Abstract
The application of metal oxide gas sensors in Internet of Things (IoT) devices and mobile platforms like wearables and mobile phones offers new opportunities for sensing applications. Metal-oxide (MOx) sensors are promising candidates for such applications, thanks to the scientific progresses achieved in recent years. For the widespread application of MOx sensors, viable commercial offerings are required. In this publication, the authors show that with the new Sensirion Gas Platform (SGP) a milestone in the commercial application of MOx technology has been reached. The architecture of the new platform and its performance in selected applications are presented.
Highlights
We are in the midst of the so-called sensor revolution: the Internet of Things (IoT), comprising smart appliances and smart gadgets, as well as ever more powerful wearable and mobile consumer devices fuel the demand for smarter sensor solutions
While the broadband sensitivity of MOx sensors is beneficial for the detection of a wide variety of volatile organic compounds (VOC) in indoor air-quality (IAQ) monitoring, it is a limitation in applications which require a certain level of selectivity to specific gases
MOx-based gas sensors suffer from poor long-term stability when they are operated in atmospheres containing even very low concentrations of siloxanes [6,7,8]
Summary
We are in the midst of the so-called sensor revolution: the Internet of Things (IoT), comprising smart appliances and smart gadgets, as well as ever more powerful wearable and mobile consumer devices fuel the demand for smarter sensor solutions. There is a growing demand for personal and affordable air-quality monitoring solutions. Commercially available metal-oxide (MOx) sensors had technical shortcomings which limited their usage in many interesting applications. Even though the selectivity of MOx sensors can be tuned and notably improved, long-term stability in the presence of siloxanes will deteriorate their accuracy over time or even make it impossible to use sensors in applications with high siloxane loads such as mobile phones [6,7,8]. Many of the available solutions are not suited for mobile applications due to their size and prohibitive power consumption. While the broadband sensitivity of MOx sensors is beneficial for the detection of a wide variety of volatile organic compounds (VOC) in indoor air-quality (IAQ) monitoring, it is a limitation in applications which require a certain level of selectivity to specific gases. Among the different approaches to improve selectivity [6,9,10,11,12,13,14,15,16,17,18,19,20,21], temperature modulation [8,10,22,23] and combination of multiple sensing elements with different intrinsic selectivity [8,10] are promising approaches to improve the selectivity of MOx sensors
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