Nanowires and nanoribbons formed by methylphosphonic acid.
The production and physical properties of nanowires and nanoribbons formed by methylphosphonic acid (MPA)--CH3PO(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 x 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.
Archanjo
B S
BS
Departamento de Fisica, Universidade Federal de Minas Gerais, UFMG Ave. Antonio Carlos, 6627, Belo Horizonte, MG, Brazil.
Carvalho
L A S
LA
Rassa
M
M
Miquita
D R
DR
de Oliveira
F A C
FA
Cançado
L G
LG
Agero
U
U
Plentz
F
F
Cury
L A
LA
Gonzalez
J C
JC
Moreira
R L
RL
Paniago
R
R
Magalhães-Paniago
R
R
Neves
B R A
BR
D000042:Absorption; D000535:Aluminum / Q000737:chemistry; D008027:Light; D018625:Microscopy, Atomic Force; D046529:Microscopy, Electron, Transmission; D053758:Nanoparticles / Q000737:chemistry*; D036103:Nanotechnology / Q000379:methods; D037742:Nanotubes, Carbon / Q000737:chemistry*; D053770:Nanowires / Q000737:chemistry*; D009943:Organophosphorus Compounds / Q000737:chemistry*; D013055:Spectrophotometry, Infrared / Q000379:methods; D013059:Spectrum Analysis, Raman / Q000379:methods; D013696:Temperature; D014961:X-Ray Diffraction
D037742:Nanotubes, Carbon; D009943:Organophosphorus Compounds; C032627:methylphosphonic acid; D000535:Aluminum