Facile synthesis of ZnFe2O4/reduced graphene oxide nanohybrids for enhanced microwave absorption properties

Facile synthesis of the N-doped graphene/nickel oxide with enhanced electrochemical performance for rechargeable lithium-ion batteries

“…2, the XRD patterns of GO, NGr-NiO-M and NGr-NiO can be observed, respectively. For GO, the diffraction peak appear at 2q ¼ 10.9 which is typically corresponding to the (001) plane with an expanding interlayer spacing of about 0.94 nm for the reason that the decoration of oxygenfunctional groups on the surface of GO [38]. The diffraction peaks located at 2q ¼ 37 , 43 , 63 , 75 and 79 as shown in Fig.…”

“…1(bec) correspond to the (111), (200), (220), (311) and (222) planes of the NiO (JCPDS 47-1049), respectively, which demonstrate the nuclear and crystallization of NiO during the fabrication process [15,39]. And the absence of the diffraction peak of GO indicates the reduction of GO during the hydrothermal process [38,40]. There is no diffraction peak of graphene at about 2q ¼ 25 can be observed which is indicating rare restacking of reduced GO.…”

Zn substitution NiFe2O4 nanoparticles with enhanced conductivity as high-performances electrodes for lithium ion batteries

“…The band at ∼650 cm −1 for ZnFe 2 O 4 corresponds to motion of oxygen in the ZnO 4 tetrahedral. Previous papers also offer the same explanation [48][49][50][51][52][53]. Upon with Ni + substitution the high frequency band ranges from ~630 to ~670 due to the change in the environment of the tetrahedral.…”

“…Normal spinel structure ZnFe 2 O 4 permits five active Raman modes (A 1g + E g +3T 2g ) [48,49]. Usually, wave numbers above 600 cm -1 mostly corresponds to the motion of oxygen in tetrahedral AO 4 groups that are of the A 1g type, while the low frequency phonon modes are related to metal ion involved in octahedral sites (BO 6 ) [50,51]. The band at ∼650 cm −1 for ZnFe 2 O 4 corresponds to motion of oxygen in the ZnO 4 tetrahedral.…”

Electromagnetic wave absorption properties of NiCoP alloy nanoparticles decorated on reduced graphene oxide nanosheets

“…Thus, reflection loss of the three samples can be considered as the results of the combination of dielectric loss and magnetic loss. Furthermore, the addition of graphene has many merits to improve the microwave absorption properties: Firstly, the addition of graphene can effectively reduce the density of absorbing materials because graphene has much smaller density excellent mechanical properties than the traditional dense ferrite [31]. Secondly, the reduction of GO to RGO still leaves behind a certain amount of defects and oxygen groups.…”