Complementary Metal–Oxide–Semiconductor Compatible 2D Layered Film‐Based Gas Sensors by Floating‐Gate Coupling Effect

Abstract

A 2D SnSe 2 layered film-based gas detector incorporating a floating-gate device coupled with metal interconnect wiring structures is proposed and demonstrated for the first time. Linear amplification can be readily implemented using a coupling ratio design, which refers to the capacitance ratio between the gate and device in the sense amplifier circuits. A sensitivity of 102 mV ppm −1 can be obtained using the 2D SnSe 2 layered film with a thickness of 10 nm. The 2D SnSe 2 layered film-based complementary metal-oxidesemiconductor (CMOS) gas detector features highly sensitive, wide, and adjustable dynamic ranges with a real-time response of the sub-ppm detection limit on NO 2 gas. In addition, the synthesis process of the SnSe 2 layered film can occur at a low temperature and be operated at room temperature. Furthermore, 3 × 3 gas detector arrays with peripheral circuits demonstrate the functionality of multiple gas detection simultaneously and 16 × 16 arrays with a decoder and other peripheral circuits are constructed and simulated, providing the spatial distribution of the gas concentration in a specific region. The performance of the proposed detector is comparable to that of the other state-of-the-art gas sensors.

Synergy of Active Sites and Charge Transfer in Branched WO3/W18O49 Heterostructures for Enhanced NO2 Sensing

“…excellent long-term stability and selectivity. The mechanism of improved gas sensing properties for WO3 / W 18 O 49 was proved by TPD, XPS, and EIS characterizations, which are ascribed to enhanced charge transfer and increased active sites in WO 3 /W 18 O 49 heterostructures. This work provides an exciting avenue for the development of WO 3 /W 18 O 49 heterostructures with potential applications in air quality testing.…”

“…1,2 Continuous exposure to parts per million (ppm) concentration of NO 2 in air can cause respiratory infections, chronic bronchitis, and even lead to death. 3 According to the United States Environmental Protection Agency, the annual average of the NO 2 standard is 53 ppb. 4 Therefore, it is imperative to develop reliable and highly sensitive gas sensors for low concentration of NO 2 detection.…”

“…With the rapid development of industrialization, vehicle exhaust emission and fossil fuel combustion have aggravated the deterioration of air quality. Nitrogen dioxide (NO 2 ) is one of the main toxic and hazardous air pollutants, which can easily result in the formation of acid rain and photochemical smog. , Continuous exposure to parts per million (ppm) concentration of NO 2 in air can cause respiratory infections, chronic bronchitis, and even lead to death . According to the United States Environmental Protection Agency, the annual average of the NO 2 standard is 53 ppb .…”

Adsorption Behavior of Dissolved Gas Molecules in Transformer Oil on Rh Modified GeSe Monolayer

“…As a new gas monitoring technology, gas sensors are applied to dissolved gases in transformer oil decoration, industrial production, exhaust emissions, and other fields to monitor various toxic and harmful gases. , The gas sensor can intuitively display the information on the type, concentration, and flow rate of the target gas as the corresponding resistance or voltage value of the gas sensing material after the physical and chemical reaction with the measured gas. , According to the change of resistance or voltage caused by the physical and chemical reaction between the gas sensing material and the measured gas, the corresponding actual situation can be obtained by calculation so as to achieve the effect of monitoring, control, and early warning. Therefore, as the core component of gas sensors, the development of gas sensing materials is the key means to improving the performance, reducing the cost, and upgrading the technology of gas sensors.…”