Experimental and theoretical studies of V2O5@TiO2 core-shell hybrid composites with high gas sensing performance towards ammonia

Fu, Haitao; Yang, Xiaohong; An, Xizhong; Fan, Weiren; Jiang, Xuchuan; Yu, Aibing

doi:10.1016/j.snb.2017.05.027

Cited by 70 publications

(27 citation statements)

References 55 publications

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“…Although V 2 O 5 nanoflakes show a larger specific surface area, the two values are comparable, while the sensitivity of V 2 O 5 in this work is about 10 times that of VO 2 (B). Moreover, V 2 O 5 always showed higher sensing performance to ammonia than VO 2 (B) in the previous literature [38,43,44,45]. Therefore, one reasonable explanation is that the intrinsic properties of V 2 O 5 determine its higher sensing performance.…”

Section: Resultsmentioning

confidence: 69%

Self-Assembled Vanadium Oxide Nanoflakes for p-Type Ammonia Sensors at Room Temperature

et al. 2019

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VO2(B), VO2(M), and V2O5 are the most famous compounds in the vanadium oxide family. Here, their gas-sensing properties were investigated and compared. VO2(B) nanoflakes were first self-assembled via a hydrothermal method, and then VO2(M) and V2O5 nanoflakes were obtained after a heat-phase transformation in nitrogen and air, respectively. Their microstructures were evaluated using X-ray diffraction and scanning and transmission electron microscopies, respectively. Gas sensing measurements indicated that VO2(M) nanoflakes were gas-insensitive, while both VO2(B) and V2O5 nanoflakes were highly selective to ammonia at room temperature. As ammonia sensors, both VO2(B) and V2O5 nanoflakes showed abnormal p-type sensing characteristics, although vanadium oxides are generally considered as n-type semiconductors. Moreover, V2O5 nanoflakes exhibited superior ammonia sensing performance compared to VO2(B) nanoflakes, with one order of magnitude higher sensitivity, a shorter response time of 14–22 s, and a shorter recovery time of 14–20 s. These characteristics showed the excellent potential of V2O5 nanostructures as ammonia sensors.

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Section: Resultsmentioning

confidence: 69%

Self-Assembled Vanadium Oxide Nanoflakes for p-Type Ammonia Sensors at Room Temperature

et al. 2019

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“…Exactly, the latter one is more trustable and solid results to support the mechanism study, e.g., in situ FTIR [183,184], in situ Kelvin probe [185], in situ STM [186,187], in situ TEM [188,189]). In addition, Theoretically studies (such as DFT simulation) [190], are also helpful for researchers to understand the interaction between the gas analyte and sensitive materials, the succedent electronic structure changes, or band gap regulation in heterojunction, or charge transfer, etc., which can guide the orientation of materials design [70,[190][191][192][193][194][195]. Otherwise, learning theoretical studies toward hybrid catalyst designs can inspire the further researches on hybrid gas sensing due to the similar surface physical/chemical science, band gap theories, and charge transfer process [196][197][198][199][200][201].…”

Section: Challenges and Perspectivesmentioning

confidence: 99%

Gas Sensors Based on Chemi-Resistive Hybrid Functional Nanomaterials

et al. 2020

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HIGHLIGHTS• This review gives a thinking based on the generic mechanisms rather than simply dividing them as different types of combination of materials, which is unique and valuable for understanding and developing the novel hybrid materials in the future.• The hybrid materials, their sensing mechanism, and their applications are systematically reviewed. Critical thinking and ideas regarding the orientation of the development of hybrid material-based gas sensor in the future are also discussed.ABSTRACT Chemi-resistive sensors based on hybrid functional materials are promising candidates for gas sensing with high responsivity, good selectivity, fast response/recovery, great stability/repeatability, room-working temperature, low cost, and easy-to-fabricate, for versatile applications. This progress report reviews the advantages and advances of these sensing structures compared with the single constituent, according to five main sensing forms: manipulating/constructing heterojunctions, catalytic reaction, charge transfer, charge carrier transport, molecular binding/sieving, and their combinations. Promises and challenges of the advances of each form are presented and discussed.Critical thinking and ideas regarding the orientation of the development of hybrid material-based gas sensor in the future are discussed.

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“…4(a)) could be assigned to (200), (001), (101), (110), and (301) lattice planes of V 2 O 5 [40]. After calcining in ammonia above 500 ℃, all the V 2 O 5 peaks disappear and the emerging peaks agree well with the (111), (200), (220), (311), and (222) diffraction peaks of cubic VN, indicating the successful fabrication of VN nanofibers via electrospinning [41,42]. The crystallite size of VN nanofibers is calculated by employing the Debye-Scherrer equation:…”

Section: Resultsmentioning

confidence: 65%

Electrospun polyporous VN nanofibers for symmetric all-solid-state supercapacitors

Zhang

et al. 2018

J Adv Ceram

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To promote the energy density of symmetric all-solid-state supercapacitors (SCs), efforts have been dedicated to searching for high-performance electrode materials recently. In this paper, vanadium nitride (VN) nanofibers with mesoporous structure have been fabricated by a facile electrospinning method. Their crystal structures and morphology features were characterized by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The mesoporous structure of VN nanofibers, which can provide short electrolyte diffusion routes and conducting electron transport pathways, is beneficial to their performance as a supercapacitor electrode. Under a stable electrochemical window of 1.0 V, VN nanofibers possess an excellent mass specific capacitance of 110.8 F/g at a scan rate of 5 mV/s. Moreover, the VN nanofibers were further assembled into symmetric all-solid-state SCs, achieving a high energy density of 0.89 mW•h/cm 3 and a high power density of 0.016 W/cm 3 over an operating potential range from 0 to 1.0 V. These results demonstrate that VN nanofibers could be potentially used for energy storage devices.

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Experimental and theoretical studies of V2O5@TiO2 core-shell hybrid composites with high gas sensing performance towards ammonia

Cited by 70 publications

References 55 publications

Self-Assembled Vanadium Oxide Nanoflakes for p-Type Ammonia Sensors at Room Temperature

Self-Assembled Vanadium Oxide Nanoflakes for p-Type Ammonia Sensors at Room Temperature

Gas Sensors Based on Chemi-Resistive Hybrid Functional Nanomaterials

Electrospun polyporous VN nanofibers for symmetric all-solid-state supercapacitors

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