E-Jet nanoprinting creates high-performance piezoceramic sensors with 40 nm resolution

A joint team from Ningbo University and The University of Hong Kong has pushed piezoceramic printing into territory that hobby-scale additive manufacturing has rarely touched, using electrohydrodynamic jet nanoprinting to build lead zirconate titanate structures at about 40 nm resolution with an aspect ratio of roughly 400. The work, published in the International Journal of Extreme Manufacturing on March 27, 2025, turns a material long valued in sensors and actuators into something far more delicate and far more printable.

What makes the result stand out is the odd combination of scale and performance. The researchers used a 100 m-sized nozzle to directly produce true nanoscale PZT structures, yet the printed parts showed a well-developed perovskite crystal morphology, large elastic strain of about 13%, and a piezoelectric coefficient of d31 at roughly 236.5 × 10^-12 C/N. In plain maker terms, this is the kind of figure that matters because it suggests the material can flex and still convert mechanical motion into electrical signal with real strength.

That matters for a class of projects that usually runs into a wall: flexible sensors, micro energy harvesters, and compact actuators that need complex 3D geometry without the defects that have plagued older printing methods. The paper argues that conventional 3D printing has generally been stuck at micron-scale resolution, which has made it hard to build dense, intricate piezoceramic architectures that still perform like serious devices. This study is a direct challenge to that limit.

The demonstration piece was a bioinspired PZT air-flow sensor that detected ultra-slow airflow as low as 0.02 m/s. That is the sort of sensitivity that points beyond a lab curiosity and toward practical sensing parts for wearables, environmental monitors, and self-powered electronics, especially where tiny vibrations or faint airflow need to be captured and turned into a readable signal.

The author list, which includes Kai Li, Sufeng Fan, Xiaoying Wang, Yang Lu, Bingyan Liu, Shirong Liu, Vasanthan Devaraj, Yuxiang Yin, Yueqi Zhang, Jingui Ai, Yaochen Han and Jicheng Feng, spans Ningbo University, its School of Civil & Environmental Engineering and Geography, The University of Hong Kong, China University of Mining and Technology and Zhengzhou University. Kai Li said the goal was to break the nanoscale-resolution barrier while preserving PZT’s piezoelectric properties, and this paper gets unusually close to that target.

For makers watching printable electronics, this is still years away from ordinary hobby adoption, but it reads as an early signal rather than a dead-end experiment. If E-Jet nanoprinting keeps moving, the next wave of printed sensors and energy-harvesting parts may look less like chunky proof-of-concepts and more like flexible, high-performance components that actually behave like electronics you would want to build into real devices.