Ultrafast Detection of Low Acetone Concentration Displayed by Au-Loaded LaFeO₃ Nanobelts owing to Synergetic Effects of Porous 1D Morphology and Catalytic Activity of Au Nanoparticles

Abstract

Herein, we report on one-dimensional porous Au-modified LaFeO3 nanobelts (NBs) with high surface area, which were synthesized through the electrospinning method. The incorporation and coverage of Au nanoparticles (NPs) on the surface of the LaFeO3 NBs was achieved by adjusting the HAuCl amount in the precursor solution. Successful incorporation of Au NPs was examined by X-ray diffraction, high-resolution transmission electron microscopy, and X-ray photoelectron spectroscopy. The gas-sensing performance of both the pure and Au/LaFeO3 NB-based sensors was tested toward 2.5–40 ppm of acetone at working temperatures in the range from room temperature to 180 °C. The gas-sensing findings revealed that Au/LaFeO3 NB-based sensor with the Au concentration of 0.3 wt % displayed improved response of 125–40 ppm of acetone and rapid response and recovery times of 26 and 20 s, respectively, at an optimal working temperature of 100 °C. Furthermore, all sensors demonstrated an excellent response toward acetone and remarkable selectivity against NO2, NH3, CH4, and CO. Hence, the Au/LaFeO3-NB-based sensor is a promising candidate for sensitive, ultrafast, and selective acetone detections at low concentrations. The gas-sensing mechanism of the Au/LaFeO3 sensors is explained in consideration of the catalytic activity of the Au NPs, which served as direct adsorption sites for oxygen and acetone.

Engineering of Mesoporous Cube-like In2O3 Products as Ethanol Detection Platform at Low Operating Temperature: Effects of Different Transition Metals as Dopant Ions

“…The high specific surface area of the SMOs is generally known to produce maximum active centers for target gas molecules to be adsorbed, while porosity enables inward and outward diffusion of the target gas molecules from the sensing film, thus enhancing the intrinsic gas sensing performance. ,− For this reason, the surface area and porous features for the pure, 1Co–In 2 O 3 , 1Ni–In 2 O 3 , and 1Cu–In 2 O 3 products were examined via nitrogen adsorption/desorption tests, and the resulting isotherms and inserts depicting their pore size distribution are depicted in Figure (a-d). All In 2 O 3 products displayed type-IV isotherms as per IUPAC categorization exhibiting a hysteresis loop at high pressures of (0.8 < ( P / P 0 ) > 1.0).…”

“…Evidently, the 1Cu–In 2 O 3 sensor presented rapid response/recovery times in contrast to its counterparts which can be attributed to the fast rate of adsorption/desorption of ethanol gas molecules occurring on the sensor material. On the other hand, the large reactive centers produced by the elevated specific surface, as well as diffusion generated by the porous feature of the 1Cu–In 2 O 3 cube-like product can be associated with the improved response/recovery times …”

Visible‐Light‐Driven LaFeO3/CdS Heterojunction Photocatalysts for Photo‐Fenton Degradation of Levofloxacin

“…The crystal diffraction peaks of LaFeO 3 at 2θ of 22.6°, 32.2°, 39.7°, 46.2°, 57.4°, and 67.4°c orrespond to the crystal plane diffraction of LaFeO 3 phases (100), ( 110), ( 111), ( 200), (211), and (220), respectively, in line with JCPDS No. 75-0541 [20] (Figure S1). The crystal diffraction peaks of CdS at 2θ of 24.8°, 26.5°, 28.2°, 36.6°, 43.7°, 47.8°, and 51.8°correspond to the crystal plane diffraction of CdS phases (100), (002), (101), (102), (110), (103), and (112), respectively, in line with JCPDS No.…”

The enhanced sensing properties of MOS-based resistive gas sensors by Au functionalization: a review

“…191 In recent years, Au/perovskite materials have been applied in gas sensors, showing excellent performance. [192][193][194] However, so far, research on Au/ MOS/perovskite is still lacking. According to existing research, Au/MOS/perovskite demonstrates relatively good performance, and details will be mentioned in the following content.…”