TY - JOUR
T1 - Enhanced microwave absorbing properties of carbonyl iron-doped Ag/ordered mesoporous carbon nanocomposites
AU - Wu, Hongjing
AU - Wang, Liuding
AU - Wang, Yiming
AU - Guo, Shaoli
AU - Shen, Zhongyuan
PY - 2012/4/15
Y1 - 2012/4/15
N2 - Microwave absorbing materials carbonyl iron (CI)-doped Ag/ordered mesoporous carbon (OMC) paraffin wax composites were prepared by colloidal deposition and impregnation methods, and their electromagnetic and microwave absorbing properties were investigated in the frequency ranging from 2 to 18 GHz. The microstructures and chemical compositions of the Ag/OMC and Ag/OMC-CI paraffin wax composites were characterized by TEM, XRD, XPS, SEM and EDS, respectively. The complex permittivity of the paraffin wax composites show dual resonance behavior, resulting from the multi-interfaces among Ag nanoparticles, OMC nanorods, CI and paraffin wax. The magnetic loss was mainly caused by natural resonance and eddy current loss, respectively. The minimum reflection loss (RL) value of Ag/OMC-CI was below -10 dB at 12 GHz, which were superior to those of OMC-CI and Ag/OMC. This phenomenon is attributed to the enhancement of dielectric polarization and magnetic loss.
AB - Microwave absorbing materials carbonyl iron (CI)-doped Ag/ordered mesoporous carbon (OMC) paraffin wax composites were prepared by colloidal deposition and impregnation methods, and their electromagnetic and microwave absorbing properties were investigated in the frequency ranging from 2 to 18 GHz. The microstructures and chemical compositions of the Ag/OMC and Ag/OMC-CI paraffin wax composites were characterized by TEM, XRD, XPS, SEM and EDS, respectively. The complex permittivity of the paraffin wax composites show dual resonance behavior, resulting from the multi-interfaces among Ag nanoparticles, OMC nanorods, CI and paraffin wax. The magnetic loss was mainly caused by natural resonance and eddy current loss, respectively. The minimum reflection loss (RL) value of Ag/OMC-CI was below -10 dB at 12 GHz, which were superior to those of OMC-CI and Ag/OMC. This phenomenon is attributed to the enhancement of dielectric polarization and magnetic loss.
KW - Ag nanoparticles
KW - Dielectric loss
KW - Mesoporous carbon materials
KW - Microwave absorption
UR - http://www.scopus.com/inward/record.url?scp=84862824357&partnerID=8YFLogxK
U2 - 10.1016/j.mseb.2012.02.008
DO - 10.1016/j.mseb.2012.02.008
M3 - 文章
AN - SCOPUS:84862824357
SN - 0921-5107
VL - 177
SP - 476
EP - 482
JO - Materials Science and Engineering: B
JF - Materials Science and Engineering: B
IS - 6
ER -