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Characterization of Nanoparticles from Combustion Engine Emission using AFM-TERS

In the frame of the European PEMs4Nano project, nanoparticles from combustion engine emission have been deposited on gold substrates and imaged by AFM and its combined nano-resolution chemical TERS mode. Focus has been on sub-23 nm particles which are investigated for their health impact and are to be soon under regulation rules. Particles imaged by AFM are characterized by their size with a resolution of +/- 1 nm. Correlated TERS maps with a pixel size of 7 nm and below reveal the chemical complexity through the deconvoluted D and G band signatures. Using the D1 over (G+D2) band intensity ratio which is an indicator of the degree of order in soot structure, TERS is capable of distinguishing between combustion engine emitted nanoparticles of different structure.

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Characterization of Nanoparticles from Combustion Engine Emission using AFM-TERS

A new concern for human health is now raised by sub-23 nm particles emitted by on-road motor vehicles. Beyond measuring particle number and mass, it is also critical to determine the surface chemical composition of the nanoparticles to understand the potential reactivity with the environment.

Characterization of Nanoparticles from Combustion Engine Emission using AFM-TERS

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