<p>With distinctive microstructure and exceptional electrical properties, graphene, an emerging thermoelectric material, has recently received wide attention. Graphene based temperature sensors of three different lengths 1.5 cm (S₁), 2.5 cm (S₂), and 3.5 cm (S₃) were fabricated on a flexible polyimide (PI) substrate using laser induced graphene (LIG). The resistance changes exhibited by these sensors were measured to evaluate their temperature dependence. Within the range of − 5 to 80&#xa0;°C, a linear response with a negative temperature coefficient (NTC) behavior, characteristic of semi-metals was observed. The average temperature coefficient of resistance (TCR) values calculated for sensors S₁, S₂, and S₃ were − 0.056%, − 0.052%, and − 0.046% per °C. Among the fabricated sensors, S₁ provided the highest sensitivity, a TCR of − 0.056% °C⁻¹, and was thus the most sensitive configuration for temperature monitoring. The fabricated sensors were used as a voltage divider circuit to convert the resistance into an electrical signal by using a variable resistance, matched to the sensor value. Results show that LIG based temperature sensors have favorable thermal and electrical properties, making them suitable for application in flexible electronics and environmental monitoring system. </p>