Precise size separation of water-soluble red-to-near-infrared-luminescent silicon quantum dots by gel electrophoresis

Nanoscale ◽  
2020 ◽  
Vol 12 (16) ◽  
pp. 9266-9271
Author(s):  
Minoru Fujii ◽  
Akiko Minami ◽  
Hiroshi Sugimoto
Keyword(s):  
Quantum Dots ◽  
Standard Method ◽  
Gel Electrophoresis ◽  
Near Infrared ◽  
Water Soluble ◽  
Silicon Quantum Dots ◽  
Size Separation ◽  
First Time ◽  
Si Quantum Dots

Gel electrophoresis, which is a standard method for separation and analysis of macromolecules such as DNA, RNA and proteins, is applied for the first time to silicon (Si) quantum dots (QDs) for size separation.

scholarly journals Bacterial Synthesis of Ternary CdSAg Quantum Dots through Cation Exchange: Tuning the Composition and Properties of Biological Nanoparticles for Bioimaging and Photovoltaic Applications

2020 ◽  
Vol 8 (5) ◽  
pp. 631 ◽  
Author(s):  
Nicolás Órdenes-Aenishanslins ◽  
Giovanna Anziani-Ostuni ◽  
Juan Pablo Monrás ◽  
Alejandra Tello ◽  
Denisse Bravo ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Cation Exchange ◽  
Near Infrared ◽  
Fluorescent Dyes ◽  
Exchange Process ◽  
Water Soluble ◽  
Partial Replacement ◽  
Biological Synthesis ◽  
Bacterial Cells ◽  
First Time

In this study, we introduce a biological method for the production of ternary Quantum Dots (QDs): complex nanostructures with tunable optical and structural properties that utilizes post-synthesis modifications through cation exchange. This versatile in-situ cation exchange method being reported for the first time shows great potential for extending the scope of microbial synthesis. By using this bacterial-based method, we easily synthesize and purify CdS, CdSAg, and Ag2S nanocrystals of a size below 15 nm and with variable morphologies that exhibit fluorescence emissions covering a broad spectral range (from 400 to 800 nm). Energy-dispersive X-ray spectroscopy (EDS) results indicate the partial replacement of Cd2+ by Ag+ when AgNO3 concentration is increased. This replacement produces CdSAg ternary QDs hetero-structures with high stability, fluorescence in the NIR-I (700 - 800 nm), and 36.13% quantum yield. Furthermore, this reaction can be extended for the production of soluble Ag2S nanoparticles (NPs) without any traces of Cd. QDs biosynthesized through this cation exchange process display very low toxicity when tested in bacterial or human cell lines. Biosynthesized ternary hetero-structures were used as red fluorescent dyes to label HeLa cells in confocal microscopy studies, which validates its use in bioimaging applications in the near infrared region. In addition, the application of biologically-produced cadmium NPs in solar cells is reported for the first time. The three biosynthesized QDs were successfully used as photosensitizers, where the CdSAg QDs show the best photovoltaic parameters. Altogether, obtained results validate the use of bacterial cells for the controlled production of nanomaterials with properties that allow their application in diverse technologies. We developed a simple biological process for obtaining tunable Quantum Dots (QDs) with different metal compositions through a cation exchange process. Nanoparticles (NPs) are produced in the extracellular space of bacterial cells exposed to cysteine and CdCl2 in a reaction that depends on S2− generation mediated by cysteine desulfhydrase enzymes and uses cellular biomolecules to stabilize the nanoparticle. Using this extracellular approach, water-soluble fluorescent CdS, CdSAg, and Ag2S Quantum Dots with a tunable emission ranging from 400 to 800 nm were generated. This is the first study reporting the use of microorganisms to produce tunable ternary QDs and the first time that a cation exchange process mediated by cells is described. Obtained results validate the use of biological synthesis to produce NPs with new characteristics and opens a completely new research field related to the use of microorganisms to synthesize complex NPs that are difficult to obtain with regular chemical methods.

scholarly journals Retraction: Water-soluble multidentate polymers compactly coating Ag2S quantum dots with minimized hydrodynamic size and bright emission tunable from red to second near-infrared region

Nanoscale ◽  
2020 ◽  
Vol 12 (41) ◽  
pp. 21459-21459
Author(s):  
Charlotte Marshall
Keyword(s):  
Quantum Dots ◽  
Near Infrared ◽  
Infrared Region ◽  
Water Soluble ◽  
Hydrodynamic Size ◽  
Near Infrared Region ◽  
Ag2s Quantum Dots ◽  
Bright Emission

Retraction of ‘Water-soluble multidentate polymers compactly coating Ag2S quantum dots with minimized hydrodynamic size and bright emission tunable from red to second near-infrared region’ by Rijun Gui et al., Nanoscale, 2014, 6, 5467–5473, DOI: 10.1039/C4NR00282B.

