Catalyst-free synthesis of reduced graphene oxide–carbon nanotube hybrid materials by acetylene-assisted annealing graphene oxide

Abstract

A facile catalyst-free approach for synthesis of reduced graphene oxide-carbon nanotube (RGO-CNT) hybrid materials was presented by acetylene-assisted annealing graphene oxide. The weight ratio of CNTs to RGO can be adjusted by regulating the annealing temperature, and it can be tuned in a relatively wide range of 0.33 to 7.039. The catalyst-free method opens up the possibility for the synthesis of RGO-CNTs for various applications.

Thermostability, Photoluminescence, and Electrical Properties of Reduced Graphene Oxide–Carbon Nanotube Hybrid Materials

“…As reported previously, above 550 °C, the weight ratio of CNTs to RGO in RGO-CNTs shows a fast increase, and it can reach a high maximum of ca. 7.039 at 750 °C [20]. Evidently, the changing tendency of the thermostability of RGO-CNTs is in good agreement with the change of the content of CNTs in the RGO-CNTs.…”

“…The reason for the high C/O ratio of the RGO-CNT-650 may be (i) the more effective deoxygenation of GO annealed in acetylene than in Ar; and (ii) high-yield CNTs grew on the surface of RGO. As reported previously, the weight ratio of CNTs to RGO of RGO-CNT-550, RGO-CNT-650, RGO-CNT-750, and RGO-CNT-900 can be calculated, which are 1.006, 3.952, 7.039, and 6.247, respectively [20]. and to ~3000-3500 W mK −1 at room temperature, respectively.…”

“…Kim et al [18] fabricated G-CNTs using Al and Fe as catalysts under Ar, H 2 and C 2 H 2 gas atmosphere. Very recently, we synthesized reduced graphene oxide-CNT hybrid materials (RGO-CNTs) by a facile and catalyst-free route, and found that the weight ratio of CNTs to RGO can be adjusted in a relatively wide range of 0.33 to 7.039 by regulating the annealing temperature [20]. Herein, we reported the thermostability, photoluminescence (PL) and electrical properties of RGO-CNTs obtained.…”

“…As reported previously, RGO-CNTs were fabricated by a catalyst-free route [20]. Briefly, the graphene oxide (GO) was synthesized by chemical exfoliation of 5 g natural flake graphite powder (500 mesh) [21].…”

Controllable Growth of CNTs on Graphene as High-Performance Electrode Material for Supercapacitors

“…The undesired restacking of GN leads to a great loss of electrical double-layer and poor capacitances, which is unavoidable in annealing-assist reduction of GO. 34 On the other hand, because of that condition, an open porous structure is highly favorable for high SC performance. Therefore, a mass of pores generated during the pyrolysis for GN-CNT hybrids helps to achieve high EDLC when applied in a voltage range.…”