The use of peanut shells as a bio-template to prepare K-doped InO porous sheets for chlorine detection.

Chlorine (Cl) is highly toxic and pungent, and can cause irreversible harm to humans even at low concentrations. Therefore, it is significant to develop a sensor that is highly sensitive to trace amounts of Cl leakage. In this work, inexpensive peanut shells are used as a biological template to prepare K-doped indium oxide (K-InO) porous sheets through a simple three-step process. The characterization results reveal the porous sheet microstructure of the prepared K-InO derived from the peanut shell bio-template, and the obtained material possesses rich oxygen vacancies and a high specific surface area. Gas-sensing tests demonstrate that the K-InO porous sheet sensor exhibits excellent sensitivity to low concentrations of Cl.