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Extreme density of power dissipation in modern electronics nanoscale devices needs suitable methods for exploring heat generation and management. We have developed a suite of Scanning Thermal Microscopy (SThM) based approaches using HV environment and novel probes and achieved spatial resolution to thermal conductibvity exeeding 50 nm. That allowed us to explore thermal transport in carbon nanotubes, graphene materials and other solid state devices (picture - SThM setup developed in our group for imaging graphene layers, in collaboration with M. Pumarol, Lancaster University, UK and M. Rosamond, M. Petty and D. Zeze, Durham University, UK)... By merging ultimate nanoscale resolution of scanning probe microscopy and the ability of acoustic imaging to observe subsurface structures, we are able to observe solid-state subsurface nanostructures in their undisturbed environment with a lateral resolution down to 5 nm. Starting with our original work on imaging dislocations under graphite..