Plasmonic Diagnostics for Tribology: In Situ Observations Using Surface Plasmon Resonance in Combination with Surface-Enhanced Raman Spectroscopy

Brandon A. Krick, David W. Hahn, and W. Gregory Sawyer


The generation of transfer films is a common wear and lubrication mechanism of solid lubricants, such as polymers and lamellar solids. Material can transfer from a solid lubricant to a counter surface as early as the first cycle of sliding, initiating the formation of a transfer film, which can persist for the duration of sliding. Surface plasmon resonance (SPR) was used to monitor incipient molecular wear of a solid lubricant as performed here using a gold coated (50 nm) quartz prism in situ during sliding experiments. Surface-enhanced Raman spectroscopy (SERS) is a complementary technique enabling the analysis of ultra-thin transfer films. SPR and SERS experiments confirm that polytetrafluoroethylene and graphite transfer readily, with observed changes in SPR signal after one cycle of sliding, while ultra-high-molecular-weight polyethylene shows little transfer to the gold during sliding in the in situ SPR experiment. This shows the feasibility of SPR and SERS as important diagnostic tools for tribological studies.

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[pdf version] or DOI: 10.1007/s11249-012-0048-z


Undergraduate Research Positions Available

Research Opportunities

Oportunity for hands on research experience.

Now Accepting Applications.

In the Tribology Laboratory, undergraduates will do experimental research focused on interfacial interactions of condensed matter. This includes studying the fundamental origins of friction, wear, surface deformation and adhesion on complex surfaces and materials ranging from cells to nanocomposites in environments ranging space to kilometers under water.

Active research includes analysis of materials that recently returned from the international space station, evaluating wear of dinosaur dental fossils, developing and patenting ultra-low wear polymer nanocomposites, studying and designing biocompatible and bio-inspired polymeric and hydrogel materials, and collaborating internationally on the physics of soft matter interactions. This research in tribology is at the intersection of mechanical engineering, materials science and surface physics.

Nanomechanical and Tribological Properties on Hadrosaurid Dinosaurs

Nanomechanical and Tribological Properties on Hadrosaurid

Prof. Greg Sawyer, Greg Erickson and Brandon Krick measured nanomechanical and tribological properties on hadrosaurid (duck-billed dinosaur) dental fossils from the American Museum of Natural History. Using custom instruments, we measured tissue hardness and wear rates that were preserved in the 65 million year old tooth. These properties are preserved in fossilized teeth because apatite mineral content is the major determinant of dental tissue hardness. Measured tissue wear rates were used to simulate the formation of hadrosaurid tooth chewing surfaces using a 3-D wear simulation. The simulation results in a surface profile nearly identical to a naturally worn hadrosaurid dental battery. The model revealed how each tissue (of differing wear rates) contributed to the formation of sophisticated slicing and grinding features in these reptiles tens of millions of years before mammals evolved analogous chewing capacity. This capacity to measure wear-relevant properties preserved in fossils provides a new route to study biomechanics throughout evolution. See Journal papers:
Science, October 5, 2012, pp.98-101.

Experiments back from the International Space Station

Space Tribometers and Samples back for analysis

Materials on the International Space Station Experiments Space Tribometerd

Materials on the International Space Station Experiments (MISSE) Space Tribometers were the first ever active tribometers directly exposed to the Low Earth Orbit Environment

The Tribology Laboratory at Lehigh University is under construction

The lab as of May 2013

The lab as of July, 3rd 2013

The main laboratory is located in Lehigh's Packard Laboratory.