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Abstract |
By n-nonylamine (NA) intercalation into PbI_2, NA/PbI_2 composite materials were synthesized with the molar ratio, n, of NA for PbI_2 of 0~4. The energy gap was found to change from 2.43eV to 3.20eV b...y NA intercalation from the transmittance spectra. In particular, it increased rapidly at n = 0~1. It was also found from the X-ray diffraction measurement that NA's in the van der Waals gaps formed 2-layers for n≧1, and lay tilted at angles of 53.8° or 30.1° to the c-axis direction. The increase in the energy gap is thus supposed to be caused by the increase of the volume ratio of the 2-layers for the 0-layer.show more
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