scholarly journals DESINGN OF GAS SENSOR BASED ON TIN OXIDE NANOWHISKERS

2020 ◽  
pp. 731-737
Author(s):  
Дмитрий Александрович Тимошенко ◽  
Илья Владимирович Синёв ◽  
Вячеслав Владимирович Симаков
Keyword(s):  
Gas Sensor ◽  
Tin Oxide ◽  
Vapor Deposition ◽  
Tin Dioxide ◽  
Average Diameter ◽  
Acetone Vapor ◽  
Partial Pressure Of Oxygen ◽  
Technological Parameters ◽  
Gas Sensitivity ◽  
Deposition Zone

Методом осаждения из паровой фазы были выращены нитевидные нанокристаллы диоксида олова. Исследовано влияние технологических параметров синтеза на морфологию выращенных наноструктур. Показано, что увеличение парциального давления кислорода в диапазоне от 0,06 мбар до 9,3 мбар и температуры зоны осаждения в диапазоне от 940 °С до 995 °С приводит к увеличению диаметра формируемых нитевидных нанокристаллов. В экспериментах установлено, что средний диаметр нитевидных нанокристаллов варьировался от 80 нм до 250 нм. На основе полученных нанокристаллов был сформирован активный слой газового сенсора, чувствительный к парам ацетона в воздухе. Величина газочувствительности и характерные времена отклика полученного сенсора достаточны для практического применения в газоанализаторах и системах распознавания газовых смесей и запахов. Tin dioxide nanowhiskers were grown by the vapor deposition. The effect of technological parameters on the morphology of the grown nanostructures was investigated. It is shown that an increase in the partial pressure of oxygen in the range from 0,06 mbar to 9,3 mbar and the temperature of the deposition zone in the range from 940 °C to 995 °C leads to an increase in the diameter of the formed nanocrystals. Experimentally it was shown that the average diameter of nanowhiskers varied from 80 nm to 250 nm. A gas sensor was formed with an active layer, based on the nanocrystals, sensitive to acetone vapor. The value of the gas sensitivity and the characteristic times of the sensor are sufficient for practical use in gas analyzers and systems for recognizing gas mixtures and odors.

scholarly journals RECOGNITION OF GAS-AIR MIXTURES BY A SINGLE GAS SENSOR BASED ON TIN DIOXIDE NANOWHISKERS

2021 ◽  
pp. 796-801
Author(s):  
Дмитрий Александрович Тимошенко ◽  
Илья Владимирович Синёв ◽  
Вячеслав Владимирович Симаков ◽  
Никита Александрович Клычков
Keyword(s):  
Gas Sensor ◽  
Concentration Dependence ◽  
Vapor Deposition ◽  
Physical Vapor Deposition ◽  
Tin Dioxide ◽  
Gas Sensitivity ◽  
Reducing Gas ◽  
Time Drift ◽  
Reducing Gases

Нитевидные нанокристаллы диоксида олова были выращены методом физического осаждения из паровой фазы и перенесены на контактную систему методом замороженной капли. Полученные сенсоры обладают газочувствительностью, воздействие паров газов-восстановителей приводит к увеличению их проводимости. Показано, что существует долговременный дрейф проводимости сенсора при воздействии пробы. Исследована концентрационная зависимость чувствительности сенсора к парам этанола, ацетона и пропанол-2 при температуре 300 °С. На основе анализа концентрационных зависимостей проводимости рассчитаны энергии десорбции частиц, а также положения донорных уровней, индуцированных при адсорбции газов-восстановителей, относительно акцепторного уровня кислорода. Показано, что рассчитанные параметры имеют существенно меньший по сравнению с проводимостью временной дрейф. Использование указанных параметров позволяет распознавать газовоздушные смеси, т.е. однозначно отнести одну из трех исследованных проб к её классу. Tin dioxide nanowhiskers were grown by physical vapor deposition and transferred to the contact system by the frozen drop method. The sensors demonstrate gas-sensitivity. Exposing sensors to the atmosphere contained vapors of reducing-gases leads to an increasing of their conductivity. A long-term drift of the sensor conductivity during reducing-gas exposition was shown. A sensitivity response vs concentration for ethanol, acetone, and propanol-2 vapors at temperature 300 °C was investigated. Desorption energies of the particles and the positions of the donor levels induced by adsorption of reducing gases particles were calculated by analysis of the conductivity vs concentration dependence. The calculated parameters had a significantly smaller time drift in comparison with the conductivity. Using of these parameters makes possible to recognize gas-air mixtures: classify the each of three studied samples to one of classes.

The Influence of Catalysts on the Gas Sensitivity of a Gas Sensor Based on SnO2 Films + 1 % at. Si

2020 ◽  
Vol 28 ◽  
pp. 161-169
Author(s):  
Tatyana Aleksandrovna Perepechina ◽  
Stanislav Ivanovich Rembeza ◽  
Tamara Vital'evna Svistova ◽  
Еkaterina Stanislavovna Rembeza ◽  
Vadim Aleksandrovich Buslov
Keyword(s):  
Surface Modification ◽  
Film Thickness ◽  
Gas Sensor ◽  
Tin Dioxide ◽  
Operating Temperature ◽  
Sensitive Layer ◽  
Gas Sensitivity ◽  
Microelectronic Technology

The paper is devoted to the study of the influence of surface modification by catalysts on the gas sensitivity of a gas sensor. The sample for the study is a gas sensor crystal with dimensions of 1 × 1 mm2, manufactured using microelectronic technology. Its design is represented by a film heater, two sensitive elements (SE) based on tin dioxide with the addition of 1 % at. Si (film thickness = 250 nm, the size of the SE area is 200 x 320 μm2) and contacts for the sensitive layer in the form of an interdigital platinum structure with a distance between contacts of 10 μm. It is established that doping increases the gas sensitivity and lowers the operating temperature.

