In recent works it has been demonstrated the suitability of using resonant nanopillars (R-NPs) as biochemical. In this work it has been shown the capability of the R-NPs to behave as label-free multiplexed biological sensors. Each R-NP is formed by silicon oxide (SiO2) and silicon nitride (Si3N4) Bragg reflectors and a central cavity of SiO2, and they are grouped into eight arrays called BICELLs, which are distributed on a single chip of quartz substrate for multiplexing measurements. For the biological sensing assessment it was developed an immunoassay on the eight single BICELLs. The biofunctionalization process was performed by a silanization protocol based on 3-aminopropyltrymethoxysilane (APTMS) and glutaradheyde (GA) as a linker between APTMS and the IgG which acted as biorreceptor for the anti-IgG recognition. In this work, there were compared two forms of immobilization: on one hand by incubating the R-NPs under static drop of 50 μg/mL and on the second hand by introducing the sensing chip in a flow cell with a continuous flow of the same concentration of IgG. The eight arrays of R-NPs or BICELLs were independently optically interrogated by a bundle of fiber connected to a spectrometer. The multiplexing analysis showed reproducibility among the BICELLs, suggesting the potentially of using R-NPs for multiplexed biosensors. Performance in the immobilization process apparently does not have a signification effect. However the election of one method or another should be a commitment between time and resources.
Ana López-Hernandez, Rafael Casquel, Miguel Holgado , Iñaki Cornago, Fátima Fernández, Paula Ciaurriz, Francisco J. Sanza, Beatriz Santamaría, Maria V. Maigler, and María Fe Laguna, "Resonant nanopillars as label-free optical biosensors," Proc. SPIE 10488, Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications XVIII, 1048814 (Presented at SPIE BiOS: January 29, 2018; Published: 14 February 2018); https://doi.org/10.1117/12.2288273.
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Study of self-shadowing effect as a simple means to realize nanostructured thin films and layers with special attentions to birefringent obliquely deposited thin films and photo-luminescent porous silicon