|About this Abstract
|Materials Science & Technology 2020
|Nanotechnology for Energy, Environment, Electronics, Healthcare and Industry
|Pioneering Sensing Applications of Nanoporous Gold by Leveraging Unique Properties at the Nanoscale
|Timothy Wong, Roger Newman
|On-Site Speaker (Planned)
One of the barriers to the widespread application of nanomaterials is the challenges in fabrication. Nanoporous gold (NPG) is an exceptional material in this regard, with controllable, scalable, and simple fabrication being possible, utilizing electrochemical dealloying. A fixed electrochemical potential is applied to Au alloy, where the potential dissolves the less-noble component(s) of the alloy. As the Au rearranges on the surface, a nanoporous network is formed. In this work, we demonstrate a potential new application space for NPG, whereby environmental volatile compounds are monitored by changes in the complex electrical properties (resistance and capacitance) of NPG. This sensing is enabled by the high surface as well as electrochemical and nanoscale electron scattering phenomena. Recent advances in machine learning have also helped enable this sensing, due to the complex non-linearities observed in the sensing response.