Silicon nanoparticle photophysics and singlet oxygen generation
The effect of molecular oxygen and water on the blue photoluminescence of silicon nanoparticles synthesized by anodic oxidation of silicon wafers and surface functionalized with 2-methyl 2-propenoic acid methyl ester is investigated. The particles of 3 ± 1 nm diameter and a surface composition of Si...
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| Formato: | Capítulo de libro |
| Lenguaje: | Inglés |
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2010
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| Acceso en línea: | Registro en Scopus DOI Handle Registro en la Biblioteca Digital |
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| LEADER | 10680caa a22016457a 4500 | ||
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| 001 | PAPER-7764 | ||
| 003 | AR-BaUEN | ||
| 005 | 20230518203732.0 | ||
| 008 | 190411s2010 xx ||||fo|||| 00| 0 eng|d | ||
| 024 | 7 | |2 scopus |a 2-s2.0-77954306386 | |
| 024 | 7 | |2 cas |a silicon, 7440-21-3; Silicon, 7440-21-3; Singlet Oxygen, 17778-80-2 | |
| 040 | |a Scopus |b spa |c AR-BaUEN |d AR-BaUEN | ||
| 030 | |a LANGD | ||
| 100 | 1 | |a Llansola Portolés, M.J. | |
| 245 | 1 | 0 | |a Silicon nanoparticle photophysics and singlet oxygen generation |
| 260 | |c 2010 | ||
| 270 | 1 | 0 | |m Gonzalez, M. C.; INIFTA, Dpto. Química, UNLP, CC 16 Suc. 4, 1900 La Plata, Argentina; email: gonzalez@inifta.unlp.edu.ar |
| 506 | |2 openaire |e Política editorial | ||
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| 504 | |a Alegre, M.L., Gerones, M., Rosso, J.A., Bertolotti, S.G., Braun, A.M., Martire, D.O., Gonzalez, M.C., (2000) J. Phys. Chem. A, 104, pp. 3117-3125 | ||
| 520 | 3 | |a The effect of molecular oxygen and water on the blue photoluminescence of silicon nanoparticles synthesized by anodic oxidation of silicon wafers and surface functionalized with 2-methyl 2-propenoic acid methyl ester is investigated. The particles of 3 ± 1 nm diameter and a surface composition of Si3O6(C5O2H 8) exhibit room-temperature luminescence in the wavelength range 300-600 nm upon excitation with 300-400 nm light. The luminescence shows vibronic resolution and high quantum yields in toluene suspensions, while a vibronically unresolved spectrum and lower emission quantum yields are observed in aqueous suspensions. The luminescence intensity, though not the spectrum features, depends on the presence of dissolved O2. Strikingly, the luminescence decay time on the order of 1 ns does not depend on the solvent or on the presence of O2. To determine the mechanisms involved in these processes, time-resolved and steady-state experiments are performed. These include low-temperature luminescence, heavy atom effect, singlet molecular oxygen (1O2) phosphorescence detection, reaction of specific probes with 1O2, and determination of O 2 and N2 adsorption isotherms at 77 K. The results obtained indicate that physisorbed O2 is capable of quenching nondiffusively the particle luminescence at room temperature. The most probable mechanism for 1O2 generation involves the energy transfer from an exciton singlet state to O2 to yield an exciton triplet of low energy (<0.98 eV) and 1O2. In aqueous solutions, excited silicon nanoparticles are able to reduce methylviologen on its surface. © 2010 American Chemical Society. |l eng | |
