scholarly journals A top–down strategy towards monodisperse colloidal lead sulphide quantum dots

2013 ◽  
Vol 4 (1) ◽  
Author(s):  
Jing Yang ◽  
Tao Ling ◽  
Wen-Tian Wu ◽  
Hui Liu ◽  
Min-Rui Gao ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Top Down ◽  
Lead Sulphide ◽  
Colloidal Lead

scholarly journals Top-Down N-Doped Carbon Quantum Dots for Multiple Purposes: Heavy Metal Detection and Intracellular Fluorescence

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2249
Author(s):  
Francesca Limosani ◽  
Elvira Maria Bauer ◽  
Daniele Cecchetti ◽  
Stefano Biagioni ◽  
Viviana Orlando ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Metal Ion ◽  
Reaction Times ◽  
Size Control ◽  
Carbon Quantum Dots ◽  
Cell Nuclei ◽  
Top Down ◽  
Hek 293 ◽  
Metal Ion Detection ◽  
Intracellular Fluorescence

In the present study, we successfully synthesized N-doped carbon quantum dots (N-CQDs) using a top-down approach, i.e., hydroxyl radical opening of fullerene with hydrogen peroxide, in basic ambient using ammonia for two different reaction times. The ensuing characterization via dynamic light scattering, SEM, and IR spectroscopy revealed a size control that was dependent on the reaction time, as well as a more pronounced -NH2 functionalization. The N-CQDs were probed for metal ion detection in aqueous solutions and during bioimaging and displayed a Cr3+ and Cu2+ selectivity shift at a higher degree of -NH2 functionalization, as well as HEK-293 cell nuclei marking.

Single photon emission from top-down etched III-nitride quantum dots

2020 ◽  
Vol 31 (13) ◽  
pp. 13LT01 ◽  
Author(s):  
Yaonan Hou ◽  
Yong Wang ◽  
Qingkang Ai
Keyword(s):  
Quantum Dots ◽  
Single Photon ◽  
Photon Emission ◽  
Single Photon Emission ◽  
Top Down

(Invited) In Vitro and In Vivo Near-Infrared Imaging with Biocompatible Bottom-up and Top-Down-Synthesized Graphene Quantum Dots

2020 ◽  
Vol MA2020-01 (6) ◽  
pp. 648-648
Author(s):  
Anton V Naumov ◽  
Md Tanvir Hasan ◽  
Elizabeth Campbell ◽  
Ching-Wei Lin ◽  
Angela M. Belcher
Keyword(s):  
Quantum Dots ◽  
Near Infrared ◽  
Infrared Imaging ◽  
Graphene Quantum Dots ◽  
Top Down ◽  
Near Infrared Imaging ◽  
Bottom Up

scholarly journals Quantum Confinement Effect and Photoenhancement of Photoluminescence of PbS and PbS/MnS Quantum Dots

2020 ◽  
Vol 10 (18) ◽  
pp. 6282
Author(s):  
Muhammad Safwan Zaini ◽  
Josephine Ying Chyi Liew ◽  
Shahrul Ainliah Alang Ahmad ◽  
Abdul Rahman Mohmad ◽  
Mazliana Ahmad Kamarudin
Keyword(s):  
Aqueous Solution ◽  
Quantum Dots ◽  
Quantum Confinement ◽  
Shell Thickness ◽  
Quantum Confinement Effect ◽  
Band Gap Energy ◽  
Confinement Effect ◽  
Core Shell ◽  
Lead Sulphide ◽  
Peak Energy

The quantum confinement effect and photoenhancement of photoluminescence (PL) of lead sulphide (PbS) quantum dots (QDs) and lead sulphide/manganese sulphide (PbS/MnS) core shell QDs capped with thiol ligands in aqueous solution were investigated. From PL results, the presence of MnS shells gives a strong confinement effect which translates to higher emission energy in PbS/MnS core shell QDs. Increasing MnS shell thickness from 0.3 to 1.5 monolayers (ML) causes a blueshift of PL peak energies as the charge carriers concentrated in the PbS core region. Enhancement of the PL intensity of colloidal PbS and PbS/MnS core shell QDs has been observed when the samples are illuminated above the band gap energy, under continuous irradiation for 40 min. Luminescence from PbS QDs and PbS/MnS core shell QDs can be strongly influenced by the interaction of water molecules and oxygen present in aqueous solution adsorbed on the QD surface. However, PbS/MnS core shell QDs with a shell thickness of 1.5 ML did not show a PL peak energy stability as it was redshifted after 25 min, probably due to wider size distribution of the QDs.

On the determination of absorption cross section of colloidal lead halide perovskite quantum dots

2019 ◽  
Vol 151 (15) ◽  
pp. 154706 ◽  
Author(s):  
Joseph Puthenpurayil ◽  
Oscar Hsu-Cheng Cheng ◽  
Tian Qiao ◽  
Daniel Rossi ◽  
Dong Hee Son
Keyword(s):  
Quantum Dots ◽  
Cross Section ◽  
Absorption Cross Section ◽  
Absorption Cross ◽  
Perovskite Quantum Dots ◽  
Halide Perovskite ◽  
Colloidal Lead ◽  
Lead Halide

Reply to Comment on ‘Unconventional gap state of trapped exciton in lead sulphide quantum dots’

2011 ◽  
Vol 22 (23) ◽  
pp. 238002 ◽  
Author(s):  
J E Lewis ◽  
S Wu ◽  
Xiaomei Jiang
Keyword(s):  
Quantum Dots ◽  
Lead Sulphide ◽  
Gap State

Synthesis of Fluorinated and Nonfluorinated Graphene Quantum Dots through a New Top-Down Strategy for Long-Time Cellular Imaging

2015 ◽  
Vol 21 (9) ◽  
pp. 3791-3797 ◽  
Author(s):  
Hanjun Sun ◽  
Haiwei Ji ◽  
Enguo Ju ◽  
Yijia Guan ◽  
Jinsong Ren ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Graphene Quantum Dots ◽  
Cellular Imaging ◽  
Top Down ◽  
Long Time

Recent progress in g-C3N4 quantum dots: synthesis, properties and applications in photocatalytic degradation of organic pollutants

2020 ◽  
Vol 8 (2) ◽  
pp. 485-502 ◽  
Author(s):  
Teng Wang ◽  
Chunyang Nie ◽  
Zhimin Ao ◽  
Shaobin Wang ◽  
Taicheng An
Keyword(s):  
Quantum Dots ◽  
Photocatalytic Degradation ◽  
Organic Pollutants ◽  
Recent Progress ◽  
Top Down ◽  
Bottom Up ◽  
Synthesis Properties ◽  
Catalytic Removal

Graphitic-C3N4 quantum dots (g-C3N4QDs), which can be prepared by top-down and bottom-up synthesis, exhibit excellent optical features. They can act as different roles during the photo(electro)catalytic removal of organic pollutants.

scholarly journals Dielectric function of colloidal lead chalcogenide quantum dots obtained by a Kramers-Krönig analysis of the absorbance spectrum

2010 ◽  
Vol 81 (23) ◽  
Author(s):  
Iwan Moreels ◽  
Guy Allan ◽  
Bram De Geyter ◽  
Ludger Wirtz ◽  
Christophe Delerue ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Dielectric Function ◽  
Lead Chalcogenide ◽  
Absorbance Spectrum ◽  
Colloidal Lead
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