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(A) FT-IR spectra of nanotubes composed of TEOS and each hybrid silica post acid etching. Identifying peaks enlarged to the right indicating presence of the functional peaks post etching: (B) carbonyl stretch of AcPTES; (C) alkyl stretch of BTMH; (D) cyano stretch of CETES; (E) peaks indicative of reacted ICPTES; (F) C=N stretch of NTPDI; (G) amide stretches of PEO.
