Pore-regulation in 2D biochar-based flakes towards wideband microwave absorption

Urea-Assisted Green Synthesis of CeO2 Nanoparticles/Porous Carbon Composites for Microwave Absorption

“…As shown in Figure b, the XPS spectrum of C3-500 is exhibited, which shows the presence of C, N, C, and O elements in the sample, which is in agreement with the analytical results of XRD. The XPS spectrogram of C 1s of the C3-500 sample (Figure c) can be fitted with the four peaks at 284.8, 285.6, 286.5, and 289.0 eV, corresponding to C–C/CC, CN, C–N/C–O, and O–CO, respectively. − Among them, the formation of C–O and CO bonds is due to the pyrolysis process of cellulose and lignin in bamboo powders . As illustrated in Figure d, the XPS spectra of N 1s of C3-500 samples showed three peaks at 400.4, 398.0, and 401.5 eV corresponding to pyridine nitrogen, pyrrole nitrogen, and graphite nitrogen, respectively. , These results confirmed the successful doping of N and O in porous carbon, leading to the generation of dipole polarization and thus an increase in the dielectric loss.…”

“…The CeO 2 NPs are evenly distributed over the porous carbon, as seen in Figure 2a, which is following 30−32 Among them, the formation of C−O and C�O bonds is due to the pyrolysis process of cellulose and lignin in bamboo powders. 33 As illustrated in Figure 3d, the XPS spectra of N 1s of C3-500 samples showed three peaks at 400.4, 398.0, and 401.5 eV corresponding to pyridine nitrogen, pyrrole nitrogen, and graphite nitrogen, respectively. 34,35 These results confirmed the successful doping of N and O in porous carbon, leading to the generation of dipole polarization and thus an increase in the dielectric loss.…”

In situ fabrication of Fe3C nanoparticles and porous-carbon composites as high-performance electromagnetic wave absorber

“…Based on the coexistence of the dielectric material PIC and magnetic nanoparticles Fe 3 C and FeCo alloy, dissipation of incident EMW mainly includes dielectric loss and magnetic loss. 42,43 The dielectric loss is manifested in dipole polarization, defect polarization and interface polarization. First, there are residual oxygen and nitrogen atoms on the surface of PIC during carbonization, which changes the distribution of electric clouds to the formation of Electric dipoles to distinct EWM.…”

Modification and Application of Bamboo-Based Materials: A Review—Part II: Application of Bamboo-Based Materials

“…PGC-6 displayed a minimum reflection loss (RL) value of 15.8 dB, with an absorption bandwidth extending up to 3.8 GHz at a thickness of 1.70 mm. This research presents a viable avenue for the resourceful utilization of agricultural and forestry waste materials [155]. Sun et al, using their advanced bamboo splitting technology, succeeded in obtaining bamboo pieces with uniformly distributed pore size.…”