Gas response control through structural and chemical modification of metal oxide films: state of the art and approaches

Korotcenkov, Ghenadii

doi:10.1016/j.snb.2004.10.006

Cited by 653 publications

(388 citation statements)

References 67 publications

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“…ZnO is an n-type direct band semiconductor having a wide-band gap (3.4 eV), low resistivity and high transparency in the visible range and high light trapping characteristic 2 . However, the sensitivity of the ZnO material is not sufficiently high 3,4 . Because of the high activation energy of reaction with gas molecules, high temperature (300°C-400°C) is applied for the ZnO gas sensor to get higher response [5][6][7] .…”

Section: Introductionmentioning

confidence: 99%

High sensitivity ethanol gas sensor based on Sn - doped ZnO under visible light irradiation at low temperature

et al. 2014

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Pure ZnO and 5at%, 7at%, 9at% Sn-doped ZnO materials are prepared by the chemical coprecipitation method. They were annealed by furnace at temperature range of 300-700°C in air for 1h. The ZnO materials are characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that the Sn-doped ZnO materials appear rough porous structures. The maximum sensitivity can be achieved by doping the amount of 7 at%. It has much better sensing performance towards ethanol vapor under visible light irradiation. The response and recovery time are ~1s and ~5s, respectively. The mechanism for the improvement in the sensing properties can be explained with the surface adsorption theory and the photoactivation theory.

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Section: Introductionmentioning

confidence: 99%

High sensitivity ethanol gas sensor based on Sn - doped ZnO under visible light irradiation at low temperature

et al. 2014

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“…The nanostructured thin films were made using the sol-gel technique, mixing together two different solutions: first the SiO 2 matrix solution is prepared by mixing CH 3 [3(trimethoxysilyl)propyl]-ethylenediammine (DAEPTMS), keeping the molar ratio Ni/DAEPTMS = 1. This modified silane was chosen as an appropriate coordinating agent because of its double aminic functionality, which gives the capability to anchor the metal ions to the SiO 2 network, leading to an homogeneous Ni dispersion inside the matrix.…”

Section: Methodsmentioning

confidence: 99%

“…At the same time, much effort has been directed toward identifying different materials as suitable active layers for toxic gases and organic vapours (VOCs), using metal oxides [2][3][4], polymers [5], and organic dyes [6].…”

Section: Introductionmentioning

confidence: 99%

Comparison study of conductometric, optical and SAW gas sensors based on porous sol–gel silica films doped with NiO and Au nanocrystals

Gaspera

Buso

Guglielmi

et al. 2010

Sensors and Actuators B: Chemical

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Conductometric, optical and surface acoustic wave gas sensors based on sol-gel silica porous films doped with NiO and Au nanoparticles are studied. The nanocomposite films are characterized by optical absorption in the visible and near-infrared region, spectroscopic ellipsometry, X-ray diffraction (XRD), transmission electron microscopy (TEM), energy-dispersive X-ray (EDX) analysis and X-ray photoemission spectroscopy (XPS). They show poor conductometric gas sensing response toward CO and H 2 . However, both optical and surface acoustic wave (SAW) responses are reversible and stable to H 2 . Moreover, exploiting the wavelength dependence of the optical sensor response it is possible to selective recognition of H 2 . Choosing the appropriate wavelength, almost no variation in absorption is observed when introducing different gases into the testing chamber.

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“…ZnO, SnO 2 , TiO 2 and Ga 2 O 3 have been extensively studied for gas sensing applications [13][14][15]. Addition of dopants to modify sensitivity, selectivity and stability has also been exhaustively studied.…”

Section: Specific Gas Sensorsmentioning

confidence: 99%

(Sensor Division Outstanding Achievement Award Presentation) Ceramic Gas Sensors to Oxide Nanostructures: Opportunities and Challenges

Akbar¹

2013

ECS Trans.

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This article summarizes R&D efforts in the author's laboratory starting with the development of ceramic-based gas sensors to the fabrication of ordered/oriented oxide nanostructures exploiting intrinsic material properties. Over the past twenty years, our focus has been on the development of a series of high-temperature gas sensors specifically for combustion processes. We have developed both the resistive and electrochemical sensors and the underlying theme of our work has been the use of materials science and chemistry to promote high-temperature performance with selectivity. Our recent work has led to the development of surface modification techniques for the fabrication of oxide nanostructures that are inexpensive, highly scalable and do not require use of lithography. These nano-structures can be used as platforms for chemical sensing, photocatalysis, electroemission and biomedical applications. This article is concluded with preliminary results on chemical sensing along with future directions.

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Gas response control through structural and chemical modification of metal oxide films: state of the art and approaches

Cited by 653 publications

References 67 publications

High sensitivity ethanol gas sensor based on Sn - doped ZnO under visible light irradiation at low temperature

High sensitivity ethanol gas sensor based on Sn - doped ZnO under visible light irradiation at low temperature

Comparison study of conductometric, optical and SAW gas sensors based on porous sol–gel silica films doped with NiO and Au nanocrystals

(Sensor Division Outstanding Achievement Award Presentation) Ceramic Gas Sensors to Oxide Nanostructures: Opportunities and Challenges

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