Abstracts Book - IMRC 2018

• SA6-P021
SYNTHESIS OF SILICON NANOPORES AND THEIR STRUCTURAL
AND ELECTRONIC PROPERTIES USED IN ULTRA FAST DNA
SENSING
Itzel Santizo 1 , Maximiliano S. Pérez 1 , Ignacio L. Garzon 2 , Carlos Lasorsa 1
1 Universidad Tecnológica Nacional, Ingeniería de Recubrimientos Especiales y
Nanoestructuras, Argentina. 2 Instituto de Física - Universidad Nacional Autónoma de México,
Sistemas Complejos, Mexico.
Sets of micropores and nanopores were fabricated on monocrystalline silicon
wafers, they had been synthesized by electrochemical wet etching, a low cost
technique operating on nanofluidics channels of HCl and HCOOH, these acids
allowed to control the size of the pores. The temperature used was 84 º C,
operation voltages were 0.1 V, 0.5 V and 1 V, the combination of 84 º C and 1V,
showed more efficiency conducting the formation of the pores, the
characterization of the pore sizes as a function of time, was explained with a
simple model that showed the fabrication process permits scaling. The pores
were visualized at TEM and AFM. We also investigated the structural and
electronic properties of a realistic fractal Koch snowflake 2 nm silicon nanopore,
using the quantum mechanical DFT theory. This is important, since the low cost
experiments used to fabricate the nanopores belong to the stochastic
nanofluidics phenomena and is a general trend that stochastic processes in
nature, generate fractal geometries. Moreover, DNA sensing requires the
precise knowledge of the geometrical properties of the nanopores and the Kock
snowflake nanopore was a simple fractal geometry easy to study. The electronic
density of states was predicted for Koch snowflake nanopores corresponding to
Si344 and Si344H207, the formation of the last nanostructure is realistic due to the
deprotonation of the acids (H + ).
Acknowledgment: The authors thank the financial support CONICET-YPF (PIO-
2014), ANPCyT (PICT2012-575 / PICT2013-0840), and FAN 2014, Argentina. We
would like to thank Milena Vega for general support and discussion. Special
thanks to Ignacio Garzón, for his constructive criticism, that allowed to give
solidity and robustness to this paper.
Keywords: Nanopores, DNA, DFT
Presenting authors email: itzelsantizo@gmail.com