Two-dimensional semiconducting covalent organic nanosheets for highly sensitive and stable NO₂ sensing under humid conditions

Abstract

Semiconductor metal oxide gas sensors do not provide selective and sensitive gas adsorption under humid conditions owing to the deactivation of active sites by environmental humidity, leading to inaccurate signal...

Two‐Dimensional Organic/Inorganic Hybrid Nanosheet Electrodes for Enhanced Electrical Conductivity toward Stable and High‐Performance Sodium‐Ion Batteries

“…The average basal spacing of the bright regions (Regions 1–3) was estimated as 3.4 nm, which is almost identical to the known value for GNs (Figure S7, see Supporting Information). In contrast, that of the relatively dark region (Region 4) was estimated as 3.6 nm, indicating CON phases which were proven in the previous literature with fast Fourier transform (FFT) [48] . Therefore, it could be suggested that CONs formed framework structures on GNs surfaces rather than existed in amorphous polymers even though CONs did not show diffraction peaks in PXRD (Figure 2b).…”

Electroactive covalent organic frameworks: a new choice for organic electronics

“…Through physical or chemical interactions, absorbed analytes change the internal environment and thereby affect the electroactivity. This mechanism of sensing can be integrated into various device architectures, including resistive sensors [78,79], FET-type sensors [80][81][82], and synaptic sensors [83]. For instance, utilizing the binding potential towards Ni-phthalocyanine incorporated in a COF for various analytes, chemiresistive devices based on this COF show a highly sensitive response to a series of gases like NH 3 , H 2 S, NO, and NO 2 (Figure 5A) [12].…”

“…With semiconductivity and recognition ability, COFs can act as the active layer in OFET-based sensors. The semiconducting CON-10 was utilized to fabricate a NO 2 sensor with a super-hydrophobic surface [80]. As a result, the device showed a humidity-independent NO 2 response with high sensitivity in the humidity range of 0-87%.…”

Highly conjugated three-dimensional van der Waals heterostructure-based nanocomposite films for ultrahigh-responsive TEA gas sensors at room temperature

“…The sensing materials prepared by this method can not only highlight the sensing advantages of the quantum crystal itself but also provide channels for efficient carrier transmission, resulting in a signicant improvement in the sensing performance. 21,22 Covalent organic frameworks (COFs) are a class of twodimensional covalently constructed organic crystal materials with pre-designed properties owing to the low-dimensional pelectronic skeleton and highly ordered topology. These components are arranged into periodic planar networks, and nally superposed in the vertical direction to form a layered structure with consistent atomic accuracy.…”