Hysteresis Behaviour of Sensitivity In CH4 Detection in Air Using SnO2 with Pd as Sensitizing Additive

Abstract

Kepekaan SnO₂ dengan Pd sebagai bahan tambah menunjukkan sifat histerisis apabila pengukuran dilakukan pada suhu operasi menaik berbanding dengan pengukuran yang dilakukan pada suhu menyusut. Kepekaan sampel-sampel dikira bagi beberapa suhu operasi dari 200°C sehingga 430°C dan didapati kepekaan meningkat apabila pengukuran yang dilakukan pada suhu menurun. Histerisis yang diamati dalam kepekaan ini dibincangkan dalam konteks jenis spesies oksigen yang terjerap di atas permukaan SnO₂. Kata kunci: histerisis; kepekatan; bahan tambah pemekaan; konduktans; metana The sensitivity of SnO₂ with Pd as an additive showed a hysteresis behaviour when measurement was carried out as the operating temperature is increasing compared to measurement with decreasing temperature. The sensitivities of the samples that were calculated at the various operating temperatures from 200°C to 430°C were found to be higher when measuring with decreasing temperature. This observed hysteresis in sensitivity is discussed in terms of the type of oxygen species adsorbed on the SnO₂ surface. Key words: hysterisis; sensitivity; sensitizing additive; conductance; methane