StyreneBeads hard_disk Titanate IISCBangalore lithography Grain SoftSample Vinylpyridine dielectric trench ContactMode Array temp ConductiveAFM Reading CrAu 2dMaterials Morphology PVAC Zhi HardDisk FloppyDisk cannabidiol LeakageCurrent Piranha Nanostructure fe_nd_b TriGlycineSulphate hydrocarbon Carbon Flake Conductive AFM MfmAmplitude BiasMode BiVO4 TipBiasMode