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Microwave-assisted polyol synthesis of aluminium- and indium-doped ZnO nanocrystals by Elin Hammarberg; Anna Prodi-Schwab; Claus Feldmann is a Chemistry article available to read on EtoBox.

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Microwave heating is applied to prepare suspensions of ZnO:In (IZO) and ZnO:Al (AZO) nanocrystals in diethylene glycol as a high-boiling multidentate alcohol (so-called polyol). Both n-doped zinc oxides are realized with high yields and in suspensions with solid contents up to 10 wt-%. These suspensions are colloidally stable for months. According to dynamic light scattering, scanning electron microscopy, transmission electron microscopy, X-ray diffraction patterns and Brunauer-Emmett-Teller analysis asprepared particles turn out to be single crystalline with an average diameter of 10-15 nm, a near monodisperse size distribution, and a low degree of agglomeration. As-prepared samples exhibit high resistivities due to the adhesion of DEG as a stabilizer on the particle surface. Subsequent to specific thermal post-treatment resistivities of 2.0 Â 10 À1 and 5.7 Â 10 À1 Xcm are obtained for IZO and AZO powders, respectively. As a proof of the concept, thin layers are deposited on glass plates using a simple solvent evaporation technique. Post-treated layers exhibit a visible transmittance of about 80% and resistivities of 2.1 Â 10 À1 Xcm (IZO) and 2.6 Â 10 À1 Xcm (AZO). The bandgap of

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Author

Elin Hammarberg; Anna Prodi-Schwab; Claus Feldmann

Publisher

Elsevier Science; Elsevier ; Elsevier Inc.; Elsevier BV (ISSN 0021-9797)

Published

2009

Language

EN

Field

Chemistry (Physical Sciences)