scholarly journals Excitation induced asymmetric fluorescence emission in 2D-WS2 Quantum Dots

2022 ◽  
Author(s):  
Wenjing Miao ◽  
Xinwen Gai ◽  
Fengyang Zhao ◽  
Jingang Wang
Keyword(s):  
Quantum Dots ◽  
Laser Ablation ◽  
Fluorescence Emission ◽  
Pulsed Laser ◽  
Blue Emission ◽  
Pulsed Laser Ablation ◽  
Tungsten Disulfide

In this work, we synthesized 3-7 nm diameter tungsten disulfide quantum dots (WS2 QDs) by pulsed laser ablation in ethanol solvent, and observed strong, stable, excited independent blue emission. To...

scholarly journals Transforming Carbon Black into Graphene Oxide Quantum Dots by Pulsed Laser Ablation in Ethanol

2020 ◽  
Vol 58 (11) ◽  
pp. 808-814
Author(s):  
Jung-Il Lee ◽  
Jeong Ho Ryu
Keyword(s):  
Quantum Dots ◽  
Graphene Oxide ◽  
Laser Ablation ◽  
Carbon Black ◽  
Graphene Quantum Dots ◽  
Pulsed Laser ◽  
Blue Emission ◽  
Pulsed Laser Ablation ◽  
Absorption Bands ◽  
Graphene Oxide Quantum Dots

Graphene oxide quantum dots (GOQDs) are nanometer-sized graphene oxide fragments that exhibit unique properties, making them interesting candidates for a range of new applications. Carbon black, one of the commercially available carbon precursors, is produced by the thermal decomposition or incomplete combustion of organic compounds. It is commonly used as a supporting material for catalysts because of its excellent electrical conductivity, high surface area, and stability. In this paper, we report the transformation of carbon black into GOQDs in 10 min using a one-step facile approach. This transformation was achieved by pulsed laser ablation (PLA) in ethanol using the earth-abundant and low-cost carbon black as precursor. Only ethanol and carbon black were used for the transformation. The carbon clusters ablated from the carbon black were completely transformed into GOQDs with a homogeneous size distribution and heights in the range of 0.3-1.7 nm. This confirmed that the transformed GOQDs consisted of only single- or few-layered graphene quantum dots. The UV-vis spectra showed absorption bands at 215, 260, and 320 nm, which were attributed to the π→π* transition of the C=C of the sp<sup>2</sup> C bond in the sp<sup>3</sup> C matrix. A distinct blue emission peak at 450 nm was evident at an excitation wavelength of 360 nm. The broader PL emission spectra are due to the oxygen-related functional groups emitting PL between 300 and 440 nm.

Synthesis of N-doped graphene quantum dots by pulsed laser ablation with diethylenetriamine (DETA) and their photoluminescence

2017 ◽  
Vol 19 (33) ◽  
pp. 22395-22400 ◽  
Author(s):  
S. R. M. Santiago ◽  
T. N. Lin ◽  
C. H. Chang ◽  
Y. A. Wong ◽  
C. A. J. Lin ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Laser Ablation ◽  
Graphene Quantum Dots ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Doped Graphene ◽  
One Step

We report a facile, fast, and one-step approach to prepare N-doped graphene quantum dots (GQDs) using pulsed laser ablation with diethylenetriamine (DETA).

scholarly journals Controlling luminescent silicon nanoparticle emission produced by nanosecond pulsed laser ablation: role of interface defect states and crystallinity phase

RSC Advances ◽  
2016 ◽  
Vol 6 (113) ◽  
pp. 112520-112526 ◽  
Author(s):  
T. G. Ulusoy Ghobadi ◽  
A. Ghobadi ◽  
T. Okyay ◽  
K. Topalli ◽  
A. K. Okyay
Keyword(s):  
Laser Ablation ◽  
Silicon Nanoparticles ◽  
Pulsed Laser ◽  
Blue Emission ◽  
Pulsed Laser Ablation ◽  
Defect States ◽  
Nanosecond Pulsed Laser ◽  
Interface Defect ◽  
Nanoparticle Emission

In this study, we provide a systematic study on the origin of green and blue emission from luminescent silicon nanoparticles (Si-NPs) synthesized in water using a nanosecond pulsed laser ablation methodology.

Resolving the source of blue luminescence from alkyl-capped silicon nanoparticles synthesized by laser pulse ablation

2016 ◽  
Vol 4 (28) ◽  
pp. 6894-6899 ◽  
Author(s):  
Shalaka Dewan ◽  
Johanan H. Odhner ◽  
Katharine Moore Tibbetts ◽  
Sepideh Afsari ◽  
Robert J. Levis ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Laser Pulse ◽  
Silicon Nanoparticles ◽  
Pulsed Laser ◽  
Blue Emission ◽  
Pulsed Laser Ablation ◽  
Blue Luminescence ◽  
Uv Emission

Photoluminescence from alkyl-capped silicon nanoparticles (Si NPs) synthesized by pulsed laser ablation is resolved into two components: narrowband UV emission from the alkyl-capped Si NPs and broadly tuneable (350–500 nm) blue emission associated with a solvent by-product.

Femtosecond pulsed laser ablation in microfluidics for synthesis of photoluminescent ZnSe quantum dots

2017 ◽  
Vol 414 ◽  
pp. 205-211 ◽  
Author(s):  
Chao Yang ◽  
Guoying Feng ◽  
Shenyu Dai ◽  
Shutong Wang ◽  
Guang Li ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Laser Ablation ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Femtosecond Pulsed Laser

scholarly journals Tungsten disulfide nanoparticles produced by femtosecond laser ablation in water for nanophotonic applications

2021 ◽  
Vol 2015 (1) ◽  
pp. 012155
Author(s):  
G I Tselikov ◽  
A A Popov ◽  
G A Ermolaev ◽  
A V Syuy ◽  
A V Kabashin ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Pulsed Laser ◽  
Femtosecond Laser Ablation ◽  
Pulsed Laser Ablation ◽  
High Refractive Index ◽  
Deionized Water ◽  
Tungsten Disulfide ◽  
Spherical Nanoparticles ◽  
Optical Analysis ◽  
Bulk Target

Abstract We demonstrate nearly spherical nanoparticles of tungsten disulfide (WS2) produced by femtosecond pulsed laser ablation of bulk target in deionized water. Structural and optical analysis reveals that produced nanospheres preserve the crystalline structure, high refractive index and support strong excitons and Mie resonances in the spectral range 400-700 nm, resulting in enhanced photothermal response probed by Raman spectroscopy.

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