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

Abstract

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.

Luminescence and sensitivity enhancement of oxygen sensors through tuning the spectral overlap between luminescent dyes and SiO2@Ag nanoparticles

“…The higher sensitivity and enhancement of fluorescence intensity of MEF-based oxygen sensors can be mainly attributed to the augmentation of emission due to local field enhancement effects and the increased emission rate by surface plasmon coupled emission, which can increase both the quantum yield and the fluorescence intensity. [15][16][17] The local surface plasmon resonance (LSPR) coupled fluorescence enhancement is a complicated process and impacted by a variety of parameters, including sizes and morphologies of the metal nanoparticles (NPs) and dyes, [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33] distance between the metal surface and the dye, [19,20] maximum spectral overlap of the metal LSPR with the excitation spectra and no overlap with emission spectra of the dye. [21] As previous reported by Ozturk, [14] when the absorbance spectra of noble metal NPs overlap with the emission spectra of dyes, the light emitted by the dyes can be re-absorbed by the noble metal NPs, a process called the inner filter effect, resulting in decreased luminescence density.…”

A Dual pH/O2 Sensing Film Based on Functionalized Electrospun Nanofibers for Real-Time Monitoring of Cellular Metabolism

“…The sufficient triplet–triplet energy transfer from the oxygen probes (herein, PtTFPP) to oxygen molecules results in the quenching of the emission of the oxygen probes [ 21 ]. This kind of quenching behavior is influenced by molecules of probes, the structure of matrix or media and the microenvironment in which the probes are located [ 21 ]. The quenching responses of PtTFPP in F3 were tested over a range of DO concentrations.…”

Glucose Sensing in Human Whole Blood Based on Near-Infrared Phosphors and Outlier Treatment with the Programming Language “R”

“… a PdOEP–PMMA: palladium octaethylporphine–poly(methylmethacrylate). The unit of K sv reported in ref ( 39 ) has been converted to atm –1 . …”

“…Comparing the oxygen sensor data at the two sites with the recently reported quenching rate constants, the Ir2* described here has a bigger K SV value, one that exceeds those of phosphorescent oxygen sensors. 38 , 39 It can function as a sensitive O 2 sensor and can be applied to glucose sensing in human blood ( vide infra ).…”