Hydrothermally synthesized hydroxyapatite cellulose composites thick films as ammonia gas sensor

This paper reports the successful synthesis of hydroxyapatite nanorods on cellulose nanofibrils surface by hydrothermal method. The temperature conditions here used are 120, 150, and 180 degrees C. The synthesized composites are characterized by various techniques, viz., XRD, FTIR, BET, TGA, and SEM analysis, to find the materials' physiochemical properties. The screen-printed thick films of synthesized samples underwent ammonia gas sensing by using two-probe electrode setup. The sample synthesized at 150 degrees C shows elevated gas sensing characteristics compared to rest composites. This sample's operating temperature is 25 degrees C with a good sensitivity factor, i.e., 893%. The response/recovery time for the present sensor was observed to be 120 s and 30 s. This sensor shows efficient ammonia gas sensing characteristics compared to reported materials in the literature.

Automated summary

This study successfully synthesized hydroxyapatite nanorods on cellulose nanofibrils surface using hydrothermal method, with the sample synthesized at 150 degrees C showing the best gas sensing characteristics, including quick response and recovery times.