Water-based and biocompatible 2D crystal inks for all-inkjet-printed heterostructures

Abstract

Exploiting the properties of two-dimensional crystals requires a mass production method able to produce heterostructures of arbitrary complexity on any substrate. Solution processing of graphene allows simple and low-cost techniques such as inkjet printing to be used for device fabrication. However, the available printable formulations are still far from ideal as they are either based on toxic solvents, have low concentration, or require time-consuming and expensive processing. In addition, none is suitable for thin-film heterostructure fabrication due to the re-mixing of different two-dimensional crystals leading to uncontrolled interfaces and poor device performance. Here, we show a general approach to achieve inkjet-printable, water-based, two-dimensional crystal formulations, which also provide optimal film formation for multi-stack fabrication. We show examples of all-inkjet-printed heterostructures, such as large-area arrays of photosensors on plastic and paper and programmable logic memory devices. Finally, in vitro dose-escalation cytotoxicity assays confirm the biocompatibility of the inks, extending their possible use to biomedical applications.

Production of monolayer-rich gold-decorated 2H–WS2 nanosheets by defect engineering

“…12,13 In LPE, the semiconducting 2H-polytype is retained which is interesting for optoelectronics, whereas chemical exfoliation (CE) (often achieved after intercalation with n-BuLi) 14 yields the metastable metallic 1T-polytype. While many proof of concept applications have been recently demonstrated (from printed photodetectors and transistors to catalyst electrodes or batteries), 3,4,6,11,15,16 significant bottlenecks remain that impede the realization of real life applications.…”

Aqueous dispersions of nanostructures formed through the self-assembly of iminolipids with exchangeable hydrophobic termini

“…27 Lipids 3r, 3s and DDAB (0.5 mg/mL lipid, pyrene concentrations of 0.8 mM and 0.7 mM for 3r and 3s respectively) were sonicated in water for 72 h with graphite (3 mg/mL) using a bath sonicator (600 W). The resultant dispersions were centrifuged at 3500 rpm (903 G) for 20 min, then the supernatant collected and analyzed.…”

In Situ Synthesis and Electrophoretic Deposition of NiO/Ni Core-Shell Nanoparticles and Its Application as Pseudocapacitor

“…This is a key step to break down weak agglomerates, stabilize and facilitate powders mixing, removing heterogeneities and defects in the shaped material which avoid the degradation of relevant properties. Moreover, it is critical to fit processing additives to modify suspensions properties apart from dispersion, such as the viscosity, flux, etc., adapting their rheological behavior to the forming technique [17,18], and also they are relevant to control the particles assembly [19].…”