scholarly journals Synthesis of efficient near-infrared-emitting CuInS2/ZnS quantum dots by inhibiting cation-exchange for bio application

RSC Advances ◽  
2017 ◽  
Vol 7 (18) ◽  
pp. 10675-10682 ◽  
Author(s):  
Yi su Kim ◽  
Yonghee Lee ◽  
Youngsun Kim ◽  
Donghyuk Kim ◽  
Hyung Seok Choi ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Temperature Dependence ◽  
Cation Exchange ◽  
Near Infrared ◽  
Shell Growth ◽  
Cationic Exchange

Near-infrared (NIR)-emitting CuInS2(CIS)/ZnS quantum dots (QDs) were synthesized, and we investigated temperature-dependence of cationic exchange during ZnS shell growth. The obtained QDs were transformed to nanocapsules for bio-application.

scholarly journals Retraction: A facile cation exchange-based aqueous synthesis of highly stable and biocompatible Ag2S quantum dots emitting in the second near-infrared biological window

2020 ◽  
Vol 49 (41) ◽  
pp. 14706-14706
Author(s):  
Andrew Shore
Keyword(s):  
Quantum Dots ◽  
Cation Exchange ◽  
Near Infrared ◽  
Aqueous Synthesis ◽  
Dalton Trans ◽  
Ag2s Quantum Dots

Retraction of ‘A facile cation exchange-based aqueous synthesis of highly stable and biocompatible Ag2S quantum dots emitting in the second near-infrared biological window’ by Rijun Gui et al., Dalton Trans., 2014, 43, 16690–16697, DOI: 10.1039/C4DT00699B.

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.

Retracted Article: A facile cation exchange-based aqueous synthesis of highly stable and biocompatible Ag2S quantum dots emitting in the second near-infrared biological window

2014 ◽  
Vol 43 (44) ◽  
pp. 16690-16697 ◽  
Author(s):  
Rijun Gui ◽  
Jie Sun ◽  
Dexiu Liu ◽  
Yanfeng Wang ◽  
Hui Jin
Keyword(s):  
Quantum Dots ◽  
Cation Exchange ◽  
Near Infrared ◽  
Aqueous Synthesis ◽  
Retracted Article ◽  
Ag2s Quantum Dots

We reported a facile cation-exchange-based aqueous synthesis of Ag2S quantum dots emitting in the second near-infrared biological window.

Preparation of near‐infrared Ag 2 S quantum dots for detection of bisphenol A in water

2018 ◽  
Vol 13 (1) ◽  
pp. 112-116 ◽  
Author(s):  
Yanling Hu ◽  
Chun Deng ◽  
Yu He ◽  
Yili Ge ◽  
Gongwu Song
Keyword(s):  
Quantum Dots ◽  
Bisphenol A ◽  
Near Infrared

Electrically Driven Near-Infrared Broadband Light Source with Gaussian-Like Spectral Shape Based on Multiple InAs Quantum Dots

2016 ◽  
Vol E99.C (3) ◽  
pp. 381-384 ◽  
Author(s):  
Takuma YASUDA ◽  
Nobuhiko OZAKI ◽  
Hiroshi SHIBATA ◽  
Shunsuke OHKOUCHI ◽  
Naoki IKEDA ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Light Source ◽  
Near Infrared ◽  
Spectral Shape ◽  
Inas Quantum Dots ◽  
Broadband Light Source
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