Humidity sensitive properties of K-doped mesoporous silica SBA-15

Humidity sensors based on K-doped mesoporous silica SBA-15 were prepared and characterized by XRD, SEM, TEM and N2 adsorption-desorption isotherms. The humidity sensing test results show that KCl doping improves the sensing characteristic of humidity sensors. The optimal result is obtained via sample 50 wt% KCl-doped SBA-15, which exhibits an excellent linearity in the whole humidity range of 11%-95%. It also shows satisfactory reversibility and fast responses to the environmental moisture. The investigation of the humidity sensitive characteristics of the K-doped SBA-15 sensor shows that this material could have good prospects of application in humidity sensor.

Graphical AbstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► A simple and effective route for the synthesis of a highly efficient humidity sensing material. ► The composite presents good stability and has undestroyed ordered mesoporous structure. ► This sensor has a very good response and recovery property.