Exploring 2D hexagonal WO₃/COK-12 nanostructures for efficient humidity detection

Abstract

This research reports a pioneering approach to humidity sensing by leveraging the unique properties of 2D hexagonal mesoporous COK-12 (Centrum voor Oppervlaktechemie & Katalyse-12/ Center for Surface Chemistry & Catalysis...

A three-dimensional ZnO/TUD-1 nanocomposite-based multifunctional sensor for humidity detection and wastewater remediation

“…However, as the concentration of ZnO within the siliceous material increased, a sharp and significant decline in resistance, amounting to a four-order magnitude change, was evident in the ZnO/TUD-1(10) sensor. 3,4 This phenomenon of improved conductivity can be attributed to the uniform distribution of zinc oxide nanoparticles within the silica matrix, as confirmed by FESEM and HRTEM analysis. ZnO, being a semiconducting material, acts as a sensitizing agent when incorporated into the mesoporous structure of TUD-1.…”

“…ZnO/TUD-1 nanocomposites exhibit type IV isotherms and H2 hysteresis loops in the N 2 physisorption isotherms at 77 K. This reflects their retained disordered mesoporous structural properties with a very slight decrease in retentivity curve. 3,4,14 However, for x = 15%, the hysteresis loop is transformed to a vertical H1 pattern. This transformation indicates a reduction in mesoporous characteristics, attributed to pore constriction.…”

“…Initially, water molecules dissociate into OH − and H + , chemisorbing onto the composite surface, serving as the primary conduction process at a low RH. 3,4 As RH increases, the quantity of water molecules adsorbed becomes very high, resulting in the continuous formation of both physisorbed and chemisorbed water layers as represented in Fig. 14.H 2 O → H + + OH − (Chemical adsorption)2H 2 O → H 3 O + + OH − (Physical adsorption)H 3 O + → H 2 O + H + …”

“…TUD-1, renowned for its highly disordered and tuneable porous structure, has gained prominence in the realm of materials science and sensor development. [3][4][5] The concept of resistancebased humidity sensors hinges on the electrical properties of the sensing material, as the RH of the surrounding environment changes, and the electrical conductivity of the sensing material is altered. [6][7][8] This change in conductivity is harnessed to provide a quantitative measure of humidity.…”

Efficient photo-oxidation of bisphenol a and tetracycline through sulfur-doped g-C3N4/CD heterojunctions

“…Furthermore, the presence of carbon dots (CD) in g-C 3 N 4 nanocomposites can facilitate interfacial charge transfer and separation through heterojunction formation, leading to enhanced photocatalytic efficiency 25–30 The intimate contact between CD and g-C 3 N 4 promotes efficient electron transfer across the interface, facilitating rapid redox reactions and improving overall catalytic activity. 31 Additionally, the presence of CD can alter the band structure of g-C 3 N 4 , leading to a red shift in the light absorption spectrum and enabling utilization of a broader range of solar radiation for photocatalysis.…”