Composite particles containing metallic shell layers are provided. The particles may include a coating layer, such as of a protective or electrically non-conducting material, over an outermost metallic shell layer. The particle preferably has a plasmon resonance associated with at least one metallic...http://www.google.de/patents/US20020187347?utm_source=gb-gplus-sharePatent US20020187347 - Multi-layer nanoshells
