The most common materials and morphologies observed in patent and journal documents are similar, except for the replacement of copper in journal documents with platinum in patent publications. Platinum is used as a catalyst in industry, can absorb and respond to gases, and is conductive. Despite its expense, the known properties, methods of handling, and gas response behavior of platinum may make it an effective material for sensors, particularly for gas and electrochemical sensors. While copper is prevalent in nanoclusters and nanoflowers, no single morphologies of nanoscale platinum predominate.