Interfacial-Assembled Bubble-Driven Asymmetric Nanomotors for Velocity-Signaled Immunoassay

Area of Science:

• Materials Science
• Nanotechnology
• Chemical Engineering

Background:

• Micro/nanomotors (MNMs) are gaining interest for energy conversion.
• Existing MNMs have limitations in preparation and adaptability.
• Asymmetric nanostructures offer unique properties for controlled motion.

Purpose of the Study:

• To synthesize a novel asymmetric nanomotor (MSP) with enhanced catalytic activity.
• To investigate the autonomous movement mechanism of the MSP nanomotor.
• To develop a portable immunosensor for aflatoxin B1 detection using MSP nanomotors.

Main Methods:

• Selective interface assembly for synthesizing NH2-Fe-MIL-88B@SiO2@Pt (MSP) nanomotors.
• Utilizing catalase-like activity of MSP for oxygen bubble generation and propulsion.
• Finite element analysis (FEA) to simulate oxygen concentration gradients.
• Constructing a 3D-printed device for smartphone-based detection.

Main Results:

• Successful synthesis of asymmetric MSP nanomotors.
• Demonstrated efficient autonomous movement driven by H2O2 decomposition.
• FEA confirmed asymmetric oxygen gradients driving stable motion.
• Developed a portable immunosensor for aflatoxin B1 detection with high sensitivity.

Conclusions:

• The MSP nanomotor offers a novel platform for controlled autonomous movement.
• The developed immunosensor provides a miniaturized and portable solution for aflatoxin B1 detection.
• This work advances nanomotor fabrication and point-of-care testing technologies.