scholarly journals Fluorescent and Mechanical Properties of Silicon Quantum Dots Modified Sodium Alginate-Carboxymethylcellulose Sodium Nanocomposite Bio-Polymer Films

Polymers ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 1476 ◽  
Author(s):  
Ji ◽  
Zhang ◽  
Zhang ◽  
Quan ◽  
Huang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Sodium Alginate ◽  
Polymer Films ◽  
Composite Films ◽  
Excitation Wavelength ◽  
Hydrothermal Route ◽  
Silicon Quantum Dots ◽  
One Pot ◽  
Bright Blue Fluorescence ◽  
Bright Blue

Highly luminescent silicon quantum dots (SiQDs) were prepared via one-pot hydrothermal route. Furthermore, the optimal synthetic conditions, dependence of the emission spectrum on the excitation wavelength and fluorescent stability of SiQDs were investigated by fluorescence spectroscopy. SiQDs exhibited bright blue fluorescence, and photoluminescence (PL) lifetime is 10.8 ns when excited at 325 nm. The small-sized SiQDs (~3.3 nm) possessed uniform particle size, crystal lattice spacing of 0.31 nm and silicon (111), (220) crystal planes. Luminescent SiQDs/sodium alginate (SA)-carboxymethylcellulose sodium (CMC) nanocomposite bio-polymer films were successfully fabricated by incorporating SiQDs into the SA-CMC matrix. Meanwhile, SiQDs not only impart strong fluorescence to the polymer, but also make the composite films have favorable toughness.

One-Pot Microwave Synthesis of Water-Dispersible, Ultraphoto- and pH-Stable, and Highly Fluorescent Silicon Quantum Dots

2011 ◽  
Vol 133 (36) ◽  
pp. 14192-14195 ◽  
Author(s):  
Yao He ◽  
Yiling Zhong ◽  
Fei Peng ◽  
Xinpan Wei ◽  
Yuanyuan Su ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Microwave Synthesis ◽  
Silicon Quantum Dots ◽  
One Pot ◽  
Water Dispersible

The preparation of high-quality water-soluble silicon quantum dots and their application in the detection of formaldehyde

RSC Advances ◽  
2016 ◽  
Vol 6 (101) ◽  
pp. 98899-98907 ◽  
Author(s):  
Xiaoling Xu ◽  
Shiyao Ma ◽  
Xincai Xiao ◽  
Yan Hu ◽  
Dan Zhao
Keyword(s):  
Quantum Dots ◽  
Sodium Citrate ◽  
Water Soluble ◽  
Hydrothermal Route ◽  
High Quality ◽  
Silicon Quantum Dots ◽  
Quality Water ◽  
Soluble Silicon

This paper reports the synthesis of water-soluble fluorescence silicon quantum dots (Si QDs) through a hydrothermal route with urea propyl triethoxysilane (UPTES) as the source of silicon and sodium citrate as the deoxidizer.

scholarly journals A ratiometric fluorescent probe for pH detection based on Ag 2 S quantum dots–carbon dots nanohybrids

2020 ◽  
Vol 7 (7) ◽  
pp. 200482
Author(s):  
Xiaoxue Lei ◽  
Yiying Fu ◽  
Yuan Wu ◽  
Lu Chen ◽  
Jiangong Liang
Keyword(s):  
Quantum Dots ◽  
Carbon Dots ◽  
Ph Monitoring ◽  
Excitation Wavelength ◽  
Ph Sensing ◽  
Internal Reference ◽  
One Pot ◽  
Dual Emission ◽  
Ph Variation ◽  
Green Fluorescent

In this study, a novel ratiometric fluorescent nanoprobe for pH monitoring has been developed by synthesizing red fluorescent Ag 2 S quantum dots (Ag 2 S QDs) and green fluorescent carbon dots (CDs) nanohybrids (Ag 2 S CDs) in one pot using CDs as templates. The nanoprobe exhibits dual-emission peaks at 500 and 670 nm under a single-excitation wavelength of 450 nm. The red fluorescence can be selectively quenched by increasing pH, while the green fluorescence is an internal reference. Therefore, the change of the relative fluorescence intensity (I 500 /I 670 ) in the ratiometric Ag 2 S CDs probes can be used for pH sensing. The results revealed that I 500 /I 670 of Ag 2 S CDs probes was linearly related to pH variation between pH 5.4 and 6.8. Meanwhile, the Ag 2 S CDs probes possessed a good reversibility along with pH changing between 5.0 and 7.0 without any interruption from common metal ions, proteins and other interferences.

