Aqueous Carbon-Nanotube–Amphiphilic-Block-Copolymer Nanoensembles: Towards Realization of Charge-Transfer Processes with Semiconductor Quantum Dots

Small ◽  
2007 ◽  
Vol 3 (3) ◽  
pp. 404-407 ◽  
Author(s):  
Grigoris Mountrichas ◽  
Stergios Pispas ◽  
Nikos Tagmatarchis
Keyword(s):  
Quantum Dots ◽  
Charge Transfer ◽  
Carbon Nanotube ◽  
Block Copolymer ◽  
Semiconductor Quantum Dots ◽  
Amphiphilic Block Copolymer ◽  
Transfer Processes

scholarly journals Size-Dependent Non-FRET Photoluminescence Quenching in Nanocomposites Based on Semiconductor Quantum Dots CdSe/ZnS and Functionalized Porphyrin Ligands

2012 ◽  
Vol 2012 ◽  
pp. 1-14 ◽  
Author(s):  
Eduard I. Zenkevich ◽  
Thomas Blaudeck ◽  
Alexander Milekhin ◽  
Christian von Borczyskowski
Keyword(s):  
Quantum Dots ◽  
Charge Transfer ◽  
Semiconductor Quantum Dots ◽  
Trap States ◽  
Quenching Rate ◽  
Time Resolved ◽  
Exciton Wave Function ◽  
Electron Hole Pair ◽  
Colloidal Semiconductor ◽  
Pl Quenching

We review recent experimental work to utilize the size dependence of the luminescence quenching of colloidal semiconductor quantum dots induced by functionalized porphyrin molecules attached to the surface to describe a photoluminescence (PL) quenching process which is different from usual models of charge transfer (CT) or Foerster resonant energy transfer (FRET). Steady-state and picosecond time-resolved measurements were carried out for nanocomposites based on colloidal CdSe/ZnS and CdSe quantum dots (QDs) of various sizes and surfacely attached tetra-mesopyridyl-substituted porphyrin molecules (“Quantum Dot-Porphyrin” nanocomposites), in toluene at 295 K. It was found that the major part of the observed strong quenching of QD PL in “QD-Porphyrin” nanocomposites can neither be assigned to FRET nor to photoinduced charge transfer between the QD and the chromophore. This PL quenching depends on QD size and shell and is stronger for smaller quantum dots: QD PL quenching rate constants scale inversely with the QD diameter. Based on the comparison of experimental data and quantum mechanical calculations, it has been concluded that QD PL quenching in “QD-Porphyrin” nanocomposites can be understood in terms of a tunneling of the electron (of the excited electron-hole pair) followed by a (self-) localization of the electron or formation of trap states. The major contribution to PL quenching is found to be proportional to the calculated quantum-confined exciton wave function at the QD surface. Our findings highlight that single functionalized molecules can be considered as one of the probes for the complex interface physics and dynamics of colloidal semiconductor QD.

scholarly journals Energy transfer processes in semiconductor quantum dots: bacteriorhodopsin hybrid system

2009 ◽  
Author(s):  
Aliaksandra Rakovich ◽  
Alyona Sukhanova ◽  
Nicolas Bouchonville ◽  
Michael Molinari ◽  
Michel Troyon ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Energy Transfer ◽  
Hybrid System ◽  
Semiconductor Quantum Dots ◽  
Transfer Processes

Using metal complex-labeled peptides for charge transfer-based biosensing with semiconductor quantum dots

2009 ◽  
Author(s):  
Igor L. Medintz ◽  
Thomas Pons ◽  
Scott A. Trammell ◽  
Juan B. Blanco-Canosa ◽  
Philip E. Dawson ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Charge Transfer ◽  
Metal Complex ◽  
Semiconductor Quantum Dots

Encapsulation of semiconductor quantum dots into the central cores of block copolymer cylindrical and toroidal micelles

RSC Advances ◽  
2013 ◽  
Vol 3 (46) ◽  
pp. 24625 ◽  
Author(s):  
Xiaobo Nie ◽  
Jiangping Xu ◽  
Jie Cui ◽  
Bai Yang ◽  
Wei Jiang
Keyword(s):  
Quantum Dots ◽  
Block Copolymer ◽  
Semiconductor Quantum Dots

Fabrication and properties of a supramolecular hybrid hydrogel doped with CdTe quantum dots

RSC Advances ◽  
2015 ◽  
Vol 5 (72) ◽  
pp. 58746-58754 ◽  
Author(s):  
Xi Xie ◽  
Dong Ma ◽  
Li-Ming Zhang
Keyword(s):  
Quantum Dots ◽  
Block Copolymer ◽  
Quantum Dot ◽  
Self Assembly ◽  
Cdte Quantum Dots ◽  
Amphiphilic Block Copolymer ◽  
Host Molecule ◽  
Supramolecular Hydrogel ◽  
Hybrid Hydrogel ◽  
Cdte Quantum Dot

A fluorescent supramolecular hydrogel was fabricated based on the host–guest self-assembly between the amphiphilic block copolymer on the CdTe quantum dot (QD) surface and the cyclic oligosaccharide host molecule, α-cyclodextrin (α-CD).

scholarly journals Electrically tunable quantum interfaces between photons and spin qubits in carbon nanotube quantum dots

2016 ◽  
Vol 14 (08) ◽  
pp. 1650047
Author(s):  
Ze-Song Shen ◽  
Fang-Yu Hong
Keyword(s):  
Quantum Dots ◽  
Carbon Nanotube ◽  
Quantum Spin ◽  
Spin Qubits ◽  
Local Electron ◽  
Experimental Conditions ◽  
Electrical Control ◽  
Transfer Processes ◽  
State Transfer ◽  
Electrical Manipulation

We present a new scheme for quantum interfaces (QIs) to accomplish the interconversion of photonic qubits and spin qubits based on optomechanical resonators and the spin–orbit-induced interactions in suspended carbon nanotube quantum dots (CNTQDs). This interface implements quantum spin transducers and further enables electrical manipulation of local electron spin qubits, which lays the foundation for all-electrical control of state transfer protocols between two distant quantum nodes in a quantum network. We numerically evaluate the state transfer processes and proceed to estimate the effect of each coupling strength on the operation fidelities. The simulation suggests that high operation fidelities are obtainable under realistic experimental conditions.

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