Ethanol
sensors with ultrafast response and high sensitivity have
attracted much attention to be applied to daily industrial production
processes. In this work, graphene oxide–aniline (GOA) sensors
are proposed to meet the requirements of detecting ethanol concentration.
Graphene oxide is an outstanding material that has excellent electrical
and thermal conductivity, large specific surface area, and high carrier
mobility. Because of its special bonding reactions, GOA has advantages
of good dispersibility, good electrical conductivity, insolubility
in water, and strong plasticity. When testing ethanol concentration
with sensors, there will be a lag time, which determines the sensitivity
of the sensors. To the best of our knowledge, the GOA sensors in this
work have the fastest response time, which is only 27 ms. The GOA
ethanol sensors show a good ethanol sensing performance, including
excellent sensitivity, cycle stability, and long-term stability.
Atomically multilayered two-dimensional transition-metal carbides have abundant interfaces, and are very promising as outstanding electromagnetic absorbing materials at thin thickness. Here, a Ti3C2Tx MXene was prepared by hydrofluoric acid etching method, and has typical multilayered morphology with stacks of nanosheets. The microwave dielectric behaviours of the Ti3C2Tx with efficient microwave absorption were investigated. The Ti3C2Tx presents good impedance matching, achieved with effective absorption bandwidth covering from 12.4 GHz to 17.1 GHz, with thickness of only 1.5 mm, which nearly covers the whole Ku band. The microwave absorption performance was adjusted, and the Ti3C2Tx has a minimum reflection loss of −34.4 dB at 12 GHz at only 1.7 mm. This study demonstrates the real potential of Ti3C2Tx MXene materials as electromagnetic wave thin broadband absorbers.
Circulators, as passive non-reciprocal devices, have excellent potential for application in wireless communication and radar-signal processing. However, the construction of terahertz (THz)-frequency circulators is extremely difficult. Here, an electromagnetic matching model for metamaterials is proposed to support the design of a THz circulator with a wider operating bandwidth. The resulting circulator can work without an external magnetic field in the THz frequency range. The best isolation of this THz circulator is 20.9 dB, and its maximum directionality is 16.6 dB. These results validate a new method for the design of metamaterial-based THz devices.
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