Two-dimensional (2D) nanostructures are highly attractive for fabricating nanodevices due to their high surface-to-volume ratio and good compatibility with device design. In recent years 2D nanostructures of various materials including metal oxides, graphene, metal dichalcogenides, phosphorene, BN and MXenes, have demonstrated significant potential for gas sensors. This review aims to provide the most recent advancements in utilization of various 2D nanomaterials for gas sensing. The common methods for the preparation of 2D nanostructures are briefly summarized first. The focus is then placed on the sensing performances provided by devices integrating 2D nanostructures. Strategies for optimizing the sensing features are also discussed. By combining both the experimental results and the theoretical studies available, structure-properties correlations are discussed. The conclusion gives some perspectives on the open challenges and future prospects for engineering advanced 2D nanostructures for high-performance gas sensors devices.

Two-Dimensional Nanostructured Materials for Gas Sensing

The adsorption of CO and NO on the MoS2 monolayer doped with Au, Pt, Pd, or Ni: A first-principles study

Fabrication and characterisation of Al–7Si–0.35Mg/fly ash metal matrix composites processed by different stir casting routes

Nanotechnology has stimulated revolutionary advances in many scientific and industrial fields, particularly in energetic materials. Powder mixing is the simplest and most traditional method to prepare nanoenergetic composites, and preliminary findings have shown that these composites perform more effectively than their micro- or macro-sized counterparts in terms of energy release, ignition, and combustion. Powder mixing technology represents only the minimum capability of nanotechnology to boost the development of energetic material research, and it has intrinsic limitations, namely, random distribution of fuel and oxidizer particles, inevitable fuel pre-oxidation, and non-intimate contact between reactants. As an alternative, nanostructured energetic composites can be prepared through a delicately designed process. These composites outperform powder-mixed nanocomposites in numerous ways; therefore, we comprehensively discuss the preparation strategies adopted for nanostructured energetic composites and t...

Nanostructured energetic composites: synthesis, ignition/combustion modeling, and applications.

This article is the first demonstration of a molybdenum disulfide (MoS2)/tricobalt tetraoxide (Co3O4) nanocomposite film sensor toward NH3 detection. The MoS2/Co3O4 film 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/Co3O4 samples 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 NH3 sensing 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/Co3O4 nanocomposite film sensor exhibited significant enhancement in ammonia...

Layer-by-Layer Self-assembly of Co3O4 Nanorod-Decorated MoS2 Nanosheet-Based Nanocomposite toward High-Performance Ammonia Detection.

Adsorption of NO2, NH3 on monolayer MoS2 doped with Al, Si, and P: A first-principles study

Damping properties of aluminum matrix–fly ash composites

Transient liquid phase bonding of Inconel718 superalloy was carried out using a commercial Ni–Cr–Si–B amorphous interlayer The interfacial microstructure of Inconel718 joints was analyzed by a scanning electron microscope and a transmission electron microscope In particular, the effects of post-weld heat treatment on the interfacial microstructure and joining properties of Inconel718 joints were investigated in detail The results showed that the precipitation of second phases in joints induced by post-weld heat treatment were beneficial to the improvement of joint properties A tensile strength of 1130 MPa with an elongation percentage of 7% was achieved for a sample bonded at 1050 °C/60 min+1180 °C/60 min followed by the post-weld heat treatment

J. Cao

Papers

Adsorption of NO2, NH3 on monolayer MoS2 doped with Al, Si, and P: A first-principles study

Damping properties of aluminum matrix–fly ash composites

Effects of post-weld heat treatment on microstructure and mechanical properties of TLP bonded Inconel718 superalloy

Microstructure and fracture properties of reaction-assisted diffusion bonding of TiAl intermetallic with Al/Ni multilayer foils

Microstructure evolution and reaction mechanism during reactive joining of TiAl intermetallic to TiC cermet using Ti-Al-C-Ni interlayer