Abstract
AbstractLignin, an abundant and environmentally friendly renewable polymer, was used to attain the carbonized lignin in current study. Then, a highly humidity sensitive composite composite film was prepared by carbonized lignin (CL) applied as the conductive particles and sodium alginate (SA). The repeatability, hysteresis, stability and response‐recovery of the CL/SA composite film sensor were investigated in the range of 11 to 97 % relative humidity at room temperature. The results showed the maximum responsivity of CL/SA composite film is 502,895.40 % under 97 % relative humidity. In addition, CL/SA composite film can be used as humidity sensors with ultrahigh sensitivity, low hysteresis, and stable repeatability in a wide relative humidity range of 11–97 %. Finally, the humidity mechanism of the CL/SA sensor and its monitoring application in human respiration were analyzed. The research revealed that CL/SA composite is an excellent humidity sensitive material.
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