Photonic Crystals with Thermally Switchable Stop Bands Fabricated from Se@Ag₂Se Spherical Colloids

Amorphous Se (a-Se) as monodispersed spherical colloids are used as templates to synthesize core–shell particles comprising a-Se cores and Ag2Se shells (see picture). As the temperature is increased, the particles undergo two phase transitions, the second of which is reversible. By exploiting the reversibility between the semiconductive and superionic phases of the Ag2Se shell, photonic crystals with thermally switchable stop bands are made. Supporting information for this article is available on the WWW under http://www.wiley-vch.de/contents/jc_2002/2005/z462906_s.pdf or from the author. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.