Positron beam studies on polyaniline and Ag-coated polyaniline |
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Authors: | J.B.M. Krishna G. Amarendra C.S. Sundar B. Ghosh |
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Affiliation: | a UGC-DAE Consortium for Scientific Research, Kolkata 700 098, India b Materials Science Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, India c Jadavpur University, Kolkata 700 032, India |
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Abstract: | The effect of doping of the polyaniline emeraldine base (PEB), with Ni as well as Ni over layer coating has been investigated using variable low energy positron beam. Depth-resolved Doppler S-parameter measurements have been performed on undoped, Ni-doped polyaniline (PANI), and Ag (40 nm) film deposited PANI samples. Significant variation in S-parameter is observed for undoped and Ni-doped PANI. The size of the free volume hole has shifted to lower values upon doping with Ni as compared to that of undoped PANI, which is consistent with the conductivity measurements. For Ag-coated PANI systems, the S vs. Ep curves show distinct changes at the surface and interior regions. These results are discussed in the light of changes in free volume hole size distribution. |
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Keywords: | Polyaniline Positron annihilation |
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