title: Layer-by-Layer Self-assembly of Co3O4Nanorod-Decorated MoS2Nanosheet-Based Nanocomposite toward High-Performance Ammonia Detection.
abstract: This article is the first demonstration of a molybdenum disulfide (MoS2)/tricobalt tetraoxide (Co3O4) nanocomposite film sensor toward NH3detection. The MoS2/Co3O4film sensor was fabricated on a substrate with interdigital electrodes via layer-by-layer self-assembly route. The surface morphology, nanostructure, and elemental composition of the MoS2/Co3O4samples were examined by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, energy-dispersive spectrometry, and X-ray photoelectron spectroscopy. The characterization results confirmed its successful preparation and rationality. The NH3sensing properties of the sensor for ultra-low-concentration detection were investigated at room temperature. The experimental results revealed that high sensitivity, good repeatability, stability, and selectivity and fast response/recovery characteristics were achieved by the sensor toward NH3. Moreover, the MoS2/Co3O4nanocomposite film sensor exhibited significant enhancement in ammonia-sensing properties in comparison with the MoS2and Co3O4counterparts. The underlying sensing mechanisms of the MoS2/Co3O4nanocomposite toward ammonia were ascribed to the layered nanostructure, synergistic effect, and heterojunction created at the interface of n-type MoS2and p-type Co3O4. The synthesized MoS2/Co3O4nanocomposite proved to be an excellent candidate for constructing high-performance ammonia sensor for various applications.
authors.affiliation: College of Information and Control Engineering, China University of Petroleum (East China) , Qingdao 266580, P.R. China.
authors.forename: Dongzhi
authors.identifier: http://orcid.org/0000-0001-9238-4176
authors.initials: D
authors.lastname: Zhang
authors.affiliation: College of Information and Control Engineering, China University of Petroleum (East China) , Qingdao 266580, P.R. China.
authors.forename: Chuanxing
authors.initials: C
authors.lastname: Jiang
authors.affiliation: State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments, Tsinghua University , Beijing 100084, P.R. China.
authors.forename: Peng
authors.initials: P
authors.lastname: Li
authors.affiliation: College of Information and Control Engineering, China University of Petroleum (East China) , Qingdao 266580, P.R. China.
authors.forename: Yan'e
authors.initials: Y
authors.lastname: Sun
keywords: ammonia sensor; heterojunction; layer-by-layer self-assembly; molybdenum disulfide; nanocomposite film; sensing mechanism