Facile single pot synthesis of MnO2 nanorods-reduced graphene oxide (rGO) nanocomposite: Structural, chemical and field emission investigations

Uncovering the origin of enhanced field emission properties of rGO–MnO2heterostructures: a synergistic experimental and computational investigation

“…A comparison between the turn-on eld values obtained in the present study and previously reported MnO 2 nanostructures and the MnO 2 /rGO nanoheterostructures is provided in Table 1. 21,22,[61][62][63][64][65][66] The Fowler-Nordheim (F-N) plot for MnO 2 nanorods and rGO/MnO 2 nano-heterostructure obtained from ln(J/E 2 ) verses (1/E) is shown in Fig. 3(c and d).…”

“…Among transition metal oxides, manganese dioxide (MnO 2 ) has attracted increasing interest for eld emission applications, owing to their wide structural diversity combined with unique chemical and physical properties. 21,22 The advantages of MnO 2 as eld emitter are the lower cost for raw materials and the fact that manganese is more environmentally friendly than other metal oxide. 23,24 MnO 2 has also attracted a lot of attention as an electrochemical pseudocapacitor material due to its high theoretical capacitance (1370 F g À1 ).…”

Realization of Efficient Field Emitter Based on Reduced Graphene Oxide‐Bi2S3 Heterostructures

“…Recently, our group has investigated FE characteristics of pristine Bi 2 S 3 and Bi 2 S 3 –CdS heterostructures, synthesized via a single‐step hydrothermal route . Furthermore, the FE behavior of various rGO‐based heterostructures, such as rGO‐WS 2 , rGO‐MoS 2 , rGO‐MnO 2 , and rGO‐TiO 2 , has been investigated. The results imply that the rGO‐based heterostructures exhibit superior FE performance as compared with pristine counterparts .…”

“…Furthermore, the FE behavior of various rGO‐based heterostructures, such as rGO‐WS 2 , rGO‐MoS 2 , rGO‐MnO 2 , and rGO‐TiO 2 , has been investigated. The results imply that the rGO‐based heterostructures exhibit superior FE performance as compared with pristine counterparts . Following this, it is of both scientific and technological importance to undertake systematic studies on synthesis, characterization, and FE behavior of rGO‐Bi 2 S 3 heterostructures, which are hitherto not attempted.…”

Updating the Role of Reduced Graphene Oxide Ink on Field Emission Devices in Synergy with Charge Transfer Materials

“…Apart from the previous techniques, chemical oxidation of bulk graphite by Hummers is a strong candidate for resulting to the high yield production of graphene oxide (GO). For instance, a low-cost and successful chemical method to synthesize FE-applicable reduced GO, the Annual-Ring Graphene (ARG) method [31], which demonstrates the advantage of facile synthesis, yields abundant vertical edges on the cross-section of ARG, hence equaling or even surpassing FE performances of CNT [13], cannon-structured graphene film [32] and rGO/MnO2 composite [33], not to mention the ultralight weight and flexible nature of the cathode. In general, albeit GO has a similar atomic single layer structure to graphene, the existence of oxygen functional groups attached onto sp 3 hybridized carbon atoms impacts on its conductivity loss, mainly due to the presence of epoxy and hydroxide groups on its basal plane [34], as illustrated in Figure 2.…”