Fabrication of a one-dimensional tube-in-tube polypyrrole/tin oxide structure for highly sensitive DMMP sensor applications

2017 ◽  
Vol 5 (33) ◽  
pp. 17335-17340 ◽  
Author(s):  
Jaemoon Jun ◽  
Jun Seop Lee ◽  
Dong Hoon Shin ◽  
Jungkyun Oh ◽  
Wooyoung Kim ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Tin Oxide ◽  
Vapor Deposition ◽  
High Sensitivity ◽  
Oxide Structure ◽  
One Dimensional ◽  
Sensor Applications ◽  
Highly Sensitive ◽  
Sensitivity And Selectivity

1D tube-in-tube polypyrrole/tin oxide structure was fabricated using electrospinning and vapor deposition polymerization to construct the DMMP gas sensor, which shows high sensitivity and selectivity.

Molecular-Sieving Gas Sensor Prepared by Chemical Vapor Deposition of Silica on Tin Oxide Using an Organic Template

1998 ◽  
Vol 71 (2) ◽  
pp. 513-519 ◽  
Author(s):  
Nobuaki Kodakari ◽  
Takeshi Sakamoto ◽  
Kouji Shinkawa ◽  
Hisato Funabiki ◽  
Naonobu Katada ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Gas Sensor ◽  
Tin Oxide ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Organic Template ◽  
Molecular Sieving

Preparation and Gas Sensitivity of Crown Ether Metal Complex Film Gas Sensor

2020 ◽  
Vol 2 (1) ◽  
pp. 1-12
Author(s):  
Gulgina Mamtimin ◽  
Halisa Arkin ◽  
Patima Nizamidin ◽  
Erkin Tursun ◽  
Abliz Yimit
Keyword(s):  
Crown Ether ◽  
Metal Complex ◽  
Gas Sensor ◽  
Gas Sensitivity ◽  
Complex Film

Metal-oxide based ammonia gas sensors: A review

2020 ◽  
Vol 10 ◽  
Author(s):  
Priya Gupta ◽  
Savita Maurya ◽  
Narendra Kumar Pandey ◽  
Vernica Verma
Keyword(s):  
Metal Oxide ◽  
Metal Oxides ◽  
Gas Sensor ◽  
Gas Sensors ◽  
Review Paper ◽  
Gas Sensing ◽  
Gas Sensitivity ◽  
Ammonia Gas ◽  
Ammonia Sensing ◽  
Ammonia Gas Sensors

: This review paper encompasses a study of metal-oxide and their composite based gas sensors used for the detection of ammonia (NH3) gas. Metal-oxide has come into view as an encouraging choice in the gas sensor industry. This review paper focuses on the ammonia sensing principle of the metal oxides. It also includes various approaches adopted for increasing the gas sensitivity of metal-oxide sensors. Increasing the sensitivity of the ammonia gas sensor includes size effects and doping by metal or other metal oxides which will change the microstructure and morphology of the metal oxides. Different parameters that affect the performances like sensitivity, stability, and selectivity of gas sensors are discussed in this paper. Performances of the most operated metal oxides with strengths and limitations in ammonia gas sensing application are reviewed. The challenges for the development of high sensitive and selective ammonia gas sensor are also discussed.

scholarly journals The Adsorption and Sensing Performances of Ir-modified MoS2 Monolayer toward SF6 Decomposition Products: A DFT Study

Nanomaterials ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 100
Author(s):  
Hongcheng Liu ◽  
Feipeng Wang ◽  
Kelin Hu ◽  
Tao Li ◽  
Yuyang Yan ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Density Functional ◽  
Gas Adsorption ◽  
Dft Method ◽  
Orbital Theory ◽  
Gas Sensitivity ◽  
Decomposition Products ◽  
Mos2 Monolayer ◽  
Characteristic Decomposition ◽  
Sensing Material

In this paper, the Ir-modified MoS2 monolayer is suggested as a novel gas sensor alternative for detecting the characteristic decomposition products of SF6, including H2S, SO2, and SOF2. The corresponding adsorption properties and sensing behaviors were systematically studied using the density functional theory (DFT) method. The theoretical calculation indicates that Ir modification can enhance the surface activity and improve the conductivity of the intrinsic MoS2. The physical structure formation, the density of states (DOS), deformation charge density (DCD), molecular orbital theory analysis, and work function (WF) were used to reveal the gas adsorption and sensing mechanism. These analyses demonstrated that the Ir-modified MoS2 monolayer used as sensing material displays high sensitivity to the target gases, especially for H2S gas. The gas sensitivity order and the recovery time of the sensing material to decomposition products were reasonably predicted. This contribution indicates the theoretical possibility of developing Ir-modified MoS2 as a gas sensor to detect characteristic decomposition gases of SF6.

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