Resistive Sensors Based on Self-Assembled Core-Shell Nanoparticles

摘要

Au@Ag, Au@ZnO and Au@SnO_2 nanoparticles were synthetized and then assembled by Langmuir Blodgett technique. The resulting close-packed core-shell nanoparticle monolayers were transferred onto glass chips to fabricate NH_3 and H_2 resistive sensors. Sensing performances of the as-fabricated sensors were evaluated through the resistivity changes in the discontinuous particle assemble. The sensitivity of Au@Ag based sensor was tested towards NH_3 while Au@ZnO and Au@SnO_2 based sensors were tested under H_2. Assembles of core-shell nanoparticles organized by the Langmuir-Blodgett technique demonstrated attractive sensing performances towards the target gases in extended concentration ranges.