Novel properties of single molecule and the regulations

With scaling down of the size of electrical devices, molecular electronics, which uses single molecules as circuit components, has become vitally important．In molecular electronics, single-molecule devices not only provide potential solution for miniaturization of future circuit devices, but also contain novel physical properties due to the unique nanometer scale．Construction methods of single-molecule devices are reviewed, as well as their novel electrical, magnetic and quantum properties, and corresponding regulation methods．Developments of monomer devices are summarized, potential breakthroughs in molecular electronics are proposed．