Abstract
In this study, a polyethyleneimine (PEI)-functionalized carbon nanotube (CNT) sensor was fabricated for carbon dioxide detection at room temperature. Uniform CNT thin films prepared using a filtration method were used as resistive networks. PEI, which contains amino groups, can effectively react with CO2 gas by forming carbamates at room temperatures. The morphology of the sensor was observed, and the properties were analyzed by scanning electron microscope (SEM), Raman spectroscopy, and fourier transform infrared (FT-IR) spectroscopy. When exposed to CO2 gas, the fabricated sensor exhibited better sensitivity than the pristine CNT sensor at room temperature. Both the repeatability and selectivity of the sensor were studied.
Highlights
Carbon dioxide is a colorless and odorless gas, contributing to the greenhouse effect; it is a major cause of global warming [1,2,3,4]
Film is essentially a porous structure composed of randomly entangled carbon nanotube (CNT)
The filtration method can ensure the uniformity of CNT deposition
Summary
Carbon dioxide is a colorless and odorless gas, contributing to the greenhouse effect; it is a major cause of global warming [1,2,3,4]. Reliable and low-cost CO2 gas sensing is of great significance. Since CO2 is an unreactive gas, operating gas sensors at room temperature is challenging [5,6]. Diverse sensing principles and/or materials for detecting. CO2 gas have been reported, including nondispersive infrared (NDIR), metal oxides, polymers, and nanomaterials. Each has their own strengths and weaknesses. Most common sensors are NDIR sensors and metal oxide sensors; IR sensors have disadvantages such as bulkiness of transducers and high power consumption during operation [7,8,9,10]
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