TY  - JOUR
A1  - Balderas-Valadez, Ruth Fabiola
A1  - Antunez, E. E.
A1  - Olive-Mendez, Sion Federico
A1  - Pacholski, Claudia
A1  - Campos-Alvarez, Jose
A1  - Bokhimi, Xim
A1  - Agarwal, V.
T1  - Porous silicon pillar and bilayer structure as a nucleation center for the formation of aligned vanadium pentoxide nanorods
JF  - Ceramics International
N2  - Porous silicon single layer (PSM), bilayer (PSB) and pillar (PSP) structures have been evaluated as nucleation centers for vanadium pentoxide (V2O5) crystals. Deposition of vanadium precursor over different substrates (drop casting technique), followed by annealing treatment under Ar-H-2 (5% H-2) atmosphere, induced crystallization of vanadium oxide. With respect to c-Si/SiO2 substrate, V2O5 nanorods with relatively large aspect ratio were formed over and within PSP structures. On the other hand, pores in PSM and PSB were found to be filled with relatively smaller crystals. Additionally, PSB provided a nucleation substrate capable to align the nanocrystals in a preferential orientation, while V2O5 crystals grown on PSP were found to be randomly aligned around the nanoporous pillar microstructure. Nanorods and nanocrystals were identified as V2O5 by temperature-controlled XRD measurements and evidence of their crystalline nature was observed via transmission electron microscopy. A careful analysis of electronic microscopy images allows the identification of the facets composing the ends of the crystals and its corresponding surface free energy has been evaluated employing the Wulff theorem. Such high surface area composite structures have potential applications as cathode material in Lithium-ion batteries.
KW  - Porous silicon
KW  - Vanadium pentoxide
KW  - Nanorods
KW  - Crystallization
KW  - Nanostructures
Y1  - 2017
U6  - https://doi.org/10.1016/j.ceramint.2017.03.114
SN  - 0272-8842
SN  - 1873-3956
VL  - 43
SP  - 8023
EP  - 8030
PB  - Elsevier
CY  - Oxford
ER  -