Simple post-synthesis of mesoporous p-type Co3O4 nanochains for enhanced H2S gas sensing performance

Quang, Pham Long; Cuong, Nguyen Duc; Hòa, Trần Thái; Long, Hoang Thai; Hung, Chu Manh; Le, Dang Thi Thanh; Hieu, Nguyen Van

doi:10.1016/j.snb.2018.05.026

Cited by 58 publications

(27 citation statements)

References 39 publications

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“…The Fermi level passes the K point under the natural state. When W0G gas sensor is exposed to air at a working temperature, the oxygen molecules adsorbed on the surface of rGO will grasp electrons from the conduction band to form oxygen species (O 2 − and O − ) and an amount of holes, namely, positive charge carriers are generated at the same time [ 64 ]. Therefore, the W0G exhibits a p-type property with Fermi level below the K point.…”

Section: Resultsmentioning

confidence: 99%

High Performance Acetylene Sensor with Heterostructure Based on WO3 Nanolamellae/Reduced Graphene Oxide (rGO) Nanosheets Operating at Low Temperature

et al. 2018

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The development of functionalized metal oxide/reduced graphene oxide (rGO) hybrid nanocomposites concerning power equipment failure diagnosis is one of the most recent topics. In this work, WO3 nanolamellae/reduced graphene oxide (rGO) nanocomposites with different contents of GO (0.5 wt %, 1 wt %, 2 wt %, 4 wt %) were synthesized via controlled hydrothermal method. X-ray diffraction (XRD), transmission electron microscopy (TEM), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), thermogravimetric analyses-derivative thermogravimetric analysis-differential scanning calorimetry (TG-DTG-DSC), BET, and photoluminescence (PL) spectroscopy were utilized to investigate morphological characterizations of prepared gas sensing materials and indicated that high quality WO3 nanolamellae were widely distributed among graphene sheets. Experimental ceramic planar gas sensors composing of interdigitated alumina substrates, Au electrodes, and RuO2 heating layer were coated with WO3 nanolamellae/reduced graphene oxide (rGO) films by spin-coating technique and then tested for gas sensing towards multi-concentrations of acetylene (C2H2) gases in a carrier gas with operating temperature ranging from 50 °C to 400 °C. Among four contents of prepared samples, sensing materials with 1 wt % GO nanocomposite exhibited the best C2H2 sensing performance with lower optimal working temperature (150 °C), higher sensor response (15.0 toward 50 ppm), faster response-recovery time (52 s and 27 s), lower detection limitation (1.3 ppm), long-term stability, and excellent repeatability. The gas sensing mechanism for enhanced sensing performance of nanocomposite is possibly attributed to the formation of p-n heterojunction and the active interaction between WO3 nanolamellae and rGO sheets. Besides, the introduction of rGO nanosheets leads to the impurity of synthesized materials, which creates more defects and promotes larger specific area for gas adsorption, outstanding conductivity, and faster carrier transport. The superior gas sensing properties of WO3/rGO based gas sensor may contribute to the development of a high-performance ppm-level gas sensor for the online monitoring of dissolved C2H2 gas in large-scale transformer oil.

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Section: Resultsmentioning

confidence: 99%

High Performance Acetylene Sensor with Heterostructure Based on WO3 Nanolamellae/Reduced Graphene Oxide (rGO) Nanosheets Operating at Low Temperature

et al. 2018

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“…5 Among the different types of gas sensors, the ones based on semiconductor metal oxide (SMO) nanostructures are suitable for integration into IoT devices because of their low-cost fabrication, ease of sensing layer synthesis and optimum gas response and sensitivity. [6][7][8] However, these SMO-based sensors work at elevated temperatures, causing high-power consumption and hampering the practical applications of gas sensors in IoT devices. Therefore, the power consumption of gas sensors based on SMO must be reduced to widen their application in portable IoT-based devices.…”

Section: Introductionmentioning

confidence: 99%

Controlled synthesis of ultrathin MoS₂nanoflowers for highly enhanced NO₂sensing at room temperature

et al. 2020

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“…[150] The gas sensing mechanism of metal oxide semiconductors relate to the change of their electrical conductivity by the chemisorptions and reactions of target gas molecules with oxygen species on the surface of sensors. [151] The performance of semiconductor gas sensors is significantly dependent on the type of semiconductor materials as well as their morphology. The change of the electron-depletion layer/hole-accumulation thickness can effectively tune either channel width inside particles or thickness/height of the interparticle energy barrier, resulting in the transduction of the surface reaction to conductivity change.…”

Section: Semiconductor Gas Nanosensorsmentioning

confidence: 99%

Progress through synergistic effects of heterojunction in nanocatalysts ‐ Review

Cuong

Quang

2020

Vietnam Journal of Chemistry

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There are major advances in the development of the nanostructured materials to enhance the reaction performance in catalytic field. Recent efforts have shown that high conversion efficiency and stability of efficient nanocatalysts can be achieved by combining the intrinsic properties of single components into heterostructures. The unprecedented combination affords the integrated nanocatalysts capable of overcoming the limitations of single components and addressing the issues of the assessment of the efficiency of the catalytic converters. The present review gives a concise overview of the heterostructured nanoarchitectures with a focus of the tailoring of their structural geometry, self‐construction and surface chemistry to effectively create integrated catalysts with multi‐functionalities. The novel integrated catalysts present in the critical review were emphasized these concepts by undergoing inherent synergistic effects in their heterojunction structures to emerge superior catalytic performance and high selectivity for promising applications. Various types of the integrated nanocatalysts including coupled particles, porous composites, organized hybrids, assembled films, and biomimetic replicas are presented in respect to the discussion of expressive statements for widespread emerging applications in artificial photosynthesis, graphene‐based catalysts, electrochemical gas sensing, water‐gas shift reaction, and methane fuel generation.

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Simple post-synthesis of mesoporous p-type Co3O4 nanochains for enhanced H2S gas sensing performance

Cited by 58 publications

References 39 publications

High Performance Acetylene Sensor with Heterostructure Based on WO3 Nanolamellae/Reduced Graphene Oxide (rGO) Nanosheets Operating at Low Temperature

High Performance Acetylene Sensor with Heterostructure Based on WO3 Nanolamellae/Reduced Graphene Oxide (rGO) Nanosheets Operating at Low Temperature

Controlled synthesis of ultrathin MoS₂nanoflowers for highly enhanced NO₂sensing at room temperature

Progress through synergistic effects of heterojunction in nanocatalysts ‐ Review

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Simple post-synthesis of mesoporous p-type Co3O4 nanochains for enhanced H2S gas sensing performance

Cited by 58 publications

References 39 publications

High Performance Acetylene Sensor with Heterostructure Based on WO3 Nanolamellae/Reduced Graphene Oxide (rGO) Nanosheets Operating at Low Temperature

High Performance Acetylene Sensor with Heterostructure Based on WO3 Nanolamellae/Reduced Graphene Oxide (rGO) Nanosheets Operating at Low Temperature

Controlled synthesis of ultrathin MoS2nanoflowers for highly enhanced NO2sensing at room temperature

Progress through synergistic effects of heterojunction in nanocatalysts ‐ Review

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Controlled synthesis of ultrathin MoS₂nanoflowers for highly enhanced NO₂sensing at room temperature