Exciton Population Dynamics of Ethoxy-terminated Silicon Quantum Dots: Femtosecond Near-IR Transient Absorption Spectroscopic Study

2015 ◽  
Vol 44 (1) ◽  
pp. 88-90
Author(s):  
Dong Chen ◽  
Li Wang ◽  
Seiichi Sato ◽  
Hiroshi Yao ◽  
Naoto Tamai
Keyword(s):  
Quantum Dots ◽  
Population Dynamics ◽  
Spectroscopic Study ◽  
Transient Absorption ◽  
Silicon Quantum Dots ◽  
Near Ir

scholarly journals Evaluation of optically tailored fluorescent silicon quantum dots for bioimaging of the tear film

2020 ◽  
Author(s):  
Sidra Sarwat ◽  
Fiona Jane Stapleton ◽  
Mark Duncan Perry Willcox ◽  
Peter B O’Mara ◽  
Richard D Tilley ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Transient Absorption ◽  
Imaging System ◽  
Tear Film ◽  
Silicon Quantum Dots ◽  
Transmission Electron ◽  
Custom Made ◽  
Average Size

This experimental study aimed to investigate the feasibility of using silicon quantum dots doped with transition metals: scandium, copper and zinc as contrast agents for eventual application for the study of the tear film in eyes. Si-QDs were synthesized and characterized by transmission electron microscopy, photoluminescence, absorbance and transient absorption measurements. The fluorescence of Si-QDs was investigated when combined with TheraTears® (a balanced electrolyte formula for dry eye therapy). An optical imaging system composed of a modified slit lamp biomicroscope combined with a high-resolution Zyla sCMOS camera, SOLIS software, custom-made optical mounts and emission filters (460 nm, 510 nm and 530 nm) were used for in vitro imaging of Si-QDs with TheraTears®. The average size of Si-QDs was 2.65 nm. In vitro imaging of Sc-Si-QDs and Cu-Si-QDs indicated their stable and bright fluorescence with TheraTears®. Sc-Si-QDs were significantly brighter compared to Cu-Si-QDs and Zn-Si-QDs, and the Zn-Si-QDs showed a tendency to clump in TheraTears®. The fluorescence of the Si-QDs was detected down to a concentration of 0.01 µg/mL within a total volume of 5 µL. Cu-Si-QDs and Sc-Si-QDs showed brighter fluorescence than Zn-Si-QDs. However, Zn-Si-QDs and to a lesser extent, Cu-Si-QDs showed some aggregation at specific concentrations. Sc-Si-QDs are proposed as a better option for further development as an in vivo bioimaging agent to study the tear film dynamics.

Transient Absorption Spectroscopic Study on Band-Structure-Type Change in CdTe/CdS Core-Shell Quantum Dots

2011 ◽  
Vol 47 (9) ◽  
pp. 1177-1184 ◽  
Author(s):  
Lei Wang ◽  
Hai-Yu Wang ◽  
Bing-Rong Gao ◽  
Ling-Yun Pan ◽  
Ying Jiang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Band Structure ◽  
Spectroscopic Study ◽  
Transient Absorption ◽  
Structure Type ◽  
Core Shell ◽  
Type Change

Communication: Photoinduced Carbon Dioxide Binding with Surface-Functionalized Silicon Quantum Dots

2018 ◽  
Author(s):  
Oscar A. Douglas-Gallardo ◽  
Cristián Gabriel Sánchez ◽  
Esteban Vöhringer-Martinez
Keyword(s):  
Carbon Dioxide ◽  
Quantum Dots ◽  
Atmospheric Carbon Dioxide ◽  
Density Functional ◽  
Tight Binding ◽  
Carbon Dioxide Concentration ◽  
Research Area ◽  
Silicon Quantum Dots ◽  
Dependent Model ◽  
Photoinduced Charge

<div> <div> <div> <p>Nowadays, the search of efficient methods able to reduce the high atmospheric carbon dioxide concentration has turned into a very dynamic research area. Several environmental problems have been closely associated with the high atmospheric level of this greenhouse gas. Here, a novel system based on the use of surface-functionalized silicon quantum dots (sf -SiQDs) is theoretically proposed as a versatile device to bind carbon dioxide. Within this approach, carbon dioxide trapping is modulated by a photoinduced charge redistribution between the capping molecule and the silicon quantum dots (SiQDs). Chemical and electronic properties of the proposed SiQDs have been studied with Density Functional Theory (DFT) and Density Functional Tight-Binding (DFTB) approach along with a Time-Dependent model based on the DFTB (TD-DFTB) framework. To the best of our knowledge, this is the first report that proposes and explores the potential application of a versatile and friendly device based on the use of sf -SiQDs for photochemically activated carbon dioxide fixation. </p> </div> </div> </div>

Size-Dependent Photothermal Performance of Silicon Quantum Dots

2021 ◽  
Vol 125 (6) ◽  
pp. 3421-3431
Author(s):  
İrem Nur Gamze Özbilgin ◽  
Batu Ghosh ◽  
Hiroyuki Yamada ◽  
Naoto Shirahata
Keyword(s):  
Quantum Dots ◽  
Silicon Quantum Dots ◽  
Size Dependent

scholarly journals Surface‐Anisotropic Janus Silicon Quantum Dots via Masking on 2D Silicon Nanosheets

2021 ◽  
pp. 2100288
Author(s):  
Marc Julian Kloberg ◽  
Haoyang Yu ◽  
Elisabeth Groß ◽  
Felix Eckmann ◽  
Tassilo M. F. Restle ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Silicon Quantum Dots
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