High‐Performance Optoelectronic Gas Sensing Based on All‐Inorganic Mixed‐Halide Perovskite Nanocrystals with Halide Engineering

Abstract

Gas sensors are of great interest to portable and miniaturized sensing technologies with applications ranging from air quality monitoring to explosive detection and medical diagnostics, but the existing chemiresistive NO2 sensors still suffer from issues such as poor sensitivity, high operating temperature, and slow recovery. Herein, a high‐performance NO2 sensors based on all‐inorganic perovskite nanocrystals (PNCs) is reported, achieving room temperature operation with ultra‐fast response and recovery time. After tailoring the halide composition, superior sensitivity of ≈67 at 8 ppm NO2 is obtained in CsPbI2Br PNC sensors with a detection level down to 2 ppb, which outperforms other nanomaterial‐based NO2 sensors. Furthermore, the remarkable optoelectronic properties of such PNCs enable dual‐mode operation, i.e., chemiresistive and chemioptical sensing, presenting a new and versatile platform for advancing high‐performance, point‐of‐care NO2 detection technologies.

Perovskite Nanocrystals: Superior Luminogens for Food Quality Detection Analysis

“…Some perovskite nanocrystals have distinctively catalytic activity, such as glucose oxidase-like activity, which could be used to construct all nanozymes cascade reactions for biosensing and lower their cost . Therefore, perovskite nanocrystals with excellent photoluminescent quantum yields, a wide absorption range, predominant charge transfer properties, a narrow full width at half-maximum, a broad and regulatable emission range enshrouding the entire visible region, and distinctive catalytic activities represented tremendous superiorities in biosensing fields. ,− To improve future food practices through perovskite nanocrystals, we have herewith conducted a comprehensive discussion about perovskite nanocrystal-based biosensors according to the types of biosensing methods and the superiorities of perovskite nanocrystals.…”

Stable and Efficient Mixed‐halide Perovskite LEDs

“…mitigate trap state formation. [96] However, addressing the challenges of degradation in mixed-halide perovskites remains a complex and ongoing endeavor, requiring collaborations across materials science, chemistry, and device engineering. Ultimately, resolving these issues will be crucial to unlocking the full potential of mixed-halide perovskites for practical and sustainable optoelectronic applications.…”

Light-Induced Room-Temperature Gas Sensing by Donor-Doped Anatase TiO2 Ultrasmall Nanoparticles

“…19 In synthetic air, the response to strong oxidative gases, such as, NO 2 has also been reported without any kind of excitation for perovskite thin films 20 due to their exceptional selectivity toward NO 2 . 21 There have also been studies with MOS composites with liquid metal droplets toward an enhanced gas-sensing response. 22 However, most reports have been performed using dry analyte gases, with studies in ambient humidity being scarce.…”

“…TiO 2 composites can sense NH 3 in N 2 as well . In synthetic air, the response to strong oxidative gases, such as, NO 2 has also been reported without any kind of excitation for perovskite thin films due to their exceptional selectivity toward NO 2 . There have also been studies with MOS composites with liquid metal droplets toward an enhanced gas-sensing response .…”