Tapping AFM-IR+
best resolution among AFM-IR methods works for thick & thin samples excellent surface sensitivity tapping mode (noninvasive)
PTE+ (resonance-enhanced PTE)
enhanced sensitivity compared to PTE works for thick & thin samples nanoscale resolution for thin samples
resolution depends on thickness & morphology contact mode (tip & sample damage)
PTE (classic Photo-Thermal Expansion)
simple setup without laser-feedback cost efficient (lowest price/wavenumber) insensitive to bond orientation poor spatial resolution works for thick samples only contact mode (tip & sample damage)