Potassium polytitanate gas-sensor study by impedance spectroscopy

Fedorov, Fedor S.; Varezhnikov, Alexey S.; Kiselev, I.; Колесниченко, В. В.; Бурмистров, И. Н.; Sommer, Martin; Fuchs, D.; Kübel, Christian; Gorokhovsky, Alexander; Sysoev, Victor V.

doi:10.1016/j.aca.2015.09.029

Cited by 30 publications

(21 citation statements)

References 28 publications

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“…The structure and properties of polytitanates depend significantly on the composition of the initial components, the K 2 O/TiO 2 ratio in the molecule, and the conditions of synthesis. Depending on the conditions of synthesis, PPTs can form amorphous or crystalline structures with particles of different morphologies, from a layered scalylike form, nanofibers and microfibers with different cross‐sectional shapes, to hollandite‐like tunnel structures …”

Section: Introductionmentioning

confidence: 99%

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Epoxy composites modified with microfibers of potassium polytitanates

Mostovoy

Kadykova

Bekeshev

et al. 2018

J of Applied Polymer Sci

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The research we conducted shows the possibility of the directed adjustment of epoxy composite performance characteristics through the application of small additives of potassium polytitanate whiskers, the introduction of polyfunctional plasticizers with chemical and mechanical methods of activation of the whole composition and its components; this ensured the creation of a new generation of epoxy composites with high‐performance properties (breaking tension = 116 MPa and modulus of elasticity at bending = 3150 MPa, destructive tension under compression = 95 MPa, impact strength = 18 kJ/m2 that meets the requirements of most industries. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46651.

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Section: Introductionmentioning

confidence: 99%

“…Because of their properties, PPTs can be used as relatively inexpensive fillers of polymer–matrix and metal–matrix composites with high mechanical strengths, reduced coefficients of friction, and high thermal stabilities …”

Section: Introductionmentioning

confidence: 99%

Epoxy composites modified with microfibers of potassium polytitanates

Mostovoy

Kadykova

Bekeshev

et al. 2018

J of Applied Polymer Sci

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“…But XRD data (Fig. 2 ) revealed that this sample (as well as 1D nanorods samples, fabricated at 1.0 M KOH) contains considerable precipitates of K-polytitanates, which are low-conducting (insulating/semiconducting) in nature 39 , 43 , and hence hinders the charge transfer process to reduce the electrochemical performance against the 2D platelet + 1D nanorod mixed sample. This argument is validated by the conductivity measurements of the samples via a two-probe method under ambient conditions (conducting silver paste is used for ohmic contact, linearity of which is verified over a wide voltage range).…”

Section: Resultsmentioning

confidence: 99%

“…This is manifested by the dissolution of Ti into the aqueous KOH solution to form some polytitanate anions, and, depending on the hydrothermal conditions as well as the KOH concentration, these polytitanate anions are then precipitated in the form of K-polytitanates onto the titania surface. This K-polytitanate formation can be represented as 38 , 39 : Upon heating, the hydrated K-polytitanate ( K 2m O m • nTiO 2 • mH 2 O ) is converted to potassium-polytitanate ( K 2 m Ti n O 2n+m ). Apparently, both the titania and K-polytitanate formations occur simultaneously, and in the current case, with the increase in the KOH concentrations, K-polytitanate formation is found to increase, which is corroborated by the XRD measurements and explained in details later.…”

Section: Hydrothermal Chemistrymentioning

confidence: 99%

Improved electrochemical properties of morphology-controlled titania/titanate nanostructures prepared by in-situ hydrothermal surface modification of self-source Ti substrate for high-performance supercapacitors

Banerjee

Anitha

Joo

2017

Sci Rep

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AbstarctTi substrate surface is modified into two-dimensional (2D) TiO2 nanoplatelet or one-dimensional (1D) nanorod/nanofiber (or a mixture of both) structure in a controlled manner via a simple KOH-based hydrothermal technique. Depending on the KOH concentration, different types of TiO2 nanostructures (2D platelets, 1D nanorods/nanofibers and a 2D+1D mixed sample) are fabricated directly onto the Ti substrate surface. The novelty of this technique is the in-situ modification of the self-source Ti surface into titania nanostructures, and its direct use as the electrochemical microelectrode without any modifications. This leads to considerable improvement in the interfacial properties between metallic Ti and semiconducting TiO2. Since interfacial states/defects have profound effect on charge transport properties of electronic/electrochemical devices, therefore this near-defect-free interfacial property of Ti-TiO2 microelectrode has shown high supercapacitive performances for superior charge-storage devices. Additionally, by hydrothermally tuning the morphology of titania nanostructures, the electrochemical properties of the electrodes are also tuned. A Ti-TiO2 electrode comprising of a mixture of 2D-platelet+1D-nanorod structure reveals very high specific capacitance values (~7.4 mF.cm−2) due to the unique mixed morphology which manifests higher active sites (hence, higher utilization of the active materials) in terms of greater roughness at the 2D-platelet structures and higher surface-to-volume-ratio in the 1D-nanorod structures.

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“…One common sensing principle is the electrochemical variations that occur between target gases and different sensor materials, such as metal oxide semiconductors, polymers, and carbon nanotubes [4] [5]. In recent decades, optical spectroscopy based methods have become increasingly popular for gas sensing [6] [7][8] [9][10], due to their high sensitivity, selectivity and stability. These methods measure the chemical composition dependent absorption of light that occurs at different wavelengths when light passes through the flue gas [11].…”

Section: Introductionmentioning

confidence: 99%

A generalized fuzzy linguistic model for predicting component concentrations in an optical gas sensing system

Wang

Cao

Yan

et al. 2016

Chemometrics and Intelligent Laboratory Systems

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Motivated by environmental protection concerns, monitoring the flue gas of thermal power plant is now often mandatory due to the need to ensure that emission levels stay within safe limits. Optical based gas sensing systems are increasingly employed for this purpose, with regression techniques used to relate gas optical absorption spectra to the concentrations of specific gas components of interest (N O x , SO 2 etc.). Accurately predicting gas concentrations from absorption spectra remains a challenging problem due to the presence of nonlinearities in the relationships and the high-dimensional and correlated nature of the spectral data. This article proposes a generalized fuzzy linguistic model (GFLM) to address this challenge. The GFLM is made up of a series of "If-Then" fuzzy rules. The absorption spectra are input variables in the rule antecedent. The rule consequent is a general nonlinear polynomial function of the absorption spectra. Model parameters are estimated using least squares and gradient descent optimization algorithms. The performance of GFLM is compared with other traditional prediction models, such as partial least squares, support vector machines, multilayer perceptron neural networks and radial basis function neural networks, for two real flue gas spectral datasets: one from a coal-fired power plant and one from a gas-fired power plant. The experimental results show that the generalized fuzzy linguistic model has good predictive ability, and is competitive with alternative approaches, while having the added advantage of providing an interpretable model.

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Potassium polytitanate gas-sensor study by impedance spectroscopy

Cited by 30 publications

References 28 publications

Epoxy composites modified with microfibers of potassium polytitanates

Epoxy composites modified with microfibers of potassium polytitanates

Improved electrochemical properties of morphology-controlled titania/titanate nanostructures prepared by in-situ hydrothermal surface modification of self-source Ti substrate for high-performance supercapacitors

A generalized fuzzy linguistic model for predicting component concentrations in an optical gas sensing system

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