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J. Dobroczyńska and K. Grabas

Abstract

Nowadays, a good deal of research is focusing on the development of new analytical procedures for detection of hazardous agents, such as bacteria, harmful pollutants, toxic vapors, and many others. The majority of the research is aimed at developing new sensors and analytical equipment. This paper demonstrates a simple construction of an ammonia sensor based on commercially available electronic connectors with active elements from polyaniline. The main goal of this research is to present the simplicity of sensor manufacturing, without the need for advanced apparatus such as electropolymerization or electrospinning set-up. The active element of the proposed sensor is composed of polyaniline synthesized in situ on the surface of conductive glue. The layer of the conductive glue is a key element in this sensor as it protects the metallic pin against destruction during in situ synthesis of polyaniline (acidic and oxidizing conditions).

Open access

R.B. Pedhekar, F.C. Raghuwanshi and V.D. Kapse

1 Introduction Liquid petroleum gas (LPG) is highly inflammable as it mainly consists of butane mixed with compounds of sulfur (methyl mercaptan and ethyl mercaptan) which have foul smell. It is hazardous because an explosion might be caused when it leaks accidentally. It has been reported that the concentration level of LPG noticeable by smell is higher than the lowest explosive limit of the gas in air. As it is used for both domestic and industrial purposes there is a great rise in demand for gas sensors to monitor the concentration level of LPG