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Nanomaterials 2018, 8(6), 362; https://doi.org/10.3390/nano8060362

Effect of Ethanol on Ag@Mesoporous Silica Formation by In Situ Modified Stöber Method

Department of Chemistry and Materials Science, School of Chemical Engineering, Aalto University, 02150 Espoo, Finland
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Received: 9 May 2018 / Revised: 22 May 2018 / Accepted: 22 May 2018 / Published: 24 May 2018
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Abstract

Tunable core-shell Ag@Mesoporous SiO2 spheres were synthesized via an in situ modified Stöber approach by varying the amount of ethanol (EtOH) expanding their potentials in many applications. Mesoporous silica was generated by adding tetraethyl orthosilicate (TEOS) to the mixture of colloidal Ag particles prepared by reducing silver nitrate (AgNO3) with L-ascorbic acid and using hexadecyltrimethylammonium bromide (CTAB) as a template at the presence of ethanol and sodium hydroxide (NaOH) at pH 10 as a catalyst. The average sizes of the Ag cores at the three increasing volumes of ethanol were ~47 ± 6, 36 ± 4, and 11 ± 5 nm, while the silica particle size and the thickness of the silica shells increased, resulting in a blueshift of localized surface plasmon resonances (LSPR) of the Ag NPs. The corresponding specific surface areas of silica particles were 356 ± 10, 419 ± 20 and 490 ± 25 m2 g−1, and average pore diameters varied from 5.7, 5.0 to 3.3 nm according to BET and BJH analyses. TEM studies confirmed the core-shell structure, pore sizes and shapes of mesoporous shells. The dissolution tests demonstrated that the release of Ag from the powder samples is pH-sensitive and time-dependent. View Full-Text
Keywords: core-shell; silver nanoparticles; silica mesoporous shell; ethanol effect core-shell; silver nanoparticles; silica mesoporous shell; ethanol effect
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Chen, Q.; Ge, Y.; Granbohm, H.; Hannula, S.-P. Effect of Ethanol on Ag@Mesoporous Silica Formation by In Situ Modified Stöber Method. Nanomaterials 2018, 8, 362.

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