Adjustment of the Band Gap Energies of Biostabilized CdS Nanoparticles by Application of Statistical Design of Experiments

Autor:	H. Strohm, Ch. Barglik-Chory, G. Müller, Ch. Remenyi
Přispěvatelé:	Publica
Rok vydání:	2004
Předmět:	chemistry.chemical_classification Statistical design Sulfide Chemistry Band gap Analytical chemistry Nanoparticle Surfaces Coatings and Films Quantum dot Materials Chemistry Physical and Theoretical Chemistry Absorption (electromagnetic radiation) Semiconductor Nanoparticles Colloidal synthesis
Zdroj:	The Journal of Physical Chemistry B. 108:7637-7640
ISSN:	1520-5207 1520-6106
DOI:	10.1021/jp036476x
Popis:	The colloidal synthesis of CdS nanoparticles with the biostabilizers cysteine and glutathione, respectively, at pH values ranging from 4 to 10 is described. For the adjustment of their UV/Vis absorption properties and hence their band gap energies, the Statistical Design of Experiments (DoE) was used. This method allows the simultaneous variation of the synthesis parameters in a systematic manner, and thereby synergistic interaction effects can be obtained. The band gap energies of the quantum dots can be tuned from 3.32 to 4.26 eV by varying kind and concentration of stabilizer, pH value, and concentration of sulfide source. The energy position is significantly dependent on the interaction between the pH value and the concentration of the stabilizer, and the effect of high glutathione concentration is opposite at acidic and alkaline conditions thus leading to band gaps of 4.10 eV at pH = 6 and of 3.64 eV at pH = 10. Examples for the synthesis of semiconductor nanoparticles with predefined spectroscopic properties and preset preparation conditions, e.g., alkaline conditions for the implementation of acid-sensitive dopants, are given.
Databáze:	OpenAIRE
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