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Titolo:
In2S3 nanocolloids with excitonic emission: In2S3 vs CdS comparative studyof optical and structural characteristics
Autore:
Nagesha, DK; Liang, XR; Mamedov, AA; Gainer, G; Eastman, MA; Giersig, M; Song, JJ; Ni, T; Kotov, NA;
Indirizzi:
Oklahoma State Univ, Dept Chem, Stillwater, OK 74078 USA Oklahoma State Univ Stillwater OK USA 74078 hem, Stillwater, OK 74078 USA Oklahoma State Univ, Dept Phys, Ctr Laser & Photon Res, Stillwater, OK 74078 USA Oklahoma State Univ Stillwater OK USA 74078 Res, Stillwater, OK 74078 USA Hahn Meitner Inst Kernforsch Berlin GmbH, Chem Phys Abt, D-15109 Berlin, Germany Hahn Meitner Inst Kernforsch Berlin GmbH Berlin Germany D-15109 Germany
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 31, volume: 105, anno: 2001,
pagine: 7490 - 7498
SICI:
1520-6106(20010809)105:31<7490:INWEEI>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
HYBRID ELECTROCHEMICAL/CHEMICAL SYNTHESIS; NANOCRYSTALLITE QUANTUM DOTS; CHEMICAL BATH DEPOSITION; BETA-IN2S3 THIN-FILMS; INDIUM SULFIDE; GOLD NANOPARTICLES; SEMICONDUCTOR NANOCRYSTALS; PHOTOPHYSICAL PROPERTIES; COLLOIDAL NANOPARTICLES; NANOSIZED PARTICLES;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
125
Recensione:
Indirizzi per estratti:
Indirizzo: Kotov, NA Oklahoma State Univ, Dept Chem, Stillwater, OK 74078 USA Oklahoma State Univ Stillwater OK USA 74078 water, OK 74078 USA
Citazione:
D.K. Nagesha et al., "In2S3 nanocolloids with excitonic emission: In2S3 vs CdS comparative studyof optical and structural characteristics", J PHYS CH B, 105(31), 2001, pp. 7490-7498

Abstract

Stable aqueous colloids of 2-3 nm In2S3 nanocrystals have been prepared byusing the classical method of nanoparticle stabilization by low molecular weight thiols. TEM crystal lattice spacing, X-ray diffraction, EDAX data, and electron diffraction indicate that the nanoparticles are predominantly in beta -In2S3 form. They exhibit relatively strong excitonic emission at 360-380 nm with a quantum yield of 1.5%. The excitonic radiative lifetime is 350 ns, which indicates that a direct allowed electronic transition is responsible for this emission. The NMR lines of the stabilizer are strongly broadened and shifted as a result of deshielding induced by electron withdrawing by positively charged metal ions. This effect quickly wears off as the carbon chain becomes longer and the separation between the hydrogen atoms ofthe stabilizer and the semiconductor surface increases. The broadening is attributed to the reduced mobility of the stabilizer in the nanoparticle shell. For US nanoparticles of the same size, this effect was found to be substantially stronger than for In2S3. The lower density of metal centers in In2S3 than in CdS, which serve as anchor points for the stabilizer, promotesgreater mobility of the stabilizer moieties.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 13/07/20 alle ore 10:18:14