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Posted: May 15, 2017
Gas gives laser-induced graphene super properties (w/video)
(Nanowerk News) Rice University scientists who invented laser-induced graphene (LIG) for applications like supercapacitors have now figured out a way to make the spongy graphene either superhydrophobic or superhydrophilic.
And it’s a gas.
Water rolls off a superhydrophilic laser-induced graphene pattern placed inside a superhydrophobic LIG frame. (Video: Tour Group
Until recently, the Rice lab of James Tour made LIG only in open air, using a laser to burn part of the way through a flexible polyimide sheet to get interconnected flakes of graphene. But putting the polymer in a closed environment with various gases changed the product’s properties.
Forming LIG in argon or hydrogen makes it superhydrophobic, or water-avoiding, a property highly valued for separating water from oil or de-icing surfaces. Forming it in oxygen or air makes it superhydrophilic, or water-attracting, and that makes it highly soluble.
Laser-induced graphene created in the presence of argon gas is superhydrophobic, meaning it avoids water. The process developed at Rice University makes materials that can be superhydrophilic or superhydrophobic from inexpensive materials and in one step. (Image: Tour Group)
“Labs could make graphene either hydrophobic or hydrophilic before, but it involved multiple steps of either wet-chemical or chemical vapor deposition processes,” Tour said. “We’re doing this in one step with relatively cheap materials in a homemade atmosphere chamber.”
The labs got a bonus when they discovered that fabricating LIG in oxygen increased the number of defects – 5- and 7-atom rings – in the graphene flakes, improving its capacitance and its performance when used as an electrode material for microsupercapacitors.
Changes in the chemical content of the gas and even changes in the direction of the laser raster pattern altered the material, leading the researchers to believe LIG’s hydrophobic or –philic properties could be tuned.
They also discovered when they scraped graphene off of a hydrophilic sheet of polymer and turned it into a film, the result was hydrophobic instead. “That leads us to believe the surface orientation of LIG’s flakes have a lot to do with how it reacts with water,” Tour said. “If the edges are more exposed, it appears to be hydrophilic; if the basal planes are more exposed, their hydrophobic properties take over.”
A custom chamber built by researchers at Rice University allowed them to refine their process for creating laser-induced graphene. (Image: Tour Group)
What makes a material “super” in either direction is the angle at which it encounters water. A material with a contact angle of 0 degrees is considered superhydrophilic. In this case, water would lay on the material in a puddle. If the angle is 150 degrees or more, that’s superhydrophobic; the angle is determined by how much the water beads. (An angle of 180 degrees would be a sphere sitting perfectly on top of LIG.)
A water droplet bounces on the surface of laser-induced graphene with a sulfur and fluorine gas in the chamber. (Video: Tour Group)
The discovery that surface type and chemistry affect LIG should also allow some leeway in adjusting the material’s properties, Tour said. In fact, when they used a sulfur/fluorine gas to make it, they raised LIG’s superhydrophobicity to 160 degrees.