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From budget-friendly options to smart rings and rugged outdoor smartwatches, these are the best fitness trackers we have tested. When you purchase through links on our site, we may earn an ...

University of Münster, Institute of Inorganic and Analytical Chemistry, Corrensstraße 28/30, 48149 Münster, Germany University of Münster, Institute of Inorganic and Analytical Chemistry, ...

School of Environment and Energy, The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters (Ministry of Education), South China University of Technology, Guangzhou 510006 ...

Doped elements form impurity levels in the forbidden band of a wide band gap semiconductor, narrowing the energy gap required for photoexcitation and making it responsive to visible light. Figure 2.