Size-controlled electrochemical synthesis and properties of SnO2 nanotubes.
SnO(2) nanotubes with controlled diameter and length were synthesized using an electrochemical method at room temperature. The length and wall thickness of the nanotubes increased monotonically with the deposition time and the diameter of the nanotubes was altered by varying the pore size of the scaffolds. Post-annealing at 400 degrees C in dry air significantly improved the crystallinity while maintaining the nanotube structure. The temperature-dependent photoluminescence spectra indicated an activation energy of 58 meV for emission centered at 410 nm. The temperature-dependent electrical resistance revealed that the dominant electrical conduction mechanism alters from the ionization of the main donor centers to impurity scattering as the temperature decreases. The electrical conductance of 200 nm diameter nanotubes increased to 33 times the original value upon UV illumination at 254 nm.
Lai
Min
M
School of Mathematics and Physics, Nanjing University of Information Science and Technology, Nanjing, 210044, People's Republic of China.
Lim
Jae-Hong
JH
Mubeen
Syed
S
Rheem
Youngwoo
Y
Mulchandani
Ashok
A
Deshusses
Marc A
MA
Myung
Nosang V
NV
D003460:Crystallization / Q000379:methods*; D004595:Electroplating / Q000379:methods*; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008968:Molecular Conformation; D036103:Nanotechnology / Q000379:methods*; D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D013499:Surface Properties; D017971:Tin Compounds / Q000737:chemistry*
D046911:Macromolecular Substances; D017971:Tin Compounds; C045358:stannic oxide