Publicly Offered Research
Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
Aim of this project was to develop methods for efficient utilization of the energy of highly-excited nanoparticles (NPs) such as quantum dots (QDs) and perovskite nanocrystals (PNCs). Highly-excited NPs were generated by high-intensity laser irradiation. However, energy of such NPs is lost by ultrafast radiative and non-radiative recombination of photo-generated charge carriers. Therefore, extraction of absorbed energy towards practical applications is an important challenge. Here we developed photochemical and photophysical methods for extracting the energy of such NPs. At first, a part of the energy absorbed by QDs was extracted by activation of oxygen into singlet oxygen, which was followed by using singlet oxygen as the secondary energy source for chemical reactions. Here, we developed and used two novel singlet oxygen scavengers. Next, we applied highly-excited QDs to DNA molecules, which resulted in electron transfer from DNA to ionized QDs and formation of QD-DNA conjugates. Finally, we investigated stability of photo-generated charge carriers in highly-excited PNCs by preparation of self-assembled PNC structures. When compared with a PNC isolated in a solution, prolonged stability for photo-generated charge carriers was found for self-assembled structures, which is attributed to trapping or hopping of electrons and holes in or among PNCs. Successively, charge carriers in such PNCs were efficiently extracted by employing electron acceptors such as fullerene, which opens a method for efficient utilization of photoactivated PNCs for solar energy harvesting.
28年度が最終年度であるため、記入しない。
All 2017 2016 2015 Other
All Int'l Joint Research (2 results) Journal Article (10 results) (of which Int'l Joint Research: 9 results, Peer Reviewed: 10 results, Acknowledgement Compliant: 7 results, Open Access: 1 results) Presentation (23 results) (of which Int'l Joint Research: 14 results, Invited: 11 results)
Phys. Chem. Chem. Phys.
Volume: 19 Issue: 5 Pages: 3963-3969
10.1039/c6cp07550a
Angewandte Chemie International Edition
Volume: 56 Issue: 5 Pages: 1214-1218
10.1002/anie.201610070
Sensors and Actuators B: Chemical
Volume: 246 Pages: 1074-1079
10.1016/j.snb.2017.01.058
Analytical Sciences
Volume: 33 Issue: 2 Pages: 137-142
10.2116/analsci.33.137
130005316217
Nanoscale
Volume: 8 Issue: 28 Pages: 13687-13694
10.1039/c6nr03950b
Microchimica Acta
Volume: 1938 Issue: 11 Pages: 1-6
10.1007/s00604-016-1938-9
RSC Advances
Volume: 6 Issue: 19 Pages: 15686-15693
10.1039/c5ra24161h
Cell Medicine
Volume: 8 Issue: 1-2 Pages: 57-62
10.3727/215517915x689074
Journal of Biochemistry
Volume: 159 Issue: 2 Pages: 225-237
10.1093/jb/mvv098
Volume: 54 Issue: 13 Pages: 3892-3896
10.1002/anie.201501131
