Aspect ratio control of acid modified multiwalled carbon nanotubes

Kim, Don-Young; Yun, Young Soo; Bak, Hyeonseong; Cho, Se Youn; Jin, Hyoung‐Joon

doi:10.1016/j.cap.2009.12.038

Cited by 33 publications

(22 citation statements)

References 33 publications

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“…Besides, Kim, D.Y. et al [24], showed that the optical absorbance increases with increasing average CNT length. However, in the present work, the absorption spectra of prepared CNTs (at 800°C) were measured in the spectrum range 200-3,000 nm as shown in Fig.…”

Section: Prepared Carbon Nantubesmentioning

confidence: 97%

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Physical characterizations of semi-conducting conjugated polymer-CNTs nanocomposites

2012

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Carbon nanotubes (CNTs) were prepared using Alcholic Catalyst Chemical Vapor Deposition (ACCVD) technique in order to investigate the effects of their addition on the optical, electrical and mechanical properties of Poly (3-octylthiophene-2,5-diyl) (P3OT) matrix. The absorption spectra of the prepared CNTs and CNT-P3OT nanocomposites were measured in the spectral range 200 nm-3,000 nm at room temperature. The optical energy gap was determined from the obtained UV/Vis absorption spectrum. Optical results reveal that the prepared CNTs are almost single walled. Besides, the addition of CNTs to P3OT polymer matrix will decrease the optical energy gap and enhance the optical absorbance of P3OT matrix. On the other hand, the addition of CNTs to P3OT matrix will increase the electrical conductivity of P3OT matrix up to four orders of magnitude above the percolation threshold (0.44 wt% CNTs). Additionally, I-V characteristics indicate that the conduction mechanism is Ohmic at low applied voltage range while it is due to the trap charge limited at high applied voltage range. Furthermore, the behavior of dc conductivity with temperature was also investigated and the obtained results reveal that the activation energy decreases with CNTs content. Finally, mechanical results reveal that the elastic modulus values increase with the increasing of CNTs content in P3OT matrix.

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Section: Prepared Carbon Nantubesmentioning

confidence: 97%

“…One of the power full analyses used to recognize both the existence and quality of SWCNTs is UV-visible and NIR spectra [22][23][24]. Jeong, M.S.…”

Section: Prepared Carbon Nantubesmentioning

confidence: 99%

Physical characterizations of semi-conducting conjugated polymer-CNTs nanocomposites

2012

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“…Lower aspect ratio of the MWCNTs in the injection moulded samples can also be considered as another reason for higher volume resistivity of the injection moulded samples. Other studies showed that decrease in MWCNT aspect ratio can lead to lower conductivity and higher percolation threshold, due to significant decrease in chance of MWCNTs contacting each other [19,20].…”

Section: The Effects Of Mwcnt Alignment and Length On The Dielectric mentioning

confidence: 98%

An innovative method to reduce the energy loss of conductive filler/polymer composites for charge storage applications

Arjmand

Mahmoodi

Park

et al. 2013

Composites Science and Technology

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“…Figure 12 shows the absorption spectra as a function of photon energy at NIR region. From Figure 12(a), one can clearly observe the characteristic peaks (peak I and peak II) for CNT at around 0.78 eV and 1.35 eV [44] when the preparation temperature is 800˚C. Such results indicate that the prepared CNTs are mostly single walled type at least at preparation temperature of 800˚C.…”

Section: Uv-vis/nir Spectroscopymentioning

confidence: 76%

“…et al [38], show that the optical absorbance increases with increasing average CNTs length. However, one of the power full analyses used to recognize both the existence and quality of SWCNTs is UV-visible and NIR spectra [43][44][45].…”

Section: Uv-vis/nir Spectroscopymentioning

confidence: 99%

Synthesis of Carbon Nano Tubes on Silicon Substrates Using Alcohol Catalytic Chemical Vapor Deposition

Abu-Abdeen¹,

Aljaafari²

2011

MSA

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The technique used for synthesizing large quantity carbon nanotubes (CNTs) directly on the surface of silicon substrates has been developed by means of the alcohol catalyst chemical vapor deposition ACCVD method using ethanol. The proposed method adopts an easy and costless liquid-based dip-coat approach for mounting the catalytic metals on the substrates. Reasonable quality formation of catalyst preparation was found at 5 min of dipping the substrate into cobalt acetate solution and withdrawing at speed of 4 cm/min followed by heat treatment at 400°C. Cobalt acetate catalyst on silicon substrates were analyzed using an atomic force microscopy (AFM) and scanning electron microscopy (SEM). The substrate surface is blackened with a layer of CNTs after the ACCVD at an optimum condition. The grown CNTs were analyzed using transmission electron microscopy TEM, SEM, XRD, UV/Vis-NIR spectroscopy and photoacoustic (PA) measurements of thermal parameters. Large quantities of single and multi walled carbon nanotubes were grown at a growth time of 50 min and growth temperatures of 800 and 900°C. UV-Vis/NIR spectroscopy detected two absorption peaks at 0.78 and 1.35 eV and optical energy gap (E<sub>opt</sub>) of 1.16 eV for CNTs grown at 800°C. The PA measurements of thermal parameters detected maximum values of thermal diffusivity, effusivity and conductivity for those grown at 800°C

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Aspect ratio control of acid modified multiwalled carbon nanotubes

Cited by 33 publications

References 33 publications

Physical characterizations of semi-conducting conjugated polymer-CNTs nanocomposites

Physical characterizations of semi-conducting conjugated polymer-CNTs nanocomposites

An innovative method to reduce the energy loss of conductive filler/polymer composites for charge storage applications

Synthesis of Carbon Nano Tubes on Silicon Substrates Using Alcohol Catalytic Chemical Vapor Deposition

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