Comparison of the refractive index changes of nanolayers of amidated and carboxylated carbon nanotubes after adsorption of water and ammonia molecules

doi:10.18721/JPM.183.101

Comparison of the refractive index changes of nanolayers of amidated and carboxylated carbon nanotubes after adsorption of water and ammonia molecules

Condensed matter physics

Authors:

Romashkin A.V. Rozanov R.Yu. Vishnevskiy A.S. Mitrofanova A.E. Stebelkov A.N. Nepomilueva V.V. Levin D.D. Svetikov V.V. Nevolin V.K.

Abstract:

Spray-deposited layers of amidated carbon nanotubes (ACNTs) were characterized using AFM, Raman scattering, and spectroscopic ellipsometry. The layer thickness, diameters, and band gap of ACNTs, as well as the changes in the refractive index (n) at 1319 nm and 1625 nm after H₂O and NH₃ adsorption in air and H₂O in N₂ were analyzed in comparison with carboxylated CNTs. Modeling the resonance peak shift due to changes in n for the ACNT-coated Si waveguide microring resonator after NH₃ adsorption allows us to propose the use of such a CNT layer set for integrated optical sensors for gas recognition tasks.