An efficient hydrogen gas sensor based on hierarchical Ag/ZnO hollow microstructures

Agarwal, Sunita; Kumar, Sanjay; Agrawal, Himanshu; Moinuddin, Mohamad G.; Kumar, Manoj; Sharma, Satinder K.; Awasthi, Kamlendra

doi:10.1016/j.snb.2021.130510

Cited by 96 publications

(32 citation statements)

References 53 publications

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“…STN 1.5 650 performed better than several semiconductors, including highly accredited materials such as SnO 2 and Pddecorated and Co-doped SnO 2 , 50−52 WO 3 , 53 CuO, 54 WO 3 − CuO junction, 53 ZnO, and Ag-doped ZnO. 55 Moreover, its experimental LOD of 0.4 ppm was far lower than that reported in some recently accredited works. 52,53 As far as our knowledge is concerned, the best experimental result regarding H 2 sensing was obtained by Wang et al, 51 recording a LOD of 0.25 ppm at R air /R gas = 3.…”

Section: ■ Experimental Sectionmentioning

confidence: 86%

Design of a Metal-Oxide Solid Solution for Sub-ppm H₂ Detection

et al. 2022

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Hydrogen is largely adopted in industrial processes and is one of the leading options for storing renewable energy. Due to its high explosivity, detection of H 2 has become essential for safety in industries, storage, and transportation. This work aims to design a sensing film for high-sensitivity H 2 detection. Chemoresistive gas sensors have extensively been studied for H 2 monitoring due to their good sensitivity and low cost. However, further research and development are still needed for a reliable H 2 detection at sub-ppm concentrations. Metal-oxide solid solutions represent a valuable approach for tuning the sensing properties by modifying their composition, morphology, and structure. The work started from a solid solution of Sn and Ti oxides, which is known to exhibit high sensitivity toward H 2 . Such a solid solution was empowered by the addition of Nb, which—according to earlier studies on titania films—was expected to inhibit grain growth at high temperatures, to reduce the film resistance and to impact the sensor selectivity and sensitivity. Powders were synthesized through the sol–gel technique by keeping the Sn–Ti ratio constant at the optimal value for H 2 detection with different Nb concentrations (1.5–5 atom %). Such solid solutions were thermally treated at 650 and 850 °C. The sensor based on the solid solution calcined at 650 °C and with the lowest content of Nb exhibited an extremely high sensitivity toward H 2 , paving the way for H 2 ppb detection. For comparison, the response to 50 ppm of H 2 was increased 6 times vs SnO 2 and twice that of (Sn,Ti) x O 2 .

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Section: ■ Experimental Sectionmentioning

confidence: 86%

Design of a Metal-Oxide Solid Solution for Sub-ppm H₂ Detection

et al. 2022

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“…However, less emphasis is given to developing pristine ZnO NRs, i.e., without its doping and functionalization. Some reports, for example, Agarwal et al, 26 showed that pristine ZnO NRs do not show any significant hydrogen response up to 150 °C and 300 ppm gas concentration, which further increases with increasing temperature after silver “Ag” modification. Cheng et al 27 showed 1.7% hydrogen gas response on ZnO at a relatively higher temperature (∼250 °C) and 15 ppm gas concentration, which further improved to ∼4.8% after decorating with Pt on ZnO NRs.…”

Section: Introductionmentioning

confidence: 99%

Low-Temperature Highly Robust Hydrogen Sensor Using Pristine ZnO Nanorods with Enhanced Response and Selectivity

et al. 2022

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We report the hydrogen-sensing response on low-cost-solution-derived ZnO nanorods (NRs) on a glass substrate, integrated with aluminum as interdigitated electrodes (IDEs). The hydrothermally grown ZnO NRs on ZnO seed-layer-glass substrates are vertically aligned and highly textured along the c -axis (002 plane) with texture coefficient ∼2.3. An optimal hydrogen-sensing response of about 21.46% is observed for 150 ppm at 150 °C, which is higher than the responses at 100 and 50 °C, which are ∼12.98 and ∼10.36%, respectively. This can be attributed to the large surface area of ∼14.51 m 2 /g and pore volume of ∼0.013 cm 3 /g, associated with NRs and related defects, especially oxygen vacancies in pristine ZnO nanorods. The selective nature is investigated with different oxidizing and reducing gases like NO 2 , CO, H 2 S, and NH 3 , showing relatively much lower ∼4.28, 3.42, 6.43, and 3.51% responses, respectively, at 50 °C for 50 ppm gas concentration. The impedance measurements also substantiate the same as the observed surface resistance is initially more than bulk, which reduces after introducing the hydrogen gas during sensing measurements. The humidity does not show any significant change in the hydrogen response, which is ∼20.5 ± 1.5% for a large humidity range (from 10 to 65%). More interestingly, the devices are robust against sensing response, showing no significant change after 10 months or even more.

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“…При этом морфология чувствительных слоев может быть очень разнообразна. Чувствительные слои могут состоять из наночастиц [17][18][19], наностержней [20,21], нановолокон [22], нанотрубок [23], нанопластин [24], различных иерархических структур [25]. Отдельно следует отметить интенсивные многообещающие исследования, направленные на использование 2D-материалов в качестве адсорбционных газовых сенсоров [26].…”

Section: Introductionunclassified

Газочувствительность Наноструктурированных Покрытий На Основе Наностержней Оксида Цинка При Комбинированной Активации

Рябко¹,

Бобков²,

Налимова³

et al. 2022

Журнал Технической Физики

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This paper presents a study of the gas sensitivity of a nanostructured zinc oxide coating to isopropyl alcohol vapor during heating, ultraviolet irradiation, as well as simultaneous heating and irradiation. Simultaneous heating to 150 °C and ultraviolet irradiation ensures an increase in the sensor layer response. A 10-fold decrease in the power consumption of an ultraviolet light-emitting diode results in a 1.2-fold decrease in the response of the sensor coating. Reducing the operating temperature of a gas sensor with low power consumption and achieving the required sensitivity can provide adsorption sensors integration into portable devices for monitoring ambient air quality.

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An efficient hydrogen gas sensor based on hierarchical Ag/ZnO hollow microstructures

Cited by 96 publications

References 53 publications

Design of a Metal-Oxide Solid Solution for Sub-ppm H₂ Detection

Design of a Metal-Oxide Solid Solution for Sub-ppm H₂ Detection

Low-Temperature Highly Robust Hydrogen Sensor Using Pristine ZnO Nanorods with Enhanced Response and Selectivity

Газочувствительность Наноструктурированных Покрытий На Основе Наностержней Оксида Цинка При Комбинированной Активации

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An efficient hydrogen gas sensor based on hierarchical Ag/ZnO hollow microstructures

Cited by 96 publications

References 53 publications

Design of a Metal-Oxide Solid Solution for Sub-ppm H2 Detection

Design of a Metal-Oxide Solid Solution for Sub-ppm H2 Detection

Low-Temperature Highly Robust Hydrogen Sensor Using Pristine ZnO Nanorods with Enhanced Response and Selectivity

Газочувствительность Наноструктурированных Покрытий На Основе Наностержней Оксида Цинка При Комбинированной Активации

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Design of a Metal-Oxide Solid Solution for Sub-ppm H₂ Detection

Design of a Metal-Oxide Solid Solution for Sub-ppm H₂ Detection