This item is available under a Creative Commons License for non-commercial use only
Electrochemistry, Colloid chemistry, Analytical chemistry
Silver nanoparticles were synthesised by a chemical reduction process in order to produce an aqueous colloidal dispersion. The resulting colloids were then characterised by a combination of UV-Vis spectroscopy, dynamic light scattering, X-ray diffraction and transmission electron microscopy and the nanoparticles were found to have an average diameter of 20–22 nm. The Ag/polymer nanocomposites were then applied to platinum interdigital electrodes as sensor coatings and the capability of the resulting sensor as a humidity detector investigated. With the application of 1 V, a current developed which was found to be directly proportional to humidity levels. The sensor gives a reversible, selective and rapid response which is proportional to levels of humidity within the range of 10% RH to 60% RH. An investigation into the mechanism of the sensor’s response was conducted and the response was found to correlate well with a second order Langmuir adsorption model.
Power, A., Betts, A, Cassidy, J.:Silver Nanoparticle Polymer Composite Based Humidity Sensor. Analyst, 2010, 135, pp.1645 - 1652