K W Hipps - Persistent Conductivity in TPyP:TSPP Organic Nanorods Induced by Ion Bombardment

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      Publication Details (including relevant citation   information):

      van Zijll, Marshall, Borders, Bryan, Mazur, Ursula, Hipps, K. W.   The Journal of Physical Chemistry C  2016 120 (27) 14962-14968

      Abstract: Persistent conductivity is observed   following Ar+ bombardment of   meso-tetra(4-pyridyl)porphyrin:meso-tetra(4-sulfonatophenyl)porphyrin   (TPyP:TSPP) nanorods. The lifetime of the persistent conductivity   in ultrahigh vacuum (UHV) is exceptionally long at room   temperature, between 106 and 107 s. Ion beam currents can be used   to both increase and decrease the level of persistent   conductivity in these nanorods. Initial Ar+ bombardment of a   sample causes an increase in the persistent current. Subsequent   bombardment with low-energy Ar+ can cause a rapid decrease in the   persistent current. A model is presented which presumes that   persistent conductivity is carried by metastable defects with   rates of excitation and relaxation following the Arrhenius   relationship. Energy conservation suggests that ion bombardment   introduces a thermal gradient across the nanorod which quickly   quenches when ion bombardment ceases. This quick quenching   results in a population of metastable defects which decay very   slowly at room temperature.

      Address (URL): http://dx.doi.org/10.1021/acs.jpcc.6b04689