Nanowires and Nanoribbons Formed by Methylphosphonic Acid

Abstract

The production and physical properties of nanowires and nanoribbons formed by methylphosphonic acid (MPA)-CH 3 PO(OH) 2 -were investigated. These structures are formed on an aluminum coated substrate when immersed in an ethanolic solution of MPA for several days. A careful investigation of the growth conditions resulted in a narrow window of solution concentrations and temperatures for the successful development of nanowires and nanoribbons. Several different techniques were employed to characterize these nanostructures: (1) Photoluminescence experiments showed a strong emission at 2.3 eV (green), which is visible to the naked eye; (2) X-ray diffraction experiments indicated a significant cristalinity, in agreement with atomic force microscopy (AFM) and transmission electron microscopy (TEM) morphology images, which show organized nano-scale wires and ribbons, (furthermore, AFM-Phase and TEM images also suggest that nanoribbons are formed by well-aligned nanowires); (3) Conductive-AFM experiments revealed an intermediary conductivity for these structures (10 −1 /Ohm · m), which is similar to some intrinsic semiconductors and; (4) finally, Infrared, Raman, and X-Ray Photoelectron Spectroscopies produced information about the contents, structure, and composition of both wires and ribbons.

Facile Template-Free Fabrication of Aluminum-Organophosphorus Hybrid Nanorods: Formation Mechanism and Enhanced Luminescence Property

“…Further indications of the structure were provided by Raman spectroscopy (Figure b). Several new bands appeared in the range of 1000–1400 cm –1 , assignable to the vibrations of the C–C skeleton, P–C skeleton, and the PO 2 unit . Furthermore, the asymmetric and symmetric P–O vibration bands of O–P–O located near 800 cm –1 and an intense Al–O–P band at 617 cm –1 were observed, , suggesting the formation of Al–O–P–O–Al repeating units .…”

“…Several new bands appeared in the range of 1000−1400 cm −1 , assignable to the vibrations of the C−C skeleton, P−C skeleton, and the PO 2 unit. 41 Furthermore, the asymmetric and symmetric P−O vibration bands of O−P−O located near 800 cm −1 and an intense Al−O−P band at 617 cm −1 were observed, 42,43 suggesting the formation of Al−O−P−O−Al repeating units. 44 These analyses from FT-IR and Raman spectrum revealed the existence of bidentate PO 2 structure in APHNRs.…”