Gas sensor properties of Ag- and Pd-decorated SnO micro-disks to NO2, H2 and CO: Catalyst enhanced sensor response and selectivity

Barbosa, Martin Schwellberger; Suman, Pedro H.; Kim, Jae J.; Tuller, Harry L.; Varela, José Arana; Orlandi, Marcelo Ornaghi

doi:10.1016/j.snb.2016.07.157

Cited by 103 publications

(57 citation statements)

References 33 publications

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“…To further improve the gas sensing performance, noble metals (e.g., Au, Pd, Pt, and Ag) have been employed to functionalize the SMO‐sensing materials, utilizing their catalysis and sensitization effect . Much work has recently been done to integrate mesoporous SMO‐sensing materials and noble metal nanocatalysts into high‐performance gas sensors.…”

Section: Introductionmentioning

confidence: 99%

Pt Nanoparticles Sensitized Ordered Mesoporous WO₃ Semiconductor: Gas Sensing Performance and Mechanism Study

Ren

Zhou

et al. 2017

Adv Funct Materials

260

173

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In this study, a straightforward coassembly strategy is demonstrated to synthesize Pt sensitized mesoporous WO 3 with crystalline framework through the simultaneous coassembly of amphiphilic poly(ethylene oxide)-b-polystyrene, hydrophobic platinum precursors, and hydrophilic tungsten precursors. The obtained WO 3 /Pt nanocomposites possess large pore size (≈13 nm), high surface area (128 m 2 g −1 ), large pore volume (0.32 cm 3 g −1 ), and Pt nanoparticles (≈4 nm) in situ homogeneously distributed in mesopores, and they exhibit excellent catalytic sensing response to CO of low concentration at low working temperature with good sensitivity, ultrashort response-recovery time (16 s/1 s), and high selectivity. In-depth study reveals that besides the contribution from the fast diffusion of gaseous molecules and rich interfaces in mesoporous WO 3 /Pt nanocomposites, the partially oxidized Pt nanoparticles that chemically and electronically sensitize the crystalline WO 3 matrix, dramatically enhance the sensitivity and selectivity.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/adfm.201705268. metal oxides (SMOs), such as WO 3 , [1] ZnO, [2] SnO 2 , [3] In 2 O 3 , [4] have attracted much attention for their wide applications in monitoring gas leakage, air quality, food safety, and medical diagnosis, [5][6][7][8][9] owing to their excellent properties including easy production, low-cost, long-term stability, and compact size. [10] A fast responserecovery dynamics, high sensitivity, and high selectivity are indispensable to highperformance gas sensors based on SMOs because some toxic and flammable gases (e.g., carbon monoxide), are colorless, odorless and tasteless, and extremely poisonous even at low concentrations. Considering that the gas-sensing process strongly relies on surface reactions between target gases and surface-chemisorbed oxygen species on the sensing layers, rational and controlled synthesis of nanomaterials with high surface areas, tailor-designed structure [11][12][13][14] combined with effective catalytic sensitization [15,16] is a promising approach to develop high-performance sensing sensors.SMO nanomaterials with mesoporous structures are promising candidates for gas sensing nanodevices due to their high specific surface area, highly depleted region in thin pore walls, and highly interconnected and adjustable ordered mesopores. [11,12] The high surface area favors the interaction between gas molecules and the solid porous oxide wall as well as the surface catalytic reaction. Moreover, the well-connected channels and a mesoscale (2−50 nm) pore size are advantageous to gas diffusion due to the facile penetration of gas molecules dominated by Knudsen diffusion. [12] To date, mesoporous SMOs can be synthesized through template-free method or templating method. The former includes sol-gel synthesis procedure, [17] spray pyrolysis, [18] and chemical vapor deposition, [3b] which usually lead to materials with ill-defined porous structur...

