Size-Selective and Epitaxial Electrochemical/Chemical Synthesis of Sulfur-Passivated Cadmium Sulfide Nanocrystals on Graphite

Autor:	J. A. Ganske, Reginald M. Penner, and J. C. Hemminger, S. Gorer
Rok vydání:	1998
Předmět:	Cadmium Inorganic chemistry Nanoparticle chemistry.chemical_element General Chemistry Biochemistry Sulfur Catalysis Cadmium sulfide chemistry.chemical_compound Colloid and Surface Chemistry chemistry Chemical engineering Nanocrystal Particle size Selected area diffraction Polysulfide
Zdroj:	Journal of the American Chemical Society. 120:9584-9593
ISSN:	1520-5126 0002-7863
DOI:	10.1021/ja981676l
Popis:	Cadmium metal nanocrystallites (NCs), prepared on graphite surfaces by electrochemical deposition, are employed as precursors to synthesize core−shell nanoparticles consisting of a crystalline cadmium sulfide (CdS) core and a sulfur or polysulfide shell. Core−shell NCs having a large CdS core (radii RCdS > 40 A) were prepared by exposing electrodeposited cadmium particles (RCd > 25 A) to H2S at 300 °C, whereas nanoparticles having a smaller CdS core (down to 17 A) were obtained from cadmium precursor particles via a Cd(OH)2 intermediate. For both large-core and small-core CdS nanoparticles, the addition of the sulfur capping layer (ranging in thickness from 5 to 30 A) occurred during exposure to H2S at 300 °C. Transmission electron microscopy (TEM) and selected area electron diffraction (SAED) data show that the synthesis of CdS NCs proceeded on a particle-by-particle basis such that the particle size and monodispersity of the CdS core were directly related to those of the cadmium metal precursor particle...
Databáze:	OpenAIRE
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