AFM oscillating sensor method Chemical engineering CpG-ODN NIR-II emission NIR-II fluorescence imaging NIR-II fluorescent probes Raman SERS T cells Technology: general issues activatable strategy aggregation-induced emission aptamers atomic force microscopy biomarker biosensing cancer cancer treatment circulating tumor cells computational analysis dendrimers drug delivery ferritin fluorescent-magnetic nanoparticles folic acid gold nanoparticles identification immunoassays immunotherapy inorganic nanoparticles