1. 1D ZnO nanorods for piezoelectric nanogenerators
4th International School and Conference "Saint-Petersburg OPEN 2017"
1D ZnO nanorods for piezoelectric nanogenerators
Semenova А.А., Lashkova N.А., Мaximov А.I., Моshnikov V.А., Kudryashov D.A.,
Mozharov A.M., Verbitsky V.N.
The purpose of the work: the formation of ZnO nanorods via low-temperature hydrothermal synthesis on seed layers obtained by spin-coating, magnetron sputtering and SILAR methods.
Hydrothermal synthesis: mole/l HМТА, mole/l Zn(NO3)2∙6H2O.
[Zn(OH)4]2⁻ ↔ ZnO + H2O + 2OH⁻
Zn2⁺ + 2OH⁻ ↔ Zn(OH)2
Zn(OH)2 ↔ ZnOSOLID + H2O
Zn2⁺ + OH⁻ ↔ [Zn(OH)]⁺
Zn2⁺ + 3OH⁻ ↔ [Zn(OH)3]⁻
Zn2⁺ + 4OH⁻ ↔ [Zn(OH)4]2⁻
Zn2⁺ + 2OH⁻ ↔ ZnO + H2O
ZnO nanorods with added L-Cys
Surfactants
Concentration
PVP
0.5 mg/100 ml
PEI
0.2 ml/100 ml
L-Cys
2.3 mg/100 ml
LSL Na
4.2 mg/100 ml
Spin-coating (SC): 5mM solution Zn(CH3COO)2 in C3H7OH.
Zn(CH3COO)2 + 4O2 ↔ ZnO + 4CO2 + 3H2O a b c
ZnO nanorods grown with addition: a - L-Cys in alkaline condition ; b –PVP; c –PEI
(in insertions: a - L-Cys; b – LSL Na)
AFM of ZnO SC seed layers:
the phase and the topography
Magnetron sputtering: ZnO and In2O3 (90%) SnO2 (10%) sintered targets, working gases: Ar2+O2. д a b c
ZnO nanorods grown on 10 nm seed layers with addition: a - L-Cys; b –PVP; c –LSL Na
(in insertions: nanorods grown on 30 nm seed layers)
SILAR: 0.1 mole ZnCl2, 5 ml NH4OH.
ZnSO4 + 2NaOH → Na2ZnO2 + H2SO4 (V)
Na2ZnO2 + H2O→ ZnO + 2NaOH
A.Raidou, M.Aggour, A.Qachaou et al. Preparation and Characterisation of ZnO Thin Films Deposited by SILAR Method // M.J.Condensed Matter. Vol.12. №2.2010
AFM of SILAR ZnO
seed layers: the phase
and the topography
ZnO nanorods grown with addition L-Cys
Conclusion: Arrays of ZnO nanorods were formed on the sublayers obtained by spin-coating, SILAR and magnetron sputtering methods. Spin-coating and magnetron sputtering methods allow obtaining thin films with high homogeneity of the crystallites. The optimal concentrations for the formation of ZnO nanorods with an aspect ratio X= were defined.