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Mesoporous silica coating on carbon nanotubes: layer-by-layer method.

Xiaoyong Deng¹, Ping Qin, Man Luo

¹Institute of Nanochemistry and Nanobiology, Shanghai University, Shanghai 200444, PR China.

Langmuir : the ACS Journal of Surfaces and Colloids

|May 16, 2013

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Researchers developed a versatile single-step method for mesoporous silica coating. This technique successfully coats carbon nanotubes (CNTs), expanding its applicability beyond cetyltrimethyl ammonium bromide (CTAB)-capped nanoparticles.

Area of Science:

Materials Science
Nanotechnology
Chemistry

Background:

Developing general and simple methods for mesoporous silica coating is highly desirable.
Hyeon's group previously reported a facile single-step method for coating iron oxide nanoparticles.
This method's applicability was limited to nanostructures heavily capped with cetyltrimethyl ammonium bromide (CTAB).

Purpose of the Study:

To investigate the feasibility of Hyeon's single-step coating method on nanostructures not capped by CTAB.
To adapt and expand the single-step mesoporous silica coating protocol for broader applications.
To demonstrate the successful silica coating of carbon nanotubes (CNTs) using an adapted method.

Main Methods:

Utilized an analogous layer-by-layer assembly method.

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Employed carbon nanotubes (CNTs) as a model system for coating.

Applied Hyeon's single-step silica coating procedure.

Main Results:

Successfully anchored a higher density of CTAB molecules onto CNTs.
Achieved uniform mesoporous silica shell formation on CNTs.
Demonstrated the efficacy of the adapted single-step method on non-CTAB-capped nanostructures.

Conclusions:

The adapted single-step method enables mesoporous silica coating on CNTs.
This work extends the general applicability of the single-step silica coating technique.
The findings pave the way for a generalized protocol for mesoporous silica coating.