Nanorod based oxygen sensor working at room temperature can save lives in places like underground mines, higher altitudes

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Nanorod based oxygen sensor
Nanorod based oxygen sensor
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Nanorod based oxygen sensor working at room temperature can save lives in places like underground mines, higher altitudes

By PIB Delhi

Indian Scientists have developed a nanorods-based oxygen sensor which works at room temperature with assistance of UV irradiation and can detect oxygen gas concentrations in places such as underground mines, at higher altitudes, inside aeroplanes and research labs.

Monitoring O2 concentration in very low ppm-level is of paramount importance, and a fast and selective oxygen sensor working at room temperature can save lives in places like underground mines, higher altitudes and improve the accuracy of numerous experiments being conducted in research labs.

A team of scientists led by Dr S. Angappane, a Scientist at the Centre for Nano and Soft Matter Sciences (CeNS), an autonomous research institute under the Department of Science & Technology, Government of India, have fabricated a metal oxide semiconductor (MOS) nanorods array-based oxygen sensor which works at room temperature with assistance of UV irradiation and can detect broad ppm range of oxygen gas concentrations. They used titanium oxide for the purpose and work, involving Hiran Jyothilal, Gaurav Shukla, Sunil Walia, and Bharath SP led by Dr S. Angappane, published in the journal Materials Research Bulletin.

The team showed that the sensor gives the best sensitivity with low power consumption and works at room temperature. The fabricated sensors exhibited response and recovery times of around 3 sec and 10 sec, respectively, at 1000 ppm. The sensor works in oxygen concentrations ranging from 25 ppm to 10 lakh ppm (100%) with good stability. The superior sensing property is attributed to the enhanced electrical conductivity, excitons (combination of an electron and a positive hole) created, and desorption of water molecules (released through surface) from the sensor surface by UV irradiation, facilitating increased interaction of oxygen molecules with chromium incorporated in titanium dioxide slanted nanorods array present in the sensor.

The CeNS team is further working on miniaturising the sensor and its electronics interfacing with other gas sensors to fabricate a suitable electronic nose.

Fig: (Top left) An oxygen sensor device used for sensing experiments, (Top right) A room temperature sensing response plot of Cr-TiO2 based oxygen sensor device towards 1000ppm O2, which showed the best sensitivity, (Bottom left) Sensitivity comparison plot of TiO2/Cr-TiO2 based oxygen sensor devices towards different ppm range of O2, (Bottom right) Selectivity plot showing high sensitivity of TiO2/Cr-TiO2 based sensor devices towards O2.

Publication link: https://doi.org/10.1016/j.materresbull.2021.111324

For further details, Dr. S. Angappane (Email: [email protected]) can be contacted.

About Post Author

Suman Munshi

Founder Editor of IBG NEWS (15/Mar/2012- 09/Aug/2018). Recipient of Udar Akash Rokeya Shakhawat Hossain Award 2018. National Geographic & Canon Wild Clicks 2011 jury and public poll winner. Studied Post Graduate Advance Dip in Computer Sc., MBA IT,LIMS (USA & Australia), GxP(USA & UK),BA (Sociology) Dip in Journalism (Ireland), Diploma in Vedic Astrology, Numerology, Palmistry, Vastu Shastra & Feng Sui 25 years in the digital & IT industry with Global MNCs' worked & traveled in USA, UK, Europe, Singapore, Australia, Bangladesh & many other countries. Education and Training advance management and R&D Technology from India, USA, UK, Australia. Over 30 Certification from Global leaders in R&D and Education. Computer Science Teacher, IT & LIMS expert with a wide fan following in his community. General Secretary West Bengal State Committee of All Indian Reporter’s Association
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