Preparation and capacitances of oriented attachment CuO nanosheets and the MWNT/CuO nanocomposites

CuO nanosheets formed by oriented attachment of adjacent particles and the MWNT/CuO nanocomposites have been prepared through a simple hydrothermal process. The oriented attachment of adjacent particles through [111] and [002] crystallographic planes give rise to the formation of sheetlike morphology and the related mechanisms are discussed. Some needlelike and tubelike CuO nanocrystals came into being when the nanosheets rolled up and the capacitances of as-prepared MWNT/CuO nanocomposites were measured.