title: Electrical conductivity of p-type BiOCl nanosheets.
abstract: High quality BiOCl nanosheets were fabricated using facile, room temperature hydrolysis of Bi(NO3)3 and HCl. The resulting nanosheets had dimensions of 500 nm with the exposed {001} facet. The band gap of the nanosheets was found to be 3.34 eV with conduction and valence band edges at -3.63 eV and -6.97 eV with respect to vacuum, respectively. The electrical conductivity of drop-cast BiOCl nanosheets was measured between aluminum patterned electrodes as a function of temperature and oxygen partial pressure (pO2). The activation energy for conduction in BiOCl was found to be 862 meV in the temperature range of 300-425 K and below 1000 mbar. The electrical conductivity varied with pO2, indicating σ ∝ pO2(1/4.05) and σ ∝ pO2(1/32) for low and sub atmospheric pressures, respectively. A prototypical device for low temperature (425 K) O2 sensing was demonstrated.
authors.affiliation: Department of Mechanical Engineering and Materials Science, Washington University in St. Louis, St. Louis, MO 63130, USA. parag.banerjee@wustl.edu.
authors.forename: Yoon
authors.initials: Y
authors.lastname: Myung
authors.forename: Fei
authors.initials: F
authors.lastname: Wu
authors.forename: Sriya
authors.initials: S
authors.lastname: Banerjee
authors.forename: Jeunghee
authors.initials: J
authors.lastname: Park
authors.forename: Parag
authors.initials: P
authors.lastname: Banerjee