TY - JOUR
T1 - Fabrication of porous anodic alumina (PAA) templates with straight pores and with hierarchical structures through exponential voltage decrease technique
AU - Sacco, Leandro
AU - Florea, Ileana
AU - Cojocaru, Costel-Sorin
PY - 2019
Y1 - 2019
N2 - The present work aims to become a standard step for the fabrication of the next generation porous anodic alumina (PAA) templates based devices and to provide new insights on the mechanism involved in the porous anodic alumina formation. The oxide barrier layer at the bottom of the pores has been successfully thinned by applying an exponential voltage decrease process followed by a wet chemical etching. The impact of the potential drop on the PAA structure has been deeply investigated, as well as the electrolyte temperature, the number of potential steps and the exponential decay rate. The presented results underline that a smart adjustment between the anodization conditions and exponential voltage decay parameters can simultaneously give PAA structures with straight pores and remove the dielectric layer in spite of applying the exponential voltage decay step. Additionally, the PAA structure has been tuned to fabricate hierarchically nanoporous templates with secondary pores ranging from 2 up to 10 branches.
AB - The present work aims to become a standard step for the fabrication of the next generation porous anodic alumina (PAA) templates based devices and to provide new insights on the mechanism involved in the porous anodic alumina formation. The oxide barrier layer at the bottom of the pores has been successfully thinned by applying an exponential voltage decrease process followed by a wet chemical etching. The impact of the potential drop on the PAA structure has been deeply investigated, as well as the electrolyte temperature, the number of potential steps and the exponential decay rate. The presented results underline that a smart adjustment between the anodization conditions and exponential voltage decay parameters can simultaneously give PAA structures with straight pores and remove the dielectric layer in spite of applying the exponential voltage decay step. Additionally, the PAA structure has been tuned to fabricate hierarchically nanoporous templates with secondary pores ranging from 2 up to 10 branches.
KW - Barrier thinning layer
KW - Branches
KW - Electrodeposition
KW - Hierarchical nanostructures
KW - Oxide barrier layer
KW - Porous anodic alumina
UR - http://www.scopus.com/inward/record.url?scp=85062512676&partnerID=8YFLogxK
U2 - 10.1016/j.surfcoat.2019.02.086
DO - 10.1016/j.surfcoat.2019.02.086
M3 - Article
AN - SCOPUS:85062512676
SN - 0257-8972
VL - 364
SP - 248
EP - 255
JO - Surface and Coatings Technology
JF - Surface and Coatings Technology
ER -