DEVELOPMENT OF HIGH-SENSITIVE HYDROGEN SENSORS OF SCHOTTKY DIODES BASED ON n-GaAs NANO LAYERS
Journal Title: Вісник Кременчуцького національного університету імені Михайла Остроградського - Year 2018, Vol 1, Issue 109
Abstract
Purpose. To research porous semiconductor materials which have unique chemical and physical properties due to their extremely small size and large surface-to-volume ratio, so they open up alternative possibilities for their various potential applications in optoelectronics, chemical and biochemical probing. Areas of use of porous gallium arsenide include the definition of biomarkers in medicine for early non-invasive diagnosis of diseases. Methodology. The sensitivity depends on the microstructure of the porous GaAs. The authors produced two types of hydrogen sensors based on the Schottky diode. Pd was deposited into two different GaAs structures, which were used as Pd / GaAs and Pd / porous-GaAs hydrogen sensors. Results. It was found that the porosity of the hydrogen-sensitive Pd / porous-GaAs contact of the Schottky diode affects the speed and sensitivity of the sensor. Pores in the Pd / po-rous-GaAs sensor increase the rate of hydrogen penetration compared to the Pd / GaAs co-pact. Even at room temperature and a relatively low hydrogen concentration (500 ppm), an increase in sensitivity of the Pd / porous-GaAs sensor was observed. The response time was less than 1 s and the sensitivity of the sensor was about 93.5% to the relative concentration of 25% hydrogen for the Pd / porous-GaAs sample, which works at room temperature. How-ever, the recovery time has been observed for a long time for about 4-5 minutes. As a result of the growth of electron microscopy and photoluminescence, the high efficiency of the Pd / porous-GaAs sensor depends on the GaAs porosity. Originality. The results of the volt-ampere characteristics of the sample Pd / porous-GaAs confirmed the increase in sensitivity at room temperature from 6.0 × 10-7 A to 9.0 × 10-6 A. In addition, the reaction time Pd / porous-GaAs, which showed the perspectivity of the application of this material as a hydrogen microsensor. The practical value. The main advantage of the sensor obtained is the ability to operate at a temperature of the temperature. It is shown that porous GaAs are suitable for measuring the concentration of hydrogen, which can be easily integrated into the chip as an intelligent sensor of hydrogen.
Authors and Affiliations
А. Oksanich, М. Kogdas, O. Holod, M. Maschenko
Keywords
Related Articles
- EP ID EP659613
- DOI 10.30929/1995-0519.2018.2.p1.9-14
- Views 73
- Downloads 0
DEVELOPMENT AND INTEGRATION OF MATHEMATICAL PLUGINS FOR DISTANCE LEARNING SYSTEMS BASED ON MOODLE CMS
Purpose. To confirm that implementation of distance learning in the field of computer science has some additional requirements: the need of representation mathematical formulas in all browsers and mobile devices, the...
DESIGNING OF ELECTROMAGNETIC SYSTEMS FOR PULLEY SEPARATORS. PART 3. ALGORITHM OF SYNTHESIS OF ELECTROMAGNETIC SYSTEM OF PULLEY SEPARATOR
Purpose.The problem of synthesis of an electromagnetic system of a pulley separator is formulated, as the problem of determining such sizes of poles and magnetizing winding, which ensure creation by the designed device a...
MODEL AND METHOD OF A MULTI-LEVEL RECOGNITION SYSTEM CONSTRUCTION
Purpose. To consider existing approaches to the construction of recognition systems. The task of pattern recognition can be solved step by step, if in the analysis of data, hierarchical structures are distinguished in th...
VIBRATION AND VIBRO-IMPACT POWER LOAD IN MECHANICAL TESTS OF MACHINE PARTS AND UNITS
Purpose. To form a scientifically grounded method and type of mechanical testing with the help of vibrating and vibroimpact loading based on the results of theoretical and experimental studies of the operation of machine...
FUNDAMENTALS OF CONSTRUCTION OF EXPLOSIVE MATERIAL EXPLOSION-PROOF PRODUCTION TECHNOLOGY
Purpose. To establish hazard criteria in the production of explosive materials, to identify directions and ways to improve labour safety in the manufacture of explosives and their initiating means, as well as perspective...