Portable optical oxygen sensor based on time-resolved fluorescence

Abstract

A new, simple signal processing, low-cost technique for the fabrication of a portable oxygen sensor based on time-resolved fluorescence is described. The sensing film uses the oxygen sensing dye platinum meso-tetra (pentfluorophenyl) porphyrin (PtTFPP) embedded in a polymer matrix. The ratio τ₀/τ₁₀₀ measures sensitivity of the sensing film, where τ₀ and τ₁₀₀ represent the detected fluorescence lifetimes from the sensing film exposed to 100% nitrogen and 100% oxygen, respectively. The experimental results reveal that the PtTFPP-doped oxygen sensor has a sensitivity of 2.2 in the 0%-100% range. A preparation procedure for coating the photodiodes with the oxygen sensor film that produces repetitive and reliable sensing devices is proposed. The developed time-resolved optical oxygen sensor is portable, low-cost, has simple signal processing, and lacks optical filter elements. It is a cost-effective alternative to traditional electrochemical-based oxygen sensors and provides a platform for other optical based sensors.

Molecular design and architectonics towards film-based fluorescent sensing

“…Chu et al fabricated a portable oxygen sensor by embedding an O 2 -sensitive transition-metal complex into a polymer matrix. 157 The lifetime ratio ( τ 0 / τ 100 ) of the film changed as the film was exposed to O 2 with different concentrations. This strategy provides a simple and low-cost way for the fabrication of stable and portable luminescent sensors.…”

An inherently dangerous fluid warmer design

“…The sensor would emit an alarm should fluorescence be detected in the inner lumen of the fluid warming set. While such technology has been described [14,15], we recognize that modification of the Hotline® to this extent may be impractical and cost-prohibitive.…”

MOF-derived electrochemical catalyst Cu–N/C for the enhancement of amperometric oxygen detection

“…13 With regard to optical sensors, the complicated sensing systems and structures limit their fields of application. 14,15 Relatively, amperometric electrochemical sensors are superior owing to the virtues of tiny size, high accuracy and convenient operation, and are the most commonly used oxygen sensors to date. 16 Different amperometric electrochemical sensors have been derived in terms of the type of electrolyte such as solid electrolyte sensors, aqueous electrolyte sensors and ionic liquid sensors.…”