Із застосуванням золь-гель технології отримано напівпровідникові нанорозмірні матеріали на основі SnO2 та Pt/SnO2. Вивчено морфологію, фазовий склад та каталітичну активність у реакції окиснення СО одержаних наноматеріалів. Встановлено, що допування діоксиду олова платиною приводить до значного підвищення каталітичної активності матеріалів у реакції окиснення СО. Встановлено, що сенсори, створені на основі наноматеріалів Pt/SnO2, виявляють достатньо високу чутливість до 1000 ррm CO та мають хорошу швидкодію.
С использованием золь-гель технологии получены полупроводниковые наноразмерные материалы на основе SnO и Pt/SnO2. Изучено морфологию, фазовый состав и каталитическую активность в реакции окисления СО полученных наноматериалов. Установлено, что допирование диоксида олова платиной приводит к значительному повышению каталитической активности материалов в реакции окисления СО. Доказано, что сенсоры, изготовленные на основе наноматериалов Pt/SnO2, проявляют достаточно высокую чувствительность к 1000 ppm CO и имеют хорошее быстродействие
Nanosized material SnO2 was obtained by a sol-gel technique to create a sensor purposed for determination of carbon monoxide concentration in air. Platinum was added to the nanosized tin dioxide by a wet impr&egnation method using H2PtCl6 solution. According to TEM data the average size of the SnO2 particles in the obtained nanosized tin dioxide was equal to 10-11 nm. Sensor nanomaterials based on SnO2 and Pt/SnO2 powders which were sintered at 620°C in a&ir consisted of spheric particles with average sizes 20 and 14-15 nm, correspondingly. Phase compositions of the obtained nanomaterials were studied by the XRD method. Only a phase of cassiterite was detected for the nanomaterials with and without pl&atinum. The absence of any reflexes of platinum-containing phases in the diffraction pattern of Pt/SnO2 is most likely due to the low content of platinum in the material. It was shown that dopping the nanosized SnO2 materials by platinum lead to incr&ease their catalytic activities in the reaction of CO oxidation: the temperature of practically complete conversion of CO at Pt/SnO2 catalyst was equal to 110 °С. The sensor created on the base of Pt/SnO2 nanomaterial was found to be more sensitive t&o CO than the one created without platinum in the range of its heater power consumption 0.25-0.45 W. High catalytic activity of the Pt/SnO2 nanomaterial in the reaction of CO oxidation is a reason of such sensor sensitivity increase. The dependence o&f the sensitivity of the sensor on the heater power consumption has a maximum that can be explained by the change of the amount of oxygen chemisorbed on the sensor gas sensitive layer when the sensor temperature is increased. The maximal sensor sensi&tivity to CO is ? = 10 at the optimal heater power consumption of the sensor (0.3 W). The created sensor to CO based on the nanomaterial Pt/SnO2 was found to be very fast. The response time of the sensor (?0,9) was equal to 4,5 s and the relax time (&?relax) was equal to 9.8 s. It was shown that the created sensor based on nanomaterial Pt/SnO2 has high sensitivity to carbon monoxide and possess good dynamic properties, which makes the sensor to be promising for usage it in gas analytical devices &purposed for determination of CO in air.
