Real-time and visual sensing devices based on pH-control assembled lanthanide-barium nano-cluster

Synthesis of Two New Dinuclear Lanthanide Clusters and Visual Bifunctional Sensing Devices Based on the Eu Cluster

“…Interestingly, the fluorescence quenching intensity of 1 × 10 −8 m (1.0 ppb) acac is 15 times that of instrument noise, indicating the LOD of the probe of acac is an ultra-sensitive value of 1.0 ppb (Figure 4b), which is the most sensitive acac chemosensor, to the best of our knowledge. In this contribution, the sensing is the instrument-free visual mode, the LOD is comparable to that of the advanced metal-organic frameworks (MOFs) or coordination complex sensors for acac (0.10, [35] 1.72, [36] 0.647, [37] 0.25 ppm, [33] and also much lower than our recent work (1.65 ppm) [11] (Table 2). The LOD is the lowest value for acac among the chemosensors, to the best of our knowledge.…”

“…Nevertheless, there is rarely visual-sensitive probe device based on lanthanide complex reported. [11] In recent years, lanthanide complexes have been widely used in the field of sensing, optical imaging, magnetic resonance imaging, and biomedicine, [12] encryption, [13] and so on. [12d,14] The investigation of detection is a hot research topic because they exhibit excellent fluorescence performances, [15] such as high optical purity, large Stokes shift, characteristic sharp emission peaks, as well as long fluorescence lifetime, which come from the synergistic effect of the unique Laporte forbidden 4f electron orbital transition of lanthanide ions and organic ligand through "antenna effect."…”

“…[1a,12d] However, the luminescence of lanthanide complex is easily interfered by the surrounding environment, thereby achieving the excellent sensing behavior. [16] Up to now, lanthanide complexes-based materials have been commonly used as probes for sensing cations, [17] anions, [18] nitro explosives, [19] biomarkers, [4,20] gases, [11] small organic molecules, [21] temperature, [22] pH, [23] and so on. [24] Although bi-functional sensors have been widely reported, almost all of them are recognized in a single optical mode, and it is still a challenge to identify both analytes by multi-mode optical response.…”

“…Of course, the substrate often varied by the environment being sensed. In order to be able to conduct fluorescence detection on various substrates, the sensing solution is loaded into a user-friendly small sprayer (Figure S5, Supporting Information), [11] which is compressed into a fine mist and sprayed on different substrates with the help of compressed air as carrier gas. These substrates include plastic tube, glass, coin, test paper, stone, leaf, carbon rod, iron sheet.…”

Application of Traditional Graphic Elements Based on Fiber Bragg Grating Tactile Sensor Technology

“…As we all know, the success rate of retinal minimally invasive surgery is very high. It is incredible that the application of sensor technology is added to the probe used in the operation, which is also the key to greatly improve the success rate of surgery [23]. According to relevant data, the research team spent five years studying this technology.…”