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Proceedings ArticleDOI

Live Demonstration of Alcohol Prototype for Drunken Drive Case

01 Oct 2018-

TL;DR: This demo will demonstrate a real-time lab prototype which will detect level of alcohol in human breath, which will be extremely useful to traffic police for keeping vigilance on drink and drive cases.

AbstractIn recent times ‘drink and drive’ is one of the major causes for highway accidents. These types of accidents occur due to drowsiness when the drunk driver is unable to control the vehicle. Alcohol breathalyzer is one of the essential devices which uses non-invasive technique to measure the content of alcohol in human breath and correlates to the alcohol concentration in the blood. As per the National and International standards, a driver is found guilty if the alcohol content in his breath is found to be ≥ 700 ppm. It is therefore, required for this sensor to be efficiently detecting alcohol in low levels at room temperature. Apart from this, few other desirable parameters of a sensor are selectivity, stability, repeatability and low power consumption. In this demo, we will demonstrate a real-time lab prototype which will detect level of alcohol in human breath. This kind of device will be extremely useful to traffic police for keeping vigilance on drink and drive cases. more

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Journal ArticleDOI
Abstract: A miniaturized prototype sensor based on TiO2 nanotubes/porous silicon (PS) heterojunction is developed for selective ethanol sensing in sub-ppm range. Titanium (Ti) of thickness ∼ 200 nm was deposited on PS using RF sputtering technique. Both silicon and Ti were sequentially anodized to form PS and nanotubes respectively. Electrical contacts for testing of resistive sensors were fabricated using lift off process. The sensor was packaged onto a 12-pin header and tested in presence of different VOCs with concentration ranging from 0.5 to 100 ppm. The selective ethanol sensing at around 150 °C stems from the formation of TiO2 nanotubes/PS heterojunction. The sensitivity of such a sensor, improved manifold in comparison to the response of pure PS and pure TiO2 based sensors. The formation of heterojunction, selective response to ethanol, sub-ppm level sensing at comparatively low operating temperature is discussed. The study unfolds the collective properties of TiO2/PS heterojunction and demonstrates the potential of wafer scale integrated repeatable ethanol sensor tested at sub-ppm level.

37 citations

Journal ArticleDOI
Abstract: Room temperature operated sensor for detection of alcohol vapours in low ppm range based on TiO 2 functionalized nano-porous silicon (PSi) is demonstrated. The effect of functionalization by TiO 2 on PSi is investigated using SEM, EDX, Raman spectroscopy, XRD and contact angle measurements. Sensing is accomplished by measuring change in resistance of the sensing layer using Cr-Au inter-digitated-electrode (IDE) structure formed on top of the functionalized PSi layer. The sensors were tested for volatile organic compounds (VOCs) and water vapours in the wide range of 5–500 ppm concentration at room temperature. Functionalization of the nanostructured PSi by sputter deposited TiO 2 results in significant enhancement of sensitivity and inverse change in selectivity. PSi sensors have displayed strong response to water vapours whereas after functionalization, selective sensing to ethanol is depicted. Minimum detection by PSi sensors is portrayed at 100 ppm and that of functionalized sensors is at 10 ppm. Sensing mechanism is explained on the basis of surfaces and structures of both PSi and TiO 2 . This study incites the importance of surface treatment of PSi for tuning the sensing properties and is useful in the development of selective alcohol sensors.

23 citations

Journal ArticleDOI
Abstract: This paper presents the selective and highly sensitive performance of porous TiO2/nano-Si heterostructure for ethanol sensing. The fabrication steps involved were scalable and reproducible making the device eligible for batch fabrication suitable for industry production. The sensor response was recorded as a change in resistance upon exposure to a variety of organic vapors in the concentration range of 5–500 ppm and in simulated real breath conditions. Although the response was obtained at room temperature, however, the operating temperature of the sensor was found to be around 100 °C. The sensing mechanism has been explained on the basis of adsorption–desorption theory of gases, physical, and chemical properties of the materials. A prototype was built for complete realization of the sensor. The sensor data from the sensor array comprising of hetersostructure and its single-layer counterparts were collated and signal conditioning like Regression model and PCA was done. These were used for assessing the alcohol concentration and separation of analytes for the development of E-nose system.

5 citations