The present work combines polypyrrole with cobalt molybdenum oxide using an in situ surface growth method to adjust impedance matching and explore the microwave absorption performance of the composite material.The com...The present work combines polypyrrole with cobalt molybdenum oxide using an in situ surface growth method to adjust impedance matching and explore the microwave absorption performance of the composite material.The complex dielectric constant and magnetic permeability of the samples are measured in the frequency range of 2 to 18 GHz using a vector network analyzer,and their reflection loss(RL)value is investigated.The results show that the obtained PPy/Co_(x)Mo_(y)O_(z)composite exhibits excellent absorption performance at 17.68 GHz under a matching thickness of 2.0 mm,with an RL_(min)of-46.02 dB and an effective absorption bandwidth of 4.08 GHz.The excellent absorption performance can be attributed to the combined effect of multion loss mechanisms,including conduction loss,interface polarization,dipole polarization and eddy current loss.展开更多
Molybdenum oxide nanoparticles(NPs) with tunable plasmonic resonance in the near-infrared region display superior semiconducting features and photothermal properties, which are highly related to the crystalline and de...Molybdenum oxide nanoparticles(NPs) with tunable plasmonic resonance in the near-infrared region display superior semiconducting features and photothermal properties, which are highly related to the crystalline and defective structures such as oxygen deficiencies. However,fundamental understanding on the structure-function relationship between crystalline/defective structures and photothermal properties is still unclear. To address this, herein,we have developed an "in-situ confined oxidation-reduction"strategy to regulate the defect features of molybdenum oxide NPs in the dual-mesoporous silica nanoreactor. Especially, the effects of crystalline structure/oxygen defects of molybdenum oxides on the photothermal performances were investigated by facilely tuning the amount of molybdenum resource and the reduction temperature. As a photothermal nanoagent, the optimal defective molybdenum oxide NPs encapsulated in PEGylated porous silica nanoreactor(designated as MoO_(3)@PPSNs) exhibit excellent biological stability and strong localized surface plasmon resonance effect in nearinfrared absorption range with the highest photothermal conversion efficiency up to 78.7% under 808 nm laser irradiation. More importantly, the remarkable photothermal effects of MoO_(3)@PPSNs were comprehensively demonstrated both in vitro and in vivo. Consequently, we envision that the plasmonic MoO_(3)NPs in a biocompatible porous silica nanoreactor could be used as an efficient photothermal therapy agent for photothermal ablation of tumors.展开更多
基金supported by the National Natural Science Foundation of China(22165032)
文摘The present work combines polypyrrole with cobalt molybdenum oxide using an in situ surface growth method to adjust impedance matching and explore the microwave absorption performance of the composite material.The complex dielectric constant and magnetic permeability of the samples are measured in the frequency range of 2 to 18 GHz using a vector network analyzer,and their reflection loss(RL)value is investigated.The results show that the obtained PPy/Co_(x)Mo_(y)O_(z)composite exhibits excellent absorption performance at 17.68 GHz under a matching thickness of 2.0 mm,with an RL_(min)of-46.02 dB and an effective absorption bandwidth of 4.08 GHz.The excellent absorption performance can be attributed to the combined effect of multion loss mechanisms,including conduction loss,interface polarization,dipole polarization and eddy current loss.
基金supported by the National Key Research and Development Program of China (2016YFA0203700)the National Natural Science Foundation of China (51672083, 51962022 and 52072124)+4 种基金the Natural Science Foundation of Shanghai (20ZR1414900)the Program of Shanghai Academic/Technology Research Leader (18XD1401400)the Leading Talents in Shanghai in 2018the Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learningthe 111 Project (B14018)。
文摘Molybdenum oxide nanoparticles(NPs) with tunable plasmonic resonance in the near-infrared region display superior semiconducting features and photothermal properties, which are highly related to the crystalline and defective structures such as oxygen deficiencies. However,fundamental understanding on the structure-function relationship between crystalline/defective structures and photothermal properties is still unclear. To address this, herein,we have developed an "in-situ confined oxidation-reduction"strategy to regulate the defect features of molybdenum oxide NPs in the dual-mesoporous silica nanoreactor. Especially, the effects of crystalline structure/oxygen defects of molybdenum oxides on the photothermal performances were investigated by facilely tuning the amount of molybdenum resource and the reduction temperature. As a photothermal nanoagent, the optimal defective molybdenum oxide NPs encapsulated in PEGylated porous silica nanoreactor(designated as MoO_(3)@PPSNs) exhibit excellent biological stability and strong localized surface plasmon resonance effect in nearinfrared absorption range with the highest photothermal conversion efficiency up to 78.7% under 808 nm laser irradiation. More importantly, the remarkable photothermal effects of MoO_(3)@PPSNs were comprehensively demonstrated both in vitro and in vivo. Consequently, we envision that the plasmonic MoO_(3)NPs in a biocompatible porous silica nanoreactor could be used as an efficient photothermal therapy agent for photothermal ablation of tumors.
