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Volumn 112, Issue 49, 2008, Pages 19625-19634

Interfacial electron transfer dynamics in a single CdTe quantum dot-pyromellitimide conjugate

Author keywords

[No Author keywords available]

Indexed keywords

ACCEPTOR STATE; ANALYTICAL RESULTS; CDTE; CHLOROFORM SOLUTIONS; ELECTRON TRANSFERS; ENERGY DIFFUSIONS; ET PROCESS; GLASS SURFACES; INTERFACIAL ELECTRON TRANSFER DYNAMICS; INTERMITTENCY; LASER FLASH PHOTOLYSIS; LIGHT EMITTING DIODE LEDS; MECHANISTIC STUDIES; NANOSECOND TRANSIENT ABSORPTIONS; PHOTOLUMINESCENCE BANDS; PL SPECTROSCOPIES; QD EMISSIONS; QD-BASED DEVICES; QUANTUM DOTS; RESONANCE CONDITIONS; SINGLE PARTICLES; THIOL LINKERS; TIME-RESOLVED EMISSION SPECTROSCOPIES; TURNOVER RATES;

EID: 64149094865     PISSN: 19327447     EISSN: 19327455     Source Type: Journal    
DOI: 10.1021/jp807591d     Document Type: Article
Times cited : (48)

References (87)
  • 42
    • 0000808972 scopus 로고    scopus 로고
    • Wiederrecht, G. P.; A. Svec, W.; Wasielewski, M. R. J. Phys. Chem. B 1999, 103, 1386-1389.
    • Wiederrecht, G. P.; A. Svec, W.; Wasielewski, M. R. J. Phys. Chem. B 1999, 103, 1386-1389.
  • 64
    • 64349099808 scopus 로고    scopus 로고
    • The sum of the oxidation and reduction potentials for PI-CA should be approximately the same as the lowest excited singlet state energy of the PI-CA 3.4 eV, Using this relationship, the oxidation potential was calculated to be about +2.8 V vs. NHE. This value is significantly lower than the potential of the valence band edge, suggesting that the hole transfer from the photoexcited QDs to the adsorbed PI-CA is almost impossible
    • The sum of the oxidation and reduction potentials for PI-CA should be approximately the same as the lowest excited singlet state energy of the PI-CA (3.4 eV). Using this relationship, the oxidation potential was calculated to be about +2.8 V vs. NHE. This value is significantly lower than the potential of the valence band edge, suggesting that the hole transfer from the photoexcited QDs to the adsorbed PI-CA is almost impossible.
  • 69
    • 64349116299 scopus 로고    scopus 로고
    • We also used the polymer matrices, such as poly(methyl methacrylate, PMMA) and polystylene (PS, to immobilize the CdTe/PI-CA conjugates on the cover glass surface. However, in this case, no significant quenching of the QD emission was observed at the single-particle and ensemble levels film thicknesses were several hundreds of nanometers and several tens of micrometers, respectively, These results indicated that the complex between the CdTe QD and PI-CA is not stable when numerous polymer molecules are present around the QDs
    • We also used the polymer matrices, such as poly(methyl methacrylate) (PMMA) and polystylene (PS), to immobilize the CdTe/PI-CA conjugates on the cover glass surface. However, in this case, no significant quenching of the QD emission was observed at the single-particle and ensemble levels (film thicknesses were several hundreds of nanometers and several tens of micrometers, respectively). These results indicated that the complex between the CdTe QD and PI-CA is not stable when numerous polymer molecules are present around the QDs.
  • 84
    • 64349086462 scopus 로고    scopus 로고
    • The solvent reorganization energy (λs) in the continuum approximation is given by eq 1182 λs, e 2/4πε0( 1/2rD+1/2rA-1/d DA)(1/n2-1/ε, 11) where rD and r A are the radii of the CdTe QD (2.4 nm) and PI (0.35 nm 85, respectively, and dDA is the sum of rD and rA. The permittivity constant of a vacuum, the refractive index and dielectric constant of the solvent are represented by ε0, n, and ε, respectively n, 1.4459 and ε, 4.806 for chloroform at 20°C
    • 0, n, and ε, respectively (n = 1.4459 and ε = 4.806 for chloroform at 20°C).


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.