Synthesis of single-walled carbon nanotubes from Pd catalysts by gas source method using ethanol in high vacuum

2015 ◽  
Vol 55 (1S) ◽  
pp. 01AE02 ◽  
Author(s):  
Akinari Kozawa ◽  
Takahiro Saida ◽  
Shigeya Naritsuka ◽  
Takahiro Maruyama
Keyword(s):  
Carbon Nanotubes ◽  
High Vacuum ◽  
Single Walled Carbon Nanotubes ◽  
Pd Catalysts ◽  
Single Walled Carbon ◽  
Source Method ◽  
Gas Source ◽  
Walled Carbon Nanotubes

scholarly journals Low Temperature Growth of Single-Walled Carbon Nanotubes from Pt Catalysts under Low Ethanol Pressure by Alcohol Gas Source Method

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
Hiroki Kondo ◽  
Naoya Fukuoka ◽  
Takahiro Maruyama
Keyword(s):  
Carbon Nanotubes ◽  
High Vacuum ◽  
Single Walled Carbon Nanotubes ◽  
Average Diameter ◽  
Diameter Distribution ◽  
Pt Catalysts ◽  
Single Walled Carbon ◽  
Source Method ◽  
Gas Source ◽  
Walled Carbon Nanotubes

Growth of single-walled carbon nanotubes (SWNTs) was carried out on SiO2/Si substrates with Pt catalysts at 400, 450, and 700°C under various ethanol pressures using an alcohol gas source method in a high vacuum, and the grown SWNTs were characterized by scanning electron microscopy (SEM) and Raman spectroscopy. Irrespective of the growth temperature, both G band and RBM peaks were observed in the Raman spectra under the optimal ethanol pressure (~1×10−3Pa), indicating that SWNTs grew below 450°C from Pt. At 400°C, both average diameter and diameter distribution were drastically reduced, and those were fairly smaller and narrower, compared to those for SWNTs grown with Co.

Separation of surfactant functionalized single-walled carbon nanotubes via free solution electrophoresis method

Open Physics ◽  
2011 ◽  
Vol 9 (2) ◽  
Author(s):  
Blazej Scheibe ◽  
Mark Rümmeli ◽  
Ewa Borowiak-Palen ◽  
Ryszard Kalenczuk
Keyword(s):  
Carbon Nanotubes ◽  
High Vacuum ◽  
Sodium Dodecyl ◽  
Single Walled Carbon Nanotubes ◽  
Separation Process ◽  
Optical Absorption Spectroscopy ◽  
Free Solution ◽  
Single Walled Carbon ◽  
Electrophoresis Method ◽  
Walled Carbon Nanotubes

AbstractThis work presents the application of the free solution electrophoresis method (FSE) in the metallic / semiconductive (M/S) separation process of the surfactant functionalized single-walled carbon nanotubes (SWCNTs). The SWCNTs synthesized via laser ablation were purified through high vacuum annealing and subsequent refluxing processes in aqua regia solution. The purified and annealed material was divided into six batches. First three batches were dispersed in anionic surfactants: sodium dodecyl sulfate (SDS), sodium cholate (SC) and sodium deoxycholate (DOC). The next three batches were dispersed in cationic surfactants: cetrimonium bromide (CTAB), benzalkonium chloride (BKC) and cetylpyridinium chloride (CPC). All the prepared SWCNTs samples were subjected to FSE separation process. The fractionated samples were recovered from control and electrode areas and annealed in order to remove the adsorbed surfactants on carbon nanotubes (CNTs) surface. The changes of the van Hove singularities (vHS) present in SWCNTs spectra were investigated via UV-Vis-NIR optical absorption spectroscopy (OAS).

scholarly journals Single-walled carbon nanotubes fractionation via electrophoresis

2011 ◽  
Vol 13 (3) ◽  
pp. 1-4 ◽  
Author(s):  
Blazej Scheibe ◽  
Pawel Lukaszczuk ◽  
Mark Rümmeli ◽  
Ryszard Kalenczuk ◽  
Ewa Borowiak-Palen
Keyword(s):  
Carbon Nanotubes ◽  
Diazonium Salt ◽  
High Vacuum ◽  
Single Walled Carbon Nanotubes ◽  
Optical Absorption Spectroscopy ◽  
Free Solution ◽  
Fractionation Process ◽  
Single Walled Carbon ◽  
Electrophoresis Method ◽  
Walled Carbon Nanotubes

Single-walled carbon nanotubes fractionation via electrophoresis This work presents the influence of the sonication time on the efficiency of the metallic/semiconducting (M/S) fractionation of diazonium salt functionalized single-walled carbon nanotubes (SWCNTs) via free solution electrophoresis (FSE) method. The SWCNTs synthesized via laser ablation were purified from amorphous carbon and catalyst particles through high vacuum annealing and subsequent refluxing processes in aqua regia solutions, respectively. The purified material was divided into two batches. The SWCNTs samples were dispersed in 1% SDS solution in ultrasound bath for 2 and 12 hours. Both dispersed SWCNTs samples were functionalized with p-aminobenzoic acid diazonium salt and fractionated via free solution electrophoresis method. Afterwards, the fractionated samples were recovered, purified from surfactant/functionalities by annealing and investigated via UV-Vis-NIR optical absorption spectroscopy (OAS). The efficiency of the fractionation process was estimated through the comparison of the van Hove singularities (vHS) presented in the obtained fractions to the starting SWCNTs.

scholarly journals Nickelocene-Filled Purely Metallic Single-Walled Carbon Nanotubes: Sorting and Tuning the Electronic Properties

Nanomaterials ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 2500
Author(s):  
Marianna V. Kharlamova
Keyword(s):  
Carbon Nanotubes ◽  
Electronic Properties ◽  
Low Temperatures ◽  
High Vacuum ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Annealing Temperatures ◽  
Conductivity Type ◽  
N Doping ◽  
Walled Carbon Nanotubes

We conducted the filling of single-walled carbon nanotubes (SWCNTs) with nickelocene molecules and separation of the filled SWCNTs by conductivity type by density-gradient ultracentrifugation. We tailored the electronic properties of nickelocene-filled purely metallic SWCNTs by thermal treatment in high vacuum. Our results demonstrated that annealing at low temperatures (360–600 °C) leads to n-doping of SWCNTs, whereas annealing at high temperatures (680–1200 °C) results in p-doping of SWCNTs. We found a correlation between the chemical state of the incorporated substances at different annealing temperatures and its influence on the electronic properties of SWCNTs.

Purity Evaluation of Single-Walled Carbon Nanotubes Using Thermogravimetric Analysis

2013 ◽  
Vol 51 (2) ◽  
pp. 137-144
Author(s):  
Naesung Lee ◽  
Jeung Choon Goak ◽  
Tae Yang Kim ◽  
Jongwan Jung ◽  
Young-Soo Seo ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Thermogravimetric Analysis ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Purity Evaluation ◽  
Walled Carbon Nanotubes
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