Dernières publications
Discover how TERS surface information helps understanding the impact ignition mechanism of explosive nanoparticles. In this recent study, researchers from the French German Institute of St Louis and the Leibniz Institute of Photonic Technologyreports on how TERS mode with ֱ AFM-Raman reveals the crucial surface structure of these nanoscale co-crystals of two organic explosive compounds with opposite properties.
Gold-mediated exfoliation of MoS2 produces large area (cm size) high-quality crystals that are so much wanted for building nanodevices. 2010 Physics Nobel Prize Pr S. Novoselov from the University of Manchester and numerous collaborators from UK, CZ & US (including ֱ) published a beautiful study about the quality of interaction between MoS2 and gold using Raman and XPS. Thanks to TERS mapping with ֱ AFM-Raman system, they could relate nanoscale variations in specific vibrational and binding energy fingerprints to local substantial strain and charge doping in monolayer MoS2. These results pave the way for strain and charge doping nanoengineering of MoS2.
Sequencing of RNA by direct imaging would be a breakthrough not only in understanding and treating human diseases but also in elucidating phenomena involving living systems. In this short communication, Pr M.O. Scully from Texas A&M University et al bring the proof of concept of identifying the sequence of individual nucleobases of a single strand RNA deposited on a gold surface using ֱ AFM-TERS nanoimaging with an accuracy of 90%. To extract ID information from the low signal and high multiple peaks spectra the authors have developed a sophisticated analytical method based on a correlation function which estimates similarity with reference data.
Using Tip-Enhanced Photoluminescence (TEPL), Researchers from Columbia Engineering are first to demonstrate that sufficient strain in 2D material can yield single-photon emitters, key to quantum technologies and future photonic circuitry. The team was able to directly image these localized states for the first time, revealing that even at room temperature they are highly tunable and act as quantum emitters. TEPL has been performed with the AFM-Raman system from ֱ and the amazing results has been published recently in Nature Nanotechnology.
Remarkable demonstration of TERS as a powerful characterization tool for plasmonic nanostructures enabling a spatial visualization of the plasmonic resonances. Prof. P. El-Khoury from Pacific Northwest National Laboratory reports in a recent article TERS images of gold nanorods of varying lengths coated with 4-thiobenzonitrile: the spatial resolution achieved with TERS and its spatio-spectral capability allow the simultaneous observation of the quadripolar mode at low frequency shift of the molecule and tripolar mode at high frequency shift on a rod of a 240 nm length.
Matching Raman excitation laser, band gap of analyzed material and localized surface plasmon of substrate structure to reach ultimate TERS enhancement. That’s what I.A. Milekhin from the Technische Universität Chemnitz et al have achieved on monolayers CdSe nanocrystals deposited on gold nanodisks. Read it in a recent study published in Nanoscale Advances: Nanometer resolution TERS mapping with ֱ AFM-Raman system reveals that the CdSe phonon resonant response is strongly correlated with the local electromagnetic field distribution over the plasmonic structures (gold nanodisks and commercial SERS substrate (inverted pyramids covered by gold nanoclusters)).
Really promising! A rapid method to detect viral contamination of surfaces! Hurry and read this article from the team of Pr Dmitry Kurouski from Texas A&M University published in ACS Analytical Chemistry. Their approach is to combine two complementary label-free, non-invasive and non-destructive imaging techniques, AFM-IR and TERS. While AFM-IR gives information about both inner and outer parts of individuals virions of MS2 and HSV-1, TERS reveals the protein secondary structure and amino acid composition of the virus surfaces.
Plateforme optique AFM
AFM autonome avancée
AFM-Raman pour l'imagerie physique et chimique
AFM-Raman pour l'imagerie physique et chimique
AFM et microscopie à lumière inversée
Nanoscopie corrélative directe en temps réel
Couplage optique AFM polyvalent
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