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  1. Article ; Online: Real-Time Monitoring of Air Discharge in a Switchgear by an Intelligent NO

    Wang, Qiongyuan / Li, Haoyuan / Chu, Jifeng / Pan, Jianbin / Yang, Aijun / Xiao, Song / Yuan, Huan / Rong, Mingzhe / Wang, Xiaohua

    ACS sensors

    2023  Volume 8, Issue 12, Page(s) 4646–4654

    Abstract: An air-insulated power equipment adopts air as the insulating medium and is widely implemented in power systems. When discharge faults occur, the air produces decomposition products represented by ... ...

    Abstract An air-insulated power equipment adopts air as the insulating medium and is widely implemented in power systems. When discharge faults occur, the air produces decomposition products represented by NO
    Language English
    Publishing date 2023-11-17
    Publishing country United States
    Document type Journal Article
    ISSN 2379-3694
    ISSN (online) 2379-3694
    DOI 10.1021/acssensors.3c01676
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Research progress and prospects on gas-sensitive mechanisms of semiconductor sensors.

    Chu, Jifeng / Pan, Jianbin / Wang, Qiongyuan / Yang, Aijun / Song, Shizhen / Yuan, Huan / Rong, Mingzhe / Wang, Xiaohua

    Physical chemistry chemical physics : PCCP

    2023  Volume 25, Issue 18, Page(s) 12668–12683

    Abstract: Semiconductor materials with wide bandgaps are extensively employed for gas detection due to their advantages of low cost, high sensitivity, fast speed, excellent stability, and distinctive selectivity. Previous studies have reported on different kinds ... ...

    Abstract Semiconductor materials with wide bandgaps are extensively employed for gas detection due to their advantages of low cost, high sensitivity, fast speed, excellent stability, and distinctive selectivity. Previous studies have reported on different kinds of semiconductor materials and their complex synthesis procedures. However, the research progress on gas-sensitive mechanisms seriously lags behind the performance improvement. The research route of the gas-sensing mechanism is not clear, resulting in an unclear development direction of novel sensitive materials. This review aims to summarize existing approaches and their progress on the interpretation of gas-sensing mechanisms in semiconductors, such as the calculations based on density functional theory, semiconductor physics, and
    Language English
    Publishing date 2023-05-10
    Publishing country England
    Document type Journal Article ; Review
    ZDB-ID 1476244-4
    ISSN 1463-9084 ; 1463-9076
    ISSN (online) 1463-9084
    ISSN 1463-9076
    DOI 10.1039/d3cp00030c
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Multivariate Evaluation Method for Screening Optimum Gas-Sensitive Materials for Detecting SF

    Chu, Jifeng / Yang, Xu / Yang, Aijun / Wang, Dawei / Yuan, Huan / Wang, Xiaohua / Rong, Mingzhe

    ACS sensors

    2020  Volume 5, Issue 7, Page(s) 2025–2035

    Abstract: In previous studies, the selection of optimal gas-sensing materials for detecting target gases mainly relied on their response value, but other indices, such as the recovery capability of materials, have usually been overlooked. Here, we propose a new ... ...

    Abstract In previous studies, the selection of optimal gas-sensing materials for detecting target gases mainly relied on their response value, but other indices, such as the recovery capability of materials, have usually been overlooked. Here, we propose a new method for evaluating sensor effectiveness that includes a broader range of performance indices. In this study, four gas sensors based on metal-oxide semiconductors (WO
    MeSH term(s) Gases ; Oxides ; Semiconductors ; Sulfur Hexafluoride ; Temperature
    Chemical Substances Gases ; Oxides ; Sulfur Hexafluoride (WS7LR3I1D6)
    Language English
    Publishing date 2020-07-10
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 2379-3694
    ISSN (online) 2379-3694
    DOI 10.1021/acssensors.0c00463
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Multicomponent SF

    Chu, Jifeng / Yang, Aijun / Wang, Qiongyuan / Yang, Xu / Wang, Dawei / Wang, Xiaohua / Yuan, Huan / Rong, Mingzhe

    Microsystems & nanoengineering

    2021  Volume 7, Page(s) 18

    Abstract: A difficult issue restricting the development of gas sensors is multicomponent recognition. Herein, a gas-sensing (GS) microchip loaded with three gas-sensitive materials was fabricated via a micromachining technique. Then, a portable gas detection ... ...

