Laser induced forward transfer of graphene and other 2D materials and computational modelling of transfer enabling conditions (Conference Presentation) (Withdrawal Notice) (original) (raw)

Laser-induced backward transfer of monolayer graphene

Applied Surface Science, 2020

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Printing of Crumpled CVD Graphene via Blister-Based Laser-Induced Forward Transfer

Nanomaterials

The patterning and transfer of a two-dimensional graphene film without damaging its original structure is an urgent and difficult task. For this purpose, we propose the use of the blister-based laser-induced forward transfer (BB-LIFT), which has proven itself in the transfer of such delicate materials. The ease of implementation of laser techniques reduces the number of intermediate manipulations with a graphene film, increasing its safety. The work demonstrates the promise of BB-LIFT of single-layer graphene from a metal surface to a SiO2/Si substrate. The effect of the parameters of this method on the structure of transferred graphene islands is investigated. The relevance of reducing the distance between irradiating and receiving substrates for the transfer of free-lying graphene is demonstrated. The reasons for the damage to the integrity of the carbon film observed in the experiments are discussed. The preservation of the original crystal structure of transferred graphene is co...

Facile one-step transfer process of graphene

Nanotechnology, 2011

Chemical vapour deposition (CVD) is emerging as a popular method for growing large-area graphene on metal substrates. For transferring graphene to other substrates the technique generally used involves deposition of a polymer support with subsequent etching of the metal substrate. Here we report a simpler one-step transfer process. Few-layer graphene (FLG) grown on a Cu substrate were transferred to a silanized wafer by just pressing them together. Hydrogen bonding between the hydroxyl group on FLG and the amine group on silane molecules facilitate the transfer.

Laser-induced effects on single layer graphene

2014

In this work we employ micro-Raman spectroscopy and Atomic Force Microscopy to reveal the laser-induced effects on mechanically exfoliated single-layer graphene on Si/SiO2 substrate. We irradiated our graphene samples for about 10 minutes in an ambient conditions by using a Nd:YAG visible laser with 532 nm wavelength and maximal power Plaser ranging from 32 mW to 40 mW. Our experimental results show a clear evidence that several events take place as a consequence of exposure of monolayer graphene to the high power laser. One of those events is the chemical functionalization of the graphene crystal lattice, generated by photo-induced chemical reactions presumably involving surrounding oxygen and water molecules trapped between Si/SiO2 substrate and graphene. Secondly, the dissociation of adhesive residues present on the graphene surface, as a result of laser-induced heating, leads to the generation of amorphous carbon and hydrogenation of graphene. A third event is the structural mod...

A direct transfer process for laser-induced graphene sensors on any substrate

2022 IEEE International Conference on Flexible and Printable Sensors and Systems (FLEPS)

Within this work we demonstrate a versatile approach for the creation of laser-induced graphene sensors by a direct transfer process onto virtually any kind of substrate. The process is based on preconditioning the substrate with a layer of polyimide sealing resin and subsequently laser scribing the sensor structure onto it. By tuning the resin thickness and laser parameters, the resin is entirely removed and the resulting LIG is firmly embedded on top of the substrate. The measurement results show a gauge factor of 0.51 %.

One-way transport in laser-illuminated bilayer graphene: A Floquet isolator

2017

We explore the Floquet band-structure and electronic transport in laser-illuminated bilayer graphene. By using a bias voltage perpendicular to the graphene bilayer we show how to get one-way charge and valley transport among two unbiased leads. In contrast to quantum pumping, our proposal uses a different mechanism based on generating a non-reciprocal bandstructure with a built-in directionality. The Floquet states at one edge of a graphene layer become hybridized with the continuum on the other layer, and so the resulting bandstructure allows for one-way transport as in an isolator. Our proof-of-concept may serve as a building block for devices exploiting one-way states.

Laser induced forward transfer of soft materials

Journal of Optics, 2010

A strong research effort is presently aimed at patterning methodologies for obtaining controlled defined micrometric polymeric structures for a wide range of applications, including electronics, optoelectronics, sensors, medicine etc. Lasers have been identified as appropriate tools for processing of different materials, such as ceramics and metals, but also for soft, easily damageable materials (biological compounds and polymers). In this work we study the dynamics of laser induced forward transfer (LIFT) with a gap between the donor and the receiver substrates, which is the basis for possible applications that require multilayer depositions with high spatial resolution.