Anchoring Pt Particles onto Mesoporousized ZnO Holey Cubes for Triethylamine Detection with Multifaceted Superiorities

Abstract

Designing sensing materials with integrating unique spatial structures, functional units, and surface activity is vital to achieve high‐performance gas sensor toward triethylamine (TEA) detection. Herein, a simple spontaneous dissolution is used with subsequent thermal decomposition strategy to fabricate mesoporousized ZnO holey cubes. The squaric acid is crucial to coordinate Zn2+ to form a cubic shape (ZnO‐0) and then tailor the inner part to open a holey cube with simultaneously mesoporousizing the left cubic body (ZnO‐72). To enhance the sensing performance, the mesoporous ZnO holey cubes have been functionalized with catalytic Pt nanoparticles, which deliver superior performances including high response, low detection limit, and fast response and recovery time. Notably, the response of Pt/ZnO‐72 towards 200 ppm TEA is up to 535, which is much higher than those of 43 and 224 for pristine ZnO‐0 and ZnO‐72. A synergistic mechanism combining the intrinsic merits of ZnO, its unique mesoporous holey cubic structure, the oxygen vacancies, and the catalytic sensitization effect of Pt has been proposed for the significant enhancement in TEA sensing. Our work provides an effective facile approach to fabricate an advanced micro‐nano architecture with manipulating its spatial structure, functional units, and active mesoporous surface for promising TEA gas sensors.

Interface Defects and Carrier Regulation in MOF-Derived Co3O4/In2O3 Composite Materials for Enhanced Selective Detection of HCHO

“…Nitrogen adsorption/desorption tests (Figure S3) showed that the BET-specific surface areas of In 2 O 3 and MZO samples were 57.24, 62.52, 62.78, and 59.81 m 2 /g (Table ), indicating mesoporous materials with an average pore size of 16–18 nm . Moderate Co 3 O 4 decoration significantly increased the specific surface area of the material, while excessive Co 3 O 4 tended to aggregate on the surface of the main material In 2 O 3 , reducing the effective contact area and specific surface area . Generally, the hollow framework structure, large specific surface area, high porosity, and small grain size provide abundant pathways for gas transport, facilitating gas adsorption–desorption and interface charge transfer during gas sensing processes …”

“…41 Moderate Co 3 O 4 decoration significantly increased the specific surface area of the material, while excessive Co 3 O 4 tended to aggregate on the surface of the main material In 2 O 3 , reducing the effective contact area and specific surface area. 2 Generally, the hollow framework structure, large specific surface area, high porosity, and small grain size provide abundant pathways for gas transport, facilitating gas adsorption−desorption and interface charge transfer during gas sensing processes. 42 Further analysis of the crystal structure and lattice parameters of the sensing material was conducted by using X-ray diffraction (XRD).…”

“…The bandgap widths of different samples were estimated using UV−vis spectroscopy (Figure S7) in the range of 200−800 nm and plotted on a Tauc plot (Figure 2f). The bandgap width (E g ) was calculated using the Tauc equation (αhν) 2 = A(hν − E g ), where α, h, ν, and A are the absorbance index, Planck constant, frequency, and material-specific constant, respectively. 61 The E g obtained was as follows: E g (MZO-6) = 3.23 eV < E g (MZO-9) = 3.26 eV < E g (MZO-3) = 3.28 eV < E g (In 2 O 3 ) = 3.35 eV.…”

“…The resistive gas sensors have broad prospects in indoor air quality monitoring, hazardous gas detection in factories, early disease monitoring, and other fields. − Compared to semiconductor materials like two-dimensional materials, , carbon nanotubes, and conductive polymers, the metal oxide semiconductors (such as ZnO, In 2 O 3 , and SnO 2 ) offer advantages such as fast response speed, high sensitivity, good stability, and low cost, making them the most widely used gas sensing materials …”

Novel Mixed-Phase α/γ-Fe2O3 Micro-Flower Assembled with Nanosheets for Enhancing Acetone Detection

“…Following our previous procedures [29,30], the gas sensors were fabricated. At the very beginning, a homogeneous paste was formed by mixing 0.1 gas-synthesized powder with 0.2 mL deionized water.…”