Highly Sensitive Sensors Based on Metal-Oxide Nanocolumns for Fire Detection

Lee, Kwang Jae; Shim, Young Seok; Song, Young Geun; Han, Soo Deok; Lee, Youn Sung; Kang, Chong Yun

doi:10.3390/s17020303

Cited by 36 publications

(21 citation statements)

References 39 publications

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“…To ensure high response and reversible operation of chemiresistive gas sensors, high operating temperatures of 150–400 °C are inevitably required for adsorption and desorption of target molecules on and off of the sensing materials . However, this high temperature degrades the sensor stability and lifetime due to thermally induced grain growth, which can damage interconnected electronics . Moreover, high power consumption (over ≈100 mW) is required, which must be decreased for the development of future battery‐powered wireless sensors for applications to the IoT …”

Section: Introductionmentioning

confidence: 99%

Ionic‐Activated Chemiresistive Gas Sensors for Room‐Temperature Operation

Song

Shim

Suh

et al. 2019

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extensively studied because of their remarkable advantages including low cost, simple fabrication, high response, and easy integration with electronic circuits. To ensure high response and reversible operation of chemiresistive gas sensors, high operating temperatures of 150-400 °C are inevitably required for adsorption and desorption of target molecules on and off of the sensing materials. [3,4] However, this high temperature degrades the sensor stability and lifetime due to thermally induced grain growth, which can damage interconnected electronics. [5,6] Moreover, high power consumption (over ≈100 mW) is required, which must be decreased for the development of future battery-powered wireless sensors for applications to the IoT. [7] To design high performance gas sensors that operate at room temperature, a variety of approaches including self-heating, ultraviolet (UV)-assisted measurements, and 2D materials have been used for high stability and low power consumption. [8][9][10] Despite these extensive efforts, challenges remain including poor response and incomplete recovery because of the restricted modulation in electronic conductivity by insufficient reaction energy between the analytes and sensing materials. Recently, the utilization of humidity has been reported as an effective method for improving gas sensing performance at low temperatures.The development of high performance gas sensors that operate at room temperature has attracted considerable attention. Unfortunately, the conventional mechanism of chemiresistive sensors is restricted at room temperature by insufficient reaction energy with target molecules. Herein, novel strategy for room temperature gas sensors is reported using an ionic-activated sensing mechanism. The investigation reveals that a hydroxide layer is developed by the applied voltages on the SnO 2 surface in the presence of humidity, leading to increased electrical conductivity. Surprisingly, the experimental results indicate ideal sensing behavior at room temperature for NO 2 detection with sub-parts-per-trillion (132.3 ppt) detection and fast recovery (25.7 s) to 5 ppm NO 2 under humid conditions. The ionic-activated sensing mechanism is proposed as a cascade process involving the formation of ionic conduction, reaction with a target gas, and demonstrates the novelty of the approach. It is believed that the results presented will open new pathways as a promising method for room temperature gas sensors. Sensors/BiosensorsThe ORCID identification number(s) for the author(s) of this article can be found under https://doi.

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Section: Introductionmentioning

confidence: 99%

Ionic‐Activated Chemiresistive Gas Sensors for Room‐Temperature Operation

Song

Shim

Suh

et al. 2019

Small

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“…high specific surface [1,2], tunable density [3,4] or high pore connectivity [5,6]. These features make these films ideal candidates for applications in optical devices (due to their higher transparency [7]), plasmonics [8], electrical anisotropy [9], sensors [10,11], electrodes for solar cells [12] or biomedicine [13], among others.…”

Section: Introductionmentioning

confidence: 99%

Structural control in porous/compact multilayer systems grown by magnetron sputtering

et al. 2017

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In this work we analyze a phenomenon that takes place when growing magnetron sputtered porous/compact multilayer systems by alternating the oblique angle and the classical configuration geometries. We show that the compact layers develop numerous fissures rooted in the porous structures of the film below, in a phenomenon that amplifies when increasing the number of stacked layers. We demonstrate that these fissures emerge during growth due to the high roughness of the porous layers and the coarsening of a discontinuous interfacial region. To minimize this phenomenon, we have grown thin interlayers between porous and compact films under the impingement of energetic plasma ions, responsible for smoothing out the interfaces and inhibiting the formation of structural fissures. This method has been tested in practical situations for compact TiO2/porous SiO2 multilayer systems, although it can be extrapolated to other materials and conditions.

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“…Lee et al developed NiO, SnO 2 , WO 3 and In 2 O 3 NCs nanocolumns gas sensors using the glacing angle deposition technique (GLAF) [ 87 ]. The sensors were designed for fire detection.…”

Section: Fire Detectors Exclusively Based On Chemical Sensingmentioning

confidence: 99%

Chemical Sensor Systems and Associated Algorithms for Fire Detection: A Review

Fonollosa

Solórzano

Marco

2018

Sensors

120

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Indoor fire detection using gas chemical sensing has been a subject of investigation since the early nineties. This approach leverages the fact that, for certain types of fire, chemical volatiles appear before smoke particles do. Hence, systems based on chemical sensing can provide faster fire alarm responses than conventional smoke-based fire detectors. Moreover, since it is known that most casualties in fires are produced from toxic emissions rather than actual burns, gas-based fire detection could provide an additional level of safety to building occupants. In this line, since the 2000s, electrochemical cells for carbon monoxide sensing have been incorporated into fire detectors. Even systems relying exclusively on gas sensors have been explored as fire detectors. However, gas sensors respond to a large variety of volatiles beyond combustion products. As a result, chemical-based fire detectors require multivariate data processing techniques to ensure high sensitivity to fires and false alarm immunity. In this paper, we the survey toxic emissions produced in fires and defined standards for fire detection systems. We also review the state of the art of chemical sensor systems for fire detection and the associated signal and data processing algorithms. We also examine the experimental protocols used for the validation of the different approaches, as the complexity of the test measurements also impacts on reported sensitivity and specificity measures. All in all, further research and extensive test under different fire and nuisance scenarios are still required before gas-based fire detectors penetrate largely into the market. Nevertheless, the use of dynamic features and multivariate models that exploit sensor correlations seems imperative.

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Highly Sensitive Sensors Based on Metal-Oxide Nanocolumns for Fire Detection

Cited by 36 publications

References 39 publications

Ionic‐Activated Chemiresistive Gas Sensors for Room‐Temperature Operation

Ionic‐Activated Chemiresistive Gas Sensors for Room‐Temperature Operation

Structural control in porous/compact multilayer systems grown by magnetron sputtering

Chemical Sensor Systems and Associated Algorithms for Fire Detection: A Review

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