Firstly, ZnO nanorods were prepared by a relatively simple method, and then self-sacrificed water bath heating method to generate commonly used porous ZIF-8 firmly attached the surface. The successful synthesis of synthetic composites was demonstrated with various detection methods. gas-sensing results show that ZIF-8-coated core-shell structure exhibits better response than raw because increas...

We demonstrate the versatility of a silicon nitride grated waveguide optical cavity as compact integrated optical sensors for (bulk) concentration detection, label-free protein sensing, and – with an integrated microbridge suspended above it – gas sensing. A grated waveguide (GWG), which is a waveguide with a finite-length grated section, acts as an optical resonator, showing sharp fringes in t...

Advanced model-based control architecture overcomes the limitations state-of-the-art engine control and provides the potential of virtual sensors, for example for thrust and stall margin. “Tracking filters” are used to adapt the control parameters to actual conditions and to individual engines. For health monitoring standalone monitoring units will be used for on-board analysis to determine the...

We report about technology of fabrication and optimization of a gas sensor based on epitaxial graphene. Optimized graphene/metal contact configuration exhibited low contact resistance. Complementary annealing of graphene sensor after each gas exposure led to significant improvement in the sensing performance. The response of the annealed sensor to the nitrogen dioxide (NO 2 ) was tenfold higher...

Chemical gas sensors based on nanowires can find a wide range of applications in clinical assaying, environmental emission control, explosive detection, agricultural storage and shipping, and workplace hazard monitoring. Sensors in the forms of nanowires are expected to have significantly enhanced performance due to high surfacevolume ratio and quasi-one-dimensional confinement in nanowires. In...

Drift is an important issue that impairs the reliability of gas sensing systems. Sensor aging, memory effects and environmental disturbances produce shifts in sensor responses that make initial statistical models for gas or odor recognition useless after a relatively short period (typically few weeks). Frequent recalibrations are needed to preserve system accuracy. However, when recalibrations ...

MXene with distinctive structure, good electrical conductivity and abundant functional groups has shown great potential in the fabrication of high performance gas sensors. Since sensing mechanism MXene-based gas...

The results of an investigation of the performance of a time-division-addressed fiber-optic gas-sensor array by means of wavelength modulation of a distributed-feedback (DFB) laser are reported. The system performance is found to be severely limited by the extinction ratio of the optical switch used for pulse amplitude modulation. Formulas that relate the cross-talk level to the extinction rati...

Formaldehyde is a poisonous and harmful gas, which ubiquitous in our daily life. Long-term exposure to formaldehyde harms human body functions; therefore, it urgent fabricate sensors for the real-time monitoring of concentrations. Metal oxide semiconductor (MOS) gas favored by researchers as result their low cost, simple operation portability. In this paper, mechanism detection introduced, then...