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Spatial and Bidirectional Work Function Modulation of Monolayer Graphene with Patterned Polymer "Fluorozwitterists".

James Nicolas Pagaduan¹, Nicholas Hight-Huf², Le Zhou¹

¹Polymer Science and Engineering Department, University of Massachusetts, Amherst, Massachusetts 01003, United States.

ACS Central Science

|September 2, 2024

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This summary is machine-generated.

Functional polymers called fluorozwitterists modify graphene's electronic properties. These materials enable precise control over graphene's work function, paving the way for advanced electronic devices.

Area of Science:

Materials Science
Surface Chemistry
Nanotechnology

Background:

Interfacial contact between soft and hard materials is crucial for advanced functional polymers and nanoscale structures.
Work function engineering of two-dimensional (2D) materials, like graphene, is key for high-performance electronic devices.
Functional polymers with zwitterionic and fluorocarbon groups offer unique electronic and surface properties.

Purpose of the Study:

To investigate the electronic impact of novel functional polymers, termed "fluorozwitterists," on the work function of monolayer graphene.
To explore the potential of these polymers in creating patterned structures for electronic applications.
To understand how zwitterionic and fluorinated components influence graphene's electronic behavior.

Main Methods:

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Preparation of negative-tone photoresists incorporating zwitterionic and fluorocarbon side chains.
Utilizing Kelvin probe force microscopy to measure changes in graphene's work function.
Employing photolithography to create patterned fluorozwitterist structures on graphene.

Main Results:

The fluorozwitterist polymers induced a p-doping effect on graphene, increasing its work function.
This contrasts with the typical work function decrease observed with other polymer-graphene contacts.
Spatial patterning of fluorozwitterists created lateral p-i-n diode-like configurations with localized work function modulation.

Conclusions:

The designed polymeric fluorozwitterist is effective for solution-based surface patterning of 2D materials.
This approach allows for spatial work function modulation, crucial for integrated electronic devices.
Fluorozwitterists offer a novel method for tuning the electronic properties of graphene and other 2D materials.