Macrotyloma uniflorum proteins as humidity sensing material

C. Tagad, P. Brahmankar, R. Aiyer, S. Sabharwal
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Abstract

For the first time, proteins extracted from a plant source have been used as a humidity sensing material for the development of a humidity sensor. Humidity sensing characteristics of protein composite extracted from the seeds of Macrotyloma uniflorum coated on ceramic rod having built in electrodes were investigated for their electrical behavior as a function of relative humidity. The resistance versus % RH was measured for multiple layers of protein (each layer of 10 µl). Resistance increases slowly with decreasing humidity up to 30%RH followed by drastic increase at the lower range of RH. Humidity sensing range was found to increase with increasing the number of layers of protein, thus with increasing thickness of the coat. Humidity response of the sensor having four layers was found to cover a wide range of (8% to 86%) relative humidity. A five order increase in resistance was observed for change in relative humidity from 86% to 8%RH. The sensor response and recovery time is about 50–60 s and 160 s respectively. The material is characterized by FTIR.
单花巨瘤蛋白作为湿度传感材料
从植物中提取的蛋白质首次被用作湿度传感材料,用于研制湿度传感器。研究了单花巨叶草种子提取蛋白复合材料涂覆在电极陶瓷棒上的湿度传感特性,并对其电学行为与相对湿度的关系进行了研究。测量多层蛋白质(每层10µl)对% RH的抗性。在30%RH以下,随着湿度的降低,阻力增加缓慢,在较低的湿度范围内,阻力急剧增加。湿度感知范围随着蛋白质层数的增加而增加,从而随着涂层厚度的增加而增加。四层传感器的湿度响应覆盖相对湿度(8%至86%)的广泛范围。当相对湿度从86%增加到8%时,电阻增加了5个数量级。传感器的响应时间和恢复时间分别约为50 ~ 60 s和160 s。该材料经FTIR表征。
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