Gas sensor based on nanoporous hematite nanoparticles: Effect of synthesis pathways on morphology and gas sensing properties

Cuong, Nguyen Duc; Hòa, Trần Thái; Khiếu, Đinh Quang; Hòa, Nguyễn Đức; Hieu, Nguyen Van

doi:10.1016/j.cap.2012.03.026

Cited by 48 publications

(19 citation statements)

References 22 publications

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“…As it is well known, the sensor response is determined by the adsorption-desorption kinetics. Nanostructure decreases the diffusion length of molecules from the surface into the bulk and also enlarges the surface area, which efficiently accelerates the transition process and apparently increases the active sites for gas response [28]. The increased electron and hole diffusion rate to the surface of the nano-device allows the response rapidly.…”

Section: Gas Sensing Propertymentioning

confidence: 99%

Preparation of gas sensing CoTiO3 nanocrystallites using EDTA as the chelating agent in a sol–gel process

Jiang

Zhang

et al. 2015

Ceramics International

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Section: Gas Sensing Propertymentioning

confidence: 99%

Preparation of gas sensing CoTiO3 nanocrystallites using EDTA as the chelating agent in a sol–gel process

Jiang

Zhang

et al. 2015

Ceramics International

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“…The adsorption and gas-sensing characteristics of the CO2 and CO molecules on α-Fe2O3 nano-thin film matrix were investigated in the presence and absence of pre-adsorbed oxygen molecules using the density functional theory (DFT) method [24]. Additionally, the performance of α-Fe2O3 nanoparticles in the detection of flammable and toxic gases was investigated [25]. As described above, the ferricoxide gas sensors measured the change of electrical conductivity in the presence of a target gas.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Optical Oxygen Sensing Properties of [Ru(bpy)3]2+- Based Composites Along With Maghemite and Ionic Liquid

Oğuzlar¹,

Ongun²

2019

NWSA

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In this study, we measured oxygen-induced emission and decaytime data of tris(2,2′-bipyridyl)ruthenium(II) chloride dye in the presence of additives, maghemite and ionic liquid, 1-butyl-3methylimidazolium tetrafluoroborate. The fluorescent dye along with the additives was embedded in ethylcellulose matrix that was used as supporting material in form of thin-film and electrospun mat. The synthesized maghemite was used to enhance the oxygen sensitivity and linear working range of the dye. Ionic liquid (IL) was used to increase the stability and sensitivity of the sensing fluorophore. Together with the additives ruthenium dye-based composites exhibited higher Stern-Volmer constant (KSV), relative signal change and larger linear response. High relative signal change and KSV values mean that fluorophore has a better oxygen gas sensitivity.Stern-Volmer values of thin-film and microporous mats were found 1.64×10 −2 and 2.21×10 −2 , the relative signal changes (I0/I) were calculated as 2.64 and 3.21, respectively. There is no previous work about the utilization of both maghemite and ionic liquid additives together for the enhancement of oxygen sensitivity of the ruthenium.

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“…El óxido de hierro en su forma de hematita es un semiconductor tipo n, que detecta la presencia de gases reductores como metano, propano, amoniaco, por el cambio de conductividad eléctrica, debido a los mecanismos de oxidación superficial en los que se produce el intercambio de cargas [2][3][4][5][6] . Lamentablemente, este sensor es poco selectivo por sí solo; sin embargo, la adición de algún metal noble activo como el Pt, Pd y Ag ha permitido mejorar la selectividad del sensor hacia algunos gases, como CO 7 , H 2 S [8][9][10][11] , debido a efectos electrónicos y químicos, que se refleja en una mejora de la sensibilidad y la reducción de las temperaturas de operación [12][13][14][15] .…”

Section: Introductionunclassified

PREPARACIÓN DE SENSORES BASADOS EN ÓXIDO DE Fe DOPADOS CON Pt PARA LA DETECCIÓN DE METANO

Picasso¹,

Balboa²,

Sun-Kou

2015

rsqp

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Sensores basados en nanopartículas de α-Fe2O3 (hematita) puras y dopadas con Pt concargas de 0,1; 0,2 y 0,3% (peso respecto del óxido) fueron preparados por el método decoprecipitación para la detección de metano, usando carbonato de sodio como agenteprecipitante y polietilenglicol (PEG) como antiaglomerante. Las muestras fueroncaracterizadas por difracción de rayos X (XRD), sorción de N2 (método BET) y microscopíaelectrónica de transmisión (TEM). Los difractogramas de rayos X de las muestras hancorrespondido mayoritariamente a la fase α-hematita. La introducción del Pt como dopanteno ha modificado la estructura del óxido de partida. Todos los sensores han presentadoisotermas micro-mesoporosas tipo IV. Según las micrografías TEM, las nanopartículas hansido heterogéneas con tamaños entre 50 a 150 nm. Los tests catalíticos fueron realizados conconcentraciones de 300 a 900 ppm de metano y temperaturas de trabajo de 150 a 400 °C. Elsensor con 0,3% de Pt y con 0,3% de PEG (20000) mostró la más alta señal de respuesta,para 900 ppm de metano a 300 °C, debido probablemente a una buena formación de la fasecristalina, buena dispersión de las nanopartículas y por presentar la más alta superficie decontacto del material sensor.

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Gas sensor based on nanoporous hematite nanoparticles: Effect of synthesis pathways on morphology and gas sensing properties

Cited by 48 publications

References 22 publications

Preparation of gas sensing CoTiO3 nanocrystallites using EDTA as the chelating agent in a sol–gel process

Preparation of gas sensing CoTiO3 nanocrystallites using EDTA as the chelating agent in a sol–gel process

Enhancement of Optical Oxygen Sensing Properties of [Ru(bpy)3]2+- Based Composites Along With Maghemite and Ionic Liquid

PREPARACIÓN DE SENSORES BASADOS EN ÓXIDO DE Fe DOPADOS CON Pt PARA LA DETECCIÓN DE METANO

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