Sol-Gel Derived ZnO: Nb2O5 Nanocomposite as Selective Hydrogen (H2) Gas Sensor

Devi, G. Sarala; Reddy, P. Siva Prasada; Ramya, K.

doi:10.1016/j.matpr.2016.01.061

Cited by 16 publications

(4 citation statements)

References 9 publications

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“…[9] Accordingly, numerous studies have been reported in the literature about H2 sensing with ZnO. [10,11] Moreover, this oxide can be easily synthesized in a variety of relevant morphologies such as networked nanowires (NWs), [12] yielding faster response and superior sensitivity to the target gas in comparison with other NWs configurations. [13] Nevertheless networked ZnO NWs often suffer from poor selectivity, which is defined as the ability of a sensor to respond to a specific gas in the presence of a gas mixture.…”

Section: Introductionmentioning

confidence: 99%

Design and fabrication of highly selective H2 sensors based on SIM-1 nanomembrane-coated ZnO nanowires

Drobek

Kim

Bechelany

et al. 2018

Sensors and Actuators B: Chemical

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High quality hydrogen sensors are of an utmost importance in many industrial applications to efficiently address the safety issues concerning the production, delivering, storage and use of H2 gas. Recently a special effort has been devoted to modification of semiconductor metal oxides in order to improve their gas sensing characteristics. In this context here we report on the preparation of a novel ZnO-based semiconductor sensor modified by a thin SIM-1 hydrogen selective membrane serving as an efficient molecular sieving layer. Compared to pristine ZnO sensors, the optimized SIM-1 coated ZnO nanowires showed remarkable selectivity towards H2 at high temperatures (300 °C) in the presence of numerous interfering 2 gases (CH3COCH3, CH4, C7H8, C2H5OH and C6H6) thus confirming the efficiency of such sensor material for hydrogen detection.

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Section: Introductionmentioning

confidence: 99%

Design and fabrication of highly selective H2 sensors based on SIM-1 nanomembrane-coated ZnO nanowires

Drobek

Kim

Bechelany

et al. 2018

Sensors and Actuators B: Chemical

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“…Một dạng cảm biến khí H2 thông dụng dựa trên oxide kim loại [136]. Trong số đó, cảm biến dựa trên ZnO có đặc tính cảm biến rất tốt do tính linh động cao của chất mang điện tử và khoảng cách vùng cấm lớn (3,37 eV) [137], đã được công bố [138,139]. Tuy nhiên, cảm biến dựa trên ZnO thường có tính chọn lọc kém [136].…”

Section: ứNg Dụng Zn(almim)2 Làm Vật Liệu Cảm Biếnunclassified

The Me(almIM)<sub>2</sub> structural ZIFs: Synthesis, characterization and application

Ta Ngoc Don,

Le Van Duong,

Nguyen Thi Hong Phuong

et al. 2024

Vietnam j. catal. adsorp.

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The Me(almIM)2 structural ZIFs are formed from the metal ions Me2+ and the linker 4-methyl-5-imidazolecarboxaldehyde (HalmIM), with the Me–almIM–Me bond angle similar to the Si–O–Si angle in zeolites (145o). Depending on the type of bond formed, Me(almIM)2 material has RHO or SOD structure with good thermal and chemical stability. With pore diameter of about 3.0-3.7 Å connected to large cavities with sizes from 9.1-17.9 Å and a structural frameworks containing two groups –CH3 and –CHO with hydrophilic properties, when the –CHO groups is modified by amine groups through imine condensation reaction, we can create hydrophobic materials for diverse applications in adsorption, separation, sensing, biomedical and catalysis. This review report collects results from more than 100 research papers related to Me(almIM)2 from 2010 to present and provides some recommendations on their synthesis, characterization and application in the future.

