title: Enhanced sensitivity and stability of room-temperature NH₃ sensors using core-shell CeO₂ nanoparticles@cross-linked PANI with p-n heterojunctions.
abstract: We report a room-temperature NH3 gas sensor with high response and great long-term stability, including CeO2 NPs conformally coated by cross-linked PANI hydrogel. Such core-shell nanocomposites were prepared by in situ polymerization with different weight ratios of CeO2 NPs and aniline. At room temperature, the nanohybrids showed enhanced response (6.5 to 50 ppm of NH3), which could be attributed to p-n junctions formed by the intimate contact between these two materials. Moreover, the stability was discussed in terms of phytic acid working as a gelator, which helped the PANI sheath accommodate itself and enhance the mechanical strength and chemical stability of the sensors by avoiding "swelling effect" in high relative humidity. The sensors maintained its sensing characteristic (response of ca. 6.5 to 50 ppm of NH3) in 15 days. Herein, the obtained results could help to accelerate the development of ammonia gas sensor.
authors.affiliation: Pen-Tung Sah Institute of Micro-Nano Science and Technology, Xiamen University , Xiamen, China.
authors.forename: Lingling
authors.initials: L
authors.lastname: Wang
authors.forename: Hui
authors.initials: H
authors.lastname: Huang
authors.forename: Songhua
authors.initials: S
authors.lastname: Xiao
authors.forename: Daoping
authors.initials: D
authors.lastname: Cai
authors.forename: Yuan
authors.initials: Y
authors.lastname: Liu
authors.forename: Bin
authors.initials: B
authors.lastname: Liu
authors.forename: Dandan
authors.initials: D
authors.lastname: Wang
authors.forename: Chenxia
authors.initials: C
authors.lastname: Wang
authors.forename: Han
authors.initials: H
authors.lastname: Li
authors.forename: Yanrong
authors.initials: Y
authors.lastname: Wang
authors.forename: Qiuhong
authors.initials: Q
authors.lastname: Li
authors.forename: Taihong
authors.initials: T
authors.lastname: Wang