Ultrafine Pt-doped SnO2 mesopore nanofibers-based gas sensor for enhanced acetone sensing

Cui, Shaobo; Qin, Jiaqiong; Liu, Wei

doi:10.1016/j.cjac.2022.100188

Cited by 13 publications

(1 citation statement)

References 36 publications

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“…In addition to physical properties, chemical properties must also be considered for explaining different behaviors of gas molecules adsorbing on the surface of the MoS 2 /AuPt/SnO 2 nanocomposite. The bond dissociation energy of NO 2 gas is 305 kJ mol –1 , which is lower than that of C 2 H 6 O (436 kJ mol –1 ), C 3 H 6 O (393 kJ mol –1 ), NH 3 (452 kJ mol –1 ), C 3 H 8 O (381 kJ mol –1 ), and CO (1077 kJ mol –1 ) gases, respectively. − During adsorption, gas molecules must react with the adsorbed oxygen ions (O – or O 2– ) for chemisorption on the surface of the sensing layer, which changes the carrier concentration in the sensing layer. Gas molecules that have low bond dissociation energies could more easily be broken and then react with adsorbed oxygen ions to participate in chemisorption with the sensing material at a lower temperature .…”

Section: Resultsmentioning

confidence: 99%

Room-Temperature NO₂ Detection by MoS₂–Nanoflake-Decorated AuPt/SnO₂ Nanotubes

Wang,

Cao,

Zhang

et al. 2023

ACS Appl. Nano Mater.

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Although SnO 2 nanomaterials have been leading components of semiconductor gas sensors, their long-standing challenges of high working temperatures limit their practical application for ultralow-power-consumption room-temperature sensing. In this study, Au and Pt bimetallic nanoparticles were used to fabricate a MoS 2 /AuPt/SnO 2 nanocomposite device by interfacially engineering a MoS 2 /SnO 2 nanostructure. Owing to the unique structure and electrical properties, the as-fabricated MoS 2 /AuPt/SnO 2 device exhibits a remarkable sensing response (2.22), short response time (20 s), and excellent baseline recovery (8 s) to 10 ppm NO 2 gas at 23 ± 2 °C. Meanwhile, the MoS 2 / AuPt/SnO 2 device possesses high sensitivity, a low detection limit (20 ppb), commendable reversibility, appreciable stability, and excellent selectivity against ammonia, carbon monoxide, ethanol, isopropanol, and acetone gases. The superior sensing characteristics of the MoS 2 /AuPt/SnO 2 nanocomposite device are attributed to the modulation effect of the Schottky junction and p−n heterojunction on the potential barrier, highly efficient interfacial electron transport, and edge-enriched structure, which provide abundant active adsorption sites. This work will advance the evolution of room-temperature gas-sensitive nanomaterials and render them promising for applications in ultralow power-integrated sensors.

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