Au-loaded mesoporous WO3: Preparation and n-butanol sensing performances

Wang, Qingji; Zhang, Bo; Liu, Jie; Yang, Qiuyue; Cui, Xiaobiao; Gao, Yuan; Chuai, Xiaohong; Liu, Fengmin; Sun, Peng; Liang, Xishuang; Sun, Yanfeng

doi:10.1016/j.snb.2016.05.097

Cited by 101 publications

(32 citation statements)

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“…70 Many studies have demonstrated that the addition of Au NPs to nano-and microstructures of metal oxides leads to an enhancement in the overall response and selectivity to VOC vapors. [67][68][69][70][71] The proposed reaction for the oxidation of the VOC molecules by the adsorbed oxygen species can be described as follows: 11,70,[72][73][74] (Acetone) CH 3 The high response to 2-propanol, compared to other VOC vapors, can be explained by the presence of methyne (CH) groups, which are essential for a more efficient decomposition and oxidation of this molecule. 75,76 The general reaction can be described as: 77 VOC + nO À / aCO 2 + bH 2 O + ne À (7)…”

Section: Gas Sensing Mechanism For Bimetallic Alloy Np-decorated Lmsmentioning

confidence: 99%

Surface functionalization of ZnO:Ag columnar thin films with AgAu and AgPt bimetallic alloy nanoparticles as an efficient pathway for highly sensitive gas discrimination and early hazard detection in batteries

et al. 2020

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Section: Gas Sensing Mechanism For Bimetallic Alloy Np-decorated Lmsmentioning

confidence: 99%

Surface functionalization of ZnO:Ag columnar thin films with AgAu and AgPt bimetallic alloy nanoparticles as an efficient pathway for highly sensitive gas discrimination and early hazard detection in batteries

et al. 2020

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“…Much work has recently been done to integrate mesoporous SMO‐sensing materials and noble metal nanocatalysts into high‐performance gas sensors. Precious metal loaded mesoporous WO 3 materials have been reported by using the complicated hard templating synthesis of mesoporous WO 3 followed by loading noble metal via impregnation . Precious metal ions embedded in protein nanocages or metal−organic framework were prepared for electrospinning and calcination to synthesize SMO nanofibers with immobilized metal nanoparticles (e.g., Au, Pt, and Pd), which improved the dispersity of noble metal nanoparticles in SMO .…”

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

254

179

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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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“…Similarly the Ti−2p (Ti 4+ ) peaks at 457.5 eV (2p 3/2 ) and 463.1 eV (2p 1/2 ) in CT mesocrystals got shifted to higher BE values at 458.2 eV and 463.9 eV, respectively in CTMG20 nanocomposite (Figure c) . The O−1s peak for CT (Figure d) was deconvoluted in three peaks at BE values 528.6 eV, 530.7 eV and 532.6 eV, wherein the peak at 528.6 eV arises from CT lattice oxygen whereas the peaks at 530.7 eV and 532.6 eV can be assigned to adsorbed oxygen (O − and O 2 − ions) and surface hydroxyl groups . In CTMG20 nanocomposite as well, similar peaks could be evidenced with higher BE values at 529.4 eV, 530.7 eV and 532.7 eV (Figure g).…”

Section: Resultsmentioning

confidence: 89%

Interplay between Mesocrystals of CaTiO₃ and Edge Sulfur Atom Enriched MoS₂ on Reduced Graphene Oxide Nanosheets: Enhanced Photocatalytic Performance under Sunlight Irradiation

et al. 2020

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In this work, an attempt has been made to strategically and systematically design novel and multifunctional nanocomposite photocatalysts by coupling mesocrystals of CaTiO3 with edge‐sulfur‐atoms‐enriched MoS2 and reduced graphene oxide (RGO) nanosheets. A remarkable enhancement in photocatalytic activity could be evidenced with an optimized content (20 %) of MoS2−RGO nanosheets coupled with CaTiO3 mesocrystals. This nanocomposite showed a 33‐fold enhanced photocatalytic hydrogen evolution in comparison to bare CaTiO3, with apparent quantum efficiencies of 5.4 %, 3.0 % and 17.7 % at 365, 420 and 600 nm monochromatic wavelengths. In addition, the excellent adsorptive degradation of different organic pollutants was also achieved with these photocatalysts, which revealed their multifunctional behavior. The enhanced photocatalytic performance can be accredited mainly to following factors: (i) Intimate contact between constituent materials and efficient charge transfer across the ternary heterojunction, which suppresses photogenerated charge recombination; (ii) The high surface area provides abundant sites for reactant adsorption and further reaction; (iii) Defect‐rich MoS2 with sulfur atoms on the exposed edges provide sticky sites for H+ ions and hence enhance the hydrogen generation. The design strategy employed in this work can be adopted to improve the properties and performance of other mesocrystals, which can lead to the fabrication of low‐cost and multifunctional catalysts for diverse applications.

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Au-loaded mesoporous WO3: Preparation and n-butanol sensing performances

Cited by 101 publications

References 50 publications

Surface functionalization of ZnO:Ag columnar thin films with AgAu and AgPt bimetallic alloy nanoparticles as an efficient pathway for highly sensitive gas discrimination and early hazard detection in batteries

Surface functionalization of ZnO:Ag columnar thin films with AgAu and AgPt bimetallic alloy nanoparticles as an efficient pathway for highly sensitive gas discrimination and early hazard detection in batteries

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

Interplay between Mesocrystals of CaTiO₃ and Edge Sulfur Atom Enriched MoS₂ on Reduced Graphene Oxide Nanosheets: Enhanced Photocatalytic Performance under Sunlight Irradiation

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Au-loaded mesoporous WO3: Preparation and n-butanol sensing performances

Cited by 101 publications

References 50 publications

Surface functionalization of ZnO:Ag columnar thin films with AgAu and AgPt bimetallic alloy nanoparticles as an efficient pathway for highly sensitive gas discrimination and early hazard detection in batteries

Surface functionalization of ZnO:Ag columnar thin films with AgAu and AgPt bimetallic alloy nanoparticles as an efficient pathway for highly sensitive gas discrimination and early hazard detection in batteries

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

Interplay between Mesocrystals of CaTiO3 and Edge Sulfur Atom Enriched MoS2 on Reduced Graphene Oxide Nanosheets: Enhanced Photocatalytic Performance under Sunlight Irradiation

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

Interplay between Mesocrystals of CaTiO₃ and Edge Sulfur Atom Enriched MoS₂ on Reduced Graphene Oxide Nanosheets: Enhanced Photocatalytic Performance under Sunlight Irradiation