Hydrogenation-assisted unzipping of carbon nanotubes to realize graphene nano-sheets

Ionic liquid-functionalized partially exfoliated multiwalled carbon nanotubes for high-performance supercapacitors

“…Recently, the scientic community has unraveled walls of carbon nanotubes into graphene nanoribbons by various methods. [7][8][9][10][11] Several mechanisms have been proposed on the unzipping of carbon nanotubes. [12][13][14] Kosynkin et al have unraveled graphene nanoribbons from MWNTs by cutting concentric cylindrical layers lengthwise using a simple solutionbased oxidative process and studied their electrical properties.…”

“…Several attempts have been experimented to cut (both tangential and lengthwise) and open MWNTs for various applications, including supercapacitors. A numerous amount of recent research outputs on unraveling graphene nanoribbons from MWNTs [7][8][9][10][11]18 and on the mechanism 12,14,19 are the evidence for the potential of this material. Supercapacitors with PEMWNTs have been reported with aqueous electrolyte, which show much better specic capacitance compared to MWNTs.…”

Carbon Nanotubes (CNTs) from Synthesis to Functionalized (CNTs) Using Conventional and New Chemical Approaches

“…On the other hand, Talyzin et al showed the multifunction of molecular hydrogen through hydrogenation, purification, and unzipping of carbon nanotubes; hydrogenation of nanotubes is realized at 400- this study demonstrated that nanotube diameter is the main variable for hydrogenation degree of the nanotube whereas a value of around 2.0 nm for the diameter makes the nanotube hydrogen complexes close to 100% hydrogenation [188]. In addition, Mohammadi et al interpreted this change in the CNT diameter by the incorporation of H atom into CNT structure [189]. Advanced research related to CNTs relies that on increasing their properties including different CNTs forms as spaghetti MWCNTs using hydrogenation, as reported by Kazemi et al, thanks to MWCNT structure and wettability [190].…”

Optical Unzipping of Carbon Nanotubes in Liquid Media

“…Various approaches have been developed to date to unzip CNTs to achieve GNRs, and some of the notable ones include: longitudinal unzipping via catalytic oxidation, plasma etching of partly embedded CNTs, gas-phase oxidation followed by sonication, surface-assisted coupling of molecular precursors into linear polyphenylenes and subsequent cyclodehydrogenation, self-organized growth on a templated silicon carbide substrate, and acid cutting along the folded edges via reaction with molecular hydrogen , or by electrochemical unzipping . Electric fields have also been proposed to unzip CNTs .…”

“…25 Moreover, due to their sp 2 carbon lattice and edges states, 26,27 GNRs find applications in exhibiting high magnetoresistance, 28,29 as electronic devices, 30−34 as magnetic field sensors, 35 as transparent conducting electrodes, 36 and as nanofillers for strengthening polymers. 37,38 Various approaches have been developed to date to unzip CNTs to achieve GNRs, and some of the notable ones include: longitudinal unzipping via catalytic oxidation, 39 plasma etching of partly embedded CNTs, 40 gas-phase oxidation followed by sonication, 41 surface-assisted coupling of molecular precursors into linear polyphenylenes and subsequent cyclodehydrogenation, 42 self-organized growth on a templated silicon carbide substrate, 43 and acid cutting along the folded edges 44 via reaction with molecular hydrogen 45,46 or by electrochemical unzipping. 47 Electric fields have also been proposed to unzip CNTs.…”