Towards carbon monoxide sensors based on europium doped cerium dioxide

Ortega, P.P.; Rocha, L. S. R.; Cortés, Juan; Ramírez, M. A.; Buono, Camila; Ponce, Miguel Adolfo; Simões, Alexandre Zirpoli

doi:10.1016/j.apsusc.2018.09.142

Cited by 47 publications

(28 citation statements)

References 57 publications

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“…Quick measurement of CO concentration in the atmosphere is essential as this gas can cause death. A sensor that can swiftly response to the effects of CO has successfully been developed using Eu-doped Ceria film [19]. The use of laser as a sensor for CO has also been developed to reduce measurement noise and this system is capable of measuring CO concentration to as small as 2.4 ppm [20].…”

Section: Related Workmentioning

confidence: 99%

Real-time decision support system for carbon monoxide threat warning using online expert system

Suryono¹,

Surarso²,

Saputra³

et al. 2019

J Appl Eng Science

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This paper describes a decision support system to mitigate the danger that carbon monoxide pose via internet-based measurement. This system is required because in high concentration above threshold, carbon monoxide can trigger many diseases and even cause death. However, a system that is capable of detection and making online decision in real-time against that threat is not yet available. Therefore, decisions on carbon monoxide threat are often taken too late as they are made manually with expert analysis. This research proposes the design of a sensor node composed of a gas sensor, a microcontroller, a WIFI router, and an Internet modem to acquire data and communicate them via the internet. The pollution index value and rule-based algorithm, which are used to determine carbon monoxide gas pollution categories in the web server program, are in accordance to data stated in the Indonesia Air Pollutant Index. An expert system programming based on expert knowledge is then used to make decision on pollution. Results show that the sensor node built is capable of sending data online to the cloud station, with Root Mean Square Error of 3.46 µg/m 2 and relative error of 0.78% for a measurement range of 0-440 µg/m 2. This system is also capable of sending data fast with a transfer rate of 764 milliseconds. Further testing also revealed that using expert system in cloud computing results in speedy warning of carbon monoxide threat, at 15.6 seconds.

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Section: Related Workmentioning

confidence: 99%

Real-time decision support system for carbon monoxide threat warning using online expert system

Suryono¹,

Surarso²,

Saputra³

et al. 2019

J Appl Eng Science

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“…We have previously reported the optimization regarding the synthesis of pure CeO 2 , in terms of distinct mineralizer agents (2M KOH, NaOH, and NH 4 OH) 20 followed by the evaluation of the influence of distinct synthesis times (1, 2, 4 and 8 min) on its microstructural and photoluminescent (PL) properties 21 . Then, the modification with rare-earth elements was also studied with respect to the addition of Lanthanum [La(III)] species at 4, 8 and 12wt% in terms of XRD and Rietveld refinement, Raman, UV-Vis and PL spectroscopies along with SEM analysis 22 . The main goal of lanthanum addition was to induce the creation of defective species causing structural expansion 23 , resulting in the improvement of the gas sensing properties.…”

Section: +3mentioning

confidence: 99%

Experimental and ab Initio Studies of Deep-Bulk Traps in Doped Rare-Earth Oxide Thick Films

Rocha¹,

Schipani

Aldao

et al. 2019

J. Phys. Chem. C

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Lanthanum-doped CeO 2 is a promising semiconductor for gas sensing. A combined study applying impedance spectroscopy and first-principle calculations was performed for pure and lanthanum-doped samples. The results showed a strong influence of the localized Ce 4f states on the electrical conduction processes, and an electrical resistance increase, as a function of the exposure to vacuum and air atmospheres. After its modification with a rare-earth element along with exposure to reducing and oxidizing atmospheres, the observed behavior suggested the presence of multi-traps, which depended on the described equilibrium between the oxygen vacancies (V o

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“…This transition is permitted only in the absence of an inversion symmetry, so the uorescence associated with this hypersensitive transition in Eu 3+ has been used in metal complexes and metal-organic frameworks as sensors/biosensors. [39][40][41][42][43] The factors controlling uorescence from the Eu-CeO 2 nanoparticle morphology are the most thoroughly studied, 44,45 with less thorough investigation of Eu-CeO 2 lms, rods, and nanowires or ribbons. 33,34,38,[46][47][48] Emission is believed to initiate with excitation of the O 2À / Ce 4+ charge transfer band, followed by energy transfer to Eu 3+ and relaxation with emission of a photon.…”

Section: Introductionmentioning

confidence: 99%