Nanomolecular electronic devices based on AuNP molecule nanoelectrodes using molecular place-exchange process

Area of Science:

• Nanoscience and Nanotechnology
• Molecular Electronics
• Materials Science

Background:

• Fabricating molecular electronics devices is challenging due to difficulties in precisely positioning molecules between nanocontacts.
• Existing methods lack the control needed for specific electronic properties.

Purpose of the Study:

• To present a novel method for fabricating 20 nm sized nanomolecular electronic devices (nanoMoEDs).
• To demonstrate the use of a molecular place-exchange process for controlled molecule integration.
• To enable the application of molecules with specific electronic properties in nanoelectronic devices.

Main Methods:

• Development of a molecular place-exchange process.
• Utilizing nonconductive short alkyl thiolates and conductive oligomers.
• Fabrication of 20 nm sized nanoMoEDs.
• Verification using resistance measurements and surface-enhanced Raman spectroscopy.

Main Results:

• Successful place-exchange with short-chain conjugated oligomers in nanoMoEDs.
• Observed resistance changes of up to four orders of magnitude for 4,4'-biphenyldithiol (BPDT).
• Observed resistance changes of up to three orders of magnitude for oligo phenylene-ethynylene (OPE).
• Verified the place-exchange process through repetitive exchanges and spectroscopy.

Conclusions:

• The molecular place-exchange process is a viable method for fabricating nanoMoEDs.
• This technique allows for significant modulation of device resistance.
• Opens possibilities for fabricating nanoMoEDs with diverse molecules for various applications.