10 times stronger than Kevlar: Amorphous silicon carbide could revolutionize materials science

For decades, thin film materials have been used to realize highly sensitive mechanical resonators under high tensile loads. Although great progress has been made in realizing low-dissipation mechanical sensors utilizing high tensile stress, the performance of even the best strategies is limited by the tensile rupture strength of the resonator material.

Researchers at TU Delft, led by Assistant Professor Richard Norte, have introduced an extraordinary new material that promises to impact the world of materials science: amorphous silicon carbide (a-SiC).

Not only is this material extremely strong, it also has mechanical properties that are critical for microchip vibration isolation. Amorphous silicon carbide is therefore particularly suitable for making ultra-sensitive microchip sensors.

The range of potential applications is very wide. From ultra-sensitive microchip sensors and advanced solar cells to pioneering space exploration and DNA sequencing technology. The material's strength advantages combined with its scalability make it incredibly promising.

"To better understand this key property of being amorphous, think of most materials as being made up of atoms arranged in a regular pattern, like an intricate Lego tower," Knott explains. "These materials are called 'crystalline' materials, such as diamond. Its carbon atoms are completely However, amorphous materials are like randomly stacked Lego bricks, but contrary to expectations, this randomness does not lead to fragility. In fact, amorphous silicon carbide demonstrates the strength that this randomness creates."

The new material has a tensile strength of 10 gigapascals (GPa). "To understand what this means, imagine trying to stretch a piece of tape until it breaks," Knott said. "Now, if you wanted to simulate the equivalent of 10 GPa of tensile stress, you would need to hang about 10 medium-sized cars end-to-end on the tape before it breaks."

nanospring

The researchers used an innovative method to test the material's tensile strength. While traditional methods can cause errors due to the way the material is held in place, they used microchip technology. By growing a thin film of amorphous silicon carbide on a silicon substrate and suspending it, they exploited the geometry of the nanorings to induce high tensile forces. By making many of these structures and increasing the tensile force, they carefully observed the breaking point. This microchip-based approach not only ensures unprecedented precision but also paves the way for future materials testing.

Why do we need to care about nanorings? Nanorings are the most basic building blocks and the basis for building more complex suspended structures. Demonstrating high yield strength in nanorings is demonstrating strength in its most basic form.

From micro to macro

What makes this material unique is its scalability. Graphene, made up of a single layer of carbon atoms, is known for its amazing strength but is difficult to produce in large quantities. Although diamonds are incredibly strong, they are rare in nature and expensive to synthesize. Amorphous silicon carbide, on the other hand, can be produced at wafer scale, providing this incredibly strong bulk material.

"With the advent of amorphous silicon carbide, we stand on the threshold of microchip research full of technological possibilities," Knott concluded.

This strong, thin-film material has great potential for applications in nanomechanical sensors, solar cells, biological applications, space exploration, and other areas where strength and stability are required in dynamic environments. The findings of this study open up new possibilities for the use of amorphous thin film materials in high-performance applications.

Compiled source: ScitechDaily