Titanium nitride sensor for selective NO2 detection

Nature Communications, Journal Year: 2025, Volume and Issue: 16(1)

Published: Jan. 2, 2025

Efficient detection methods are needed to monitor nitrogen dioxide (NO2), a major NOx pollutant from fossil fuel combustion that poses significant threats both ecology and human health. Current NO2 technologies face limitations in stability selectivity. Here, we present transition metal nitride sensor exhibits exceptional selectivity for NO2, demonstrating sensitivity 30 times greater than of the strongest interfering gas, NO. The maintains over 6 months does not utilize platinum or other precious metals. This notable performance has been achieved through preparation highly active titanium (TiNx) nanoparticles with exceptionally large surface area high concentration vacancies. By contrast, commercial sample TiN shows no gas sensing activity. Such devices potentially scalable everyday demonstrate robust high-performance sensors based on inexpensive nitrides without metals leading candidates environmental monitoring technologies. A catalytic non-precious TiNx demonstrates excellent selectivity, sensitivity, long-term stability, making it candidate technology.

Language: Английский

Controlling the Spatiotemporal Self-Organization of Stimuli-Responsive Nanocrystals under Out-of-Equilibrium Conditions

Journal of the American Chemical Society, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 3, 2025

Self-organization under out-of-equilibrium conditions is ubiquitous in natural systems for the generation of hierarchical solid-state patterns complex structures with intricate properties. Efforts applying this strategy to synthetic materials that mimic biological function have resulted remarkable demonstrations programmable self-healing and adaptive materials. However, extension these efforts multifunctional stimuli-responsive across defined spatial distributions remains an unrealized technological opportunity. This paper describes use a nonequilibrium reaction–diffusion process achieve synthesis electrically conductive metal–organic framework (cMOF) gelled medium control over particle size periodicity on macroscopic scale. Upon integration into chemiresistive devices, resulting cMOF particles exhibit size-dependent response toward hydrogen sulfide gas, as determined by their distinct surface-to-volume ratio, porosity, unique methodology, unusual microcrystallite morphology compared counterparts obtained through bulk solution phase synthesis. Taken altogether, achievements pave way gaining access functional nanomaterials well-defined chemical composition, dimensions, precisely tailored functions using far-from-equilibrium approaches.

Language: Английский

A Nanoporous Covalent Organic Framework Film-Based Optical Waveguide Sensor for H₂S Gas Detection

ACS Applied Nano Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 19, 2025

Language: Английский