scholarly journals HYDROGEN GAS SENSOR BASED ON POLYPYRROL MODIFIED BY DAWSON TYPE HETEROPOLIANION

2020 ◽  
pp. 7-17
Author(s):  
Мариана Александровна Феофанова ◽  
Александр Сергеевич Радин ◽  
Анатолий Анатольевич Крылов ◽  
Юлия Анатольевна Малышева
Keyword(s):  
Gas Sensor ◽  
Heteropoly Acid ◽  
Conductive Polymer ◽  
Hydrogen Gas ◽  
Anionic Complex ◽  
Element Analysis ◽  
Ether Extraction ◽  
Wide Range ◽  
Vanadic Acid ◽  
Polypyrrole Film

В статье рассмотрена возможность модифицирования полипиррола анионным комплексом вольфрамовой гетерополикислоты типа Доусона, имеющей химическую формулу H[PWO], и дальнейшего использования модифицированного полипиррола для создания на его основе сенсора на газообразный водород. Фосфорновольфрамовая кислота типа Доусона была синтезирована по методу Дрекселя и выделена эфиратной экстракцией. Анализ свойств гетерополикислоты и модифицированного гетерополикислотой полипиррола был осуществлен методами амперометрии и РФС, а также фотохимически. Модифицирование полипиррола гетерополианионом 2-18 ряда было проведено электрохимическим методом. Была оценена возможность использования такого газового сенсора для анализа газообразного водорода в большом интервале концентраций (от десятых единиц ppm, до объемных процентов). Было также частично определено влияние таких климатических факторов, как влажность и температура, и была оценена перекрестная чувствительность на ряд не измеряемых компонентов. This article discusses material on electrochemistry and the application of polypyrrole, which belongs to the class of «conductive polymers». The possibility of its modification by the anionic complex of a phospho tungsto-vanadic acid of the Dawson type, with the chemical formula H[PWO], and further use of the modified polypyrrole to create a hydrogen gas sensor based on it, is considered. Phospho tungsto-vanadic heteropoly acid of the Dawson type was synthesized with the known method [1, p. 180-181], and isolated by ether extraction. The analysis of properties, heteropoly acid content, and polypyrrole modified with a heteropoly acid was carried out by amperometry and XPS methods, as well as photochemically. Modification of polypyrrole heteropolyanion of 2-18 type was carried out by the electrochemical method. The presence of the heteropoly anion in the structure of the heteropoly acid-modified polypyrrole film during the repeated washing with water indicates the formation of a chemical bond between the anion of the heteropoly acid and the chain of the conductive polymer, which was also indirectly confirmed by amperometry and element analysis, as well as a positive test result of testing the sensitivity of the gas cell to hydrogen made on the basis of obtained modified polypyrrole. The possibility of using such the gas sensor to measure hydrogen in a wide range of concentrations (from tenths of ppm to volume percent) was evaluated. The influence of ambient factors such as humidity and temperature was also partially determined, and cross sensitivity to a number of unmeasured components was evaluated.

Flexible Fiber-Shaped Hydrogen Gas Sensor via Coupling Palladium with Conductive Polymer Gel Fiber

2021 ◽  
pp. 125008
Author(s):  
Zhengyou Zhu ◽  
Congcong Liu ◽  
Fengxing Jiang ◽  
Jing Liu ◽  
Guoqiang Liu ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Conductive Polymer ◽  
Hydrogen Gas ◽  
Polymer Gel ◽  
Flexible Fiber

Wide-range (0.33%–100%) 3C–SiC resistive hydrogen gas sensor development

2004 ◽  
Vol 85 (3) ◽  
pp. 416-418 ◽  
Author(s):  
Timothy J. Fawcett ◽  
John T. Wolan ◽  
Rachael L. Myers ◽  
Jeremy Walker ◽  
Stephen E. Saddow
Keyword(s):  
Gas Sensor ◽  
Hydrogen Gas ◽  
Sensor Development ◽  
Wide Range

A portable low-power hydrogen gas sensor system for wide range H/sub 2/ detection

2002 ◽  
Author(s):  
D.L. Hetherington ◽  
R.W. Grant ◽  
K.L. Hughes ◽  
W.T. Corbett ◽  
R.C. Hughes ◽  
...  
Keyword(s):  
Low Power ◽  
Gas Sensor ◽  
Hydrogen Gas ◽  
Sensor System ◽  
Wide Range

Heterostructure Fe2O3–In2O3 Nanoparticles as Hydrogen Gas Sensor

2021 ◽  
Author(s):  
D. M. Chethana ◽  
T. C. Thanuja ◽  
H. M. Mahesh ◽  
M. S. Kiruba ◽  
H. C. Barshilia ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Hydrogen Gas ◽  
In2o3 Nanoparticles

scholarly journals Sensing mechanism of an optimized room temperature optical hydrogen gas sensor made of zinc oxide thin films

2020 ◽  
Vol 9 (5) ◽  
pp. 10624-10634
Author(s):  
Siti Nor Aliffah Mustaffa ◽  
Nurul Assikin Ariffin ◽  
Ahmed Lateef Khalaf ◽  
Mohd. Hanif Yaacob ◽  
Nizam Tamchek ◽  
...  
Keyword(s):  
Thin Films ◽  
Zinc Oxide ◽  
Gas Sensor ◽  
Room Temperature ◽  
Hydrogen Gas ◽  
Oxide Thin Films ◽  
Sensing Mechanism

scholarly journals Design of 3D Additively Manufactured Hybrid Structures for Cranioplasty

