Design of Laser Photothermal Conversion Membranes Based on Fluorinated Graphene.

Junyu Piao,Yong Zhang,Long Zhang,Keding Li

doi:10.3390/membranes12020135

Junyu Piao, Yong Zhang + Show 2 more

Open Access

https://doi.org/10.3390/membranes12020135

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Abstract

Laser photothermal-conversion membranes have great potential applications in many different fields, including laser ignition. However, the demand for real-time, high heat output calls for an extra heat-releasing pattern other than the traditional luminous energy–thermal, energy-conversion mechanism. Herein, it was found that fluorinated graphene (FG) was a promising candidate for laser photothermal conversion due to the extra chemical energy–thermal, energy-conversion process, which originated from a self-redox reaction under laser irradiation. Moreover, an easy sonochemical, exfoliation–filtration protocol was provided for the preparation of the fluorinated, graphene-based, free-standing membranes. In brief, FG flakes were arranged into flower-like patterns and formed freestanding, carpet-like membranes with layered structures with the filtration of FG suspension, which was obtained from exfoliating fluorographite in N-methylpyrrolidone. Furthermore, this contribution also revealed that modifying the FG membranes with polytetrafluoroethylene (PTFE) was helpful for improving the photothermal-conversion properties. With the construction of the FG/PTFE composited structure, higher heat output could be achieved when a laser pulse is applied to the composite membranes. This work revealed the great potential of fluorinated graphene in laser photothermal conversion, and provided an alternative route of introducing a chemical energy–thermal, energy-conversion process for achieving high heat output under laser irradiation.

Highlights

Laser ignition, which usually refers to the combustion or explosion triggered by a short pulse of laser, has been used in a wide variety of applications, including internal combustion engines, pyrotechnics, and rocket motors [1,2,3]
We provide an easy preparation protocol of freestanding, twodimensional fluorinated graphene (FG) membranes
This work reveals the great potential of fluorinated graphene in laser photothermal conversion, and provides a new perspective for introducing the chemical energy–thermal, energy-conversion process for achieving high heat output under laser irradiation

Summary

Introduction

Laser ignition, which usually refers to the combustion or explosion triggered by a short pulse of laser, has been used in a wide variety of applications, including internal combustion engines, pyrotechnics, and rocket motors [1,2,3]. Most works about FG in the field of laser photothermal conversion only focused on the high near-infrared (NIR) absorption and the strong adsorption energy between energetic materials [26,27,28,29,30], and little work has been engaged in the characteristic self-redox properties of FG and the significance of introducing an additional heat-releasing process, other than photothermal conversion. In this contribution, we provide an easy preparation protocol of freestanding, twodimensional FG membranes. This work reveals the great potential of fluorinated graphene in laser photothermal conversion, and provides a new perspective for introducing the chemical energy–thermal, energy-conversion process for achieving high heat output under laser irradiation

Materials and Methods

Morphology and Composition

Mechanism Research