Design and Synthesis of Highly Luminescent Near-Infrared-Emitting Water-Soluble CdTe/CdSe/ZnS Core/Shell/Shell Quantum Dots

2009 ◽  
Vol 48 (20) ◽  
pp. 9723-9731 ◽  
Author(s):  
Wenjin Zhang ◽  
Guanjiao Chen ◽  
Jian Wang ◽  
Bang-Ce Ye ◽  
Xinhua Zhong
Keyword(s):  
Quantum Dots ◽  
Near Infrared ◽  
Water Soluble ◽  
Core Shell ◽  
Design And Synthesis

Antibody-conjugated near-infrared luminescent silicon quantum dots for biosensing

2019 ◽  
Vol 9 (3) ◽  
pp. 1079-1086 ◽  
Author(s):  
Hiroto Yanagawa ◽  
Asuka Inoue ◽  
Hiroshi Sugimoto ◽  
Masahiko Shioi ◽  
Minoru Fujii
Keyword(s):  
Quantum Dots ◽  
Near Infrared ◽  
Silicon Quantum Dots ◽  
Image Position

Abstract

Near-infrared photoresponse in Ge/Si quantum dots enhanced by localized surface plasmons supported by aluminum nanodisks

2020 ◽  
Vol 128 (14) ◽  
pp. 143101
Author(s):  
A. I. Yakimov ◽  
V. V. Kirienko ◽  
A. A. Bloshkin ◽  
A. V. Dvurechenskii ◽  
D. E. Utkin
Keyword(s):  
Quantum Dots ◽  
Surface Plasmons ◽  
Near Infrared ◽  
Localized Surface Plasmons ◽  
Si Quantum Dots

Enhancement of efficiency and long-term stability in graphene/Si-quantum-dot heterojunction photodetectors by employing bis(trifluoromethanesulfonyl)-amide as a dopant for graphene

2017 ◽  
Vol 5 (48) ◽  
pp. 12737-12743 ◽  
Author(s):  
Dong Hee Shin ◽  
Chan Wook Jang ◽  
Ju Hwan Kim ◽  
Jong Min Kim ◽  
Ha Seung Lee ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Term Stability ◽  
Long Term Stability ◽  
Si Quantum Dot ◽  
First Time ◽  
Si Quantum Dots

Bis(trifluoromethanesulfonyl)-amide (TFSA) is for the first time employed as a dopant for graphene for graphene/Si-quantum-dots-based photodetectors.

Near Infrared Silicon Quantum Dots MOSFET Detector

2009 ◽  
Author(s):  
Jia-Min Shieh ◽  
Wen-Chien Yu ◽  
Chao-Kei Wang ◽  
Bau-Tong Dai ◽  
Hao-Chung Kuo ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Near Infrared ◽  
Silicon Quantum Dots ◽  
Mosfet Detector

Water-Soluble Photoluminescent Silicon Quantum Dots

2005 ◽  
Vol 44 (29) ◽  
pp. 4550-4554 ◽  
Author(s):  
Jamie H. Warner ◽  
Akiyoshi Hoshino ◽  
Kenji Yamamoto ◽  
Richard. D. Tilley
Keyword(s):  
Quantum Dots ◽  
Water Soluble ◽  
Silicon Quantum Dots

Water-Soluble Photoluminescent Silicon Quantum Dots

2005 ◽  
Vol 117 (29) ◽  
pp. 4626-4630 ◽  
Author(s):  
Jamie H. Warner ◽  
Akiyoshi Hoshino ◽  
Kenji Yamamoto ◽  
Richard. D. Tilley
Keyword(s):  
Quantum Dots ◽  
Water Soluble ◽  
Silicon Quantum Dots
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