A highly oriented hybrid microarray modified electrode fabricated by a template-free method for ultrasensitive...

Area of Science:

• Materials Science
• Nanotechnology
• Biosensors

Background:

• Fabricating highly oriented hybrid microarrays is challenging.
• Existing methods often require templates.
• Developing template-free approaches is crucial for advanced applications.

Purpose of the Study:

• To develop a facile, template-free method for creating highly oriented hybrid microarrays.
• To investigate the role of self-assembled monolayers (SAMs) in directing hybrid crystal growth.
• To construct a sensitive and selective DNA biosensor using the fabricated microarray.

Main Methods:

• Utilized a template-free approach on gold substrates.
• Employed self-assembled monolayers (SAMs) of 1,4-benzenedithiol for structure direction.
• Fabricated a microarray modified electrode.
• Constructed a label-free electrochemical DNA biosensor for H5N1 detection.

Main Results:

• Achieved highly oriented growth of hybrid microarrays.
• Demonstrated that SAMs provide interfacial structure-directing forces.
• Optimized microarray density by controlling surface coverage.
• Developed a DNA biosensor with a 5 pM detection limit for H5N1 and wide linear response.
• Exhibited excellent selectivity, regeneration, and stability.

Conclusions:

• The template-free method offers a new approach for oriented hybrid array fabrication.
• The developed microarray modified electrode shows promise for highly sensitive and selective biosensing.
• This work provides a new paradigm for constructing advanced biosensor platforms.