Reusable patterned membranes for making SWCNT films in custom shapes for optics and sensors.

What is it about?

Single-walled carbon nanotube (SWCNT) thin films offer high modulation depth, durability, and scalability. However, achieving controlled spatial patterning remains difficult. We present a waste-free, one-step, dry approach combining aerosol chemical vapor deposition (CVD) with selective flow-path reorganization via stencil pressing (imprinting). Two variants are introduced: stencil-free imprinting (pressure >200 MPa) yields high reproducibility for features >200 μm and nearly eliminates nanotubes in clogged regions. Stencil-supported imprinting (100 MPa) retains the stencil, achieving complete nanotube absence even near laser resolution. Using this method, we fabricate strain sensors with a response at least three times higher than reported values, and a mechanically tunable THz spiral zone plate that reliably shifts focal distance by 44% under 12% strain. This work opens new avenues for patterned SWCNTs in optics and electronics.

Featured Image

Photo by JJ Ying on Unsplash

Photo by JJ Ying on Unsplash

Why is it important?

It enables high-performance, mechanically tunable THz devices and ultrasensitive strain sensors, overcoming a key patterning limitation for scalable carbon nanotube optics.