Details

Autor(en) / Beteiligte

• Viswanatha, Ranjani
• Sarma, D. D.

Titel

Study of the Growth of Capped ZnO Nanocrystals: A Route to Rational Synthesis

Ist Teil von

• Chemistry : a European journal, 2005-12, Vol.12 (1), p.180-186

Ort / Verlag

Weinheim: WILEY-VCH Verlag

Erscheinungsjahr

2005

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• We report the study of complex and unexpected dependencies of nanocrystal size as well as nanocrystal‐size distribution on various reaction parameters in the synthesis of ZnO nanocrystals using poly(vinyl pyrollidone) (PVP) as a capping agent. This method establishes a qualitatively different growth mechanism to the anticipated Ostwald ripening behavior. The study of size‐distribution kinetics and an understanding of the observed non‐monotonic behaviors provides a route to rational synthesis. We used a simple, but accurate, approach to estimate the size‐distribution function of nanocrystals from the UV‐absorption spectrum. Our results demonstrate the accuracy and generality of this approach, and we also illustrate its application to various semiconducting nanocrystals, such as ZnO, ZnS, and CdSe, over a wide size range (1.8–5.3 nm). Capped size! A time‐resolved study of the solution growth of ZnO nanocrystals and their size distribution in real time in the presence of a capping agent was conducted by using UV‐absorption spectroscopy. The optimal conditions for ZnO nanocrystal synthesis with narrowest size distribution were defined (see graph), and non‐monotonic dependencies were established, providing a route to rational synthesis.