氧化石墨烯GHz介电常数及其在无线湿度传感中的应用
Graphene oxide dielectric permittivity at GHz and its applications for wireless humidity sensing
摘要：
氧化石墨烯的相对介电常数，其实部和虚部，已被测量在各种湿度条件下在GHz。它表明，相对介电常数随着湿度的增加而增加，由于水分的吸收。氧化石墨烯的这种电特性被用于通过用氧化石墨烯层涂覆印刷的石墨烯天线来创建无电池无线射频识别（RFID）湿度传感器。这种氧化石墨烯/石墨烯天线的谐振频率以及反向散射相位变得对周围湿度敏感，并且可以由RFID读取器检测到。这使得无电池无线监测本地湿度与数字识别附加到任何位置或项目，并铺平了道路，为物联网应用的低成本高效传感器。
英文摘要：
Graphene oxide relative dielectric permittivity, both its real and imaginary parts, have been measured under various humidity conditions at GHz. It is demonstrated that the relative dielectric permittivity increases with increasing humidity due to water uptake. This electrical property of graphene oxide was used to create a battery-free wireless radio-frequency identification (RFID) humidity sensor by coating printed graphene antenna with the graphene oxide layer. The resonance frequency as well as the backscattering phase of such graphene oxide/graphene antenna become sensitive to the surrounding humidity and can be detected by the RFID reader. This enables batteryless wireless monitoring of the local humidity with digital identification attached to any location or item and paves the way for low-cost efficient sensors for Internet of Things applications.
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