Fast preparation of ultrafine monolayered transition-metal dichalcogenide quantum dots using electrochemical shock for explosive detection

2016 ◽  
Vol 52 (76) ◽  
pp. 11442-11445 ◽  
Author(s):  
Zhigang Chen ◽  
Zhengxu Tao ◽  
Shan Cong ◽  
Junyu Hou ◽  
Dengsong Zhang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Transition Metal ◽  
Explosive Detection ◽  
Fast Method ◽  
Transition Metal Dichalcogenide ◽  
Average Thickness ◽  
Average Size

A simple, general and fast method called “electrochemical shock” is developed to prepare monolayered transition-metal dichalcogenide (TMD) QDs with an average size of 2–4 nm and an average thickness of 0.85 ± 0.5 nm with only about 10 min of ultrasonication.

Observation of quantum-confined exciton states in monolayer WS2 quantum dots by ultrafast spectroscopy

Nanoscale ◽  
2021 ◽  
Author(s):  
Shuwen Zheng ◽  
Lei Wang ◽  
Hai-yu Wang ◽  
chenyu Xu ◽  
Yang Luo ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Transition Metal ◽  
Edge Effect ◽  
Quantum Confinement ◽  
Ultrafast Spectroscopy ◽  
Photophysical Properties ◽  
Quantum Confinement Effect ◽  
Confinement Effect ◽  
Transition Metal Dichalcogenide ◽  
Fundamental Study

Monolayer transition metal dichalcogenide quantum dots (TMDC QDs) could exhibit unique photophysical properties, because of both lateral quantum confinement effect and edge effect. However, there is little fundamental study on...

Boosted electrochemical ammonia synthesis by high-percentage metallic transition metal dichalcogenide quantum dots

Nanoscale ◽  
2020 ◽  
Vol 12 (20) ◽  
pp. 10964-10971 ◽  
Author(s):  
Jian Zhang ◽  
Chongyi Ling ◽  
Wenjie Zang ◽  
Xiaoxia Li ◽  
Shaozhuan Huang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Transition Metal ◽  
Electrochemical Method ◽  
Ammonia Synthesis ◽  
Value Added ◽  
Transition Metal Dichalcogenide ◽  
Ambient Conditions ◽  
Bosch Process

The electrochemical method can directly convert N2 into the high-value-added NH3 under ambient conditions and is considered to be a green and sustainable alternative to the traditional Haber–Bosch process.

scholarly journals Observation of charge transfer in mixed-dimensional heterostructures formed by transition metal dichalcogenide monolayers and PbS quantum dots

2019 ◽  
Vol 100 (23) ◽  
Author(s):  
Peymon Zereshki ◽  
Mohammad Mahdi Tavakoli ◽  
Pavel Valencia-Acuna ◽  
Ji-Hoon Park ◽  
Jing Kong ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Charge Transfer ◽  
Transition Metal ◽  
Transition Metal Dichalcogenide ◽  
Pbs Quantum Dots

scholarly journals Metallic phase transition metal dichalcogenide quantum dots showing different optical charge excitation and decay pathways

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Bo-Hyun Kim ◽  
Min-Ho Jang ◽  
Hyewon Yoon ◽  
Hyun Jun Kim ◽  
Yong-Hoon Cho ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Transition Metal ◽  
Photophysical Properties ◽  
Quantum Confinement Effect ◽  
Stokes Shift ◽  
Transition Metal Dichalcogenides ◽  
Metallic Phase ◽  
Excitation Wavelength ◽  
Transition Metal Dichalcogenide ◽  
Defect States

AbstractThe charge excitation and decay pathways of two-dimensional heteroatomic quantum dots (QDs) are affected by the quantum confinement effect, bandgap structure and strong exciton binding energy. Recently, semiconducting transition metal dichalcogenides (TMDs) have been intensively studied; however, the charge dynamics of metallic phase QDs (mQDs) of TMDs remain relatively unknown. Herein, we investigate the photophysical properties of TMD-mQDs of two sizes, where the TMD-mQDs show different charge excitation and decay pathways that are mainly ascribed to the defect states and valence band splitting, resulting in a large Stokes shift and two excitation bands for maximum photoluminescence (PL). Interestingly, the dominant excitation band redshifts as the size increases, and the time-resolved PL peak redshifts at an excitation wavelength of 266 nm in the smaller QDs. Additionally, the lifetime is shortened in the larger QDs. From the structural and theoretical analysis, we discuss that the charge decay pathway in the smaller QDs is predominantly affected by edge oxidation, whereas the vacancies play an important role in the larger QDs.

Transition metal dichalcogenide quantum dots: synthesis, photoluminescence and biological applications

2018 ◽  
Vol 6 (48) ◽  
pp. 8011-8036 ◽  
Author(s):  
Xuanyu Cao ◽  
Caiping Ding ◽  
Cuiling Zhang ◽  
Wei Gu ◽  
Yinghan Yan ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Transition Metal ◽  
Transition Metal Dichalcogenide ◽  
Biological Applications ◽  
Synthesis Strategy

We introduce the synthesis strategy, photoluminescence features and biological applications of TMD QDs.

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