Retention of CdS/ZnS Quantum Dots (QDs) on the Root Epidermis of Woody Plant and Its Implications by Benzo[a]pyrene: Evidence from the in Situ Synchronous Nanosecond Time-Resolved Fluorescence Spectra Method

2018 ◽  
Vol 66 (4) ◽  
pp. 814-821 ◽  
Author(s):  
Ruilong Li ◽  
Haifeng Sun ◽  
Shaopeng Wang ◽  
Yinghui Wang ◽  
Kefu Yu
Keyword(s):  
Quantum Dots ◽  
Fluorescence Spectra ◽  
Woody Plant ◽  
Time Resolved Fluorescence ◽  
Time Resolved ◽  
Root Epidermis

Charge and Energy Transfer Between CdSe Quantum Dots and Polyaniline

2016 ◽  
Vol 16 (4) ◽  
pp. 3909-3913 ◽  
Author(s):  
Liang Xu ◽  
Xingbin Huang ◽  
Wenjiang Dai ◽  
Punan Sun ◽  
Xuanlin Chen ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Energy Transfer ◽  
Fluorescence Spectra ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Cdse Quantum Dots ◽  
Time Resolved Fluorescence ◽  
Cdse Qds ◽  
Time Resolved ◽  
Two Factors

CdSe quantum dots (QDs) and polyaniline (PAni) were mixed to prepare CdSe QDs/PAni complex. PAni can quench the fluorescence of CdSe QDs. Fluorescence intensity of CdSe QDs/PAni complex is related to the size of CdSe QDs and the concentration of PAni. UV-Vis absorption spectra, fluorescence spectra, time-resolved fluorescence spectroscopy were used to analys the quenching phenomenon. The mechanism of fluorescence quenching is dependent on two factors: on one hand, the Förster resonance energy transfer from CdSe to PAni; on the other hand, PAni can intercept the charge relaxation process of CdSe and lead to the interruption of radiative recombination.

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.

Fluorescence dynamics of poly (N-vinylcarbazole) in fluid solution. Multivariate analysis of time-resolved fluorescence spectra

1993 ◽  
Vol 208 (3-4) ◽  
pp. 283-289 ◽  
Author(s):  
Hisashi Sakai ◽  
Akira Itaya ◽  
Hiroshi Masuhara ◽  
Keiji Sasaki ◽  
Satoshi Kawata
Keyword(s):  
Multivariate Analysis ◽  
Fluorescence Spectra ◽  
Fluid Solution ◽  
Time Resolved Fluorescence ◽  
Time Resolved

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

Lifetimes of normal and tumorous human lung tissues by time-resolved fluorescence spectra

1996 ◽  
Author(s):  
Wei Zheng ◽  
Zhiwei Huang ◽  
Shusen Xie ◽  
Teck-Chee Chia ◽  
Zukang Lu ◽  
...  
Keyword(s):  
Fluorescence Spectra ◽  
Human Lung ◽  
Time Resolved Fluorescence ◽  
Time Resolved
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