Concept for the Real-Time Monitoring of Molecular Configurations during Manipulation with a Scanning Probe Microscope

Area of Science:

• Nanofabrication
• Molecular assembly
• Scanning Probe Microscopy (SPM)

Background:

• Assembling functional molecular structures with SPM requires continuous configuration monitoring.
• Current SPM limitations prevent simultaneous manipulation and imaging for real-time feedback.
• This gap hinders precise control in nanoscale fabrication.

Purpose of the Study:

• To implement a novel method for real-time configuration monitoring during SPM manipulation.
• To overcome the limitations of simultaneous actuation and imaging in SPM.
• To enable precise, feedback-controlled assembly of molecular structures.

Main Methods:

• Modeling molecular manipulation as a partially observable Markov decision process (POMDP).
• Utilizing a particle filter to approximate molecular configuration in real time.
• Employing a precomputed finite-state automaton for POMDP models.
• Integrating atomistic simulations for enhanced model accuracy.

Main Results:

• Successfully demonstrated real-time configuration monitoring during SPM manipulation.
• Revealed underlying structural motifs from measured force gradients.
• Validated the feasibility of using non-imaging experimental data for feedback.

Conclusions:

• The developed methodology is a significant advancement for robotic and automated molecular assembly.
• Enables piece-by-piece construction of supramolecular structures with unprecedented precision.
• Paves the way for future automated nanofabrication processes.