Abstract
Transition metal encapsulated carbon onions with high crystallinity and economic scalability were fabricated by a facile chemical vapor deposition method. Then the as-prepared metal encapsulated carbon onions were subjected to microwave assisted acid digestion procedures to remove the metal impurities. High-resolution transition electron microscopic images and Raman spectrum demonstrated the efficient removal of metal phase and the formation of defective hollow carbon onions(HCNOs) under microwave assisted strong acid treatment. It was believed that the acid can corrode the outer carbon shell of onions while the microwave can induce local heating of metal impurities. Under the synergistic effect, the metal phase converts into soluble salt and leaves defective hollows in the center of onions.
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