method, which results in a high contact resistance between the active materials and electrode. Moreover, the procedure for prepare the electrode is so complex and the cost of the preparation are high. These materials grown directly on substrates can deal with the above problems successfully, but the preparations of catalysts on substrates in currently are complex and expensive as well. This paper reports a new method to prepare catalysts directly on substrate, which is more simple and economical. Additionally, the dispersion, diameter and structure of the catalysts can be controlled easily using this method. In this thesis, the following achievements have been made:1. Carbon fibers grown directly on graphite substrate are fabricated firstly using electrodeposited nickel particles and the effect of catalysts deposited from various disposition bath solutions on the growth of carbon fibers are discussed. The results indicate that carbon fibers fabricated by different deposited nickel particles have different micrographs.2. Carbon nanotubes (CNTs) grown directly on graphite substrate are fabricated firstly using electrodeposited iron particles by chemical vapor deposition. Most of CNTs have "Y" junction structure. Effects of deposition time, current density and kinds of catalysts on the growth of carbon nanotubes are discussed.3. Aligned Carbon nanotube arrays are successfully synthesized by hot filament assisted DC plasma enhanced chemical vapor deposition without ammonia at the first time. The catalyst is iron or cobalt prepared by gavaniststic or pulse deposition. Effects of temperature, pressure, catalysts and substrates on the growth of aligned carbon nanotubes are discussed. Additionally, growth process of aligned carbon nanotubes is also monitored.