Sol–gel synthesized Titania nanoparticles deposited on porous polycrystalline silicon: Improved carbon dioxide sensor properties

Bahar, Mahmood; Gholami, Mahtab; Azim-Araghi, M.E.

doi:10.1016/j.mssp.2014.05.035

Cited by 21 publications

(6 citation statements)

References 38 publications

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“…The E g values were calculated to be 3.2, 3.25, 3.28, 3.35 eV for pH 6.8, 5.0, 4.4 and 3.2 samples, respectively. The increase in band gap can be correlated to the reduction of the crystallite size that determined quantum size effect, which induce a blue shift of the absorption edge in the optical reflectance [ 38 , 39 ]. Lowering of pH gave an obvious decrease of the crystallite size that can be correlated with the increase of the band gap [40] .…”

Section: Resultsmentioning

confidence: 99%

Influence of acidic pH on the formulation of TiO 2 nanocrystalline powders with enhanced photoluminescence property

Tsega

Dejene

2017

Heliyon

103

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Titanium dioxide (TiO2) nanoparticles were prepared by the sol-gel method at different pH values (3.2–6.8) with a hydrochloric acid (HCl) solution. Raw samples were calcined at 500 °C for 2 h. The effects of pH on the structural, morphological and optical properties of TiO2 nanoparticles were investigated. At pH 4.4–6.8, only the anatase phase of TiO2 was observed. Under strong acidic condition at pH 3.2 rutile, brookite and anatase co-exist, but rutile is the predominant phase. The strain value increased and the crystallite size decreased as the HCl content increased. The increased crystallite sizes in the range 21–24 nm and enhanced blue emission intensity around 432 nm was obtained for the sample at pH 5.0. Experimental results showed that TiO2 nanoparticles synthesized at pH 5.0 exhibited the best luminescence property with pure anatase phase.

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Section: Resultsmentioning

confidence: 99%

Influence of acidic pH on the formulation of TiO 2 nanocrystalline powders with enhanced photoluminescence property

Tsega

Dejene

2017

Heliyon

103

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“…1b is using different alcohols. In this formula, K (Scherrer's constant) is 0.89 for TiO 2 [17], b is full width at half maximum intensity and h is the angle. It is clear that the size of particles with respect to the using alcohol can be sorted as: …”

Section: Resultsmentioning

confidence: 99%

Effect of different alcohols, gelatinizing times, calcination and microwave on characteristics of TiO2 nanoparticles synthesized by sol–gel method

2017

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In this work, nanoparticles of titanium dioxide (TiO 2 ) were synthesized by means of TiCl 4 as precursor. Effects of alcohol type, calcination, gelatinizing time and microwave exposure on the particle size, morphology, crystallinity and particle phase are studied using XRD patterns and SEM images. Results showed that alcohols such as ethanol increased the particle size; calcination increased the particle size and improved the crystallinity of particles. Microwave exposure of particles resulted in smaller particles; adding water increased the impact of microwave. Effect of microwave exposure in rutile phase formation is also observed during this study.

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“…Metals, semiconductors and polymers are reported to be partially deposited or to totally fill PSi pores by using the spin coating electrochemical deposition or liquid contact methods [2,5]. Also, because of its very large surface/volume ratio (hundreds of m 2 /cm 3 ), a high reactivity, and its potential compatibility with silicon-based electronics, the (PSi) is one of the most promising materials for the fabrication of gas sensors [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Electrical Properties of Porous Silicon for N2 Gas Sensor

Bahar¹,

Eskandari²,

Shaban³

2017

J Theor Comput Sci

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The application of porous silicon (PSi) for gas sensing devices has gained a considerable attention in the last decade. This work considers the electrical features of PSi layers prepared by electrochemical etching. We find that in order to get a better understanding of the absorption properties of PSi surface, it is necessary to know how the PSi morphology depends on the etching parameters. The physical structure of PSi, i.e., porosity, and pore size distribution can be controlled by changing the Hydrofluoric Acid concentration, current density, anodizing length and etching time in anodizing procedure. We describe our test system for gas sensors and investigate on the electrical behavior of PSi layers (p-type) in N 2 gas for various fabrication conditions. The results show that the current density increases significantly as N 2 gas is adsorbed. The measurements of the I-V characteristics were carried out at atmospheric pressure, room temperature, and with N 2 gas as well.

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Sol–gel synthesized Titania nanoparticles deposited on porous polycrystalline silicon: Improved carbon dioxide sensor properties

Cited by 21 publications

References 38 publications

Influence of acidic pH on the formulation of TiO 2 nanocrystalline powders with enhanced photoluminescence property

Influence of acidic pH on the formulation of TiO 2 nanocrystalline powders with enhanced photoluminescence property

Effect of different alcohols, gelatinizing times, calcination and microwave on characteristics of TiO2 nanoparticles synthesized by sol–gel method

Electrical Properties of Porous Silicon for N2 Gas Sensor

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