Themed collection Gas sensing

In magnetic gas sensors, the change in the magnetic properties of the active materials is measured. In this review article, the working principles, fundamentals, recent developments, and future perspectives in magnetic gas sensors are reviewed.

Research focus on control growth of nanostructures, understanding of sensing mechanism through band model, LUMO energy, defect state density. Further, role of electrode for sensing and substrate for devices reliability has been discussed.

Summary and perspective on gas-sensing applications of ordered macroporous oxide nanostructures have been outlined in this review.

We design a gas sensor by combining two SWCNT-FET devices in an inverter configuration enabling a better system miniaturization together with a reduction of power consumption and ease of data processing.

Boron nanostructures obtained via a top-down approach can be efficiently used as the receptor in chemiresistive methane gas sensors.

Effect of mineral nutrients in biomass was found to be crucial in the synthesized carbon dots, affecting their dispersibility, PL stability and crystallinity.

A 3D porous SERS powder was developed in this study. Highly sensitive and homogeneous SERS detections on liquid and gas have been achieved, demonstrating potential application for an artificial “nose”.

This study emphasis on the effect of n–n heterojunctions in ZnO@In₂O₃ nanowires on boosting NO₂ sensing properties and elucidate the local electron transport properties during sensing process at room-temperature by in situ Conducting Probe Atomic Force Microscopy.

Hydrogen (H₂) sensing is crucial in a wide variety of areas, such as industrial, environmental, energy and biomedical applications. In this work, aluminum-doped zinc oxide (AZO) nanotubes are reported for optical hydrogen sensing.

Gas sensing uranium oxide nanoparticles were synthesized by microwave reaction based on uranyl-ethylene-glycol gel.

In this work, we leverage changes in the electronic properties of electrochemically dealloyed nanoporous gold to sense environmental humidity.

This study reports the synthesis of zirconia nanoparticles loaded on various carbon substrates, namely, reduced graphene oxide (Zr-r-GO), carbon nanotubes (Zr-CNT), and activated carbon (Zr-AC).

Due to the synergic effect between the electron depletion layer and the local hole accumulation layer at the p–n junctions of CuO|ZnO heterointerfaces, well-defined porous CuO-doped ZnO nanobelts exhibit an excellent sensing performance toward VOCs.

EGA-MS is presented as an experimental technique to characterize the surface of LnF₃ nanoparticles as a complementary approach to surface chemistry.

Quick and cost-effective fabrication of metal-halide nanostructure ozone sensors.

A corrugated graphene overlayer can increase the sensitivity and selectivity of local surface plasmon resonance-based vapour sensing with gold nanoparticles.

An LPG sensor operating at RT was fabricated with the morphology of CdS nanodroplets over silica microballs.

Fully printed, functionalized multi-walled carbon nanotube (FMWCNT)/hydroxyethyl cellulose (HEC) composite-based humidity sensor.

The fundamental development of the design of novel self-powered ozone sensing elements, operating at room temperature, based on p-type metal oxides paves the way to a new class of low cost, highly promising gas sensing devices.

Incorporation of reduced graphene oxide (rGO) modifies the properties of semiconducting metal oxide nanoparticles and makes it possible to tune the surface area and pore size to optimum values, which in turn improves their gas sensing properties.

The present study provides a significant conceptual advance in graphene oxide based humidity sensors. It is found that sensor response is directly dependent on the amount of OH⁻ groups. The proposed strategy to control OH⁻ in this report can make significant impact on the development of future smart GO-based humidity sensors and should be applicable to other gases.

A new humidity sensor based on a heterojunction of ZnO/PGAN is fabricated by a simple spraying process and the heterojunction can be directly applied to a diode-type humidity sensor.

Using first-principles theory, we investigated the most stable configuration for the Rh dopant on a MoSe₂ monolayer, and the interaction of the Rh-doped MoSe₂ (Rh-MoSe₂) monolayer with four toxic gases (CO, NO, NO₂ and SO₂) to exploit the potential application of the Rh-MoS₂ monolayer as a gas sensor or adsorbent.