A Room-Temperature CNT/Fe3O4 Based Passive Wireless Gas Sensor

Abstract

A carbon nanotube/Fe3O4 thin film-based wireless passive gas sensor with better performance is proposed. The sensitive test mechanism of LC (Inductance and capacitance resonant) wireless sensors is analyzed and the reason for choosing Fe3O4 as a gas sensing material is explained. The design and fabrication process of the sensor and the testing method are introduced. Experimental results reveal that the proposed carbon nanotube (CNT)/Fe3O4 based sensor performs well on sensing ammonia (NH3) at room temperature. The sensor exhibits not only an excellent response, good selectivity, and fast response and recovery times at room temperature, but is also characterized by good repeatability and low cost. The results for the wireless gas sensor’s performance for different NH3 gas concentrations are presented. The developed device is promising for the establishment of wireless gas sensors in harsh environments.

Finite Element Model and Size Dependent Stability Analysis of Boron Nitride and Silicon Carbide Nanowires/Nanotubes

“…Recently, with a rise in the popularity of renewable energy for transportation and electronics, studies about carbon nanotube usage for improving the durability, lifespan, and capacity of batteries have started to receive considerable attention [17][18][19][20][21][22][23][24][25][26][27][28]. Further, in the last decade, studies about the usage of CNT in one of the most e ective usage areas, gas sensors, have soared [29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45]. The discovery of CNTs may be a revolutionary point for many application areas such as processor technology, biotechnology, gas/chemical sensors, aerospace technology, etc.…”

Improving Gas-Sensing Performance Based on MOS Nanomaterials: A Review

“…This leads to the change in the reaction rate by influencing various reaction sites on the surface and accelerates the overall response. Carbon nanotubes and their products have excellent electrical conductivity and mechanical properties, but they cannot detect specific gases [131]. However, the composites of carbon nanotubes with metal and metal oxide not only inherit the unique properties of carbon nanotubes but also gain the ability to recognize some gases.…”

Special Issue “Advanced Nanomaterials Based Gas Sensors”

“…When NH 3 is absorbed on the NPs, which act as an absorption site, it causes a modulation of the depletion layer that is reflected as a more relevant resistance change. A similar approach based on a mixture of CNTs and Fe 2 O 3 for ammonia detection is proposed in [6] but using a completely different transduction system. In this case, a wireless passive approach is proposed.…”