| With the development of modern chemical industry,air pollution from the industrial waste gas,especially toxic volatile gases such as ammonia,amide,sulfur-containing com-pounds,has greatly threaten the health of people and living environment.For this reason,it is very important to realize real-time and effective monitoring of composition and concentration of harmful gas in the atmosphere.Gas sensors are electronic devices which can detect the specific types the concentration of gases.To overcome the disadvantage of current gas sensors,such as high working temperature,low detection sensitivity,high production cost,new gas sensors with new materials and new processing technology have gained more and more atten-tion by researchers.In this work,we fistly employed new 2D nanomaterials MXenes（Ti3C2Tx）as a new type of sensory materials to design and prepare a new sensitive gas sensor.By using printed tem-plates and the suction filtering procedure,the MXenes were force-induced to form a sensor on the surface of paper substrates.Moreover,the surface functionalized modifications for Ti3C2Tx can effectively improve the gas detection sensitivity and selectivity of the paper chips,thus realizing the the prepartation of a low cost,high selective,high sensitive gas sensor.Ti3C2Tx layered porous structure has the larger specific surface area and a large number of reactive sites,by simple surface chemical reaction,it is easy to introduce functional groups such as carboxyl or amino groups.After the surface modification,the MXene chip can exhibit excellent sensitivity of ammonia gas as low as 43 ppb.Furthermore,because the corruption of meat could generate ammonia and amines gas,these MXene paper chip can be also used to evaluate the freshness of meat or fishes. |
