Crystalline structure and surface morphology of tin oxide films grown by DC reactive sputtering

Khalaf, Mohammad; Al-Tememee, Natheera A.; Ibrahim, Fuad T.; Hameed, Mohammed A.

doi:10.1007/s13320-014-0165-4

Cited by 8 publications

(6 citation statements)

References 17 publications

(17 reference statements)

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“…The response time at gas concentration 165 ppm was around 4 sec and at gas concentration 220 ppm was 2 sec while the recovery time were 50 sec and 120 sec, respectively. Since SnO 2 :WO 3 films are n-type semiconductor, the oxidizing NO 2 thin film bulk molecules adsorbed on the oxide surface could captivate electrons shape the conduction band and form NO 2 (32)(33)(34). Our result is nearly similar to that obtained by Bari and Patil (35).…”

Section: Resultssupporting

confidence: 89%

Comparative NO2 Sensing Characteristics of SnO2:WO3 Thin Film Against Bulk and Investigation of Optical Properties of the Thin Film

Journal¹

2018

Baghdad Sci.J

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A comparative investigation of gas sensing properties of SnO2 doped with WO3 based on thin film and bulk forms was achieved. Thin films were deposited by thermal evaporation technique on glass substrates. Bulk sensors in the shape of pellets were prepared by pressing SnO2:WO3 powder. The polycrystalline nature of the obtained films with tetragonal structure was confirmed by X-ray diffraction. The calculated crystalline size was 52.43 nm. Thickness of the prepared films was found 134 nm. The optical characteristics of the thin films were studied by using UV-VIS Spectrophotometer in the wavelength range 200 nm to 1100 nm, the energy band gap, extinction coefficient and refractive index of the thin film were 2.5 eV , 0.024 and 2.51, respectively. Hall measurements confirmed that the films are n-type. The NO2 sensing characteristics of the SnO2:WO3 sensors were studied with various temperatures and NO2 gas concentrations. Both thin film and bulk sensors showed maximum sensitivity at temperature of 250 oC. Thin film sensors showed enhanced response in comparison to that of pellets.

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Section: Resultssupporting

confidence: 89%

Comparative NO2 Sensing Characteristics of SnO2:WO3 Thin Film Against Bulk and Investigation of Optical Properties of the Thin Film

Journal¹

2018

Baghdad Sci.J

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“…Two different thin film stacks were studied: stacks of indium oxide (In 2 O 3 ) and stacks of tin oxide (SnO 2 ). Changes in the RI for materials such as ITO [19] and tin oxide while changing the sputtering pressure have been previously studied [18], [30], and variations of around 5% have been obtained. Therefore, changes in the RIs of indium oxide and tin oxide should be obtained just by changing the sputtering pressure.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of Bragg Gratings on the End Facet of Standard Optical Fibers by Sputtering the Same Material

Ascorbe

Corres

Villar

et al. 2017

J. Lightwave Technol.

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A sputtering process has been applied to deposit quarter-wavelength stacks on the end facet of cleaved optical fibers by using only one material. Standard multimode optical fibers were used as substrates to fabricate broadband filters, and the experimentally measured spectral responses of these devices are shown. Periodical changes in the refractive index of the coating have been achieved by changing the sputtering pressure. A reflected peak with a full width at half maximum of 20 nm centered at 440 nm has been obtained, which provides a good structure for the development of optical fiber sensors working with the wavelength detection technique. This optical structure can be used for several purposes: as tunable wavelength filters or optical fiber sensors or to improve the performance of fluorescence sensors. A theoretical analysis of these structures corroborates the experimental results and allows some rules to be obtained.

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“…They can be coated onto an optical fiber by different methods, such as dip-coating [ 17 , 18 , 19 ] or sputtering [ 16 , 20 ]. Sputtering permits the fine-tuning of the sputtering conditions, which would allow obtaining denser nanocoatings, with lower porosity and greater refractive indices (RI) [ 21 ] when sputtering under high vacuum. Other parameters of the thin film could also be affected by the sputtering parameters as, for example, the crystallographic orientation, the degree of crystallinity, the carrier concentration, or even the stoichiometry [ 21 , 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

Humidity Sensor Based on Bragg Gratings Developed on the End Facet of an Optical Fiber by Sputtering of One Single Material

Ascorbe

Corres

Matı́as

2017

Sensors

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The refractive index of sputtered indium oxide nanocoatings has been altered just by changing the sputtering parameters, such as pressure. These induced changes have been exploited for the generation of a grating on the end facet of an optical fiber towards the development of wavelength-modulated optical fiber humidity sensors. A theoretical analysis has also been performed in order to study the different parameters involved in the fabrication of this optical structure and how they would affect the sensitivity of these devices. Experimental and theoretical results are in good agreement. A sensitivity of 150 pm/%RH was obtained for relative humidity changes from 20% to 60%. This kind of humidity sensors shows a maximum hysteresis of 1.3% relative humidity.

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Crystalline structure and surface morphology of tin oxide films grown by DC reactive sputtering

Cited by 8 publications

References 17 publications

Comparative NO2 Sensing Characteristics of SnO2:WO3 Thin Film Against Bulk and Investigation of Optical Properties of the Thin Film

Comparative NO2 Sensing Characteristics of SnO2:WO3 Thin Film Against Bulk and Investigation of Optical Properties of the Thin Film

Fabrication of Bragg Gratings on the End Facet of Standard Optical Fibers by Sputtering the Same Material

Humidity Sensor Based on Bragg Gratings Developed on the End Facet of an Optical Fiber by Sputtering of One Single Material

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