Achievements
Achievement
The pace of technological obsolescence in electronic devices is staggering, and the resulting e-waste problem is growing increasingly severe. Conventional environmental monitoring sensors—particularly those for temperature and humidity—often rely on non‑degradable plastic substrates (such as PET or PE) and toxic metal materials. Not only are these components difficult to recycle, but their degradation can release harmful microplastic particles, contaminating the environment. Is it possible to develop sensors that are both high‑performance and environmentally friendly—perhaps even nearly “invisible”? A recent study published in Small Methods offers an exciting answer: by leveraging aerosol jet printing (AJP), researchers have successfully fabricated a highly transparent, ultra‑compact, and ultra‑low‑material‑consumption integrated temperature–humidity sensor on a biodegradable cellulose substrate. This could herald the dawn of next‑generation green electronics.
When you casually discard an electronic sensor, you may not realize that it could persist in the soil for centuries, becoming “electronic waste” that pollutes the environment. Today, the global Internet of Things is experiencing explosive growth: by 2025, more than 30 billion devices are expected to be deployed, bringing with them tens of millions of tons of electronic waste annually and depleting critical mineral resources. However, a groundbreaking study published in npj Advanced Manufacturing has opened new avenues for eco‑friendly electronics: a research team from Northwestern University and other institutions has successfully developed fully biodegradable printed electronic sensors using aerosol jet printing. From the substrate to the ink, everything is derived entirely from biomass, delivering exceptional performance while naturally breaking down at the end of its lifecycle—truly embodying the principle of “from nature, back to nature.”
Have you ever imagined a future where smartphones can fold like paper and smartwatches are printed directly onto clothing? All of this would be impossible without graphene—a two-dimensional carbon material hailed as the “king of materials.” However, conventional graphene printing inks typically rely on surfactants or polymers as dispersants; these additives must be removed through high-temperature post‑processing, limiting their use on heat‑sensitive substrates and hindering the development of diverse flexible electronic devices. A recent breakthrough: scientists from China and Israel have developed a new type of graphene ink. By using polypropylene carbonate (PPC) as a dispersant and pairing it with low‑surface‑tension solvents, they can print high‑performance micro‑supercapacitors on paper with only a mild 220°C annealing step. Coupled with aerosol jet printing (AJP) technology, this approach makes it easy to bring intricate circuits to life right on paper.
With the rapid advancement of microelectronic devices and wearable technologies, on-chip energy storage components must balance high energy density with compact form factors. Micro-supercapacitors (MSCs) have emerged as a leading candidate; however, conventional planar electrode architectures suffer from low active-material loading and long ion‑transport pathways. Two-dimensional Ti₃C₂Tₓ MXene materials, with their high specific surface area and excellent electrochemical performance, are an ideal choice for fabricating high‑performance MSCs. Nevertheless, their 3D assembly faces three major challenges: first, MXene nanosheets are held together only by weak van der Waals forces and hydrogen bonds, lacking strong interfacial interactions and thus failing to maintain a stable 3D architecture; second, existing methods rely on binders and other additives, which can occupy active sites and degrade device performance; third, traditional 3D‑printing techniques exhibit low resolution (typically >40 μm) and low aspect ratios (generally <0.3), making it difficult to fabricate high‑fidelity, complex 3D microstructures. To address these bottlenecks, a team at Carnegie Mellon University has developed an additive‑free aerosol jet printing (AJP) technique that enables the 3D self‑supporting assembly of MXene nanosheets. The resulting work was published in the journal Small.
With the rapid advancement of technology, smart wearable devices are becoming increasingly ubiquitous. Our daily lives, sports activities, health monitoring, and even personal safety all rely on these “smart garments.” However, to achieve truly “intimate” smart functionality, one key challenge is solving the energy‑supply problem: conventional batteries are bulky, rigid, and difficult to integrate into soft textile materials, while their lifespan, charge‑discharge performance, and wash durability all pose significant hurdles. Consequently, developing lightweight, flexible, washable energy storage devices with superior performance has emerged as a crucial breakthrough for advancing the smart‑wearable industry. Supercapacitors, with their high power density, long cycle life, and rapid charge‑discharge capabilities, stand out as an ideal choice. Integrating supercapacitors directly into textiles has thus become the industry’s ultimate goal. Today, we introduce an exciting technological breakthrough: using aerosol jet printing (AJP) to directly “print” high‑performance MXene materials onto fabrics, creating miniature supercapacitors that are both soft and washable, while delivering exceptional performance—ushering in a new era for wearable electronics.
When you’re exercising with a smartwatch, do you often worry about the battery suddenly running out? And as IoT sensors become ubiquitous in homes and cities, how can we provide these tiny devices with a long-lasting, reliable power supply? With the explosive growth of portable and wearable electronics and IoT technologies, the limitations of traditional energy-storage devices—such as miniaturization, high integration, and flexibility—are becoming increasingly apparent. Recently, research teams from institutions including the Guangdong–Israel Institute of Technology and the Southern University of Science and Technology published a groundbreaking achievement in ACS Applied Energy Materials. Using aerosol-jet 3D printing technology, they successfully fabricated an array of graphene‑based hollow‑pillar electrode (HPE) microsupercapacitors (MSCs). These devices not only deliver a high output voltage of 10 V but also boast an exceptionally high integration density of 102 cm⁻², while maintaining excellent bending stability, thus opening up new avenues for the development of miniature energy‑storage devices.
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