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Plastic waste was transformed into high-performance quantum dots (QDs), combining technological innovation with a focus on environmental sustainability. The excellent fluorescence properties of the synthesized quantum dots were utilized to detect Fe and F ions with high sensitivity and selectivity in an "on-off-on" dual-mode fashion. Additionally, the synthesized quantum dots exhibited stable solid-state fluorescence, enabling their use in solid-phase applications without the typical fluorescence loss observed in other materials. The versatility and tunability of the synthesized materials were demonstrated by producing three different emission colors, achieved through the incorporation of various heteroatoms during the synthesis process. This solid-state fluorescent material provides a pathway for sensing and optoelectronic applications, as well as advanced optical devices with customizable designs in the future.
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http://dx.doi.org/10.1039/d5ra02014j | DOI Listing |
Phys Chem Chem Phys
September 2025
Department of Chemistry, Graduate School of Science and Technology, Kwansei Gakuin University, 1 Gakuen Uegahara, Sanda, Hyogo 669-1330, Japan.
Hybrid systems (HSs) of quantum dots (QDs) and molecular photoswitches exhibit luminescence switching of QDs based on energy transfer and have garnered attention for their potential applications in sensors and optical memories. In HSs, the chemical composition, such as the number of attached ligands, is inherently distributed, posing challenges for extracting the energy transfer process from the QDs to a single acceptor molecule. The stochastic model, assuming a Poisson distribution for the number of acceptors, proves to be an effective approach for extracting the process.
View Article and Find Full Text PDFMikrochim Acta
September 2025
Faculty of Life Science and Technology, Kunming University of Science and Technology, Yunnan Province, 650500, China.
Iron-cerium co-doped carbon dots (Fe,Ce-CDs) were synthesized by one-step hydrothermal method using tartaric acid and L-tryptophan as ligands. Fe,Ce-CDs shows excellent peroxidase-like (POD) activity and nitrite (NO) can promote the oxidation of 3,3',5,5'-tetramethylbenzidine (TMB) to its blue oxidation product (oxTMB) due to the formation of ∙NO free radical. NO further react with oxTMB to form a yellow color via diazotization resulting in the absorbance Change at 450 nm.
View Article and Find Full Text PDFAnal Chem
September 2025
School of Agricultural Engineering, Key Laboratory of Modern Agricultural Equipment and Technology (Ministry of Education), Jiangsu University, Zhenjiang, Jiangsu 212013, PR China.
To balance the "detection sensitivity" and "device stability" of the organic photoelectrochemical transistor (OPECT) aptasensors, it has become an urgent challenge for achieving effective signal modulation under low ascorbic acid (AA) conditions. To address this, our work proposed a collaborative optimization strategy by coupling heterojunction engineering with interfacial molecular modulation, to endow a high current gain of OPECT with low-AA -dependence. First, a CdZnS-SnInS heterojunction gate was constructed by in situ growth of CdZnS quantum dots (QDs) on SnInS nanoflowers, which enhanced the light trapping ability and photoelectric conversion efficiency of the photoactive gate.
View Article and Find Full Text PDFInt J Biol Macromol
September 2025
School of Life Science and Technology, Wuhan Polytechnic University, Wuhan, 430023, China. Electronic address:
Quantum dots, with their superior intrinsic fluorescence and photostability, are emerging as a promising option for cancer gene therapy, diagnosis, and imaging. However, low gene delivery efficiency, insufficient targeting, and responsiveness remain challenges. To address these issues, PEI-based carbon quantum dots (CPNCs) were constructed by crosslinking polyethylenimine quantum dots (PQDs) with carbon quantum dots (CQDs) via disulfide bonds.
View Article and Find Full Text PDFBiochem Biophys Res Commun
August 2025
Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, MA, 02139, USA. Electronic address:
Superparamagnetic iron oxide nanoparticles (SPIONs) have emerged as powerful tools in nanomedicine owing to their heavy-metal-free composition, distinct magnetic properties, biocompatibility, and customizable surface chemistry. While traditionally employed as T-weighted MRI contrast agents, recent innovations have enabled the development of ultra-small SPIONs-such as exceedingly small SPIONs (ES-SPIONs) and single-nanometer iron oxide nanoparticles (SNIOs)-that offer T-weighted MRI capabilities, which are favored by radiologists for their superior anatomical clarity. This review highlights the synthesis of monodisperse SPIONs via thermal decomposition and controlled oxidation, as well as their functionalization with zwitterionic dopamine sulfonate (ZDS) ligands, which confer colloidal stability, minimal protein adsorption, and efficient renal clearance.
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