Essay on A Report On The And G Bands

Essay on A Report On The And G Bands

Length: 1130 words (3.2 double-spaced pages)

Rating: Better Essays

Open Document

Essay Preview

D- and G-bands represent sp3 (disordered graphite) and sp2 (ordered graphite) bonding, respectively. The relative crystallinity of the materials was determined from the intensity ratio (D/G) of G-band and D-band. The ID/IG ratios of Figs. 8(a), (b), and (c) are 1.423, 1.685, and 1.012, respectively. Because the ID/IG ratio of Fig. 8(c) was close to 1, the bonding ratios of sp3 and sp2 were similar. As the intensity of Fig. 8(c) was higher than those of Figs. 8(a) and (b), the crystallinity of the material in Fig. 8(c) was relatively higher.

3.7 Thermogravmetric Analysis
The mass change and thermal characteristics of the synthesized mesoporous SiO2 and mesoporous SiO2-CNFs composites with temperature were investigated by TGA in N2 atmosphere, and the result is shown in Fig. 9. TG analysis was conducted as follows: each sample less than 30 mg was collected in N2 atmosphere at temperatures ranging from 25 °C to 800 °C, and the gas flow and heating rate were adjusted to 40 mL/min and 10 °C/min, respectively. As shown in Fig. 9(a), the TG curve of mesoporous SiO2 showed a decrease in the mass in the temperature range ~550–600 °C. In Fig. 9(b), the TG curve of mesoporous SiO2-CNFs composite also showed a rapid decrease in mass in the range temperature range ~550–600 °C, indicating the presence of mesoporous SiO2. The content of mesoporous SiO2 in the mesoporous SiO2-CNFs composite was estimated to be 7 wt%.

3.8 Cyclic Voltammetry
Fig. 10 shows the cyclic voltammograms, when synthesized CNFs and mesoporous SiO2-CNFs composites were used as the anode materials of Li secondary battery at a current of 100 mA/g in the potential range of 0.1–2.0 V (vs. Li/Li+).
In lithium adsorption and desorption reactions of an electrode, particular si...


... middle of paper ...


...h theoretical capacity of Si. As shown in (b)–(c), the capacity varied depending on the preparation methods of mesoporous SiO2–CNFs composites. Mesoporous SiO2–CNFs composites, synthesized after depositing Fe–Cu catalyst and mesoporous SiO2 on Ni foam did not show relatively good performances compared to the case of binder free, probably SiO2 could not play its role, because the carbon nanofibers were grown the presence of Fe–Cu catalyst.
In contrast, as shown in Fig. 12(c), mesoporous SiO2–CNFs composites synthesized after depositing mesoporous SiO2 on Ni foam without catalyst showed the growth of carbon nanofibers, because Ni foam played a role as the catalyst. Thus, (c) had higher capacity because mesoporous SiO2 than (b) in which many carbon nanofibers were grown. Moreover, carbon nanofibers were appropriately grown. Thus, the retention rate was relatively high.

Need Writing Help?

Get feedback on grammar, clarity, concision and logic instantly.

Check your paper »

Essay about The Minority Report By Philip K. Dick

- The Minority Report by Philip K. Dick tells the story of a dystopia society that apropos the concept of a post-crime system called Precrime. This successful short story follows the protagonist, John A. Anderton, Precrime Commissioner, living in a futuristic society, Precrime police officers prevent homicides with the aid of precog mutants; precrime methodology has boldly and successfully abolished the post-crime system of jails and fines. However, Precrime has created an unfavorable recalcitrant idea: Citizens believe they are constantly under surveillance....   [tags: Philip K. Dick, Minority Report]

Better Essays
1088 words (3.1 pages)

Essay on Report on the Grateful Dead

- Report on the Grateful Dead I have chosen to do my report on the Grateful Dead. They were a rock and roll band from the sixties that stayed popular and still influenced rock and roll until 1995 when the lead singer, Jerry Garcia, died and the band dissolved. The Dead remained popular for so long because of the style of their live concerts that made people keep coming back. In 1959 when Jerry Garcia was thrown out of the army, he picked up his guitar and started playing music with his friend Robert Hunter....   [tags: Music Musicians Bands Grateful Dead Essays]

Better Essays
1316 words (3.8 pages)

