Particle Deposition

Image: Nanostructures on surfaces

Caption: Using surface topography to control colloidal particle deposition, Image shows rows of particles and a color legend to depict height and depth of particles. As yet, there exists no powerful technique for chemical imaging under ambient conditions at the nanoscale. We are developing apertureless infrared near field spectroscopy to help fill that gap. Our current sensitivity permits us to image 24 bp DNA at submonolayer coverage, with a tunable IR source. We are developing alternative tunable IR sources for broader spectral coverage and greater sensitivity to macromolecular conformations at surfaces.

Source: Gilbert Walker, U. of Pittsburgh


NSF Funded: Yes

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