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“…The enhanced sensing performance can be attributed to the unique interconnected nanoparticles with a nanorod structure, abundant mesopores, larger specific surface area and more oxygen vacancies as well as the formation of a large number of α-Fe 2 O 3 /Nb 2 O 5 n-n heterojunctions. The extensively exposed heterostructure benefits from retaining a large number of target gas molecules and reaction sites onto the sensor surface, which accelerates the rod-particle-like nanostructures surface-reaction species and brings the superiority of the geometrical and electronic effects into full play to facilitate the generation of more reactive chemisorbed oxygen species on the surface of the Hence, small size, large surface area, abundant oxygen species and the synergic effect of the n-n heterojunction between Nb 2 O 5 (INP) and α-Fe 2 O 3 (NR) are the major constituents of superior sensitivity and enhanced gas-sensing behavior of the sensor based on the α-Fe 2 O 3 (0.09)/Nb 2 O 5 heterostructure [70,71]. Here, we have also presented data from different reported studies for comparison with our work, confirming that our work is better, as shown in table 1.…”

Section: Gas-sensing Propertiesmentioning

confidence: 99%

Design of highly sensitive and selective ethanol sensor based on α-Fe₂O₃/Nb₂O₅ heterostructure

Khatoon

Rauf²,

Haq³

et al. 2021

Nanotechnology

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The introduction of heterostructures is a new approach in gas sensing due to their easy and quick transport of charges. Herein, facile hydrothermal and solid-state techniques are employed to synthesize an α-Fe2O3/Nb2O5 heterostructure. The morphology, microstructure, crystallinity and surface composition of the synthesized heterostructures are investigated by scanning electron microscope, transmission electron microscope, x-ray diffraction, x-ray photoelectron spectroscopy and Brunauer–Emmett–Teller analyses. The successful fabrication of the heterostructures was achieved via the mutual incorporation of α-Fe2O3 nanorods with Nb2O5 interconnected nanoparticles (INPs). A sensor based on the α-Fe2O3(0.09)/Nb2O5 heterostructure with a high surface area exhibited enhanced gas-sensing features, maintaining high selectivity and sensitivity, and a considerable recovery percentage towards ethanol gas. The sensing response of the α-Fe2O3(0.09)/Nb2O5 heterostructure at lower operating temperature (160 °C) is around nine times higher than a pure Nb2O5 (INP) sensor at 180 °C with the flow of 100 ppm ethanol gas. The sensors also show excellent selectivity, good long-term stability and a rapid response/recovery time (8s/2s, respectively) to ethanol. The superior electronic conductivity and upgraded sensitivity performance of gas sensors based on the α-Fe2O3(0.09)/Nb2O5 heterostructure are attributed due to its unique structural features, high specific surface area and the synergic effect of the n–n heterojunction. The promising results demonstrate the potential application of the α-Fe2O3(0.09)/Nb2O5 heterostructure as a good sensing material for the fabrication of ethanol sensors.

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Sol-Gel Derived ZnO: Nb2O5 Nanocomposite as Selective Hydrogen (H2) Gas Sensor

Cited by 16 publications

References 9 publications

Design and fabrication of highly selective H2 sensors based on SIM-1 nanomembrane-coated ZnO nanowires

Design and fabrication of highly selective H2 sensors based on SIM-1 nanomembrane-coated ZnO nanowires

The Me(almIM)<sub>2</sub> structural ZIFs: Synthesis, characterization and application

Design of highly sensitive and selective ethanol sensor based on α-Fe₂O₃/Nb₂O₅ heterostructure

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Sol-Gel Derived ZnO: Nb2O5 Nanocomposite as Selective Hydrogen (H2) Gas Sensor

Cited by 16 publications

References 9 publications

Design and fabrication of highly selective H2 sensors based on SIM-1 nanomembrane-coated ZnO nanowires

Design and fabrication of highly selective H2 sensors based on SIM-1 nanomembrane-coated ZnO nanowires

The Me(almIM)<sub>2</sub> structural ZIFs: Synthesis, characterization and application

Design of highly sensitive and selective ethanol sensor based on α-Fe2O3/Nb2O5 heterostructure

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Design of highly sensitive and selective ethanol sensor based on α-Fe₂O₃/Nb₂O₅ heterostructure