Copper-doped tungstic acid nanocrystal (IMAGE) Hokkaido University Caption (Left) A single copper-doped tungstic acid nanocrystal; (right) Atomic resolution image of the nanocrystal. (Photos: Melbert Jeem) Credit Melbert Jeem Usage Restrictions This image is copyrigted but may be used to report on this press rleease as long as the copyright holder is credited. License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.