title: Spectroscopic studies on sidewall carboxylic acid functionalization of multi-walled carbon nanotubes with valine.
abstract: The valine functionalized multi-walled carbon nanotubes (MWCNTS) were prepared and characterized by using XRD, UV-Vis, FT-IR, EPR, SEM, and EDX, spectroscopic techniques. The enhanced XRD peak (002) intensity was observed for valine functionalized MWCNTs compared with oxidized MWCNTs, which is likely due to sample purification by acid washing. UV-Vis study shows the formation of valine functionalized MWCNTs. FT-IR study confirms the presence of functional groups of oxidized MWCNTs and valine functionalized MWCNTs. The ESR line shape analysis indicates that the observed EPR line shape is a Gaussian line shape. The g-values indicate that the systems are isotropic in nature. The morphology study was carried out for oxidized MWCNTs and valine functionalized MWCNTs by using SEM. The EDX spectra revealed that the high purity of oxidized MWCNTs and valine functionalized MWCNTs. The functionalization has been chosen because, functionalization of CNTs with amino acids makes them soluble and biocompatible. Thus, they have potential applications in the field of biosensors and targeted drug delivery.
authors.affiliation: Department of Chemistry, NMSSVN College, Madurai 625 019, Tamil Nadu, India.
authors.forename: M
authors.initials: M
authors.lastname: Deborah
authors.affiliation: Department of Chemistry, NMSSVN College, Madurai 625 019, Tamil Nadu, India.
authors.forename: A
authors.initials: A
authors.lastname: Jawahar
authors.affiliation: Department of Physics, NMSSVN College, Madurai 625 019, Tamil Nadu, India.
authors.forename: T
authors.initials: T
authors.lastname: Mathavan
authors.affiliation: Department of Physics, NMSSVN College, Madurai 625 019, Tamil Nadu, India.
authors.forename: M Kumara
authors.initials: MK
authors.lastname: Dhas
authors.affiliation: Department of Physics, NMSSVN College, Madurai 625 019, Tamil Nadu, India. Electronic address: miltonfranklin@yahoo.com.
authors.forename: A Milton Franklin
authors.initials: AM
authors.lastname: Benial
mesh_terms: D002264:Carboxylic Acids / Q000737:chemistry*; D004577:Electron Probe Microanalysis; D004578:Electron Spin Resonance Spectroscopy; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000648:ultrastructure; D010084:Oxidation-Reduction; D013052:Spectrometry, X-Ray Emission; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared; D014633:Valine / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D002264:Carboxylic Acids; D037742:Nanotubes, Carbon; D014633:Valine
keywords: Characterization; Electron paramagnetic resonance; Functionalization; Multi-walled carbon nanotubes; Valine