Stability and quantum yield effects of small molecule additives on solutions of semiconductor nanoparticles

• Published in: Journal of colloid and interface science 2005-10, Vol.290 (2), p.437-443
• Main Authors: Gaunt, Joseph A., Knight, Alex E., Windsor, Stuart A., Chechik, Victor
• Format: Article
• Language: English
• Subjects: Adsorption; Amine; Amines - chemistry; Antioxidant; Antioxidants - chemistry; Cadmium Compounds - chemistry; CdSe; CdSe/ZnS; CdSe/ZnSe; Chemistry; Chloroform - chemistry; Colloidal state and disperse state; Exact sciences and technology; General and physical chemistry; Nanoparticles; Nanostructures - chemistry; Oxides - chemistry; Particle Size; Phosphine; Phosphines - chemistry; Photochemistry; Photooxidation; Photostability; Physical and chemical studies. Granulometry. Electrokinetic phenomena; Physical chemistry of induced reactions (with radiations, particles and ultrasonics); Quantum Theory; Selenium Compounds - chemistry; Semiconductors; Solutions - chemistry; Solvents - chemistry; Sulfides - chemistry; Surface Properties; Zinc Compounds - chemistry
• ISSN: 0021-9797; 1095-7103
• DOI: 10.1016/j.jcis.2005.04.073

The effect of additives on the photostability of semiconductor nanoparticles was studied using CdSe, CdSe/ZnSe and CdSe/ZnS particles of various sizes and composition. The additives included phosphine oxides, amines, and antioxidants. Strong initial enhancement of band edge emission by hexadecylamine was observed for the uncoated particles but stability over a week period in light and air was shown to be poor. Inorganic coatings rendered the nanoparticles initially insensitive to additive but provided little extra stability in terms of photoluminescence. Antioxidant was shown to be effective at reducing the rate of photooxidative degradation for all particles in chloroform but not in toluene.