Abstracts Book - IMRC 2018

• SB6-P035
FUNCTIONALIZATION OF OPTICAL FIBER REDUCED BY CHEMICAL
ETCHING
Juan Sarid Domínguez 1 , Abdú Orduña 1 , Plácido Zaca 2 , Rafael Antonio Salinas Domínguez 1 , Juan
Pablo Padilla 2 , Valentín Lopéz 1
1 Centro de investigación en biotecnología aplicada, Instrumentación Analítica y Biosensores,
Mexico. 2 Benemerita Universidad Autonoma de Puebla, Instituto de Ciencias, Mexico.
The development of alternative technologies for the biosensing of certain
microorganisms is important in clinical diagnosis as well in food safety. The
present work reports the functionalization of reduced optical fibers by chemical
etching for the development of a biosensor based on evanescent wave
absorption, using a source of coherent infrared radiation. The reduced fibers
were elaborated by a chemical etching with hydrofluoric acid until leaving the
exposed core of approximately 8 μm in diameter. The experiment consisted in
passing a continuous wave source of a laser at 1550 nm through the reduced
fiber; subsequently, the fiber was subjected to a functionalization process,
consisting of a hydroxylation of the surface, a silanization with 3-
Aminopropyltrimethoxysilane. The experimental results show that the
functionalization process increases the diameter of the reduced fiber 100
nanometers, this measurement was made by scanning electron microscopy.
Additionally, the characterization of the output power and the reflected power
were obtained to obtain the refractive index and the evanescent wave depth,
which were found between 1251-1450 and 375 nm at 1379 nm, respectively. The
results obtained can be used for standardization of biofunctionalization
technique in the reduced optical fiber for development and study of
immobilization of biological recognition elements in construction of evanescent
wave biosensors.
Acknowledgment:
This work was supported by the CONACyT project No. 256513, and by the
Benemérita Universidad Autónoma de Puebla through the VIEP 00019 project.
Keywords: fiber optic, functionalization, biosensor
Presenting authors email: saridj_95@hotmail.com