Nature Materials 3, 361–364 (2004).

It has been drawn to the journal's attention that there is considerable overlap between an earlier publication by these authors1 and the material presented in this paper. At no time during the consideration of this paper for publication in Nature Materials did the authors inform our editorial staff of the consideration of this related work by another journal. The authors' failure to do so constitutes a clear breach of the strict publication policy of Nature Materials (http://www.nature.com/nmat/authors/auguide.html).

Our readers are reminded that our editorial policy requires that all submissions to Nature Materials must be accompanied by copies of all related papers that are currently under consideration elsewhere. This includes work submitted elsewhere after the original date of submission to Nature Materials. For further discussion of these issues, readers are directed to the editorial of the January 2005 issue of Nature Materials2.