A dual K+–Na+ selective Prussian blue nanotubes sensor

A Mediator‐Free Electroenzymatic Sensing Methodology to Mitigate Ionic and Electroactive Interferents' Effects for Reliable Wearable Metabolite and Nutrient Monitoring

“…To investigate this effect, as shown in Figure b and Figure S3 (Supporting Information), cyclic voltammetry (CV) measurements were performed with the fabricated PB‐based sensors in a buffer with a physiologically relevant ionic strength (here, similar to that of sweat). Figure c indicates that with the higher K + concentration level in the buffer, the larger subsidiary cathodic peak current level (a measure of the PB‐to‐PW conversion) was observed, which can lead to the conclusion that the K + concentration level has a direct effect on the PB/PW redox reaction rate . This phenomenon is critical to the envisioned sweat sensing application, because the PB/PW redox reaction rate influences the reaction rate of H 2 O 2 reduction, and subsequently the measured current.…”

“…However, as widely reported in the context of conventional electrochemical sensors, PB‐based sensing presents fundamental shortcomings centering on confounding effects due to variation in biofluid conditions, rendering it unsuitable (at current stage) for the envisioned wearable applications that target biofluids with dynamically varying ionic strength and pH . In particular, PB‐based wearable sensor responses can be distorted by naturally occurring variation in ionic species' concentration in biofluids, because they rely on ionic species (such as potassium, K + ) for charge compensation and facilitating the intended PB‐based redox reactions (i.e., reduction to Prussian White, PW, from PB, as conceptualized in Figure a) . Furthermore, variation in biofluid pH (especially around neutral pH) can lead to the degradation of the PB framework resulting in the loss of its electrocatalytic activity .…”

Multicolor electrochromic thin films and devices based on the Prussian blue family nanoparticles

“…Iron has a relatively high abundance (5.63 Â 10 4 mg/kg in earth's crust) and is thus easier to access with a much lower cost as compared to tungsten. And this mixed-valence compound has been familiar with versatile niches in not only electrochromics but also secondary batteries [17,18], sensors [19,20], electrocatalysis [21,22], and radioelement removal [23,24]. Moreover, replacing the coordinate iron in the PB framework with other transition metals results in a distinct Prussian blue analogue (PBA) showing a different color [25].…”

A highly efficient and selective coumarin based fluorescent probe for colorimetric detection of Fe3+and fluorescence dual sensing of Zn2+and Cu2+

“…However, despite much attention of fluorescent sensors for selective and sensitive detection of both Fe 3+ and Zn 2+ , there is still a huge demand for new sensors with improved properties, low-cost, requirement of less labour and efficient sensors. As it is well known that coumarin framework exhibits various interesting photophysical properties such as large Stokes shift with visible excitation and emission wavelengths, high quantum yields, good photostability and also has wide application as fluorescent dyes [26][27][28] . Copper plays a vital part in the physiological processes of organisms, including connective tissue development and the formation of bone and blood.…”