A novel microwave absorption material of Ni doped cryptomelane type manganese oxides

Guan, Hongtao; Wang, Yan; Dong, Chengjun; Chen, Gang; Xiao, Xuechun; Wang, Yude

doi:10.1016/j.ceramint.2014.12.153

Cited by 16 publications

(3 citation statements)

References 24 publications

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“…The absorption peak value reached À26.8 dB and an (reection loss exceeding À10 dB) of 3.7 GHz (14.3-18 GHz) with a thickness of 2 mm was achieved. 25 Even Wang et al has reported the maximum reection loss of MnO 2 nanoparticlesgraphene composite with a thickness of 2.0 mm being only À20.9 dB (ref. 26) and Gupta et al has explored the EMI shielding effectiveness in the frequency of Ku band of MnO 2 decorated graphene nanoribbons with the maximum shielding of À57 dB, 44 which is quite different from the performance of electromagnetic and the fabrication of our materials.…”

Section: Introductionmentioning

confidence: 99%

A facile hydrothermal synthesis of MnO₂ nanorod–reduced graphene oxide nanocomposites possessing excellent microwave absorption properties

et al. 2015

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Section: Introductionmentioning

confidence: 99%

A facile hydrothermal synthesis of MnO₂ nanorod–reduced graphene oxide nanocomposites possessing excellent microwave absorption properties

et al. 2015

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“…21 Subsequently, the spectra from X-ray photoelectron spectroscopy (XPS, ESCALAB 250Xi XPS system) of the MnO 2 nanoparticles were recorded to test the elements and values of the material, and then the XPS deconvoluted spectra for Mn 2p 3/2 at 641.9 eV, Mn 2p 1/2 at 653.9 eV, and Multiplet at 643.7 eV orbitals were obtained (Figure 1B,C); the results further confirmed the successful synthesis of MnO 2 . 22 The PAH-coated MnO 2 nanoparticles were stable in distilled deionized water with a homogeneous dispersion; the average size of the nanoparticles was about 15 nm (Figure 1D), the zeta potential was +27.8 ± 1.4 mV (Figure S1), and the polydispersity index (PDI) was 0.312.…”

Section: Resultsmentioning

confidence: 99%

MnO₂ Motor: A Prospective Cancer-Starving Therapy Promoter

Zhang

Qiu

Zhang

et al. 2018

ACS Appl. Mater. Interfaces

111

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Here, a tumor-targeted MnO motor nanosystem (designed as MG/HA) was constructed by the assembly of glucose oxidase (GOD), manganese dioxide (MnO), and glycoprotein CD44-targeting polymer hyaluronic acid (HA) to elevate cancer-starving therapy efficacy in solid tumor. Upon the specific uptake of MG/HA by CD44 overexpressed cancer cells, GOD catalyzed the oxidation of glucose into gluconic acid and hydrogen peroxide (HO) accompanying the consumption of oxygen (O). Meanwhile, MnO would react with HO and acid to generate O, which is in turn supplied to the glucose-depletion process, running like a loop. As a result, MnO is displayed as a motor to promote the rate of glucose depletion that contributed to the starving therapy. In contrast to G/HA, MG/HA could not only achieve effective glucose consumption to depress cancer progression, but also alleviate hypoxia and reduce the expression of Glut1 to inhibit the metabolism for further restraining the tumor aggressiveness and metastasis. The concept of MnO motor shows a promising prospect to overcome the restriction of the starving therapy.

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“…This is mainly attributed to the effective adjustment of the dielectric constant of MnO 2 with Ni doping. Additionally, Ni doping could induce a valence state change in the material, which is likely to induce a large number of vacancy defects to balance the valence state. − It is worth mentioning that oxygen vacancies are closely related to the microwave absorption characteristics in terms of improving electrical conductivity and enhancing polarization relaxation. , Compared with the MnO 2 particles and nanosheets, MnO 2 nanorods are conducive to construct a three-dimensional conductive network, thereby enhancing the conductance loss. A previous study has found that the incorporation of MnO 2 nanorods can tune the dielectric performance of Ti 3 C 2 T x MXene to show controllable microwave absorption .…”

Section: Introductionmentioning

confidence: 99%

Ni Doping in MnO₂/MXene (Ti₃C₂T_x) Composites to Modulate the Oxygen Vacancies for Boosting Microwave Absorption

Huang

et al. 2022

ACS Appl. Electron. Mater.

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Endowing composites with defects such as oxygen vacancies is an easy and effective strategy to determine the physical and chemical properties of nanomaterials. The influence of defects on microwave absorption remains a very open question. Herein, MnO2/Ti3C2T x MXene composites are self-assembled, demonstrating the boosting of microwave absorption through Ni doping in MnO2 to modulate the oxygen vacancies. The Ni-doped MnO2 (Ni–MnO2) nanorods with diameters of about 40 nm are dispersed on the surface and interlay of MXene. As expected, the reflection loss (RL) value and effective absorption bandwidth (EAB) of Ni–MnO2/MXene composites are −55.9 dB and 6.32 GHz, which are greatly enhanced over pure MnO2/MXene with −18.8 dB and 4.56 GHz. This excellent microwave absorption is mainly attributed to the optimized impedance matching in Ni–MnO2/MXene composites. In addition, the random distribution of MnO2 nanorods and MXene layers will form a conductive network, leading to the inducing microcurrent to form conduction losses. Moreover, interfacial polarization between layered MXene and Ni–MnO2 and dipole polarization induced by oxygen defects yield a strongly dielectric loss. Thus, our work provides a novel principle of modulation in oxygen vacancies to develop efficient MXene-based multicomponent composites for electromagnetic wave absorption.

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A novel microwave absorption material of Ni doped cryptomelane type manganese oxides

Cited by 16 publications

References 24 publications

A facile hydrothermal synthesis of MnO₂ nanorod–reduced graphene oxide nanocomposites possessing excellent microwave absorption properties

A facile hydrothermal synthesis of MnO₂ nanorod–reduced graphene oxide nanocomposites possessing excellent microwave absorption properties

MnO₂ Motor: A Prospective Cancer-Starving Therapy Promoter

Ni Doping in MnO₂/MXene (Ti₃C₂T_x) Composites to Modulate the Oxygen Vacancies for Boosting Microwave Absorption

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A novel microwave absorption material of Ni doped cryptomelane type manganese oxides

Cited by 16 publications

References 24 publications

A facile hydrothermal synthesis of MnO2 nanorod–reduced graphene oxide nanocomposites possessing excellent microwave absorption properties

A facile hydrothermal synthesis of MnO2 nanorod–reduced graphene oxide nanocomposites possessing excellent microwave absorption properties

MnO2 Motor: A Prospective Cancer-Starving Therapy Promoter

Ni Doping in MnO2/MXene (Ti3C2Tx) Composites to Modulate the Oxygen Vacancies for Boosting Microwave Absorption

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A facile hydrothermal synthesis of MnO₂ nanorod–reduced graphene oxide nanocomposites possessing excellent microwave absorption properties

A facile hydrothermal synthesis of MnO₂ nanorod–reduced graphene oxide nanocomposites possessing excellent microwave absorption properties

MnO₂ Motor: A Prospective Cancer-Starving Therapy Promoter

Ni Doping in MnO₂/MXene (Ti₃C₂T_x) Composites to Modulate the Oxygen Vacancies for Boosting Microwave Absorption