Low-cost surface micromachined microhotplates for chemiresistive gas sensors

In this work, we investigate the electrospray technique for the preparation of graphene layers for use in chemiresistive gas sensors. A dispersion of reduced graphene oxide (rGO) in isopropyl alcohol (0.1 mg/mL) is electrosprayed and the rGO flakes are deposited onto a polymeric substrate with printed interdigitated electrodes. The surface area of the substrate covered with rGO is mainly determined by the distance between the needle and the substrate, while the rGO deposition pattern strongly depends on the flowrate and the applied voltage. Homogeneous layers of rGO are obtained in a stable cone-jet regime, and the room temperature detection behavior of the sensors towards NO2, O3 and CO is assessed. The sensors were not capable of detecting CO (up to 5 ppm), but they detected 0.2 ppm NO2 and 0.05 ppm O3. The results are encouraging regarding the use of electrospray for the production of low-cost and low-power gas sensors based on graphene for air quality applications.

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Chemiresistive Gas Sensors Based on Conducting Polymers

Handbook of Research on Nanoelectronic Sensor Modeling and Applications - Advances in Computer and Electrical Engineering ◽

10.4018/978-1-5225-0736-9.ch006 ◽

2017 ◽

pp. 150-180 ◽

Cited By ~ 1

Author(s):

Sajad Pirsa

Keyword(s):

Surface Modification ◽

Gas Sensor ◽

Conducting Polymer ◽

Gas Sensors ◽

Low Cost ◽

Portable Devices ◽

Response Mechanism ◽

Fast Detection ◽

Chemiresistive Gas Sensors ◽

Change Response

Chemiresistive gas sensor based on conducting polymer is a type of sensors that presents gas sensors with excellent characters; low-cost fabrication, fast detection, simultaneous determination (array gas sensor), portable devices and so. Theses gas sensors are commonly based on polyaniline (PANI), polypyrrole (PPy), polythiophene (PTh) and their derivatives as a transducer. Common configuration and response mechanism of these sensors are reported in this section. Some factors that induce selectivity to these sensors are discussed. Different materials (conductor or insulant) can be used as a substrate of polymerization. Type of substrate, selective membranes, surface modification of conducting polymer and so can change response behavior of these sensors.

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Chemiresistive Gas Sensors Based on Conducting Polymers

Materials Science and Engineering ◽

10.4018/978-1-5225-1798-6.ch022 ◽

2017 ◽

pp. 543-574

Author(s):

Sajad Pirsa

Keyword(s):

Surface Modification ◽

Gas Sensor ◽

Conducting Polymer ◽

Gas Sensors ◽

Low Cost ◽

Portable Devices ◽

Response Mechanism ◽

Fast Detection ◽

Chemiresistive Gas Sensors ◽

Change Response

Chemiresistive gas sensor based on conducting polymer is a type of sensors that presents gas sensors with excellent characters; low-cost fabrication, fast detection, simultaneous determination (array gas sensor), portable devices and so. Theses gas sensors are commonly based on polyaniline (PANI), polypyrrole (PPy), polythiophene (PTh) and their derivatives as a transducer. Common configuration and response mechanism of these sensors are reported in this section. Some factors that induce selectivity to these sensors are discussed. Different materials (conductor or insulant) can be used as a substrate of polymerization. Type of substrate, selective membranes, surface modification of conducting polymer and so can change response behavior of these sensors.

Download Full-text