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Principles Of Fluorescence Spectroscopy

Carbon dots: synthesis, formation mechanism, fluorescence origin and sensing applications

The design and synthesis of double network (DN) hydrogels that can mimic the properties and/or structure of natural tissue has flourished in recent years, overcoming the bottlenecks of mechanical performance of single network hydrogels and extending their potential applications in various fields. In recent years, such bioinspired DN hydrogels with extraordinary mechanical performance, excellent biocompatibility, and considerable strength have been demonstrated to be promising candidates for biomedical applications, such as tissue engineering and biomedicine. In this minireview, we provide an overview of the recent developments of bioinspired DN hydrogels defined as DN hydrogels that mimic the properties and/or structure of natural tissue, ranging from, e.g., anisotropically structured DN hydrogels, via ultratough energy dissipating DN hydrogels to dynamic, reshapable DN hydrogels. Furthermore, we discuss future perspectives of bioinspired DN hydrogels for biomedical applications.

Bioinspired double network hydrogels: from covalent double network hydrogels via hybrid double network hydrogels to physical double network hydrogels

Carbon dots (CDs) are relatively new and one of the most propitious nanomaterials ever known to humanity, primarily consisting of a carbonized carbon core with heteroatoms in organic functional groups attached. CDs show various fascinating properties, such as tunable excitation/emission, chemical inertness, photostability, low toxicity, good biocompatibility, ease of handling, and eco-friendliness. Due to the anomalous optical and chemical properties of the CDs, they have a wide range of applications in the fields of bioimaging, biosensing, photocatalysis, optoelectronics, etc. In this Review, we intend to cover the many strides in CDs chemistry, which is an emerging paradigm, in conjunction with the most recent discoveries of CDs with near-infrared fluorescence, phosphorescence, electroluminescence, chirality, and antibacterial activity. Our main emphasis will be on the contemporary evolution in synthetic strategies, optical properties, and biomedical applications of CDs in nanomedicine and nanotheranostics.

Recent Advances in Synthesis, Optical Properties, and Biomedical Applications of Carbon Dots

Enhancing Biopolymer Hydrogel Functionality through Interpenetrating Networks.

Oxygen vacancy (OV) engineering in semiconductors can greatly enhance the separation of photo-induced electron-hole pairs, thereby enhancing the photocatalytic activity. Taking inspiration from this, we prepared a novel BiOBr-H/Rub2d composite by functionalizing OV-rich BiOBr (named BiOBr-H) with a carboxyl functionalized ruthenium photosensitizer (Ru(bpy)2C-pyCl2, abbreviated as Rub2d), which was then successfully applied for photodynamic therapy (PDT). Density functional theory (DFT) calculations confirmed efficient electron transfer from the Rub2d complex to the intermediate energy level of BiOBr-H under visible light irradiation. In vitro and in vivo studies demonstrated that BiOBr-H/Rub2d was a superior agent for photodynamic therapy compared with the free ruthenium complex. The theoretical and experimental data presented thus reveal for the first time that abundant OVs in BiOBr-H can significantly improve the photocatalytic activity of a photosensitizer, resulting in the generation of more reactive oxygen species to enhance PDT. The findings of this study thus offer a new strategy for the development of highly efficient cancer therapies.

https://pubs.rsc.org/en/content/articlepdf/2019/sc/c8sc05275a

Vacancy-enhanced generation of singlet oxygen for photodynamic therapy

Carbon dots and ruthenium doped oxygen sensitive nanofibrous membranes for monitoring the respiration of agricultural products

In this work, we synthesized a hypoxia responsive upconversion nanosensor by the conjugation of oxygen insensitive upconversion carbon dots (CDs) with an oxygen sensitive ruthenium(ii) complex (Rud2b). The CD-Rud2b conjugate was then PEGylated to mediate the formation of nano-sized assemblies of the resultant polymer probe (CD-Ru-mPEG) in aqueous solution. The strategy allows the oxygen sensitive probe (Rud2b) to be excited by NIR irradiation and achieve upconverted emission through the Forster resonance energy transfer process from the CDs. The oxygen sensitivity of the ruthenium moiety was well-preserved in the polymeric aggregates because the PEG chains could prohibit the occurrence of self-quenching that may occur due to the close packing of the probes. Such an upconversion photoluminescence property makes the CD-Ru-mPEG nanosensor work as a biocompatible imaging system to monitor the oxygen level in cells and the hypoxic condition in vivo.

Construction of a hypoxia responsive upconversion nanosensor for tumor imaging by fluorescence resonance energy transfer from carbon dots to ruthenium complex.

In this work, a novel ruthenium complex loaded monolayer layered double hydroxide (LDH) (denoted as Ru(C-bpy)2 /mLDH) as supramolecular nanosensor is synthesized, which is greatly exclusive to the hypoxic tumor microenvironment. The Ru(C-bpy)2 /mLDH ultrathin sheet displays not only enhanced luminescence lifetime compared to the parent Ru(C-bpy)2 alone, but also improved oxygen responsibility under an excitation of 488 or 800 nm. Moreover, the Ru(C-bpy)2 /mLDH is possessed of two-photon fluorescence imaging ability under the 800 nm irradiation. In addition, the Ru(C-bpy)2 /mLDH can generate singlet oxygen with a high yield (φ∆ ) of 0.28 under the 520 nm irradiation, while the φ∆ of Ru(C-bpy)2 is 0.19. Therefore, the Ru(C-bpy)2 /mLDH can be applied as a supramolecular theranostic agent with light-switchable cancer imaging and photodynamic therapy properties.

Excitation-Dependent Theranostic Nanosheet for Cancer Treatment.

Highly sensitive AIE-based mechanoresponsive luminescent polymer coatings for surface pressure imaging

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