Gold Nanorod Coating with Silica Shells Having Controlled Thickness and Oriented Porosity: Tailoring the Shells for Biosensing
نویسندگان
چکیده
The coating of gold nanorods with a silica shell (AuNR@SiO2) is an effective way to extend their use in wide variety biomedical applications including biosensing, drug delivery and photothermal therapy. A offers numerous advantages as it provides more stability, frees the surface from toxic cetyltrimethylammonium bromide (CTAB), preserves rod shape under conditions. This needs be very thin for such plasmonic while thicker porous suited encapsulation further controlled release. We introduce herein strategy perform based on dissociation tetraethylorthosilicate (TEOS) hydrolysis condensation reactions. achieved by pH modulation reaction medium, and, depending selected conditions, AuNR@SiO2 thick having organized mesoporosity aligned either parallel (AuNR@//m-SiO2) or perpendicular (AuNR@⊥m-SiO2) AuNR was generated. Moreover, when mercaptopropyltrimethoxysilane (MPTMS) used primer prior TEOS condensation, ultrathin homogeneous shells (AuNR@t-SiO2) controllable thickness range 2–6 nm were produced. While formation, at high concentration, core-free nanoparticles evidenced TEM analysis before purification procedure, total elimination during step addition suitable amount CTAB ensure colloidal stability core–shell nanoparticles. Complete demonstrated XPS, Raman, ζ-potential measurements. Finally, efficiency AuNR@t-SiO2 label-free biosensing model target refractive index sensitivity factor improved 30% compared CTAB-capped AuNRs.
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ژورنال
عنوان ژورنال: ACS Applied Nano Materials
سال: 2021
ISSN: ['2574-0970']
DOI: https://doi.org/10.1021/acsanm.1c02297