Characteristics of ZnO nanorods-based ammonia gas sensors with a cross-linked configuration

Chen, Tai You; Chen, Huey Ing; Hsu, Chi Shiang; Huang, Chien Chang; Wu, Jiansheng; Chou, Po-Cheng; Liu, Wen Chau

doi:10.1016/j.snb.2015.06.122

Cited by 110 publications

(20 citation statements)

References 43 publications

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“…Currently, sensors for monitoring trace gases are imported from other countries and are highly costly. As per current literature, ZnO thin film-based gas sensors show promising results as sensors for atmospheric gases [5,[15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 58%

Al-Sn doped ZnO thin film nanosensor for monitoring NO₂ concentration

Sharma¹,

William²,

Thiruramanathan³

et al. 2017

Journal of Taibah University for Science

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The metal oxide semiconductor gas sensor technology is robust and has quick response times. In this work, aluminium and tin codoped zinc oxide (ASZO) thin films were synthesized by a sol-gel dip-coating process as sensors for the greenhouse gas nitrogen dioxide (NO 2). The prepared ASZO thin films were characterized using such techniques as X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM) and photoluminescence (PL) emission studies in order to analyze the elemental confirmation, particle size, surface roughness and optical emission properties, respectively. The XRD data reveals the hexagonal structure of ASZO and that the preferential orientation is along 2θ = 36.19 •. SEM images of the ASZO thin film exhibit rod-like formations of ASZO on the substrate. The ASZO films show enhanced sensing behaviour, sensing NO 2 gas even at 2 ppm at an operating temperature of 170 • C. The response and recovery times were determined to be 30 and 20 s, respectively.

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Section: Introductionmentioning

confidence: 58%

Al-Sn doped ZnO thin film nanosensor for monitoring NO₂ concentration

Sharma¹,

William²,

Thiruramanathan³

et al. 2017

Journal of Taibah University for Science

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“…The reliability of these types of sensors has great impact and relevance in issues where hazardous gases can be detected efficiently in such environments that involve deployment of human resources. Most of the thin film based gas sensors reported earlier are electrical signal based and would need a peripheral arrangement for detection of the gas 4–6 . It is envisaged that if a color change sensor can be made where a visual detection can detect the hazardous gas in ppm level that would make it extremely easy to use as well as cost effective as it would need no electronics peripheral as well as need of trained operator can be obliterated and it will also be maintenance free.…”

Section: Introductionmentioning

confidence: 99%

“…Detection of the presence of NH 3 at a low level is most desirable as the presence of the gas can occur in several areas like refrigeration, food processing and storage, fertilizers, environmental protection, chemical technology, ammonification by nitrogen cycle etc. Generally, an acceptable level of NH 3 gas is 8-h exposure limit at 25 ppm and a short-term (15 min) exposure level at 35 ppm 4–6,8 . Sustained exposure may cause severe problem on human health.…”

Section: Introductionmentioning

confidence: 99%

Fast response paper based visual color change gas sensor for efficient ammonia detection at room temperature

Maity

Ghosh

2018

Sci Rep

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We show that a cheap, disposable type rapid paper sensor (working at room temperature) can be made using perovskite halide CH3NH3PbI3 (MAPI) to detect presence of the toxic ammonia gas (NH3)by just color change, where the black colored MAPI film (on the paper) changes to yellow color in presence of a very low concentration of NH3 gas. The sensor can detect presence of NH3 gas in open or closed atmosphere down to around 10 ppm with a response time of nearly 10 sec which decreases to few seconds when the concentration exceeds 20 ppm. The easy to fabricate sensor paper being a visual sensor does not need any other extra equipment for its operation. The sensor is not sensitive to moisture with RH upto 90% and does not also respond to gases like Methane (CH4), Nitrous Oxide (N2O), Carbon dioxide (CO2) etc in the test chamber each up to a concentration of 500 ppm. Conversion/decomposition of MAPI to PbI2 on exposure to NH3 has been proposed as the mechanism of color change and the mechanism has been established using a collection of techniques like XRD, EDX, UV-Visible absorption and Photo Luminescence.

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“…Nanoscaled ZnO can provide an abundance of H 2 absorption sites because of its large surface area. [6,7] However,Z nO sensors show poor H 2 selectivity because they respond to many types of gases, including H 2, [6][7][8] CO, [6,7] C 2 H 5 OH, [9] NH 3 , [10] and NO 2 . [11] Functional materials are integrated intot he ZnO sensors to overcomet his disadvantage, for example, through the use of Pd films to cover ZnO surfaces and enhance H 2 selectivity.…”

Section: Introductionmentioning

confidence: 99%

A Designed ZnO@ZIF‐8 Core–Shell Nanorod Film as a Gas Sensor with Excellent Selectivity for H₂ over CO

Xiong

Mao

et al. 2017

Chemistry A European J

115

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Abstract:The development of H 2 gas sensors is important for H 2 production as af uel. In this work, aZ nO@ZIF-8c oreshell nanorod film is designed and synthesized as ag as sensor through af acile solutiond eposition process. This film shows an excellent selective response for H 2 over CO. By fine-tuning the reaction conditions, aZ nO@ZIF-8 core-shell structure with at hin, fine-grain, porousZ IF-8 shell is obtained. Owing to the facile H 2 penetration through the ZIF-8 thin shell ( % 110nm) and the increased oxygen vacancies for the complex film, the ZnO@ZIF-8 nanorod film shows ah igher H 2 sensitivity than ar aw ZnO nanorod film. More importantly,t he ZnO@ZIF-8 nanorod film shows no response for CO at 200 8C. Because of the fine-grain confinemento f the porous ZIF-8 shell (< 140 nm), the molecular sieving effect is strengthened, which allows the effective separation of H 2 over CO. This work providesapromising strategy for the design of high-performance H 2 sensors.

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Characteristics of ZnO nanorods-based ammonia gas sensors with a cross-linked configuration

Cited by 110 publications

References 43 publications

Al-Sn doped ZnO thin film nanosensor for monitoring NO₂ concentration

Al-Sn doped ZnO thin film nanosensor for monitoring NO₂ concentration

Fast response paper based visual color change gas sensor for efficient ammonia detection at room temperature

A Designed ZnO@ZIF‐8 Core–Shell Nanorod Film as a Gas Sensor with Excellent Selectivity for H₂ over CO

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Characteristics of ZnO nanorods-based ammonia gas sensors with a cross-linked configuration

Cited by 110 publications

References 43 publications

Al-Sn doped ZnO thin film nanosensor for monitoring NO2 concentration

Al-Sn doped ZnO thin film nanosensor for monitoring NO2 concentration

Fast response paper based visual color change gas sensor for efficient ammonia detection at room temperature

A Designed ZnO@ZIF‐8 Core–Shell Nanorod Film as a Gas Sensor with Excellent Selectivity for H2 over CO

Contact Info

Product

Resources

About

Al-Sn doped ZnO thin film nanosensor for monitoring NO₂ concentration

Al-Sn doped ZnO thin film nanosensor for monitoring NO₂ concentration

A Designed ZnO@ZIF‐8 Core–Shell Nanorod Film as a Gas Sensor with Excellent Selectivity for H₂ over CO