ZnO nanosheets (IMAGE) Incheon National University Caption ZnO nanosheets were thermally treated at three different temperatures (400, 600, & 800°C) to tune their hole density. The hole density consistently reduced as the temperature was increased from 400°C to 800°C Credit Manjeet Kumar, Incheon National 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.