Direct synthesis of carbon quantum dots in aqueous polymer solution: one-pot reaction and preparation of transparent UV-blocking films

2017 ◽  
Vol 5 (10) ◽  
pp. 5187-5194 ◽  
Author(s):  
Samuel C. Hess ◽  
Fitri A. Permatasari ◽  
Hiromitsu Fukazawa ◽  
Elia M. Schneider ◽  
Ratna Balgis ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Elevated Temperature ◽  
Polymer Solution ◽  
Uv Light ◽  
Direct Synthesis ◽  
Composite Films ◽  
Carbon Quantum Dots ◽  
One Pot ◽  
Aqueous Polymer ◽  
Aqueous Polymer Solution

Synthesized transparent CQD–PVA composite films performed stable UV-A blocking, even after exposure to UV light for several days and elevated temperature.

Thermal luminescence quenching of amine-functionalized silicon quantum dots: a pH and wavelength-dependent study

2015 ◽  
Vol 17 (37) ◽  
pp. 24078-24085 ◽  
Author(s):  
Surajit Chatterjee ◽  
Tushar Kanti Mukherjee
Keyword(s):  
Quantum Dots ◽  
Luminescence Quenching ◽  
Excitation Wavelength ◽  
Silicon Quantum Dots ◽  
Influence Of Temperature ◽  
Amine Functionalized ◽  
Influence Of Temperature On ◽  
Amine Groups

The influence of temperature on the PL properties of silicon quantum dots (Si QDs) as a function of pH and excitation wavelength has been investigated to understand the role of surface amine groups and the bandgap of allylamine-capped Si QDs.

scholarly journals One-pot synthesis of colloidal silicon quantum dots and surface functionalization via thiol–ene click chemistry

2012 ◽  
Vol 48 (97) ◽  
pp. 11874 ◽  
Author(s):  
Xiaoyu Cheng ◽  
Richard Gondosiswanto ◽  
Simone Ciampi ◽  
Peter J. Reece ◽  
J. Justin Gooding
Keyword(s):  
Quantum Dots ◽  
Click Chemistry ◽  
Surface Functionalization ◽  
Silicon Quantum Dots ◽  
One Pot ◽  
One Pot Synthesis

Anatase TiO2 nanosheets with exposed highly reactive (001) facets as an efficient photoanode for quantum dot-sensitized solar cells

RSC Advances ◽  
2016 ◽  
Vol 6 (72) ◽  
pp. 67968-67975 ◽  
Author(s):  
Haitao Zhou ◽  
Lin Li ◽  
Dianli Jiang ◽  
Yingbing Lu ◽  
Kai Pan
Keyword(s):  
Quantum Dots ◽  
Solar Cell ◽  
Anatase Tio2 ◽  
Cdse Quantum Dots ◽  
Two Dimensional ◽  
Hydrothermal Route ◽  
One Pot ◽  
Tio2 Nanosheets ◽  
High Efficient ◽  
Sensitized Solar Cells

Two-dimensional (2D) anatase TiO2 nanosheets (TiO2-NSs) with exposed (001) crystal planes were obtained via a simple one-pot hydrothermal route, and a high efficient CdSe quantum dots solar cell was obtained based on the TiO2 nanosheets photoanode.

scholarly journals Enhanced Raman and luminescence spectra from co-encapsulated silicon quantum dots and Au–Ag nanoalloys

2014 ◽  
Vol 50 (82) ◽  
pp. 12389-12391 ◽  
Author(s):  
Noor Aniza Harun ◽  
Benjamin R. Horrocks ◽  
David A. Fulton
Keyword(s):  
Quantum Dots ◽  
Polymeric Nanoparticles ◽  
Luminescence Spectra ◽  
Excitation Wavelength ◽  
Alloy Nanoparticles ◽  
Silicon Quantum Dots

Luminescence and SERS signals are simultaneously enhanced with a single excitation wavelength by co-encapsulating silicon quantum dots and Au–Ag alloy nanoparticles encoded with Raman reporter molecules inside polymeric nanoparticles.

Low‐Cost Water Soluble Silicon Quantum Dots and Biocompatible Fluorescent Composite Films

2021 ◽  
pp. 2100173
Author(s):  
Guitao Du ◽  
Guoqian Li ◽  
Shibo Qiu ◽  
Linghong Liu ◽  
Yuewei Zheng ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Low Cost ◽  
Composite Films ◽  
Water Soluble ◽  
Silicon Quantum Dots ◽  
Soluble Silicon
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