Ge1−xSnx alloy quantum dots with composition-tunable energy gaps and near-infrared photoluminescence

Nanoscale ◽  
2018 ◽  
Vol 10 (43) ◽  
pp. 20296-20305 ◽  
Author(s):  
Venkatesham Tallapally ◽  
Tanner A. Nakagawara ◽  
Denis O. Demchenko ◽  
Ümit Özgür ◽  
Indika U. Arachchige
Keyword(s):  
Quantum Dots ◽  
Infrared Absorption ◽  
Near Infrared ◽  
Colloidal Synthesis ◽  
Energy Gaps ◽  
Alloy Quantum Dots

Colloidal synthesis and photophysical characterization of silicon-compatible Ge1−xSnx alloy quantum dots with composition-tunable near-infrared absorption and photoluminescence is reported.

Facile Synthesis and Characterization of CdSe/ZnSe Core/Shell and ZnxCd1−xSe Alloy Quantum Dots via Non-organometallic Route

2018 ◽  
Vol 30 (1) ◽  
pp. 161-169 ◽  
Author(s):  
Oluwatobi Samuel Oluwafemi ◽  
Vuyelwa Ncapayi ◽  
Sundararajan Parani ◽  
Ncediwe Tsolekile
Keyword(s):  
Quantum Dots ◽  
Synthesis And Characterization ◽  
Core Shell ◽  
Facile Synthesis ◽  
Alloy Quantum Dots

scholarly journals Fluorine-Doped Tin Oxide Colloidal Nanocrystals

Nanomaterials ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 863 ◽  
Author(s):  
Owen Kendall ◽  
Pierce Wainer ◽  
Steven Barrow ◽  
Joel van Embden ◽  
Enrico Della Gaspera
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Tin Oxide ◽  
Near Infrared ◽  
Transparent Electrode ◽  
High Quality ◽  
Detailed Characterization

Fluorine-doped tin oxide (FTO) is one of the most studied and established materials for transparent electrode applications. However, the syntheses for FTO nanocrystals are currently very limited, especially for stable and well-dispersed colloids. Here, we present the synthesis and detailed characterization of FTO nanocrystals using a colloidal heat-up reaction. High-quality SnO2 quantum dots are synthesized with a tuneable fluorine amount up to ~10% atomic, and their structural, morphological and optical properties are fully characterized. These colloids show composition-dependent optical properties, including the rise of a dopant-induced surface plasmon resonance in the near infrared.

scholarly journals Organic Alternatives to Quantum Dots for Intraoperative Near-Infrared Fluorescent Sentinel Lymph Node Mapping

2005 ◽  
Vol 4 (3) ◽  
pp. 153535002005051 ◽  
Author(s):  
Shunsuke Ohnishi ◽  
Stephen J. Lomnes ◽  
Rita G. Laurence ◽  
Andrew Gogbashian ◽  
Giuliano Mariani ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Lymph Node ◽  
Sentinel Lymph Node ◽  
Contrast Agents ◽  
Clinical Studies ◽  
Near Infrared ◽  
Sentinel Lymph Node Mapping ◽  
Lymph Node Mapping ◽  
Advantages And Disadvantages

Intraoperative near-infrared (NIR) fluorescence imaging provides the surgeon with real-time image guidance during cancer and other surgeries. We have previously reported the use of NIR fluorescent quantum dots (QDs) for sentinel lymph node (SLN) mapping. However, because of concerns over potential toxicity, organic alternatives to QDs will be required for initial clinical studies. We describe a family of 800 nm organic heptamethine indocyanine-based contrast agents for SLN mapping spanning a spectrum from 775 Da small molecules to 7 MDa nanocolloids. We provide a detailed characterization of the optical and physical properties of these contrast agents and discuss the advantages and disadvantages of each. We present robust methods for the covalent conjugation, purification, and characterization of proteins with tetra-sulfonated heptamethine indocyanines, including mass spectroscopic site mapping of highly substituted molecules. One contrast agent, NIR fluorescent human serum albumin (HSA800), emerged as the molecule with the best overall performance with respect to entry to lymphatics, flow to the SLN, retention in the SLN, fluorescence yield and reproducibility. This preclinical study, performed on large animals approaching the size of humans, should serve as a foundation for future clinical studies.

Synthesis and Characterization of Near-Infrared Cu−In−Se/ZnS Core/Shell Quantum Dots for In vivo Imaging

2010 ◽  
Vol 22 (22) ◽  
pp. 6117-6124 ◽  
Author(s):  
E. Cassette ◽  
T. Pons ◽  
C. Bouet ◽  
M. Helle ◽  
L. Bezdetnaya ◽  
...  
Keyword(s):  
Quantum Dots ◽  
In Vivo Imaging ◽  
Near Infrared ◽  
Synthesis And Characterization ◽  
Core Shell

scholarly journals Preparation and Characterization of Highly Fluorescent, Glutathione-coated Near Infrared Quantum Dots for in Vivo Fluorescence Imaging

2008 ◽  
Vol 9 (10) ◽  
pp. 2044-2061 ◽  
Author(s):  
Takashi Jin ◽  
Fumihiko Fujii ◽  
Yutaka Komai ◽  
Junji Seki ◽  
Akitoshi Seiyama ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Fluorescence Imaging ◽  
Near Infrared ◽  
In Vivo Fluorescence ◽  
In Vivo Fluorescence Imaging
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