Ultra-sensitive IDE-based ammonia sensor fabricated using green synthesized graphene nanoplatelets and a TiO2 based
Anita R Patel1, Vishwa Padia1, Pruthvi Patel1
1Dr. K C Patel R and D Centre, Charotar University of Science and Technology (CHARUSAT) Changa 388421 Anand India vanarajsolanki.rnd@charusat.ac.in miteshpatel.bio@charusat.ac.in.
Abstract:
The development of a reliable, sensitive, and economical gas sensor is crucial for effective environmental monitoring. In this study, we present the development of an interdigitated electrode (IDE) based graphene nanoplatelet (GnP) and GnP-TiO2 composite NH3 gas sensor operated at room temperature. Firstly, for the synthesis of GnPs, tea extract was used as a green alternative without the use of organic solvents using a kitchen mixer, whereas TiO2 and GnP-TiO2 were prepared via a simple hydrothermal process. An IDE-based chemiresistive sensor of GnPs and GnP-TiO2 was tested for NH3 detection over a wide concentration range of 100 ppb to 100 ppm at room temperature. The GnP-TiO2 composite exhibited a response nearly eight times higher than that of the GnP sensor at 100 ppm NH3. Additionally, the GnP sensor exhibited response and recovery times of 249 and 107 s, respectively, whereas the GnP-TiO2 composite achieved 15 and 30 s, corresponding to an ∼17 fold faster response time and ∼3.5 fold quicker recovery at 100 ppb NH3. Overall, this study advocates the applicability of a grown GnP-TiO2 based composite for NH3 sensing application in ppb level concentration.
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