Fri, 12 Oct|
Lecture Theatre S11, 16 Rainforest Walk
ECR Seminar / Webinar - By Mr Ted Ahn
NanoIR3 and mIRage: A New Generation of Photothermal Infrared Spectroscopy for a Nanoscale Material Characterization
Time & Location
12 Oct 2018, 2:00 pm – 3:00 pm
Lecture Theatre S11, 16 Rainforest Walk, Monash University, Clayton VIC 3800, Australia
About The Event
Infrared (IR) spectroscopy is a powerful analysis technique for the identification of chemical species based on characteristic absorption of infrared light associated with molecular functional groups. However, the spatial resolution of traditional IR spectroscopy is limited to ~5 μm due to the wavelength of infrared light. In addition, traditional absorption or transmittance experiments are not well suited to materials containing a high percentage of water.
In order to overcome the spatial resolution issue, a new method of generating an infrared spectrum is developed. The sample is exposed to an infrared laser scanned over the wavelengths of interest and the thermal expansion of the material is measured. Two instruments have been commercialized using either an atomic force microscopy (AFM-IR) or a green laser light (mIRage), to measure the thermal expansion.
AFM-IR can simultaneously detect an infrared signal with a high spatial resolution (as small as 10 nm) coupled with surface topographical and force information. The mIRage microscope has a larger maximum resolution (< 1 um) but provides much faster data acquisition and removes the requirement to successfully track the surface with an AFM tip. In this talk, the physical principles and basic operation of the AFM-IR and mIRage will be explained. Examples of polymeric and biological materials will be presented to showcase the capabilities of both instruments.