    Abstract A difficult issue restricting the development of gas sensors is multicomponent recognition. Herein, a gas-sensing (GS) microchip loaded with three gas-sensitive materials was fabricated via a micromachining technique. Then, a portable gas detection system was built to collect the signals of the chip under various decomposition products of sulfur hexafluoride (SF
    Language English
    Publishing date 2021-03-01
    Publishing country England
    Document type Journal Article
    ISSN 2055-7434
    ISSN (online) 2055-7434
    DOI 10.1038/s41378-021-00246-1
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Recent Existence Results for Second-Order Singular Periodic Differential Equations

    Nieto JuanJ / Chu Jifeng

    Boundary Value Problems, Vol 2009, Iss 1, p

    2009  Volume 540863

    Abstract: We present some recent existence results for second-order singular periodic differential equations. A nonlinear alternative principle of Leray-Schauder type, a well-known fixed point theorem in cones, and Schauder's fixed point theorem are used in the ... ...

    Abstract We present some recent existence results for second-order singular periodic differential equations. A nonlinear alternative principle of Leray-Schauder type, a well-known fixed point theorem in cones, and Schauder's fixed point theorem are used in the proof. The results shed some light on the differences between a strong singularity and a weak singularity.
    Keywords Mathematics ; QA1-939 ; Science ; Q ; DOAJ:Mathematics ; DOAJ:Mathematics and Statistics
    Language English
    Publishing date 2009-01-01T00:00:00Z
    Publisher Springer
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Article: Highly selective detection of sulfur hexafluoride decomposition components H2S and SOF2 employing sensors based on tin oxide modified reduced graphene oxide

    Chu, Jifeng / Xiaohua Wang / Dawei Wang / Aijun Yang / Pinlei Lv / Yi Wu / Mingzhe Rong / Lei Gao

    Carbon. 2018 Aug., v. 135

    2018  

    Abstract: In this paper, a high-performance sensor based on tin oxide modified reduced graphene oxide (SnO2-rGO) has been prepared via a one-step hydrothermal process for the detection of sulfur hexafluoride (SF6) decomposition components H2S and SOF2. The ... ...

    Abstract In this paper, a high-performance sensor based on tin oxide modified reduced graphene oxide (SnO2-rGO) has been prepared via a one-step hydrothermal process for the detection of sulfur hexafluoride (SF6) decomposition components H2S and SOF2. The morphology and nanostructure of the product were characterized by X-ray diffraction (XRD), Raman spectroscopy (RS), scanning electron microscopy (SEM), and energy dispersive spectrometer (EDS). The gas sensing properties of SnO2-rGO nanocomposite were investigated by exposing to various target gases. The experimental results revealed that SnO2-rGO sensor exhibited better responses (34.31% and −3.13%) than those (5.97% and −1.45%) of pristine rGO sensor at the optimal temperature of 125 °C in the presentence 100 ppm H2S and 10 ppm SOF2, respectively. Meanwhile, SnO2-rGO sensor emerged as one of the promising candidate materials to select these two gases by yielding opposite response to H2S and SOF2. In addition, uniformity, repeatability, long-term stability of SnO2-rGO sensors were investigated to demonstrate the practicability, and the possible mechanism of SnO2-rGO nanocomposite for sensing H2S and SOF2 was discussed.
    Keywords Raman spectroscopy ; X-ray diffraction ; energy-dispersive X-ray analysis ; gases ; graphene oxide ; hydrogen sulfide ; nanocomposites ; nanomaterials ; scanning electron microscopy ; sulfur hexafluoride ; temperature
    Language English
    Dates of publication 2018-08
    Size p. 95-103.
    Publishing place Elsevier Ltd
    Document type Article
    ISSN 0008-6223
    DOI 10.1016/j.carbon.2018.04.037
    Database NAL-Catalogue (AGRICOLA)

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  7. Article ; Online: Short period sinusoidal thermal modulation for quantitative identification of gas species.

