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Reduced Graphene Oxide-Silver Nanocomposite Films For Temperature Sensor Application

The present invention relates to nanocomposite comprising reduced Graphene oxide and silver nanoparticles; a method of synthesis of nanocomposite and fabrication of nanocomposite film on a substrate for sensor applications based on the principle of negative temperature coefficient (NTC) of piezoresistive temperature sensing elements. The senor presented (figure 1(a)) shows negative temperature coefficient (NTC) of -1.64 × 10-3 Ω / Ω / K, sensitivity of 0.5553 Ω / K, with a nonlinearity of about 1% and hysteresis close to 1% as shown in figure 1(a). The measured response time (470 m sec) of this sensor is much faster than majority of commercially available temperature sensors with good repeatability and stability. The linearity of the developed sensor lends itself for simpler signal conditioning circuits without requiring linearization front end. The temperature sensors are playing a key role in various fields, mainly in the biomedical (for body temperature monitoring, infant incubators, drugs quality monitoring from hospitals to end users), food science (for packaged food quality monitoring from industry to the market), automotive ( engine block/oil monitoring,  intake & outside air monitoring), electronics & communication(for rechargeable battery packs life monitoring, cellular telephone, refrigerator & freezer temperature control, integrated electronic circuits, micro heaters and gas sensors), military & aerospace (space craft temperature monitoring, satellites, physiological monitoring) and weather/environmental applications(for weather forecast).

Figure.1: (a) Schematic view of Graphene-Ag nanocomposite-based Temperature Sensor and inset shows photograph of the fabricated Sensor, (b) the resistance change with respect to the applied temperature exhibits the linear relationship in the year 2014 and 2016.

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