A general gelation strategy for 1D nanowires: dynamically stable functional gels for 3D printing flexible electronics

Abstract

A versatile gelation strategy was developed to obtain thixotropic nanowire gels for 3D printing of flexible electronics.

3D‐Printed Stretchable Micro‐Supercapacitor with Remarkable Areal Performance

“…The fabrication process of the intrinsically stretchable MSC, as illustrated in Figure 1 , begins with the formulation of viscous pseudoplastic MXene‐based electrode ink for extrusion‐based 3D printing according to the modified nanocomposite gelation strategies . Hydrophilic and delaminated Ti 3 C 2 T x MXene nanosheets were first prepared by selectively etching bulk Ti 3 AlC 2 MAX followed by exfoliation in distilled water .…”

“…A dilute and uniformly dispersed mixture of MXene, AgNWs, MnONWs, and C60 was then prepared through mild ultrasonication, followed by vacuum filtration to obtain a MXene‐AgNW‐MnONW‐C60 hydrogel. After redispersion in distilled water, the 1D AgNWs and MnONWs can associate with the flexible and hydrophilic 2D MXene nanosheets to form a dynamic cross‐linked 3D network . This network facilitates the gelation of the printable nanocomposite ink without the need of any organic dispersing and rheological agents .…”

“…This shear thinning behavior is desirable in inks for extrusion because it allows inks to be extruded continuously. While the pure MXene ink also exhibited shear thinning, the addition of AgNWs and MnONWs increased the viscosity of the resulting inks (Figure S2a, Supporting Information) due to the physical cross‐linked network formed between 1D nanowires and 2D MXene nanosheets …”

Hydrous RuO2‐Decorated MXene Coordinating with Silver Nanowire Inks Enabling Fully Printed Micro‐Supercapacitors with Extraordinary Volumetric Performance

“…This deposition process was enabled by the presence of hydrophilic oxygencontaining functional groups on the MXene surface which serve as a surfactant to ruthenium chloride, allowing the positively charged Ru 3+ to adsorb onto the negatively charged MXene surface through electrostatic interactions. [33,34] The mass ratio between RuO 2 ·xH 2 O@MXene and AgNWs was optimized to be 0.75:1 (as detailed in the Experimental Section and the Supporting Information) and is subsequently denoted as R@M-A 0.75:1 . These RuO 2 nanoparticles were anchored in situ onto the surface of the MXene via strong chemical interactions between the residual oxygen-containing functional groups on the MXene and hydrous RuO 2 or through van der Waals interactions between the MXene and the nanoparticles.…”

“…[33,34] In detail, the RuO 2 ·xH 2 O@MXene and AgNW aqueous dispersions were mixed and uniformly dispersed through www.advenergymat.de www.advancedsciencenews.com intermittent strong agitation and ultrasonic treatment for 5 min. [33,34] In detail, the RuO 2 ·xH 2 O@MXene and AgNW aqueous dispersions were mixed and uniformly dispersed through www.advenergymat.de www.advancedsciencenews.com intermittent strong agitation and ultrasonic treatment for 5 min.…”