Ferrocene Derived Carbon Nanotubes and Their Application as Electrochemical Double Layer Capacitor Electrodes

Abstract

We report on the synthesis of carbon nanotubes (CNTs) by direct thermal decomposition of ferrocene (Fe(C5H5)2). Our studies indicate that presence of a small amount of sulfur along with the ferrocene in the decomposition process strongly affects the quality of the CNTs produced and is crucial for obtaining thin diameter nanotubes. Raman spectroscopic investigations suggest that the atomic ratio of sulfur to the total iron plus sulfur content of approximately 0.09 yields CNTs with highly crystalline structure having diameters ranging from 0.85 nm to 1.75 nm. Electrochemical double layer capacitor electrodes fabricated from these CNTs show impressive energy storage properties, capable of delivering a maximum power density of approximately 27 KW/kg and energy density of approximately 2.12 Wh/Kg.

Double resonance Raman study of disorder in CVD-grown single-walled carbon nanotubes

“…Samples 10 and 5 exhibit the lowest I D /I G ratio and hence highest quality among all samples. Independent observations by electron microscopy studies have proven the high quality of samples 10 and 5 [16]. The linewidths of the G and D bands ranged from ~10-30 cm -1 , and ~25-60 cm -1 , respectively.…”

“…Figure 3 shows the I D /I G ratios (left yaxis) for samples 20, 10, 5 and 3. The sample synthesized without any sulfur (sample 0) exhibited the highest I D /I G ratio among all samples [16]. In addition, the yield of SWNTs in sample 0 was poor, hence the spectra from sample 0 will not be discussed further.…”

Inner tube growth properties and electronic structure of ferrocene-filled large diameter single-walled carbon nanotubes

“…In such nanostructures, more prominent changes in electronic properties can be observed as result of filling and nanostructuring, and growth properties of inner tubes to be studied in depth, i.e., as a function of the tube diameter (). Such detailed information is important for applications of these nanostructures in nanoelectronics () and biosensing ().…”

High Adsorption of Benzoic Acid on Single Walled Carbon Nanotube Bundles

“…Here we show that adsorption capacity of benzoic acid on single walled carbon nanotube (SWNT) bundles synthesized by direct thermal decomposition of ferrocene (Fe(C 5 H 5 ) 2 ) 19,20 [and abbreviated as Fe-SWNT henceforth] is significantly higher than commercially available MWNTs. Results of our adsorption isotherm indicate that the sorption capacity of benzoic acid on these Fe-SWNT can be as high as 375 mg/g, which is about 5 times higher than those obtained for commercially available G-MWNT (~65 mg/g).…”