Fabricating Flexibly Resistive Humidity Sensors with Ultra‐high Sensitivity Using Carbonized Lignin and Sodium Alginate | Zendy

Yun Xiaojing | Zendy; Zhang Qingtong | Zendy; Luo Bin | Zendy; Jiang Hongrui | Zendy; Chen Changzhou | Zendy; Wang Shuangfei | Zendy; Min Douyong | Zendy

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Fabricating Flexibly Resistive Humidity Sensors with Ultra‐high Sensitivity Using Carbonized Lignin and Sodium Alginate

Author(s) -

Yun Xiaojing,

Zhang Qingtong,

Luo Bin,

Jiang Hongrui,

Chen Changzhou,

Wang Shuangfei,

Min Douyong

Publication year - 2020

Publication title -

electroanalysis

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.574

H-Index - 128

eISSN - 1521-4109

pISSN - 1040-0397

DOI - 10.1002/elan.202060128

Subject(s) - relative humidity , materials science , composite number , humidity , repeatability , carbonization , composite material , hysteresis , chemical engineering , chemistry , chromatography , scanning electron microscope , physics , engineering , quantum mechanics , thermodynamics

Lignin, 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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