Cu²⁺-Doped SnO₂ Nanograin/Polypyrrole Nanospheres with Synergic Enhanced Properties for Ultrasensitive Room-Temperature H₂S Gas Sensing

Abstract

The organic–inorganic nanohybrids are emerging as one of the most attractive sensing materials in the area of gas sensors and usually exhibit some advanced properties because of synergetic/complementary effects between organic molecules and inorganic components. This work demonstrates a novel class of organic–inorganic nanohybrids, Cu2+-doped SnO2 nanograin/poly pyrrole nanospheres, for the sensitive room-temperature H2S gas sensing. Doping Cu2+ in SnO2 nanograins remarkably enhances the surface potential barrier by tailoring surface defects. After polymerizing pyrrole surrounded nanograins in aqueous media to form the organic–inorganic nanohybrids, the resulting nanoheterojunctions further improve the sensitivity. Additionally, the nanohybrids-based sensor provides high surface area and abounding reaction sites to accelerate gas diffusion and adsorption as well as the electron transfer. Compare with pristine SnO2 nanograins alone, the sensitivity of using the nanohybrids increases 7 times for the detection of 50-ppm of H2S. The response and recovery rate can increase 27 and 22 times at room temperature, respectively. Significantly, this work provides an attractive material for the real-time monitoring of H2S, whereas the insights into organic–inorganic composite interactions within the sensing mechanism may pave the way for designing functional materials with tailored properties.

Versatile Three‐Dimensional Porous Cu@Cu2O Aerogel Networks as Electrocatalysts and Mimicking Peroxidases

“…The peak at 530.3 eV indicates that oxygen is present in the Cu 2 O lattice,w hile the main peak present at 533.0 eV is attributed to surface species in the Cu@Cu 2 Oaerogels. [21] To examine the electrocatalytic behavior of Cu@Cu 2 O aerogels towards glucose oxidation, the cyclic voltammetry CV) measurements were carried out. [21] To examine the electrocatalytic behavior of Cu@Cu 2 O aerogels towards glucose oxidation, the cyclic voltammetry CV) measurements were carried out.…”

Versatile Aerogels for Sensors

“…Therefore, these aerogel‐based gas sensors often have high sensitivity, low detection limit, and fast response and recovery rate . Moreover, the excellent selectivity and stability can be easily realized by the introducing different compounds together to get a composite aerogel due to the synergistic effect . These aerogel‐based gas sensors are shown in Table 1 .…”

“…[134,182,183] Moreover, the excellent selectivity and stability can be easily realized by the introducing different compounds together to get a composite aerogel due to the synergistic effect. [63,[184][185][186] These aerogel-based gas sensors are shown in Table 1.…”

Hierarchical Self‐Assembly of Tetrakis(1‐pyrenyl)porphyrins into Microscopic Petals and Flowers with Ultrasensitive Room‐Temperature NO2 Sensing in a Broad Humidity Range

“…Conventional inorganic metal‐oxide‐semiconductor‐based gas sensors have drawn interest from researchers over the last several decades due to their high sensitivity and low detection limit. However, the high operating temperature (normally 200–500 °C) for metal oxide‐based gas sensors not only increase the difficulties in the preparation process but severely limits their practical applications in many areas, such as low temperatures environments . Moreover, published works hardly reported the effect of humidity variation on the gas sensing response despite this point being of the utmost importance in the practical application .…”

“…However, the high operating temperature (normally 200-500°C) for metal oxide-based gas sensors not only increase the difficulties in the preparation process but severely limits their practical applications in many areas, such as low temperatures environments. [1][2][3] Moreover, published works hardly reported the effect of humidity variation on the gas sensing response despite this point being of the utmost importance in the practical application. [4] Therefore, developing ultrasensitive room-temperature gas sensors that can be operated at broad humidity ranges are highly desired.…”