Sample (IMAGE) Aalto University Caption Doctoral canditate Mikko Nisula holds in his hand a sample on a steel substrate. Behind the hand is a ALD reactor. Credit Mikko Raskinen / Aalto University Usage Restrictions None License Licensed 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.