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We demonstrate in this paper the shape-controlled synthesis of a-Fe 2 O 3 rhombohedra anchored graphene nanocomposites through a simple hydrothermal strategy by adopting inorganic species in the synthesis system. TEM investigations reveal that the rhombohedra with an average diameter of 80 nm is formed through oriented attachment of primary nanocrystals assisted by Ostwald ripening, and CH 3 COONa inorganic surfactant played an important role in control over the final morphology of the products. As high-performance anodes for lithium-ion batteries, the obtained Fe 2 O 3 rhombohedra/graphene composite exhibits the first reversible capacity of 905.3 mAh g À1 , and high capacity retention of 85.7% after 50 cycles. These values are much higher than those of bare Fe 2 O 3 and Fe 2 O 3 particle/graphene composites, indicating its excellent electrochemical stability. These results give us a guideline for the study of the morphology-dependent properties of functional oxide materials as well as further applications for magnetic materials, lithium-ion batteries, and gas sensors.

Termite is a dangerous insect that can cause serious damage to civil structures. In southern China, termites have raised a big issue for water conservation dams. Termites cause many serious damages to earth dikes. Hidden damages, caused by long-term activity of termite, is difficult to be detected until it becomes visible, often, too late. The traditional method to find a termitarium is by tracing the path of termites through excavation. This approach itself could be destructive to dams. In this paper, a resistivity imaging survey method for detecting termitaria in a dam near Wuhan, China is presented. By analysis of the hill scale and its physical properties at the site, it is found that a geophysical survey technique is feasible for detecting termitaria with a certain size. Through theoretical analysis, modeling and field investigation, a two-dimensional electrical imaging survey scheme was proposed. The resistivity imaging survey results were confirmed by excavating the anomalous spots.