Self‐Assembled Fluorescent Block Copolymer Micelles with Responsive Emission

Abstract

Responsive fluorescent materials offer a high potential for sensing and (bio-)imaging applications. To investigate new concepts for such materials and to broaden their applicability, the previously reported nonfluorescent zinc(II) complex [Zn(L)] that shows coordination-induced turn-on emission was encapsulated into a family of non-fluorescent polystyrene-block-poly(4vinylpyridine) (PS-b-P4VP) diblock copolymer micelles leading to brightly emissive materials. Coordinationinduced turn-on emission upon incorporation and ligation of the [Zn(L)] in the P4VP core outperform parent [Zn(L)] in pyridine solution with respect to lifetimes, quantum yields, and temperature resistance. The quantum yield can be easily tuned by tailoring the selectivity of the employed solvent or solvent mixture and, thus, the tendency of the PS-b-P4VP diblock copolymers to self-assemble into micelles. A mediumdependent off-on sensor upon micelle formation could be established by suppression of non-micelle-borne emission background pertinent to chloroform through controlled acidification indicating an additional pHdependent process.

Metal–organic framework-derived photoelectrochemical sensors: structural design and biosensing technology

“…[123][124][125] The plasmonic-based platform is generally classified into SPR and SERS, and this sensing modality is widely applied in bioanalysis owing to the advantageous properties of molecular fingerprint information, resistance to photobleaching, low interference, and precise control over multi-component analysis. [116][117][118] The representative biosensor based on SPR or SERS, summarized in Table 2, involves strategies for enhancing the sensitivity of plasmonic nanostructures that are highly desired to facilitate progress in point-of-care testing, as well as mimicking the physiological environment.…”

Aggregation-Induced Emission-Active Nanostructures: Beyond Biomedical Applications

“…These include quantum dot light-emitting device (LED) displays in consumer electronics with better brightness and higher contrast, lower power consumption, and longer lifespan, as well as FNPs for in vivo and in vitro biosensing, bioimaging, and theranostics, some of which offer lower background, lower cytotoxicity, and higher signal-to-noise ratios . These luminescent nanomaterials may come in the form of metal nanoclusters (NCs), − nanocrystals and quantum dots, − polymer and carbon dots, − micelles and nanovesicles, , and silica nanoparticles, − etc.…”

Versatile, stable, and air-tolerant triplet–triplet annihilation upconversion block copolymer micelles

“…25 Despite these achievements toward decent air tolerance, the concentration of triplet sensitizers and emitters required by these studies is still relatively high, and the choice of solvents is very limited. 25,29,31,32…”

“…25 Despite these achievements toward decent air tolerance, the concentration of triplet sensitizers and emitters required by these studies is still relatively high, and the choice of solvents is very limited. 25,29,31,32 Meanwhile, the combinations of luminophores and polymeric materials has offered an excellent solution for such problems. [33][34][35][36] The chemical environment, density, and freedom of luminophores can be finely adjusted via the synthesis approach so that not only light intensity, but also emission colors can be arbitrarily tuned.…”