Highly enhanced sensitivity of optical oxygen sensors using microstructured PtTFPP/PDMS-pillar arrays sensing layer

Mao, Yongyun; Gao, Yibo; Wu, Shanshan; Wu, Shitong; Shi, Jiayan; Zhou, Bingpu; Tian, Yanqing

doi:10.1016/j.snb.2017.05.081

Cited by 38 publications

(22 citation statements)

References 51 publications

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“…The PtTFPP molecule in the single-excited state (S 1 ) will transition to its adjacent vibrational energy level T 1 by means of intersystem conversion (I SC ). In the absence of oxygen, a molecule in the T 1 energy level will likewise return to the ground state by radiative transition, emitting light with a central wavelength of about 645 nm [ 15 , 16 , 17 ]. With the existence of quencher oxygen, the energy is transferred from the phosphors dye of PtTFPP to the oxygen, and, thus, no phosphorescence is emitted out.…”

Section: Resultsmentioning

confidence: 99%

“…Platinum(II) meso-tetrakis(pentafluorophenyl)porphyrin (PtTFPP) is one of the ideal phosphorescence dyes that is generally used as the main component of the sensing membrane, because it is resistant to fading, sufficiently photostable and exhibits suitable quenching sensitivity to dissolved oxygen [ 15 , 16 ]. To achieve low limit of detection (LOD), high sensitivity and fast response recovery, the DO sensor’s sensing membrane should exhibit sizeable specific surface, and the polymer substrate of the sensing membrane should have high accessibility of gas molecules [ 17 , 18 ]. Performance of the traditional flat sensing film based on PtTFPP/polydimethylsiloxane (PDMS) is usually unsatisfying, due to the limited surface area.…”

Section: Introductionmentioning

confidence: 99%

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A Phosphorescence Quenching-Based Intelligent Dissolved Oxygen Sensor on an Optofluidic Platform

Wang

Zhu

et al. 2021

Micromachines

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Continuous measurement of dissolved oxygen (DO) is essential for water quality monitoring and biomedical applications. Here, a phosphorescence quenching-based intelligent dissolved oxygen sensor on an optofluidic platform for continuous measurement of dissolved oxygen is presented. A high sensitivity dissolved oxygen-sensing membrane was prepared by coating the phosphorescence indicator of platinum(II) meso-tetrakis(pentafluorophenyl)porphyrin (PtTFPP) on the surface of the microfluidic channels composed of polydimethylsiloxane (PDMS) microstructure arrays. Then, oxygen could be determined by its quenching effect on the phosphorescence, according to Stern–Volmer model. The intelligent sensor abandons complicated optical or electrical design and uses a photomultiplier (PMT) counter in cooperation with a mobile phone application program to measure phosphorescence intensity, so as to realize continuous, intelligent and real-time dissolved oxygen analysis. Owing to the combination of the microfluidic-based highly sensitive oxygen sensing membrane with a reliable phosphorescent intensity detection module, the intelligent sensor achieves a low limit of detection (LOD) of 0.01 mg/L, a high sensitivity of 16.9 and a short response time (22 s). Different natural water samples were successfully analyzed using the intelligent sensor, and results demonstrated that the sensor features a high accuracy. The sensor combines the oxygen sensing mechanism with optofluidics and electronics, providing a miniaturized and intelligent detection platform for practical oxygen analysis in different application fields.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Phosphorescence Quenching-Based Intelligent Dissolved Oxygen Sensor on an Optofluidic Platform

Wang

Zhu

et al. 2021

Micromachines

View full text Add to dashboard Cite

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“…In many oxygen-sensing cases, the intensity from the Stern–Volmer equation with dynamic quenching can be described by the formula 1where I 0 is the value in the absence of the quencher, I is the phosphorescence intensity under different oxygen concentrations [O 2 ], and k sv is the Stern–Volmer constant. 3 Generally, in an ideal quencher system, there is a linear relationship between I 0 / I and the oxygen concentration, described as formula 1. However, many cases showed that downward Stern–Volmer plots (SVPs) originate from the heterogeneity of the microenvironment of the oxygen-sensing probes.…”

Section: Resultsmentioning

confidence: 99%

“…Thus, the AgNWs@PdOEP–PMMA microfiber mats can be utilized for the easy identification of O 2 concentration by the naked eyes or monitoring of the unsteady pressure measurement and unsteady flow visualization. 3,10…”

