Synthesis of Cr2O3 Nanoparticle-Coated SnO2 Nanofibers and C2H2 Sensing Properties

Gao, Xin; Zhou, Qu; Lu, Zhaorui; Xu, Lingna; Zhang, Qingyan; Zeng, Wen

doi:10.3389/fmats.2019.00163

Cited by 18 publications

(9 citation statements)

References 42 publications

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“…The combination of Cr 2 O 3 with the commonly used n-type SnO 2 is a promising solution. SnO 2 and Cr 2 O 3 CSNs reportedly show a good p-type response to acetylene . The addition of SnO 2 to Cr 2 O 3 is, also, reported to increase the response to ethanol …”

Section: Introductionmentioning

confidence: 92%

Dominant Role of Heterojunctions in Gas Sensing with Composite Materials

Staerz

Gao

Cetmi

et al. 2020

ACS Appl. Mater. Interfaces

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It is well known that composite materials, consisting of at least two metal oxides, show qualities and sensing behavior very different from the single components. Recently, the preparation of core–shell nanomaterials for gas sensors has become extremely popular. Specifically, these materials have been found to show desirable sensor responses. The preparation of core–shell nanomaterials is, however, complex, limiting the commercial applicability. Composite materials can be more easily attained simply through the mechanical mixing of the various components. Although some studies exist that attempt to compare mechanically mixed composites to those prepared via a synthetic route, these examinations are often flawed, as due to varying preparation methods, the basic characteristics of the materials are not the same. Here, it was possible to separate the role of the contacts between the materials from that of the secondary core–shell structure, by using a soft method to mechanically break apart the structure. This ensures that the difference in morphology is the only change in the material characteristics. It was verified that the composite materials show a different sensing behavior from that of the pure materials. It was also found that regardless of the secondary structure, the composite materials showed very similar sensor responses. By examining materials containing different ratios of Cr2O3 to SnO2, it was possible to attribute the sensor behavior changes to the contacts between the different metal oxides. It was shown that by varying the concentration of each oxide it is possible to attain either an n- or p-type response and at a certain concentration even no response. This work is significant because it identifies that the contact between the materials plays the dominant role in the sensor response and it shows the viability of mechanical mixing for composite sample preparation.

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Section: Introductionmentioning

confidence: 92%

Dominant Role of Heterojunctions in Gas Sensing with Composite Materials

Staerz

Gao

Cetmi

et al. 2020

ACS Appl. Mater. Interfaces

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“…Semiconducting metal oxide-(SMOX-) based sensors are small, robust, inexpensive, and sensitive and easy to produce, making them highly attractive for handheld portable medical diagnostic detectors [110,111]. They have been used to produce highly sensitive gas sensors mainly because of their good chemical reliability, real-time monitoring, and easy fabrication [112]. For example, a 3D nanoheterojunction layout of nickel oxide-zinc oxide (NiO-Zn) p-n semiconductors with a grain size of ≈20 nm nanometers and a porosity of ≈98% for the rapid room temperature chemical sensing of volatile organic compounds has been reported by Chen and coworkers [113].…”

Section: Metal Oxide Nanostructures In Sensorsmentioning

confidence: 99%

“…coated SnO 2 NFs.) synthesized using a sol-gel process and an electrospinning method and characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), X-ray energy dispersive spectroscopy (EDS), and X-ray photoelectron spectroscopy (XPS) [112]. The Cr2O3 NPs.…”

Section: Metal Oxide Nanostructures In Sensorsmentioning

confidence: 99%

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Design and Synthesis of Nanostructured Materials for Sensor Applications

Noah

2020

Journal of Nanomaterials

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There has been an increasing demand for the development of sensor devices with improved characteristics such as sensitivity, low cost, faster response, reliability, rapider recovery, reduced size, in situ analysis, and simple operation. Nanostructured materials have shown great potential in improving these properties for chemical and biological sensors. There are different nanostructured materials which have been used in manufacturing nanosensors which include nanoscale wires (capability of high detection sensitivity), carbon nanotubes (very high surface area and high electron conductivity), thin films, metal and metal oxide nanoparticles, polymer, and biomaterials. This review provides different methods which have been used in the synthesis and fabrication of these nanostructured materials followed by an extensive review of the recent developments of metal, metal oxides, carbon nanotubes, and polymer nanostructured materials in sensor applications.

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“…To date, the number of oil-immersed transformers accounts for more than 90% of the total number of power transformers, and the operating state of these power transformers will directly affect the condition of power systems (Zhou et al, 2016;. For a long-running transformer, partial overheating and partial discharge will lead to the decomposition of transformer oil into a variety of fault gases, namely hydrogen (H 2 ), carbon monoxide (CO), carbon dioxide (CO 2 ), methane (CH 4 ), acetylene (C 2 H 2 ), ethylene (C 2 H 4 ), and ethane (C 2 H 6 ) (Jin et al, 2017;Gao et al, 2019;Park et al, 2019;Wang J. X. et al, 2019). Hence, the detection of these fault characteristic gases has been extensively applied to diagnose early latent faults and evaluate the operation quality of oil-immersed transformers (Zhang et al, 2018a;Cui et al, 2019;Gui et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Application of WO3 Hierarchical Structures for the Detection of Dissolved Gases in Transformer Oil: A Mini Review

Wei

Peng

et al. 2020

Front. Chem.

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Oil-immersed power transformers are considered to be one of the most crucial and expensive devices used in power systems. Hence, high-performance gas sensors have been extensively explored and are widely used for detecting fault characteristic gases dissolved in transformer oil which can be used to evaluate the working state of transformers and thus ensure the reliable operation of power grids. Hitherto, as a typical n-type metal-oxide semiconductor, tungsten trioxide (WO 3) has received considerable attention due to its unique structure. Also, the requirements for high quality gas detectors were given. Based on this, considerable efforts have been made to design and fabricate more prominent WO 3 based sensors with higher responses and more outstanding properties. Lots of research has focused on the synthesis of WO 3 nanomaterials with different effective and controllable strategies. Meanwhile, the various morphologies of currently synthesized nanostructures from 0-D to 3-D are discussed, along with their respective beneficial characteristics. Additionally, this paper focused on the gas sensing properties and mechanisms of the WO 3 based sensors, especially for the detection of fault characteristic gases. In all, the detailed analysis has contributed some beneficial guidance to the exploration on the surface morphology and special hierarchical structure of WO 3 for highly sensitive detection of fault characteristic gases in oil-immersed transformers.

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Synthesis of Cr2O3 Nanoparticle-Coated SnO2 Nanofibers and C2H2 Sensing Properties

Cited by 18 publications

References 42 publications

Dominant Role of Heterojunctions in Gas Sensing with Composite Materials

Dominant Role of Heterojunctions in Gas Sensing with Composite Materials

Design and Synthesis of Nanostructured Materials for Sensor Applications

Application of WO3 Hierarchical Structures for the Detection of Dissolved Gases in Transformer Oil: A Mini Review

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