AFM-IR (Photo-induced force microscopy: a technique for hyperspectral nanochemical mapping)
| Dates: | 25 October 2017 |
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| Times: | 09:30 - 10:30 |
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| What is it: | Seminar |
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| Organiser: | Department of Materials |
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| How much: | Free |
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Infrared Photo-induced Force Microscopy (IR PiFM) is based on an atomic force microscopy (AFM) platform that is coupled to a widely tunable mid-IR laser. PiFM measures the dipole induced
at or near the surface of a sample by an excitation light source by detecting the dipole-dipole force that exists between the induced dipole in the sample and the mirror image dipole in the metallic
AFM tip. This interaction is strongly affected by the optical absorption spectrum of the sample, thereby providing a significant spectral contrast mechanism which can be used to differentiate
between chemical species. Due to its AFM heritage, PiFM acquires both the topography and spectral images concurrently and naturally provides information on the relationship between local
chemistry and topology with sub 10 nm spatial resolution on a variety of samples. PiFM spectral images surpass spectral images that are generated via other techniques such as scanning
transmission X-ray microscopy (based on synchrotron source), micro confocal Raman microscopy, and electron microscopes, both in spatial resolution and chemical specificity. The breadth of the
capabilities of PiFM will be highlighted by presenting data on various material systems (organics, inorganics, 1D/2D, bio-molecules, and nano-photonic materials). By enabling imaging at the
nm-scale with chemical specificity, PiFM provides a powerful new analytical method for deepening our understanding of nanomaterials and facilitating technological applications of such materials.
Biography
Dr. Park is the CEO of Molecular Vista, which he co-founded with Prof. Kumar Wickramasinghe (UC Irvine, formerly of IBM) in 2011 to provide research and industrial tools for rapid and nanoscale
imaging with chemical identification. He has more than 25 years of experience of industrial R&D, engineering, marketing and sales, and operations, having co-founded Park Scientific Instruments (PSI),
which was one of the first commercial companies to develop and sell scanning tunneling microscopes (STM) and atomic force microscopes (AFM). PSI was sold to Thermo Instruments 1997; by then,
it had sold upwards of 1,000 instruments to customers worldwide. Just prior to founding Molecular Vista, Dr. Park served as the General Manager of Park Systems, Inc. Prior to founding Park Scientific
Instruments, he worked as a post-doc at IBM Watson Research Center. He earned his Ph.D. in Applied Physics from Stanford University and BA in Physics from Pomona College.
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B19
The Mill
Manchester
