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Artificial molecule quantum dot cells are a promising currentless nanotechnology, which can be used for realising fully digital circuits and systems. A dual-edge triggered module and flip-flop sequential circuit are proposed using quantum dot cellular automata (QCA) cells by arranging special clock zones subtly and serially. A D flip-flip case is given to show how a low power dual-edge triggered flip-flop can be realised using quantum dot cell arrays. The proposed structure is promising in building future nanoscale ultra low power information processing systems and may inspire higher clock speed applications in QCA.