Quantum wire and dot formation by chemical vapor deposition and molecular layer deposition of one-dimensional conjugated polymer

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Abstract
Using the reaction between two types of molecules, I [terephthalaldehyde (TPA)] and II [p‐phenylenediamine (PPDA), 4,4’‐diaminodiphenyl ether (DDE), 4,4’‐diaminodiphenyl sulfide (DDS), or 1,4‐diaminodiphenylmethane (DDM)], we fabricate quantum wires and quantum dots by chemical vapor deposition. In the TPA/PPDA film, an exciton absorption peak occurs near 500 nm, indicating that long conjugated chains (quantum wire) are formed. In TPA/DDE, TPA/DDS, and TPA/DDM films, which have quantum dots consisting of three benzene rings separated by barriers of ‐O, ‐S‐, and ‐CH2‐ bonds, blue shifts of the absorption band occur due to an electron confinement. We also demonstrate molecular layer deposition of the TPA/PPDA film.