Defects and morphology of tungsten trioxide thin films

LeGore, L.J.; Lad, Robert J.; Moulzolf, Scott C.; Vetelino, J.F.; Frederick, B.G.; Kenik, E.A.

doi:10.1016/s0040-6090(02)00047-0

Cited by 60 publications

(58 citation statements)

References 31 publications

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“…Of the methods used to prepare these oxides, those that are most commonly cited in the literature require the use of thin films (< 1 micrometer). However, in some cases thick films are used, doped with noble metals or various nanoshapes designed to effect grain boundaries [18][19][20][21][22][23][24][25]. These metal oxide sensors must be heated to elevated temperatures that range from 100 to 600°C [18,[26][27][28] which, in many cases for the effective monitoring of a given analyte, must be precisely controlled.…”

Section: The Interfacementioning

confidence: 99%

Nanostructure directed interfaces created from nanoparticle island sites deposited to microporous arrays and forming sensor platforms

Gole¹,

Laminack²,

Boudreaux³

2017

Front Nanosci Nanotech

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Novel nanostructured island sites are made to decorate a microporous/nanoporous array. These island sites are formed from a variety of easily produced nanostructured metal oxides deposited from solution. Sensor platforms are distinct from and do not require film-based coating. The nanostructure directing acidic metal oxide sites which vary in their Lewis acidity decorate micropores and control the electron transduction process. The interaction of analytes with these island sites varies in a predictable manner and can be modified through in-situ functionalization of their Lewis acidity. The microporous structure allows rapid Fickian diffusion of analytes to the active nanostructure island sites whose reversible interaction dominates the sensor response as it requires low energy consumption. Highly accurate repeat depositions are not required. We require that the island sites are deposited at sufficiently low concentration so as not to interact electronically with each other. The response time of these interfaces is more rapid than film-based depositions, which require a more lengthy diffusion time. The sensors are reversible. The nanoporous structure prevents sintering of these island centers at elevated temperatures. The concentration of detection centers can be made to produce an optimum matrix of enhanced sensor responses, force a dominant distinct analyte-interface physisorption (rather than chemisorption). The produced semiconductor interface is easily functionalized to create an enhanced range of nanoparticle semiconductor sites. The matrix provides a sensitive means of transferring electrons that are easily detected. The sensors operate at room temperature as well as elevated temperatures. Low energy magnetic field signal enhancement can be achieved with transition metals. Contaminated sensors can be readily rejuvenated. Pulsed mode operation ensures low analyte consumption and high analyte selectivity and further provides the ability to rapidly assess false positive signals using Fast Fourier Transfer techniques, Solar pumped sensors requiring low light levels (≤ 1 Watt) have been demonstrated. Water vapor contamination can be greatly if not entirely reduced. The modelling of sensor response with a new Fermi energy distribution -based response isotherm is found to be superior to other isotherms. Sensors operate can be made to operate efficiently for two gases simultaneously. Modes of extending these studies to multiple gas arrays are considered.

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Section: The Interfacementioning

confidence: 99%

Nanostructure directed interfaces created from nanoparticle island sites deposited to microporous arrays and forming sensor platforms

Gole¹,

Laminack²,

Boudreaux³

2017

Front Nanosci Nanotech

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“…A the area of the sample in cm 2 and ρ the materials density in gm cm −3 . The values of the film thickness with crystalline size are given in Table 3.…”

Section: Is the Weight Of The Sample In Gmmentioning

confidence: 99%

“…Then the reaction with the target gas molecule causes reduction of depletion region which results change in conductivity of metal oxide semiconductor. The conductivity may increase or decrease depending on type of semiconductor and type of target gas [1][2].…”

Section: Introductionmentioning

confidence: 99%

Studies on Structural, Morphology and Electrical Properties of Chemically Sprayed WO3-V2O5 Nanocomposites thin Films

Patil¹,

Patil²,

Bari³

et al. 2015

ILCPA

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ABSTRACT. Spray pyrolysis technique was employed to prepare WO 3 -V 2 O 5 nanocomposites thin onto the preheated glass substrate at 350 o C. The films were characterized using X-ray diffractogram (XRD), Field emission scanning electron microscopy (FE-SEM), and Element composition was studied using energy dispersive spectrophotometer (EDAX).The film thickness was measured using weight difference method. Electrical conductivity measured with the help of two probe method. The crystallite size and grain size were observed to be increase with increase in films thickness with decrease in activation energy. The results are discussed and interpreted.

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“…The most commonly cited types of oxide sensors in the literature are based off thin films (<1 micrometer). However, in some cases thick films are used, doped with noble metals or various nanoshapes designed to effect grain boundaries [13][14][15][16][17][18][19][20]. These metal oxide sensors must be heated to elevated temperatures that range from 100 to 600°C depending on the analyte [13,[21][22][23].…”

Section: Introductionmentioning

confidence: 99%