Section: Resultsmentioning

confidence: 99%

Silver Nanowire-Induced Sensitivity Enhancement of Optical Oxygen Sensors Based on AgNWs–Palladium Octaethylporphine–Poly(methyl methacrylate) Microfiber Mats Prepared by Electrospinning

et al. 2018

Self Cite

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Sensitivity enhancement of optical oxygen sensors is crucial for the characterization of nearly anoxic systems and oxygen quantification in trace amounts. In this work, for the first time we presented the introduction of silver nanowires (AgNWs) as a sensitivity booster for optical oxygen sensors based on AgNWs–palladium octaethylporphine–poly(methyl methacrylate) (AgNWs@PdOEP–PMMA) microfiber mats prepared by electrospinning. Herein, a series of sensing microfiber mats with different loading ratios of high aspect ratio AgNWs were fabricated, and the corresponding sensitivity enhancement was systematically investigated. With increasing incorporated ratios, the AgNWs@PdOEP–PMMA-sensing microfiber mats exhibited a swift response (approx. 1.8 s) and a dramatic sensitivity enhancement (by 243% for the range of oxygen concentration 0−10% and 235% for the range of oxygen concentration 0–100%) when compared to the pure PdOEP–PMMA microfiber mat. Additionally, the as-prepared sensing films were experimentally confirmed to be highly photostable and reproducible. The advantages of AgNW-induced sensitivity enhancement could be useful for the rational design and realization of revolutionary highly sensitive sensors and expected to be readily applicable to many other high-performance gas sensor devices.

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“…This sensor is enhanced by tuning the spacing between fluorophore layers by the introduction of poly(acrylic acid) between the cationic layers, with the purpose of avoiding optimizing sensors and avoiding self‐quenching in term of linearity and sensitivity of the calibration curves . Mao et al fabricated a novel optical O 2 sensors using micro‐structured pillar sensing layers arrays, which exhibited significantly enhanced sensitivity. The detection limit of O 2 was very low (0.10 μmol/L) that enables the ultrasensitive sensor film to be reliably used for monitoring dissolved O 2 within nanomolar concentration ranges.…”

Section: Sensors Used In Meat Industrymentioning

confidence: 99%

An overview of smart packaging technologies for monitoring safety and quality of meat and meat products

et al. 2018

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The food packaging sector has experienced much development since its inception. In the past few decades, innovations in packaging sector have led to the development of smart packaging (SP) systems that carve a niche in a highly competitive food industry. SP systems have great potential for improving the shelf‐life, and safety of food products apart from their basic roles of protecting the products against unwanted biological, chemical, and physical damage and keeping them clean. Indicators and sensors, SP components, are used for real‐time monitoring of meat quality and subsequently inform the retailers and consumers about the freshness, microbiological, temperature, and shelf life status of the products. Barcodes and radio‐frequency identification tags are employed in meat packaging for real‐time information about the authenticity, and traceability of the products in the supply chain. Recently, innovations in SP technologies resulted in fast, sensitive, and effective detection, sensing, and record keeping of freshness, microbiological, and shelf life status of meat and meat products. The SP system shows promise for extensive utilization in the meat industry in response to the consumer appreciation for safe, and quality meat products, as well as their waste reduction notions. This paper gives an updated overview of ongoing scientific research, and recent technological advances that offer the perspectives of developing smart meat packaging systems that are capable of monitoring the physical, microbial, and chemical changes of the package contents from producer to the point of sale and even beyond, and remediating potential adverse reactions.

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Highly enhanced sensitivity of optical oxygen sensors using microstructured PtTFPP/PDMS-pillar arrays sensing layer

Cited by 38 publications

References 51 publications

A Phosphorescence Quenching-Based Intelligent Dissolved Oxygen Sensor on an Optofluidic Platform

A Phosphorescence Quenching-Based Intelligent Dissolved Oxygen Sensor on an Optofluidic Platform

Silver Nanowire-Induced Sensitivity Enhancement of Optical Oxygen Sensors Based on AgNWs–Palladium Octaethylporphine–Poly(methyl methacrylate) Microfiber Mats Prepared by Electrospinning

An overview of smart packaging technologies for monitoring safety and quality of meat and meat products

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