    Yang, Aijun / Chu, Jifeng / Li, Weijuan / Wang, Dawei / Yang, Xu / Lan, Tiansong / Wang, Xiaohua / Rong, Mingzhe / Koratkar, Nikhil

    Nanoscale

    2019  Volume 12, Issue 1, Page(s) 220–229

    Abstract: The field of chemical (gas) sensing has witnessed an unprecedented increase in device sensitivity with single molecule detection now becoming a reality. In contrast to this, the ability to distinguish or discriminate between gas species has lagged behind. ...

    Abstract The field of chemical (gas) sensing has witnessed an unprecedented increase in device sensitivity with single molecule detection now becoming a reality. In contrast to this, the ability to distinguish or discriminate between gas species has lagged behind. This is problematic and results in a high rate of false alarms. Here, we demonstrate a short period sinusoidal thermal modulation strategy to quantitatively and rapidly identify two industrially relevant gases (hydrogen sulfide (H
    Language English
    Publishing date 2019-12-09
    Publishing country England
    Document type Journal Article
    ZDB-ID 2515664-0
    ISSN 2040-3372 ; 2040-3364
    ISSN (online) 2040-3372
    ISSN 2040-3364
    DOI 10.1039/c9nr05863j
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article: Tellurene based chemical sensor

    Wang, Dawei / Chu, Jifeng / Fan, Chengyu / Koratkar, Nikhil / Lan, Tiansong / Liu, Zhu / Pan, Jianbin / Rong, Mingzhe / Wang, Xiaohua / Yang, Aijun / Yuan, Huan

    Journal of materials chemistry A. 2019 Nov. 26, v. 7, no. 46

    2019  

    Abstract: Chemiresistive sensor devices using two-dimensional (2D) materials have been extensively studied. However, so far no single material has all the desirable attributes. For example, graphene and MXenes lack a band gap, transition metal dichalcogenides ( ... ...

    Abstract Chemiresistive sensor devices using two-dimensional (2D) materials have been extensively studied. However, so far no single material has all the desirable attributes. For example, graphene and MXenes lack a band gap, transition metal dichalcogenides (such as MoS2) lack high sensitivity, while phosphorene exhibits poor air-stability. Here we report that tellurene, a new emergent single-element 2D material, excels as a sensor for NO2 detection. Devices based on tellurene exhibit a detection limit of ∼25 ppb, large detection range (from 25 ppb to 5 ppm), baseline noise as low as ∼0.5%, and excellent “selectivity” to NO2 even in the presence of cross-contaminants such as CO, SO2, H2S, acetone and ethanol. Density functional theory calculations indicate that large adsorption energy and intense charge redistribution are the reasons for the high sensitivity and selectivity of tellurene for NO2 detection. Further, we find that “heat-pulsing” enables fast sensor response and recovery time, without damaging the tellurene sheets. Most importantly, tellurene exhibits outstanding air-stability, making it a promising candidate for next-generation chemical sensors.
    Keywords acetone ; adsorption ; carbon monoxide ; density functional theory ; detection limit ; energy ; ethanol ; graphene ; hydrogen sulfide ; molybdenum disulfide ; nitrogen dioxide ; sulfur dioxide
    Language English
    Dates of publication 2019-1126
    Size p. 26326-26333.
    Publishing place The Royal Society of Chemistry
    Document type Article
    ZDB-ID 2702232-8
    ISSN 2050-7496 ; 2050-7488
    ISSN (online) 2050-7496
    ISSN 2050-7488
    DOI 10.1039/c9ta09429f
    Database NAL-Catalogue (AGRICOLA)

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