TY - JOUR
T1 - Oxygen-vacancies-rich TinO2n-1 quantum dots embedded Ti3CNTx/CNTs foam by HCl induced self-assembly and spontaneous oxidation towards strong and multiband microwave absorption
AU - Hu, Kexuan
AU - Xu, Yan
AU - Pan, Limei
AU - Li, Qian
AU - Wang, Yang
AU - Li, Quan
AU - Yang, Jian
N1 - Publisher Copyright:
© 2024
PY - 2024/10/15
Y1 - 2024/10/15
N2 - Ti3CNTx/TinO2n-1 foam and Ti3CNTx/CNTs/TinO2n-1 foam were prepared by hydrochloric acid (HCl) induced self-assembly and freeze-drying, during which oxygen-vacancies-rich TinO2n-1 quantum dots in situ grown on Ti3CNTx nanoflakes as a result of their slight and spontaneous oxidation. The well-developed pore structure, abundant interfaces, unique dangling bonds, defects and terminated groups on highly conductive Ti3CNTx nanoflakes, as well as the oxygen vacancies in TinO2n-1 quantum dots render the foams with superior impedance matching, intensive multiple reflection and dielectric loss. By immersing the foams into molten paraffin (absorber content: 4.2 wt%), excellent microwave absorption (MA) properties were achieved: an effective absorption bandwidth (EAB) of 5.2 GHz (1.55 mm) and a reflection loss (RL) of −81.3 dB (1.85 mm) for Ti3CNTx/TinO2n-1foam, and an EAB of 6.4 GHz and a RL of −54.3 dB (1.85 mm) for Ti3CNTx/CNTs/TinO2n-1 foam (15 wt% CNTs). Moderate addition of CNTs enhanced the conduction loss and polarization loss, leading to a larger EAB. When adjusting the thickness (1.2–5 mm), the EAB of Ti3CNTx/TinO2n-1 foam (14.7 GHz) and Ti3CNTx/CNTs/TinO2n-1 foam (15.3 GHz) both covered the C, X and Ku band. This work offers a simple and facile method for constructing Ti3CNTx-based foams as excellent MA materials.
AB - Ti3CNTx/TinO2n-1 foam and Ti3CNTx/CNTs/TinO2n-1 foam were prepared by hydrochloric acid (HCl) induced self-assembly and freeze-drying, during which oxygen-vacancies-rich TinO2n-1 quantum dots in situ grown on Ti3CNTx nanoflakes as a result of their slight and spontaneous oxidation. The well-developed pore structure, abundant interfaces, unique dangling bonds, defects and terminated groups on highly conductive Ti3CNTx nanoflakes, as well as the oxygen vacancies in TinO2n-1 quantum dots render the foams with superior impedance matching, intensive multiple reflection and dielectric loss. By immersing the foams into molten paraffin (absorber content: 4.2 wt%), excellent microwave absorption (MA) properties were achieved: an effective absorption bandwidth (EAB) of 5.2 GHz (1.55 mm) and a reflection loss (RL) of −81.3 dB (1.85 mm) for Ti3CNTx/TinO2n-1foam, and an EAB of 6.4 GHz and a RL of −54.3 dB (1.85 mm) for Ti3CNTx/CNTs/TinO2n-1 foam (15 wt% CNTs). Moderate addition of CNTs enhanced the conduction loss and polarization loss, leading to a larger EAB. When adjusting the thickness (1.2–5 mm), the EAB of Ti3CNTx/TinO2n-1 foam (14.7 GHz) and Ti3CNTx/CNTs/TinO2n-1 foam (15.3 GHz) both covered the C, X and Ku band. This work offers a simple and facile method for constructing Ti3CNTx-based foams as excellent MA materials.
KW - Microwave absorption property
KW - Oxygen vacancy
KW - Spontaneous oxidation
KW - TiCNT/CNTs/TiO foam
KW - TiO quantum dots
UR - http://www.scopus.com/inward/record.url?scp=85199383225&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2024.07.172
DO - 10.1016/j.ceramint.2024.07.172
M3 - 文章
AN - SCOPUS:85199383225
SN - 0272-8842
VL - 50
SP - 38096
EP - 38106
JO - Ceramics International
JF - Ceramics International
IS - 20
ER -