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In this study nanoscale structure and associated energy dissipation behaviorof nanoparticulates of tungsten disulphide (WS2) and nanoparticles of gold (Au)were investigated by advanced scanning probe and electron microscopytechniques. WS2 nanoparticulates were deposited on silicon substrate by van derWaals adhesion transfer-deposition mechanisms. The templates of three sizevariants of Au nanoparticles, close packed (4-6nm), well dispersed (120-150nm)and clusters of (120-150 nm) nanoparticles were prepared on silicon substrates.Nano-microstructure, morphology, topography and phase shift of both WS2 and Aunanoparticles and nanoparticulates were characterized by Atomic ForceMicroscopy (AFM), Scanning Electron Microscopy (SEM) and Transmission ElectronMicroscopy (TEM). SEM and TEM observations showed that the nanoparticulates ofWS2 are atomically oriented lamellar-hexagonal structure or inorganic graphitelike structure. In the tapping mode AFM imaging, repeated scanning ofnanoparticulates of WS2 resulted in inter layer movement of nanolayers. It wasobserved that cluster of Au nanoparticles caused more phase shift and highenergy dissipation compared to that of well dispersed Au nanoparticles, howeverclose packed Au nanoparticles caused lowest phase shift and energy dissipation.Nano-microstructure, morphology, topography and phase shift were analyzed bySXM software. The nanoscale studies showed that the phase shift and the energydissipation were influenced by the geometrical and mechanical gradient of thesamples.

Nanoscale Structure and Energy Dissipation Behaviour of Tungsten  Disulphide and Gold Nanoparticles and Nanoclusters Investigated by Advanced  Microscopy Techniques