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Section: Introductionmentioning

confidence: 99%

Pt Nanoparticles Sensitized Ordered Mesoporous WO₃ Semiconductor: Gas Sensing Performance and Mechanism Study

Ren

Zhou

et al. 2017

Adv Funct Materials

260

173

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“…This hypothesis is supported by Barbosa et al [9], which prepared SnO 2 micro-disks made of tin oxide nanoparticles from the bulk oxide and carbon black, following a thermal treatment at 1135 C, then doped the resulted material with Ag or with Pd. Two distinctive mechanisms were proposed for the detection on the pure and doped oxide, since the ability of Pd to split in atoms of the hydrogen molecule involves its participation in adsorbed state.…”

Section: Influence Of the Sensing Surface Micro-or Nanostructurementioning

confidence: 74%

Electrochemical Sensors for Monitoring of Indoor and Outdoor Air Pollution

Creţescu¹,

Lutic²,

Manea³

2017

Electrochemical Sensors Technology

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This chapter aims a comprehensive presentation of the most common electrochemical sensors used in the real monitoring applications of air purity testing. Oxygen, hydrogen, hydrogen sulfide, nitrogen oxides, carbon monoxide and carbon dioxide are gases, which can be accurately detected and measured. Too high or too low oxygen concentration levels make the air improper for breathing. Hydrogen sulfide and carbon monoxide are dangerous species; any leakage needs to be pinpointed. A calibrated network of sensors for monitoring gas detection makes it possible to easily locate the source of gas escape during indoor air monitoring. The air quality monitoring stations based on electrochemical sensors are nowadays used to determine the global pollution index of the atmospheric air, in order to prevent the risks toward the human health and damage of environment, especially in the highly populated and industrialized urban areas.

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“…Because of their special catalytic activity when analytes (such as CO and H 2 ) are adsorbed on the sensor surface, they can effectively improve the sensing performance. [15][16][17][18] For example, SnO 2 nanoparticles decorated with 3 nm platinum exhibit 30 fold of response enhancement for NH 3 detection as well as increased linearity and faster response and recovery. 19 Highly sensitive and selective gas sensor using sputtering-decorated Pd/MnO 2 nanowalls provide fast response/recovery for H 2 within the concentration of 10-10 000 ppm.…”

Section: Introductionmentioning

confidence: 99%

PdO/SnO₂ heterostructure for low-temperature detection of CO with fast response and recovery

Wang

Yuan

et al. 2019

RSC Adv.

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Gas sensor properties of Ag- and Pd-decorated SnO micro-disks to NO2, H2 and CO: Catalyst enhanced sensor response and selectivity

Cited by 103 publications

References 33 publications

Pt Nanoparticles Sensitized Ordered Mesoporous WO₃ Semiconductor: Gas Sensing Performance and Mechanism Study

Pt Nanoparticles Sensitized Ordered Mesoporous WO₃ Semiconductor: Gas Sensing Performance and Mechanism Study

Electrochemical Sensors for Monitoring of Indoor and Outdoor Air Pollution

PdO/SnO₂ heterostructure for low-temperature detection of CO with fast response and recovery

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Gas sensor properties of Ag- and Pd-decorated SnO micro-disks to NO2, H2 and CO: Catalyst enhanced sensor response and selectivity

Cited by 103 publications

References 33 publications

Pt Nanoparticles Sensitized Ordered Mesoporous WO3 Semiconductor: Gas Sensing Performance and Mechanism Study

Pt Nanoparticles Sensitized Ordered Mesoporous WO3 Semiconductor: Gas Sensing Performance and Mechanism Study

Electrochemical Sensors for Monitoring of Indoor and Outdoor Air Pollution

PdO/SnO2 heterostructure for low-temperature detection of CO with fast response and recovery

Contact Info

Product

Resources

About

Pt Nanoparticles Sensitized Ordered Mesoporous WO₃ Semiconductor: Gas Sensing Performance and Mechanism Study

Pt Nanoparticles Sensitized Ordered Mesoporous WO₃ Semiconductor: Gas Sensing Performance and Mechanism Study

PdO/SnO₂ heterostructure for low-temperature detection of CO with fast response and recovery