Patterning and tuning of electrical and optical properties of graphene by laser induced two-photon oxidation

TL;DR

This paper introduces a simple all-optical laser-induced two-photon oxidation technique to precisely pattern and tune the electrical and optical properties of graphene, enabling advanced electronic and optoelectronic device fabrication.

Contribution

It presents a novel, room-temperature, ambient-air method for controllably oxidizing graphene with laser pulses, allowing for customizable band gap creation and complex patterning.

Findings

Precise control of oxidation levels via laser intensity and pulse number.

Ability to pattern complex graphene structures in ambient air.

Enabling development of all-graphene electronic and optoelectronic devices.

Abstract

Graphene, being an ultrathin, durable, flexible, transparent material with superior conductivity and unusual optical properties, promises many novel applications in electronics, photonics and optoelectronics. For applications in electronics, patterning and modification of electrical properties is very desirable since pristine graphene has no band gap. Here we demonstrate a simple all-optical patterning method for graphene, based on laser induced two-photon oxidation. By tuning the intensity of irradiation and the number of pulses the level of oxidation can be controlled to high precision and, therefore, a band gap can be introduced and electrical and optical properties can be continuously tuned. Arbitrary complex patterning can be performed for air-suspended monolayer graphene or for graphene on substrates. The method works at room temperature in ambient air and no additional processing step is needed. The presented concept allows development of all-graphene electronic and optoelectronic devices and complex circuits with an all-optical method.