Probing the Interaction of Single Nanocrystals with Inorganic Capping Ligands: Time-Resolved Fluorescence from CdSe–CdS Quantum Dots Capped with Chalcogenidometalates

2012 ◽  
Vol 134 (44) ◽  
pp. 18366-18373 ◽  
Author(s):  
Amy A. Cordones ◽  
Marcus Scheele ◽  
A. Paul Alivisatos ◽  
Stephen R. Leone
Keyword(s):  
Quantum Dots ◽  
Cds Quantum Dots ◽  
Time Resolved Fluorescence ◽  
Time Resolved ◽  
Capping Ligands

FRET Study Between Carbon Quantum Dots and Malachite Green by Steady-State and Time-Resolved Fluorescence Spectroscopy

2020 ◽  
Vol 10 (3) ◽  
pp. 178-188
Author(s):  
Bipin Rooj ◽  
Ankita Dutta ◽  
Debojyoti Mukherjee ◽  
Sahidul Islam ◽  
Ujjwal Mandal
Keyword(s):  
Quantum Dots ◽  
Energy Transfer ◽  
Fluorescence Spectroscopy ◽  
Malachite Green ◽  
Dye Degradation ◽  
Fluorescence Emission ◽  
Carbon Quantum Dots ◽  
Time Resolved Fluorescence ◽  
Physical Processes ◽  
Time Resolved

Background: Understanding the interaction between different organic dyes and carbon quantum dots helps us to understand several photo physical processes like electron transfer, energy transfer, molecular sensing, drug delivery and dye degradation processes etc. Objective: The primary objective of this study is to whether the carbon quantum dots can act as an electron donor and can participate in the different photo physical processes. Methods: In this work, Carbon Quantum Dots (CQDLs) are synthesized in most economical and simple carbonization method where petals of Nelumbo nucifera L. are used as a carbon precursor. The synthesized CQDLs were characterized by using experimental techniques like UV−Vis absorption, FT-IR, Transmission Electron Microscopy (TEM), steadystate and time-resolved fluorescence spectroscopy. Results: The spectral analysis shows that the so synthesized CQDLs are spherical in shape and its diameter is around 4.2 nm. It shows the fluorescence emission maximum at 495 nm with a quantum yield of 4%. In this work the interaction between Carbon Quantum Dots (CQDLs) and an organic dye Malachite Green (MG) is studied using fluorescence spectroscopic technique under ambient pH condition (At pH 7). The quenching mechanism of CQDLs with MG was investigated using Stern-Volmer equation and time-resolved fluorescence lifetime studies. The results show that the dominant process of fluorescence quenching is attributed to Forster Resonance Energy Transfer (FRET) having a donor acceptor distance of 53 Å where CQDLs act as a donor and MG acts as an acceptor. Conclusion: This work has a consequence that CQDLs can be used as a donor species for different photo physical processes such as photovoltaic cell, dye sensitized solar cell, and also for antioxidant activity study.

Steady-state and time-resolved fluorescence studies on interactions of carbon “quantum” dots with nitrotoluenes

2017 ◽  
Vol 468 ◽  
pp. 300-307 ◽  
Author(s):  
Gregory E. LeCroy ◽  
K.A. Shiral Fernando ◽  
Christopher E. Bunker ◽  
Ping Wang ◽  
Nicholas Tomlinson ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Steady State ◽  
Carbon Quantum Dots ◽  
Time Resolved Fluorescence ◽  
Time Resolved ◽  
Fluorescence Studies

scholarly journals Mechanisms of fluorescence decays of colloidal CdSe–CdS/ZnS quantum dots unraveled by time-resolved fluorescence measurement

2015 ◽  
Vol 17 (41) ◽  
pp. 27588-27595 ◽  
Author(s):  
Hao Xu ◽  
Volodymyr Chmyrov ◽  
Jerker Widengren ◽  
Hjalmar Brismar ◽  
Ying Fu
Keyword(s):  
Quantum Dots ◽  
Radiative Recombination ◽  
Energy Relaxation ◽  
Fluorescence Decay ◽  
Fluorescence Measurement ◽  
Time Resolved Fluorescence ◽  
Time Resolved ◽  
Decay Spectrum

The fluorescence decay spectrum of colloidal CdSe-based quantum dots is characterized by energy relaxation and radiative recombination of photoexcited excitons.

Roles of adsorption sites in electron transfer from CdS quantum dots to molecular catalyst cobaloxime studied by time-resolved spectroscopy

2016 ◽  
Vol 18 (26) ◽  
pp. 17389-17397 ◽  
Author(s):  
Yun Ye ◽  
Yuxing Xu ◽  
Lei Huang ◽  
Dayong Fan ◽  
Zhaochi Feng ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Electron Transfer ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Transient Absorption Spectroscopy ◽  
Cds Quantum Dots ◽  
Time Resolved ◽  
Time Resolved Spectroscopy ◽  
Molecular Catalyst ◽  
Adsorption Sites

Electron transfer from CdS quantum dots (QDs) to cobaloxime (Co(dmgH)2pyCl) is demonstrated by transient absorption spectroscopy (TAS), and further confirmed using photoluminescence (PL) techniques.

Manganese-Doped ZnSe Quantum Dots as a Probe for Time-Resolved Fluorescence Detection of 5-Fluorouracil

2011 ◽  
Vol 83 (23) ◽  
pp. 9076-9081 ◽  
Author(s):  
Dong Zhu ◽  
Yun Chen ◽  
Liping Jiang ◽  
Jun Geng ◽  
Jianrong Zhang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Fluorescence Detection ◽  
Time Resolved Fluorescence ◽  
Time Resolved

scholarly journals Ligand removal from CdS quantum dots for enhanced photocatalytic H2 generation in pH neutral water

2016 ◽  
Vol 4 (8) ◽  
pp. 2856-2862 ◽  
Author(s):  
Christina M. Chang ◽  
Katherine L. Orchard ◽  
Benjamin C. M. Martindale ◽  
Erwin Reisner
Keyword(s):  
Quantum Dots ◽  
Hydrogen Evolution ◽  
Cds Quantum Dots ◽  
Photocatalytic Hydrogen Evolution ◽  
H2 Generation ◽  
Surface Capping ◽  
Cds Qds ◽  
Neutral Water ◽  
Photocatalytic H2 Generation ◽  
Capping Ligands

Photocatalytic hydrogen evolution activity of CdS QDs is 175 times higher in pH neutral water when surface capping ligands are removed.

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