Materials ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 181
Author(s):  
Roberto De Santis ◽  
Teresa Russo ◽  
Julietta V. Rau ◽  
Ida Papallo ◽  
Massimo Martorelli ◽  
...  
Keyword(s):  
Physical Models ◽  
Cranial Bone ◽  
Head Model ◽  
Rigid Sphere ◽  
Element Analysis ◽  
Aliphatic Polyesters ◽  
Hybrid Device ◽  
Wide Range ◽  
Hybrid Devices ◽  
Technical Solutions

A wide range of materials has been considered to repair cranial defects. In the field of cranioplasty, poly(methyl methacrylate) (PMMA)-based bone cements and modifications through the inclusion of copper doped tricalcium phosphate (Cu-TCP) particles have been already investigated. On the other hand, aliphatic polyesters such as poly(ε-caprolactone) (PCL) and polylactic acid (PLA) have been frequently investigated to make scaffolds for cranial bone regeneration. Accordingly, the aim of the current research was to design and fabricate customized hybrid devices for the repair of large cranial defects integrating the reverse engineering approach with additive manufacturing, The hybrid device consisted of a 3D additive manufactured polyester porous structures infiltrated with PMMA/Cu-TCP (97.5/2.5 w/w) bone cement. Temperature profiles were first evaluated for 3D hybrid devices (PCL/PMMA, PLA/PMMA, PCL/PMMA/Cu-TCP and PLA/PMMA/Cu-TCP). Peak temperatures recorded for hybrid PCL/PMMA and PCL/PMMA/Cu-TCP were significantly lower than those found for the PLA-based ones. Virtual and physical models of customized devices for large cranial defect were developed to assess the feasibility of the proposed technical solutions. A theoretical analysis was preliminarily performed on the entire head model trying to simulate severe impact conditions for people with the customized hybrid device (PCL/PMMA/Cu-TCP) (i.e., a rigid sphere impacting the implant region of the head). Results from finite element analysis (FEA) provided information on the different components of the model.

Improvement of the Detection Sensitivity of Edxrf Trace Element Analysis by Means of Efficient X-Ray Focusing Based on Strongly Curved Hopg Crystals

1995 ◽  
Vol 39 ◽  
pp. 109-117
Author(s):  
Burkhard Beckhoff ◽  
Birgit Kanngießer
Keyword(s):  
High Intensity ◽  
Focal Plane ◽  
Bragg Reflection ◽  
Pyrolytic Graphite ◽  
Trace Element Analysis ◽  
Detection Sensitivity ◽  
Element Analysis ◽  
X Ray ◽  
Wide Range ◽  
Very High

X-ray focusing based on Bragg reflection at curved crystals allows collection of a large solid angle of incident radiation, monochromatization of this radiation, and condensation of the beam reflected at the crystal into a small spatial cross-section in a pre-selected focal plane. Thus, for the Bragg reflected radiation, one can achieve higher intensities than for the radiation passing directly to the same small area in the focal plane. In that case one can profit considerably from X-ray focusing in an EDXRF arrangement. The 00 2 reflection at Highly Oriented Pyrolytic Graphite (HOPG) crystals offers a very high intensity of the Bragg reflected beam for a wide range of photon energies. Furthermore, curvature radii smaller than 10 mm can be achieved for HOPG crystals ensuring efficient X-ray focusing in EDXRF applications. For the trace analysis of very small amounts of specimen material deposited on small areas of thin-filter backings, HOPG based X-ray focusing may be used to achieve a very high intensity of monochromatic excitation radiation.

Enhanced gas sensing performance of tin dioxide-based nanoparticles for a wide range of concentrations of hydrogen gas

RSC Advances ◽  
2014 ◽  
Vol 4 (36) ◽  
pp. 18512 ◽  
Author(s):  
Pratanu Nag ◽  
Sanhita Majumdar ◽  
Ali Bumajdad ◽  
Parukuttyamma Sujatha Devi
Keyword(s):  
Tin Dioxide ◽  
Gas Sensing ◽  
Hydrogen Gas ◽  
Wide Range ◽  
Sensing Performance

scholarly journals A Highly Sensitive Room Temperature CO2 Gas Sensor Based on SnO2-rGO Hybrid Composite

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 522
Author(s):  
Zhi Yan Lee ◽  
Huzein Fahmi bin Hawari ◽  
Gunawan Witjaksono bin Djaswadi ◽  
Kamarulzaman Kamarudin
Keyword(s):  
Electron Microscopy ◽  
Carbon Dioxide ◽  
Gas Sensor ◽  
Photoelectron Spectroscopy ◽  
Hybrid Composite ◽  
Room Temperature ◽  
Co2 Gas ◽  
X Ray ◽  
Wide Range ◽  
Co2 Gas Sensor

A tin oxide (SnO2) and reduced graphene oxide (rGO) hybrid composite gas sensor for high-performance carbon dioxide (CO2) gas detection at room temperature was studied. Since it can be used independently from a heater, it emerges as a promising candidate for reducing the complexity of device circuitry, packaging size, and fabrication cost; furthermore, it favors integration into portable devices with a low energy density battery. In this study, SnO2-rGO was prepared via an in-situ chemical reduction route. Dedicated material characterization techniques including field emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HRTEM), energy dispersive X-ray (EDX) spectroscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS) were conducted. The gas sensor based on the synthesized hybrid composite was successfully tested over a wide range of carbon dioxide concentrations where it exhibited excellent response magnitudes, good linearity, and low detection limit. The synergistic effect can explain the obtained hybrid gas sensor’s prominent sensing properties between SnO2 and rGO that provide excellent charge transport capability and an abundance of sensing sites.

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