The assembly of individual components into nanostructures has a wide range of applications from catalysts to sensors. The Robertson lab explores the assembly of gold nanoparticles with peptoid polymers, which have potential applications as plasmonic sensors. These materials are formed by the coassembly of peptoids and nanoparticles into monolayers on fluid surfaces, followed by compression and collapse into a sheet-like structure such that the nanoparticles are stuck between the peptoid monolayers. Pollutants can then get caught between the nanoparticles and detected. These nanosheets form by placing peptoid solutions on a fluid surface and adding nanoparticles to the lipophobic side of the peptoid monolayer. My research aimed to determine the effect the nanoparticles had on the compression and collapse of these sheets. This was done by varying the volume of nanoparticles as well as using two different-sized ligands on the nanoparticles. By performing Langmuir trough collapse experiments I was able to generate isotherms to determine collapse points and surface pressure peaks. We found that nanoparticles with smaller ligands, such as decanethiol (DT), have both a higher surface pressure peak and an earlier collapse point compared to the nanoparticles with larger ligands, such as dodecanethiol (DDT). These results report the best conditions for creating gold nanoparticle sheets to be used as plasmonic sensors.