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N-(3-nitrobenzylidene)-p-phenylenediamine (NBPDA) was used as ultrahigh density data
storage medium by scanning tunneling microscope (STM) technique. Data marks of 1.4nm in
diameter were written by applying voltage pulses between the STM tip and the substrate.
Structures of single crystal and thin films were characterized by IR, UV-Vis, XRD, STM and
verified by DFT quantum chemical calculation.