DC transport in self-assembled 2D layers of Ag nanoparticles

The temperature dependence of the DC resistivity of silver quantum dot self -assembled 2D Langmuir monolayers was obtained. The films exhibit a metalli c-like resistance at high temperatures (above 200 K), and a thermally activ ated mechanism at intermediate temperatures (60-200 K) which strongly suppo rts the model of a Mott-Hubbard band gap. The transition temperature from t he metallic-like regime to the thermally activated regime was found to corr elate with the activation barrier.