| 593 | |a INIFTA, Dpto. Química, UNLP, CC 16 Suc. 4, 1900 La Plata, Argentina | ||
| 593 | |a Departamento Química Biológica, Facultad de Ciencias Exactas y Naturales, Ciudad Universitaria, Pabellón 2, Piso 4, C1428EHA Buenos Aires, Argentina | ||
| 593 | |a Fac Cs. Exactas, Físico-Químicas y Naturales, UNRC, Ruta Nac. 36, Km. 601, X5804BYA Río Cuarto, Argentina | ||
| 593 | |a INQUIMAE, Facultad de Ciencias Exactas y Naturales, Ciudad Universitaria, Pabellón 2, Piso 3, C1428EHA Buenos Aires, Argentina | ||
| 690 | 1 | 0 | |a AQUEOUS SOLUTIONS |
| 690 | 1 | 0 | |a AQUEOUS SUSPENSIONS |
| 690 | 1 | 0 | |a BLUE PHOTOLUMINESCENCE |
| 690 | 1 | 0 | |a EMISSION QUANTUM YIELD |
| 690 | 1 | 0 | |a FUNCTIONALIZED |
| 690 | 1 | 0 | |a HEAVY ATOM EFFECTS |
| 690 | 1 | 0 | |a LOW ENERGIES |
| 690 | 1 | 0 | |a LOW-TEMPERATURE LUMINESCENCE |
| 690 | 1 | 0 | |a LUMINESCENCE DECAY TIME |
| 690 | 1 | 0 | |a LUMINESCENCE INTENSITY |
| 690 | 1 | 0 | |a METHYL ESTERS |
| 690 | 1 | 0 | |a METHYLVIOLOGEN |
| 690 | 1 | 0 | |a PHOTOPHYSICS |
| 690 | 1 | 0 | |a PHYSISORBED |
| 690 | 1 | 0 | |a ROOM TEMPERATURE |
| 690 | 1 | 0 | |a SILICON NANOPARTICLES |
| 690 | 1 | 0 | |a SINGLET MOLECULAR OXYGEN |
| 690 | 1 | 0 | |a SINGLET OXYGEN GENERATION |
| 690 | 1 | 0 | |a SINGLET STATE |
| 690 | 1 | 0 | |a SPECTRUM FEATURES |
| 690 | 1 | 0 | |a SURFACE COMPOSITIONS |
| 690 | 1 | 0 | |a TIME-RESOLVED |
| 690 | 1 | 0 | |a TOLUENE SUSPENSIONS |
| 690 | 1 | 0 | |a WAVELENGTH RANGES |
| 690 | 1 | 0 | |a ADSORPTION |
| 690 | 1 | 0 | |a ANODIC OXIDATION |
| 690 | 1 | 0 | |a DISSOLUTION |
| 690 | 1 | 0 | |a ENERGY TRANSFER |
| 690 | 1 | 0 | |a ESTERS |
| 690 | 1 | 0 | |a EXCITONS |
| 690 | 1 | 0 | |a GAS GENERATORS |
| 690 | 1 | 0 | |a LUMINESCENCE |
| 690 | 1 | 0 | |a MOLECULAR OXYGEN |
| 690 | 1 | 0 | |a NANOPARTICLES |
| 690 | 1 | 0 | |a PLASMA DIAGNOSTICS |
| 690 | 1 | 0 | |a SEMICONDUCTING SILICON COMPOUNDS |
| 690 | 1 | 0 | |a SILICON OXIDES |
| 690 | 1 | 0 | |a SUSPENSIONS (FLUIDS) |
| 690 | 1 | 0 | |a TOLUENE |
| 690 | 1 | 0 | |a SILICON WAFERS |
| 690 | 1 | 0 | |a NANOPARTICLE |
| 690 | 1 | 0 | |a SILICON |
| 690 | 1 | 0 | |a SINGLET OXYGEN |
| 690 | 1 | 0 | |a ARTICLE |
| 690 | 1 | 0 | |a CHEMISTRY |
| 690 | 1 | 0 | |a INFRARED SPECTROSCOPY |
| 690 | 1 | 0 | |a LUMINESCENCE |
| 690 | 1 | 0 | |a NANOTECHNOLOGY |
| 690 | 1 | 0 | |a PHOTOCHEMISTRY |
| 690 | 1 | 0 | |a HYDROGEN-ION CONCENTRATION |
| 690 | 1 | 0 | |a LUMINESCENCE |
| 690 | 1 | 0 | |a NANOPARTICLES |
| 690 | 1 | 0 | |a NANOTECHNOLOGY |
| 690 | 1 | 0 | |a PHOTOCHEMISTRY |
| 690 | 1 | 0 | |a SILICON |
| 690 | 1 | 0 | |a SINGLET OXYGEN |
| 690 | 1 | 0 | |a SPECTROSCOPY, FOURIER TRANSFORM INFRARED |
| 650 | 1 | 7 | |2 spines |a PH |
| 700 | 1 | |a David Gara, P.M. | |
| 700 | 1 | |a Kotler, M.L. | |
| 700 | 1 | |a Bertolotti, S. | |
| 700 | 1 | |a San Román, E. | |
| 700 | 1 | |a Rodríguez, H.B. | |
| 700 | 1 | |a Gonzalez, M.C. | |
| 773 | 0 | |d 2010 |g v. 26 |h pp. 10953-10960 |k n. 13 |p Langmuir |x 07437463 |t Langmuir | |
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| 856 | 4 | 0 | |u https://doi.org/10.1021/la100980x |y DOI |
| 856 | 4 | 0 | |u https://hdl.handle.net/20.500.12110/paper_07437463_v26_n13_p10953_LlansolaPortoles |y Handle |
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