BARC/PUB/2019/1272

 
 

Performance evaluation of Ce3+doped flexible PVDF fibers for efficientoptical pressure sensors

 
     
 
Author(s)

Hernandez, C.; Gupta, S. K.; Zuniga, J. P.; and others
(RCD)

Source

Sensors and Actuators A, 2019. Vol. 298: Article no. 111595

ABSTRACT

This work proposes a highly novel centrifugally spun lanthanide doped nonwoven fibrous mat as anon-contact optical pressure sensor with a wide linear dynamic range and good pressure sensitivity.The sensor properties are based on the spectral shift, broadening and intensity enhancement of Ce3+ ion in Ce doped PVDF fiber upto significantly high pressure. Two different systems: Ce(NO3)3·6H2Oand (NH4)4Ce(SO4)4·2H2O doped PVDF flexible fibers (CeN-PF and CeS-PF) were produced using the Forcespinning® technique. Both CeN-PF and CeS-PF fibers displayed violet-blue emission under UV irra-diation due to a 5d-4f transition of Ce3+ ions. Our emission results show that both CeN-PF and CeS-PF spectral characteristics are influenced by high pressures, inducing significant spectral ref shift in 5d-4f. The pressure-induced monotonous changes in bandwidth and emission intensity enhancement along with red shift suggesting the potential application of these fibers for pressure sensing applications. The CeN-PF fiber exhibits a high-pressure sensitivity (dλ/dP ≈ 0.28 nm/GPa) under a comprehensive linear dynamic range (0–64 GPa) with no pressure-induced luminescence quenching. The changes in CeS-PFis less pronounced with a lower pressure sensitivity of 0.10 nm/GPa compared to CeN-PF due to largecrystal field splitting energy of nitrate ion compared to sulphate ion. This work presents a highly effi-cient, cost effective, scalable lanthanide doped flexible fibrous based system with negligible high pressurequenching and a wider linear dynamic range for optical pressure sensing applications.

 
 
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