Essay about The Social Media Report and Families

- Growing up, we rely on our parents to teach us the ways of life. Not only that, but they show us how to dress, how to speak, what is considered good or bad, and help us to determine how we see ourselves. As children, our parents were our guardians, teachers, and caretakers. Unfortunately, once we grow up we stop depending on our parents to teach us the ways of life and start relying on the media instead. In the 21st century, mass media is the informational outlet to all human beings in the world....   [tags: internet, way of life]

Better Essays
764 words (2.2 pages)

Led Zeppelin's Houses of the Holy Essay

- Led Zeppelin's Houses of the Holy Led Zeppelin is arguably one of the best rock n’ roll bands of all time. They were collectively some of the best musicians ever to play rock n’ roll music, and were also great lyricists. Robert Plant (the lead vocalist) was quoted as saying that for some of the songs that he wrote, he felt that someone pushed the pen for him. Whether some mysterious force was moving his hand or not, one things for sure, Led Zeppelin wrote some timeless masterpieces of music. They were formed from the ashes of British blues-rockers the Yardbirds....   [tags: Led Zeppelin Rock N' Roll Bands Essays]

Free Essays
5007 words (14.3 pages)

The 1980s Music Report Essay

- In 1981 MTV "Music Television" was introduced on cable television and revolutionized rock marketing. Just as FM radio had superseded the hit-oriented AM format, music videos, produced as mini-movie advertisements for songs, became essential to a performer's popularity. Early in the decade, the British group the Police was one of the first to combine a progressive sound with polished videos. The expense of producing videos and MTV's virtual monopoly made it difficult for experimental music to compete with the dance-pop sung by American artists like Michael Jackson, Prince, Whitney Houston, and Madonna, and the British groups Duran Duran and Depeche Mode....   [tags: Music]

Free Essays
877 words (2.5 pages)

Rock Bands Essay examples

- Along with the Beatles, The Rolling Stones are one of the most famous English rock bands to influence America. Introducing teenagers to African American urban blues, and transforming the urban blues into something like high-energized rock and roll are just some of the things the Stones brought to America (Kallen 10-11). The original line-up of the band included; Bill Wyman, Charlie Watts, Brian Jones, Mick Jagger, and Ian Stewart (Kallen 8-9). They have come a long way to get where they are now, and to this day they are still playing their music around the world....   [tags: Music, The Beatles, The Rolling Stones]

Better Essays
1698 words (4.9 pages)

Western Expansionism Essay

- The pressures of white expansionism led the United States Government to find ways to remove the Native Americans from their fertile lands. Spurred by this pressure, and the need to fulfill his campaign promise to open Indian land for settlement, Andrew Jackson pushed through Congress the Removal Act. The Act allowed the government to negotiate treaties with the various Native American tribes, pay them for their lands, relocate them to western lands, and support the tribes for one year after removal....   [tags: Native Americas displaced report]

Free Essays
997 words (2.8 pages)

Essay on Alternative Bands

- Throughout the years there have been many rock-style bands that did not quite fit on rock radio. These bands soon came to be played on "alternative" radio, such as college, community, and pirate stations. Hence the alternative rock moniker stuck for these uniquely different rock bands. Some of my favorite alternative bands from the early 1990's include Smashing Pumpkins, Pearl Jam, Nirvana, Alice in Chains, and Radiohead. The Smashing Pumpkins follow their lead singer's, Billy Corgan, theory that, "Great music completely obliterates any conceptions of genre." The Smashing Pumpkins took their local Chicago sound of metal, alt-rock, psychedelic dream pop, and shared it with the world....   [tags: Music]

Free Essays
437 words (1.2 pages)

Essay on Jam bands

- Jam bands I have played music for over 11 years and I have studied different types of music, like Jazz and blues. But now there is a style that blends these two and more together. This style is called Jam bands. They have been around for years but it did not have a name until now. But it does not just have to do with the band it also has a lot to do with the fans. There is a type of dress and things that they say. I will tell the type of dress, the way the fans talk, and the different bands that are in the scene....   [tags: Papers]

Free Essays
487 words (1.4 pages)

Rock Bands Essay

- There have been all kinds of different types of rock bands throughout the years. Most of the bands have had a different type of style. All of these different types of style are what has shaped today’s music. Some of the bands from the earlier times were: The Beatles, AC/DC, Guns and Roses and the Bee Gees. The Beatles were the greatest and most powerful act of the rock era. They introduced more innovations into popular music than any other rock band of the 20th century. The Beatles grabbed a hold of the attention in 1964 and never let go for the next six years....   [tags: essays research papers]

Better Essays
1705 words (4.9 pages)