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Selective synthesis of single-walled carbon nanotubes (SWCNTs) is highly desirable for various applications. Among the strategies proposed for achieving this, the method involving sulfur-containing compounds is a promising approach showing the conversion of common cobalt/silica catalysts (Co/SiO2) into chirality selective catalysts. However, the possible influence of sulfur-containing compounds in...
An efficient dual catalyst of molybdenum carbide nanoparticles embedded nitrogen-doped porous carbon nanofibers (Mo2C/NPCNFs) has been developed for hydrogen evolution reaction (HER) and oxygen reduction reaction (ORR). The well-aligned and nanoporous identity of the desirable hybrid Mo2C/NPCNFs by an electrospun approach provides the good conductivity and rich active sites addressing excellent HER...
An emerging class of carbon nanomaterials (CNMs), in particular graphene-based materials and carbon nanotubes, has been extensively studied for its extraordinary water transport and sieving properties. However, harnessing the full potential of these CNMs as separation membranes for water treatment and desalination is a challenge. As such, we identify five strategic areas of focus, namely, concentration...
Electroless Ni-P coating was plated on the surface of multi-walled carbon nanotubes (MWCNTs). The Ni-P coated carbon nanotubes (NiPCNTs) were dispersed into Inconel 718 (IN718) powder by ball milling. Then the powder mixtures were deposited into the IN718/NiPCNTs composite coatings by laser powder deposition process. The survivability of MWCNTs, susceptibility to heat affected zone (HAZ) liquation...
The chiral structures of single-walled carbon nanotubes (SWCNTs) can greatly affect their electronic, optical, thermal, mechanical and magnetic properties. As such, it has been a long-standing goal to selectively synthesize single chirality SWCNTs for potential applications ranging from electronics to medicine. Catalytic chemical vapor deposition is the prevalent method for chirality selective synthesis...
We demonstrated the synthesis of single-walled carbon nanotubes (SWCNTs) with narrow chiral distribution on cobalt incorporated MCM-41 catalyst using ethanol as carbon feedstock by remote plasma enhanced chemical vapor deposition. The use of remote plasma enables the decomposition of the nontoxic ethanol to occur away from the site of SWCNT growth. This allows separate manipulation of carbon radical...
Carbon black (CB), multi-walled carbon nanotube (MWCNT), and graphene (GN) were examined as catalytic films on the counter electrodes (CEs) of dye-sensitized solar cells (DSSCs). GN exhibits the best performance among these materials for the corresponding cell. A composite film of GN/Nafion® was next used as the catalytic film on the CE of a DSSC. Nafion® is demonstrated to be an excellent dispersant...
We effectively tailored the charge trapping and transport behavior of a carbon nanotube field effect transistor memory device using charge interaction with underlying Ge nanoparticles in a HfO 2 high-κ dielectric. We also suggest a new route for modulating the Schottky barrier at the nanotube–electrode interface with localized charge trapping in discrete nanoparticles. This modification leads...
Recent studies have demonstrated that significantly low sheet resistance (Rs) (<100 Ω/sq; comparable to ITO) were achieved in single-walled carbon nanotube (SWCNT) films treated with HNO 3 followed by thionyl chloride. Here we show that H 2 SO 4 can effectively reduce the Rs of SWCNT electrodes. H 2 SO 4 treatment generates defects (COOH and SO 3 ...
Chemical vapor deposition growth of single-walled carbon nanotubes (SWCNTs) was studied using three representative carbon source sources: CO, ethanol, and methane, and a catalyst of Ni ions incorporated in MCM-41. The resulting SWCNTs were compared for similar reaction conditions. Carbon deposits were analyzed by multi-excitation wavelength Raman, TGA, TEM and AFM. Catalytic particles in the Ni-MCM-41...
Highly ordered MCM-41 mesoporous molecular sieves in which silicon was isomorphously substituted with 0.5–4wt.% cobalt were synthesized using an alkyl template with a 16 carbon atoms alkyl chain length. These materials were used as catalysts for the synthesis of uniform diameter single wall carbon nanotubes (SWNT) by CO disproportionation (Boudouard reaction). The SWNT synthesis conditions were identical...
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