Poly (N-vinylcarbazole)-polypyrrole/graphene oxide nanocomposites based microfiber interferometer for high stability temperature sensor

An all-optical, highly stable temperature sensor based built around Poly (N-vinylcarbazole)-polypyrrole/graphene oxide nanocomposites (PNVC-PPy-GO) deposited on an inline Microfiber Mach-Zehnder interferometer (IMMZI) is investigated and demonstrated. Depositing the PNVC-PPy-GO solution on the IMMZI is seen to enhance the temperature sensing stability, and the resulting wavelength shift as a result of heating the IMMZI with a heating element was linearly proportional to temperature variations, and observed to be stable and uniform. The sensitivity and resolution of the sensor after deposition improves by about 7 pm/°C and 0.18 °C respectively, as compared to the sensor before deposition. The IMMZI with PNVC-PPy-GO coating will be a highly viable candidate for sensing applications requiring highly stable and precise measurements.