scholarly journals Reversal of the Charge Transfer between Host and Dopant Atoms in Semiconductor Nanocrystals

Nano Letters ◽  
2004 ◽  
Vol 4 (11) ◽  
pp. 2251-2254 ◽  
Author(s):  
Torbjörn Blomquist ◽  
George Kirczenow
Keyword(s):  
Charge Transfer ◽  
Semiconductor Nanocrystals ◽  
Dopant Atoms

XPS Investigation of an Increasing C-H Vibration of Pentacene Doped with Indium

2013 ◽  
Vol 802 ◽  
pp. 279-283
Author(s):  
Annop Chanhom ◽  
Pakorn Prajuabwan ◽  
Sunit Rojanasuwan ◽  
Anuchit Jaruvanawat ◽  
Adirek Rangkasikorn ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Photoelectron Spectroscopy ◽  
Spectral Component ◽  
X Ray ◽  
Nickel Phthalocyanine ◽  
Characterization Technique ◽  
Xps Characterization ◽  
Benzene Rings ◽  
Dopant Atoms

We investigate the increase of C-H vibration in benzene rings of pentacene molecule upon doping with indium by the X-ray photoelectron spectroscopy (XPS) characterization technique. The risen of C-H vibration spectral component is employed to demonstrate the charge transfer between In dopant atoms and C atoms in benzene rings of pentacene molecule. This experiment can be used to explain the same mechanism of charge transfer between In dopant atoms and C atoms in In-doped nickel-phthalocyanine(NiPc).

scholarly journals Shallow distance-dependent triplet energy migration mediated by endothermic charge-transfer

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Runchen Lai ◽  
Yangyi Liu ◽  
Xiao Luo ◽  
Lan Chen ◽  
Yaoyao Han ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Charge Transfer ◽  
Semiconductor Nanocrystals ◽  
Electronic Coupling ◽  
Alternative Mechanism ◽  
Acceptor Pair ◽  
Triplet Energy ◽  
Distance Dependence ◽  
Donor Acceptor ◽  
Triplet Energy Transfer

AbstractConventional wisdom posits that spin-triplet energy transfer (TET) is only operative over short distances because Dexter-type electronic coupling for TET rapidly decreases with increasing donor acceptor separation. While coherent mechanisms such as super-exchange can enhance the magnitude of electronic coupling, they are equally attenuated with distance. Here, we report endothermic charge-transfer-mediated TET as an alternative mechanism featuring shallow distance-dependence and experimentally demonstrated it using a linked nanocrystal-polyacene donor acceptor pair. Donor-acceptor electronic coupling is quantitatively controlled through wavefunction leakage out of the core/shell semiconductor nanocrystals, while the charge/energy transfer driving force is conserved. Attenuation of the TET rate as a function of shell thickness clearly follows the trend of hole probability density on nanocrystal surfaces rather than the product of electron and hole densities, consistent with endothermic hole-transfer-mediated TET. The shallow distance-dependence afforded by this mechanism enables efficient TET across distances well beyond the nominal range of Dexter or super-exchange paradigms.

scholarly journals Imaging “Invisible” Dopant Atoms in Semiconductor Nanocrystals

Nano Letters ◽  
2011 ◽  
Vol 11 (12) ◽  
pp. 5553-5557 ◽  
Author(s):  
Aloysius A. Gunawan ◽  
K. Andre Mkhoyan ◽  
Andrew W. Wills ◽  
Malcolm G. Thomas ◽  
David J. Norris
Keyword(s):  
Semiconductor Nanocrystals ◽  
Dopant Atoms

Photoinduced charge transfer in composites of conjugated polymers and semiconductor nanocrystals

2003 ◽  
Vol 15 (1) ◽  
pp. 163-170 ◽  
Author(s):  
M Pientka ◽  
V Dyakonov ◽  
D Meissner ◽  
A Rogach ◽  
D Talapin ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Conjugated Polymers ◽  
Semiconductor Nanocrystals ◽  
Photoinduced Charge Transfer ◽  
Photoinduced Charge

Role of Tryptophan in Protein–Nanocrystals Interaction: Energy or Charge Transfer

2018 ◽  
Vol 233 (1) ◽  
pp. 41-54 ◽  
Author(s):  
Mona Mittal ◽  
Saurabh Gautam ◽  
Pramit Kumar Chowdhury ◽  
Shashank Deep ◽  
Sameer Sapra
Keyword(s):  
Charge Transfer ◽  
Steady State ◽  
Semiconductor Nanocrystals ◽  
Binding Model ◽  
Time Resolved ◽  
Tryptophan Residues ◽  
Mechanism Of Interaction ◽  
Pl Intensity ◽  
Time Resolved Photoluminescence

Abstract The understanding of the interaction between the semiconductor nanocrystals (NCs) and the proteins are essential for design and fabrication of nanocomposites for application in the field of biotechnology. Herein, we have studied the interaction between CdTe NCs and the proteins by steady-state and time-resolved photoluminescence (PL) spectroscopy. The steady-state PL intensity of CdTe NCs is quenched and enhanced in the presence of lysozyme and bovine serum albumin, respectively. However, the PL intensity of CdTe NCs is not affected with α-synuclein, indicating the role of tryptophan moiety in the protein–NCs interaction. The detailed analysis of PL data allows us to elucidate the dominant mechanism of interaction, i.e. charge or energy transfer, depending on the location of tryptophan residues in the protein. Assuming a Poisson statistic of lysozymes around NCs, the Poisson binding model is used to understand the kinetics of charge transfer from CdTe NCs to the lysozyme. It provides the average number of lysozymes present on the surface of one CdTe NC.

scholarly journals Efficient charge transfer in solution-processed PbS quantum dot–reduced graphene oxide hybrid materials

2015 ◽  
Vol 3 (27) ◽  
pp. 7088-7095 ◽  
Author(s):  
Beatriz Martín-García ◽  
Anatolii Polovitsyn ◽  
Mirko Prato ◽  
Iwan Moreels
Keyword(s):  
Graphene Oxide ◽  
Charge Transfer ◽  
Quantum Dot ◽  
Reduced Graphene Oxide ◽  
Hybrid Materials ◽  
Semiconductor Nanocrystals ◽  
Colloidal Semiconductor Nanocrystals ◽  
Reduced Graphene ◽  
Efficient Charge ◽  
Pbs Quantum Dot

We developed a general approach to couple silane-functionalized rGO with colloidal semiconductor nanocrystals, which show efficient and tunable charge transfer.

Electron transfer in a semiconductor heterostructure interface through electrophoretic deposition and a linker-assisted method

CrystEngComm ◽  
2020 ◽  
Vol 22 (9) ◽  
pp. 1664-1673 ◽  
Author(s):  
Yufeng Zhou ◽  
Xin Tong ◽  
Daniele Benetti ◽  
Zhiming M. Wang ◽  
Dongling Ma ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Charge Transfer ◽  
Electrophoretic Deposition ◽  
Transfer Rate ◽  
Semiconductor Nanocrystals ◽  
Photoelectrochemical Cells ◽  
Semiconductor Heterostructure ◽  
Charge Transfer Rate

Modulating the heterostructured interface of semiconductor nanocrystals is being widely explored to enhance the charge transfer rate in photoelectrochemical cells.

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